1 /*
2 * Copyright (c) 1997, 2021, 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.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/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/method.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "prims/jvm_misc.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiThreadState.hpp"
69 #include "prims/stackwalk.hpp"
70 #include "runtime/arguments.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/globals_extension.hpp"
73 #include "runtime/handles.inline.hpp"
74 #include "runtime/init.hpp"
75 #include "runtime/interfaceSupport.inline.hpp"
76 #include "runtime/deoptimization.hpp"
77 #include "runtime/handshake.hpp"
78 #include "runtime/java.hpp"
79 #include "runtime/javaCalls.hpp"
80 #include "runtime/jfieldIDWorkaround.hpp"
81 #include "runtime/jniHandles.inline.hpp"
82 #include "runtime/os.inline.hpp"
83 #include "runtime/osThread.hpp"
84 #include "runtime/perfData.hpp"
85 #include "runtime/reflection.hpp"
86 #include "runtime/synchronizer.hpp"
87 #include "runtime/thread.inline.hpp"
88 #include "runtime/threadSMR.hpp"
89 #include "runtime/vframe.inline.hpp"
90 #include "runtime/vmOperations.hpp"
91 #include "runtime/vm_version.hpp"
92 #include "services/attachListener.hpp"
93 #include "services/management.hpp"
94 #include "services/threadService.hpp"
95 #include "utilities/copy.hpp"
96 #include "utilities/defaultStream.hpp"
97 #include "utilities/dtrace.hpp"
98 #include "utilities/events.hpp"
99 #include "utilities/macros.hpp"
100 #include "utilities/utf8.hpp"
101 #if INCLUDE_CDS
102 #include "classfile/systemDictionaryShared.hpp"
103 #endif
104 #if INCLUDE_JFR
105 #include "jfr/jfr.hpp"
106 #endif
107 #if INCLUDE_MANAGEMENT
108 #include "services/finalizerService.hpp"
109 #endif
110
111 #include <errno.h>
112
113 /*
114 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
115 such ctors and calls MUST NOT come between an oop declaration/init and its
116 usage because if objects are move this may cause various memory stomps, bus
117 errors and segfaults. Here is a cookbook for causing so called "naked oop
118 failures":
119
120 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
121 // Object address to be held directly in mirror & not visible to GC
122 oop mirror = JNIHandles::resolve_non_null(ofClass);
123
124 // If this ctor can hit a safepoint, moving objects around, then
125 ComplexConstructor foo;
126
127 // Boom! mirror may point to JUNK instead of the intended object
128 (some dereference of mirror)
129
130 // Here's another call that may block for GC, making mirror stale
131 MutexLocker ml(some_lock);
132
133 // And here's an initializer that can result in a stale oop
134 // all in one step.
135 oop o = call_that_can_throw_exception(TRAPS);
136
137
138 The solution is to keep the oop declaration BELOW the ctor or function
139 call that might cause a GC, do another resolve to reassign the oop, or
140 consider use of a Handle instead of an oop so there is immunity from object
141 motion. But note that the "QUICK" entries below do not have a handlemark
142 and thus can only support use of handles passed in.
143 */
144
145 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
146 ResourceMark rm;
147 int line_number = -1;
148 const char * source_file = NULL;
149 const char * trace = "explicit";
150 InstanceKlass* caller = NULL;
151 JavaThread* jthread = THREAD;
152 if (jthread->has_last_Java_frame()) {
153 vframeStream vfst(jthread);
154
155 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
156 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
157 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
158 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
159 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
160
161 Method* last_caller = NULL;
162
163 while (!vfst.at_end()) {
164 Method* m = vfst.method();
165 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
166 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
167 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
168 break;
169 }
170 last_caller = m;
171 vfst.next();
172 }
173 // if this is called from Class.forName0 and that is called from Class.forName,
174 // then print the caller of Class.forName. If this is Class.loadClass, then print
175 // that caller, otherwise keep quiet since this should be picked up elsewhere.
176 bool found_it = false;
177 if (!vfst.at_end() &&
178 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
179 vfst.method()->name() == vmSymbols::forName0_name()) {
180 vfst.next();
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName_name()) {
184 vfst.next();
185 found_it = true;
186 }
187 } else if (last_caller != NULL &&
188 last_caller->method_holder()->name() ==
189 vmSymbols::java_lang_ClassLoader() &&
190 last_caller->name() == vmSymbols::loadClass_name()) {
191 found_it = true;
192 } else if (!vfst.at_end()) {
193 if (vfst.method()->is_native()) {
194 // JNI call
195 found_it = true;
196 }
197 }
198 if (found_it && !vfst.at_end()) {
199 // found the caller
200 caller = vfst.method()->method_holder();
201 line_number = vfst.method()->line_number_from_bci(vfst.bci());
202 if (line_number == -1) {
203 // show method name if it's a native method
204 trace = vfst.method()->name_and_sig_as_C_string();
205 }
206 Symbol* s = caller->source_file_name();
207 if (s != NULL) {
208 source_file = s->as_C_string();
209 }
210 }
211 }
212 if (caller != NULL) {
213 if (to_class != caller) {
214 const char * from = caller->external_name();
215 const char * to = to_class->external_name();
216 // print in a single call to reduce interleaving between threads
217 if (source_file != NULL) {
218 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
219 } else {
220 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
221 }
222 }
223 }
224 }
225
226 void trace_class_resolution(Klass* to_class) {
227 EXCEPTION_MARK;
228 trace_class_resolution_impl(to_class, THREAD);
229 if (HAS_PENDING_EXCEPTION) {
230 CLEAR_PENDING_EXCEPTION;
231 }
232 }
233
234 // java.lang.System //////////////////////////////////////////////////////////////////////
235
236
237 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
238 return os::javaTimeMillis();
239 JVM_END
240
241 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
242 return os::javaTimeNanos();
243 JVM_END
244
245 // The function below is actually exposed by jdk.internal.misc.VM and not
246 // java.lang.System, but we choose to keep it here so that it stays next
247 // to JVM_CurrentTimeMillis and JVM_NanoTime
248
249 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
250 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
251
252 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
253 jlong seconds;
254 jlong nanos;
255
256 os::javaTimeSystemUTC(seconds, nanos);
257
258 // We're going to verify that the result can fit in a long.
259 // For that we need the difference in seconds between 'seconds'
260 // and 'offset_secs' to be such that:
261 // |seconds - offset_secs| < (2^63/10^9)
262 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
263 // which makes |seconds - offset_secs| < 2^33
264 // and we will prefer +/- 2^32 as the maximum acceptable diff
265 // as 2^32 has a more natural feel than 2^33...
266 //
267 // So if |seconds - offset_secs| >= 2^32 - we return a special
268 // sentinel value (-1) which the caller should take as an
269 // exception value indicating that the offset given to us is
270 // too far from range of the current time - leading to too big
271 // a nano adjustment. The caller is expected to recover by
272 // computing a more accurate offset and calling this method
273 // again. (For the record 2^32 secs is ~136 years, so that
274 // should rarely happen)
275 //
276 jlong diff = seconds - offset_secs;
277 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
278 return -1; // sentinel value: the offset is too far off the target
279 }
280
281 // return the adjustment. If you compute a time by adding
282 // this number of nanoseconds along with the number of seconds
283 // in the offset you should get the current UTC time.
284 return (diff * (jlong)1000000000) + nanos;
285 JVM_END
286
287 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
288 jobject dst, jint dst_pos, jint length))
289 // Check if we have null pointers
290 if (src == NULL || dst == NULL) {
291 THROW(vmSymbols::java_lang_NullPointerException());
292 }
293 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
294 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
295 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
296 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
297 // Do copy
298 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
299 JVM_END
300
301
302 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
303 JavaValue r(T_OBJECT);
304 // public synchronized Object put(Object key, Object value);
305 HandleMark hm(THREAD);
306 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
307 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
308 JavaCalls::call_virtual(&r,
309 props,
310 vmClasses::Properties_klass(),
311 vmSymbols::put_name(),
312 vmSymbols::object_object_object_signature(),
313 key_str,
314 value_str,
315 THREAD);
316 }
317
318
319 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
320
321 /*
322 * Return all of the system properties in a Java String array with alternating
323 * names and values from the jvm SystemProperty.
324 * Which includes some internal and all commandline -D defined properties.
325 */
326 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
327 ResourceMark rm(THREAD);
328 HandleMark hm(THREAD);
329 int ndx = 0;
330 int fixedCount = 2;
331
332 SystemProperty* p = Arguments::system_properties();
333 int count = Arguments::PropertyList_count(p);
334
335 // Allocate result String array
336 InstanceKlass* ik = vmClasses::String_klass();
337 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
338 objArrayHandle result_h(THREAD, r);
339
340 while (p != NULL) {
341 const char * key = p->key();
342 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
343 const char * value = p->value();
344 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
345 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
346 result_h->obj_at_put(ndx * 2, key_str());
347 result_h->obj_at_put(ndx * 2 + 1, value_str());
348 ndx++;
349 }
350 p = p->next();
351 }
352
353 // Convert the -XX:MaxDirectMemorySize= command line flag
354 // to the sun.nio.MaxDirectMemorySize property.
355 // Do this after setting user properties to prevent people
356 // from setting the value with a -D option, as requested.
357 // Leave empty if not supplied
358 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
359 char as_chars[256];
360 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
361 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
362 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
363 result_h->obj_at_put(ndx * 2, key_str());
364 result_h->obj_at_put(ndx * 2 + 1, value_str());
365 ndx++;
366 }
367
368 // JVM monitoring and management support
369 // Add the sun.management.compiler property for the compiler's name
370 {
371 #undef CSIZE
372 #if defined(_LP64) || defined(_WIN64)
373 #define CSIZE "64-Bit "
374 #else
375 #define CSIZE
376 #endif // 64bit
377
378 #if COMPILER1_AND_COMPILER2
379 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
380 #else
381 #if defined(COMPILER1)
382 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
383 #elif defined(COMPILER2)
384 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
385 #elif INCLUDE_JVMCI
386 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
387 #else
388 const char* compiler_name = "";
389 #endif // compilers
390 #endif // COMPILER1_AND_COMPILER2
391
392 if (*compiler_name != '\0' &&
393 (Arguments::mode() != Arguments::_int)) {
394 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
395 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
396 result_h->obj_at_put(ndx * 2, key_str());
397 result_h->obj_at_put(ndx * 2 + 1, value_str());
398 ndx++;
399 }
400 }
401
402 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
403 JVM_END
404
405
406 /*
407 * Return the temporary directory that the VM uses for the attach
408 * and perf data files.
409 *
410 * It is important that this directory is well-known and the
411 * same for all VM instances. It cannot be affected by configuration
412 * variables such as java.io.tmpdir.
413 */
414 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
415 HandleMark hm(THREAD);
416 const char* temp_dir = os::get_temp_directory();
417 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
418 return (jstring) JNIHandles::make_local(THREAD, h());
419 JVM_END
420
421
422 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
423
424 extern volatile jint vm_created;
425
426 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
427 #if INCLUDE_CDS
428 // Link all classes for dynamic CDS dumping before vm exit.
429 if (DynamicArchive::should_dump_at_vm_exit()) {
430 DynamicArchive::prepare_for_dump_at_exit();
431 }
432 #endif
433 EventShutdown event;
434 if (event.should_commit()) {
435 event.set_reason("Shutdown requested from Java");
436 event.commit();
437 }
438 JVM_END
439
440
441 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
442 before_exit(thread);
443 vm_exit(code);
444 JVM_END
445
446
447 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
448 if (!DisableExplicitGC) {
449 EventSystemGC event;
450 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
451 Universe::heap()->collect(GCCause::_java_lang_system_gc);
452 event.commit();
453 }
454 JVM_END
455
456
457 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
458 return Universe::heap()->millis_since_last_whole_heap_examined();
459 JVM_END
460
461
462 static inline jlong convert_size_t_to_jlong(size_t val) {
463 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
464 NOT_LP64 (return (jlong)val;)
465 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
466 }
467
468 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
469 size_t n = Universe::heap()->capacity();
470 return convert_size_t_to_jlong(n);
471 JVM_END
472
473
474 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
475 size_t n = Universe::heap()->unused();
476 return convert_size_t_to_jlong(n);
477 JVM_END
478
479
480 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
481 size_t n = Universe::heap()->max_capacity();
482 return convert_size_t_to_jlong(n);
483 JVM_END
484
485
486 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
487 return os::active_processor_count();
488 JVM_END
489
490 JVM_ENTRY_NO_ENV(jboolean, JVM_IsUseContainerSupport(void))
491 #ifdef LINUX
492 if (UseContainerSupport) {
493 return JNI_TRUE;
494 }
495 #endif
496 return JNI_FALSE;
497 JVM_END
498
499 // java.lang.Throwable //////////////////////////////////////////////////////
500
501 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
502 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
503 java_lang_Throwable::fill_in_stack_trace(exception);
504 JVM_END
505
506 // java.lang.NullPointerException ///////////////////////////////////////////
507
508 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
509 if (!ShowCodeDetailsInExceptionMessages) return NULL;
510
511 oop exc = JNIHandles::resolve_non_null(throwable);
512
513 Method* method;
514 int bci;
515 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
516 return NULL;
517 }
518 if (method->is_native()) {
519 return NULL;
520 }
521
522 stringStream ss;
523 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
524 if (ok) {
525 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
526 return (jstring) JNIHandles::make_local(THREAD, result);
527 } else {
528 return NULL;
529 }
530 JVM_END
531
532 // java.lang.StackTraceElement //////////////////////////////////////////////
533
534
535 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
536 Handle exception(THREAD, JNIHandles::resolve(throwable));
537 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
538 objArrayHandle stack_trace(THREAD, st);
539 // Fill in the allocated stack trace
540 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
541 JVM_END
542
543
544 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
545 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
546 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
547 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
548 JVM_END
549
550
551 // java.lang.StackWalker //////////////////////////////////////////////////////
552
553
554 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
555 jint skip_frames, jint frame_count, jint start_index,
556 jobjectArray frames))
557 if (!thread->has_last_Java_frame()) {
558 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
559 }
560
561 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
562
563 // frames array is a Class<?>[] array when only getting caller reference,
564 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
565 // be null.
566 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
567 objArrayHandle frames_array_h(THREAD, fa);
568
569 int limit = start_index + frame_count;
570 if (frames_array_h->length() < limit) {
571 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
572 }
573
574 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
575 start_index, frames_array_h, CHECK_NULL);
576 return JNIHandles::make_local(THREAD, result);
577 JVM_END
578
579
580 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
581 jint frame_count, jint start_index,
582 jobjectArray frames))
583 // frames array is a Class<?>[] array when only getting caller reference,
584 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
585 // be null.
586 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
587 objArrayHandle frames_array_h(THREAD, fa);
588
589 int limit = start_index+frame_count;
590 if (frames_array_h->length() < limit) {
591 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
592 }
593
594 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
595 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
596 start_index, frames_array_h, THREAD);
597 JVM_END
598
599 // java.lang.Object ///////////////////////////////////////////////
600
601
602 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
603 // as implemented in the classic virtual machine; return 0 if object is NULL
604 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
605 JVM_END
606
607
608 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
609 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
610 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
611 if (JvmtiExport::should_post_monitor_wait()) {
612 JvmtiExport::post_monitor_wait(thread, obj(), ms);
613
614 // The current thread already owns the monitor and it has not yet
615 // been added to the wait queue so the current thread cannot be
616 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
617 // event handler cannot accidentally consume an unpark() meant for
618 // the ParkEvent associated with this ObjectMonitor.
619 }
620 ObjectSynchronizer::wait(obj, ms, CHECK);
621 JVM_END
622
623
624 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
625 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
626 ObjectSynchronizer::notify(obj, CHECK);
627 JVM_END
628
629
630 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
631 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
632 ObjectSynchronizer::notifyall(obj, CHECK);
633 JVM_END
634
635
636 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
638 Klass* klass = obj->klass();
639 JvmtiVMObjectAllocEventCollector oam;
640
641 #ifdef ASSERT
642 // Just checking that the cloneable flag is set correct
643 if (obj->is_array()) {
644 guarantee(klass->is_cloneable(), "all arrays are cloneable");
645 } else {
646 guarantee(obj->is_instance(), "should be instanceOop");
647 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
648 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
649 }
650 #endif
651
652 // Check if class of obj supports the Cloneable interface.
653 // All arrays are considered to be cloneable (See JLS 20.1.5).
654 // All j.l.r.Reference classes are considered non-cloneable.
655 if (!klass->is_cloneable() ||
656 (klass->is_instance_klass() &&
657 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
658 ResourceMark rm(THREAD);
659 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
660 }
661
662 // Make shallow object copy
663 const size_t size = obj->size();
664 oop new_obj_oop = NULL;
665 if (obj->is_array()) {
666 const int length = ((arrayOop)obj())->length();
667 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
668 /* do_zero */ true, CHECK_NULL);
669 } else {
670 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
671 }
672
673 HeapAccess<>::clone(obj(), new_obj_oop, size);
674
675 Handle new_obj(THREAD, new_obj_oop);
676 // Caution: this involves a java upcall, so the clone should be
677 // "gc-robust" by this stage.
678 if (klass->has_finalizer()) {
679 assert(obj->is_instance(), "should be instanceOop");
680 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
681 new_obj = Handle(THREAD, new_obj_oop);
682 }
683
684 return JNIHandles::make_local(THREAD, new_obj());
685 JVM_END
686
687 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
688
689 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
690 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
691 JVM_END
692
693 // java.io.File ///////////////////////////////////////////////////////////////
694
695 JVM_LEAF(char*, JVM_NativePath(char* path))
696 return os::native_path(path);
697 JVM_END
698
699
700 // Misc. class handling ///////////////////////////////////////////////////////////
701
702
703 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
704 // Getting the class of the caller frame.
705 //
706 // The call stack at this point looks something like this:
707 //
708 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
709 // [1] [ @CallerSensitive API.method ]
710 // [.] [ (skipped intermediate frames) ]
711 // [n] [ caller ]
712 vframeStream vfst(thread);
713 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
714 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
715 Method* m = vfst.method();
716 assert(m != NULL, "sanity");
717 switch (n) {
718 case 0:
719 // This must only be called from Reflection.getCallerClass
720 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
721 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
722 }
723 // fall-through
724 case 1:
725 // Frame 0 and 1 must be caller sensitive.
726 if (!m->caller_sensitive()) {
727 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
728 }
729 break;
730 default:
731 if (!m->is_ignored_by_security_stack_walk()) {
732 // We have reached the desired frame; return the holder class.
733 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
734 }
735 break;
736 }
737 }
738 return NULL;
739 JVM_END
740
741
742 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
743 oop mirror = NULL;
744 BasicType t = name2type(utf);
745 if (t != T_ILLEGAL && !is_reference_type(t)) {
746 mirror = Universe::java_mirror(t);
747 }
748 if (mirror == NULL) {
749 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
750 } else {
751 return (jclass) JNIHandles::make_local(THREAD, mirror);
752 }
753 JVM_END
754
755
756 // Returns a class loaded by the bootstrap class loader; or null
757 // if not found. ClassNotFoundException is not thrown.
758 // FindClassFromBootLoader is exported to the launcher for windows.
759 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
760 const char* name))
761 // Java libraries should ensure that name is never null or illegal.
762 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
763 // It's impossible to create this class; the name cannot fit
764 // into the constant pool.
765 return NULL;
766 }
767 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
768
769 TempNewSymbol h_name = SymbolTable::new_symbol(name);
770 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
771 if (k == NULL) {
772 return NULL;
773 }
774
775 if (log_is_enabled(Debug, class, resolve)) {
776 trace_class_resolution(k);
777 }
778 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
779 JVM_END
780
781 // Find a class with this name in this loader, using the caller's protection domain.
782 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
783 jboolean init, jobject loader,
784 jclass caller))
785 TempNewSymbol h_name =
786 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
787 CHECK_NULL);
788
789 oop loader_oop = JNIHandles::resolve(loader);
790 oop from_class = JNIHandles::resolve(caller);
791 oop protection_domain = NULL;
792 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
793 // NPE. Put it in another way, the bootstrap class loader has all permission and
794 // thus no checkPackageAccess equivalence in the VM class loader.
795 // The caller is also passed as NULL by the java code if there is no security
796 // manager to avoid the performance cost of getting the calling class.
797 if (from_class != NULL && loader_oop != NULL) {
798 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
799 }
800
801 Handle h_loader(THREAD, loader_oop);
802 Handle h_prot(THREAD, protection_domain);
803 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
804 h_prot, false, THREAD);
805
806 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
807 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
808 }
809 return result;
810 JVM_END
811
812 // Currently only called from the old verifier.
813 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
814 jboolean init, jclass from))
815 TempNewSymbol h_name =
816 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
817 CHECK_NULL);
818 oop from_class_oop = JNIHandles::resolve(from);
819 Klass* from_class = (from_class_oop == NULL)
820 ? (Klass*)NULL
821 : java_lang_Class::as_Klass(from_class_oop);
822 oop class_loader = NULL;
823 oop protection_domain = NULL;
824 if (from_class != NULL) {
825 class_loader = from_class->class_loader();
826 protection_domain = from_class->protection_domain();
827 }
828 Handle h_loader(THREAD, class_loader);
829 Handle h_prot (THREAD, protection_domain);
830 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
831 h_prot, true, thread);
832
833 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
834 // this function is generally only used for class loading during verification.
835 ResourceMark rm;
836 oop from_mirror = JNIHandles::resolve_non_null(from);
837 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
838 const char * from_name = from_class->external_name();
839
840 oop mirror = JNIHandles::resolve_non_null(result);
841 Klass* to_class = java_lang_Class::as_Klass(mirror);
842 const char * to = to_class->external_name();
843 log_debug(class, resolve)("%s %s (verification)", from_name, to);
844 }
845
846 return result;
847 JVM_END
848
849 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
850 static jclass jvm_define_class_common(const char *name,
851 jobject loader, const jbyte *buf,
852 jsize len, jobject pd, const char *source,
853 TRAPS) {
854 if (source == NULL) source = "__JVM_DefineClass__";
855
856 JavaThread* jt = THREAD;
857
858 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
859 ClassLoader::perf_define_appclass_selftime(),
860 ClassLoader::perf_define_appclasses(),
861 jt->get_thread_stat()->perf_recursion_counts_addr(),
862 jt->get_thread_stat()->perf_timers_addr(),
863 PerfClassTraceTime::DEFINE_CLASS);
864
865 if (UsePerfData) {
866 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
867 }
868
869 // Class resolution will get the class name from the .class stream if the name is null.
870 TempNewSymbol class_name = name == NULL ? NULL :
871 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
872 CHECK_NULL);
873
874 ResourceMark rm(THREAD);
875 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
876 Handle class_loader (THREAD, JNIHandles::resolve(loader));
877 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
878 ClassLoadInfo cl_info(protection_domain);
879 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
880 class_loader,
881 cl_info,
882 CHECK_NULL);
883
884 if (log_is_enabled(Debug, class, resolve)) {
885 trace_class_resolution(k);
886 }
887
888 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
889 }
890
891 enum {
892 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
893 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
894 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
895 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
896 };
897
898 /*
899 * Define a class with the specified flags that indicates if it's a nestmate,
900 * hidden, or strongly referenced from class loader.
901 */
902 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
903 const jbyte *buf, jsize len, jobject pd,
904 jboolean init, int flags, jobject classData, TRAPS) {
905 ResourceMark rm(THREAD);
906
907 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
908 // Lookup class must be a non-null instance
909 if (lookup_k == NULL) {
910 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
911 }
912 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
913
914 Handle class_loader (THREAD, lookup_k->class_loader());
915
916 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
917 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
918 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
919 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
920
921 InstanceKlass* host_class = NULL;
922 if (is_nestmate) {
923 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
924 }
925
926 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
927 name,
928 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
929 is_nestmate ? host_class->external_name() : "",
930 is_hidden ? "hidden" : "not hidden",
931 is_strong ? "strong" : "weak",
932 vm_annotations ? "with vm annotations" : "without vm annotation");
933
934 if (!is_hidden) {
935 // classData is only applicable for hidden classes
936 if (classData != NULL) {
937 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
938 }
939 if (is_nestmate) {
940 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
941 }
942 if (!is_strong) {
943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
944 }
945 if (vm_annotations) {
946 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
947 }
948 if (flags != STRONG_LOADER_LINK) {
949 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
950 err_msg("invalid flag 0x%x", flags));
951 }
952 }
953
954 // Class resolution will get the class name from the .class stream if the name is null.
955 TempNewSymbol class_name = name == NULL ? NULL :
956 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
957 CHECK_NULL);
958
959 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
960 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
961 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
962
963 InstanceKlass* ik = NULL;
964 if (!is_hidden) {
965 ClassLoadInfo cl_info(protection_domain);
966 ik = SystemDictionary::resolve_from_stream(&st, class_name,
967 class_loader,
968 cl_info,
969 CHECK_NULL);
970
971 if (log_is_enabled(Debug, class, resolve)) {
972 trace_class_resolution(ik);
973 }
974 } else { // hidden
975 Handle classData_h(THREAD, JNIHandles::resolve(classData));
976 ClassLoadInfo cl_info(protection_domain,
977 host_class,
978 classData_h,
979 is_hidden,
980 is_strong,
981 vm_annotations);
982 ik = SystemDictionary::resolve_from_stream(&st, class_name,
983 class_loader,
984 cl_info,
985 CHECK_NULL);
986
987 // The hidden class loader data has been artificially been kept alive to
988 // this point. The mirror and any instances of this class have to keep
989 // it alive afterwards.
990 ik->class_loader_data()->dec_keep_alive();
991
992 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
993 ModuleEntry* module = ik->module();
994 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
995 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
996 module_name,
997 ik->external_name(),
998 host_class->external_name(),
999 ik->is_hidden() ? "is hidden" : "is not hidden");
1000 }
1001 }
1002 assert(Reflection::is_same_class_package(lookup_k, ik),
1003 "lookup class and defined class are in different packages");
1004
1005 if (init) {
1006 ik->initialize(CHECK_NULL);
1007 } else {
1008 ik->link_class(CHECK_NULL);
1009 }
1010
1011 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1012 }
1013
1014 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1015 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1016 JVM_END
1017
1018 /*
1019 * Define a class with the specified lookup class.
1020 * lookup: Lookup class
1021 * name: the name of the class
1022 * buf: class bytes
1023 * len: length of class bytes
1024 * pd: protection domain
1025 * init: initialize the class
1026 * flags: properties of the class
1027 * classData: private static pre-initialized field
1028 */
1029 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1030 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1031
1032 if (lookup == NULL) {
1033 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1034 }
1035
1036 assert(buf != NULL, "buf must not be NULL");
1037
1038 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1039 JVM_END
1040
1041 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1042
1043 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1044 JVM_END
1045
1046 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1047 ResourceMark rm(THREAD);
1048
1049 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1050 char* str = java_lang_String::as_utf8_string(h_name());
1051
1052 // Sanity check, don't expect null
1053 if (str == NULL) return NULL;
1054
1055 // Internalize the string, converting '.' to '/' in string.
1056 char* p = (char*)str;
1057 while (*p != '\0') {
1058 if (*p == '.') {
1059 *p = '/';
1060 }
1061 p++;
1062 }
1063
1064 const int str_len = (int)(p - str);
1065 if (str_len > Symbol::max_length()) {
1066 // It's impossible to create this class; the name cannot fit
1067 // into the constant pool.
1068 return NULL;
1069 }
1070 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1071
1072 // Security Note:
1073 // The Java level wrapper will perform the necessary security check allowing
1074 // us to pass the NULL as the initiating class loader.
1075 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1076 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1077 h_loader,
1078 Handle());
1079 #if INCLUDE_CDS
1080 if (k == NULL) {
1081 // If the class is not already loaded, try to see if it's in the shared
1082 // archive for the current classloader (h_loader).
1083 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1084 }
1085 #endif
1086 return (k == NULL) ? NULL :
1087 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1088 JVM_END
1089
1090 // Module support //////////////////////////////////////////////////////////////////////////////
1091
1092 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1093 jstring location, jobjectArray packages))
1094 Handle h_module (THREAD, JNIHandles::resolve(module));
1095 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1096 JVM_END
1097
1098 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1099 Handle h_module (THREAD, JNIHandles::resolve(module));
1100 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1101 JVM_END
1102
1103 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1104 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1105 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1106 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1107 JVM_END
1108
1109 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1110 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1111 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1112 JVM_END
1113
1114 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1115 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1116 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1117 JVM_END
1118
1119 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1120 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1121 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1122 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1126 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1127 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1128 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1129 JVM_END
1130
1131 // Reflection support //////////////////////////////////////////////////////////////////////////////
1132
1133 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1134 assert (cls != NULL, "illegal class");
1135 JvmtiVMObjectAllocEventCollector oam;
1136 ResourceMark rm(THREAD);
1137 HandleMark hm(THREAD);
1138 Handle java_class(THREAD, JNIHandles::resolve(cls));
1139 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1140 return (jstring) JNIHandles::make_local(THREAD, result);
1141 JVM_END
1142
1143
1144 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1145 JvmtiVMObjectAllocEventCollector oam;
1146 oop mirror = JNIHandles::resolve_non_null(cls);
1147
1148 // Special handling for primitive objects
1149 if (java_lang_Class::is_primitive(mirror)) {
1150 // Primitive objects does not have any interfaces
1151 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1152 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1153 }
1154
1155 Klass* klass = java_lang_Class::as_Klass(mirror);
1156 // Figure size of result array
1157 int size;
1158 if (klass->is_instance_klass()) {
1159 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1160 } else {
1161 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1162 size = 2;
1163 }
1164
1165 // Allocate result array
1166 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1167 objArrayHandle result (THREAD, r);
1168 // Fill in result
1169 if (klass->is_instance_klass()) {
1170 // Regular instance klass, fill in all local interfaces
1171 for (int index = 0; index < size; index++) {
1172 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1173 result->obj_at_put(index, k->java_mirror());
1174 }
1175 } else {
1176 // All arrays implement java.lang.Cloneable and java.io.Serializable
1177 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1178 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1179 }
1180 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1181 JVM_END
1182
1183
1184 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1185 oop mirror = JNIHandles::resolve_non_null(cls);
1186 if (java_lang_Class::is_primitive(mirror)) {
1187 return JNI_FALSE;
1188 }
1189 Klass* k = java_lang_Class::as_Klass(mirror);
1190 jboolean result = k->is_interface();
1191 assert(!result || k->is_instance_klass(),
1192 "all interfaces are instance types");
1193 // The compiler intrinsic for isInterface tests the
1194 // Klass::_access_flags bits in the same way.
1195 return result;
1196 JVM_END
1197
1198 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1199 oop mirror = JNIHandles::resolve_non_null(cls);
1200 if (java_lang_Class::is_primitive(mirror)) {
1201 return JNI_FALSE;
1202 }
1203 Klass* k = java_lang_Class::as_Klass(mirror);
1204 return k->is_hidden();
1205 JVM_END
1206
1207 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1208 JvmtiVMObjectAllocEventCollector oam;
1209 oop mirror = JNIHandles::resolve_non_null(cls);
1210 if (java_lang_Class::is_primitive(mirror)) {
1211 // There are no signers for primitive types
1212 return NULL;
1213 }
1214
1215 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1216
1217 // If there are no signers set in the class, or if the class
1218 // is an array, return NULL.
1219 if (signers == NULL) return NULL;
1220
1221 // copy of the signers array
1222 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1223 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1224 for (int index = 0; index < signers->length(); index++) {
1225 signers_copy->obj_at_put(index, signers->obj_at(index));
1226 }
1227
1228 // return the copy
1229 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1230 JVM_END
1231
1232
1233 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1234 oop mirror = JNIHandles::resolve_non_null(cls);
1235 if (!java_lang_Class::is_primitive(mirror)) {
1236 // This call is ignored for primitive types and arrays.
1237 // Signers are only set once, ClassLoader.java, and thus shouldn't
1238 // be called with an array. Only the bootstrap loader creates arrays.
1239 Klass* k = java_lang_Class::as_Klass(mirror);
1240 if (k->is_instance_klass()) {
1241 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1242 }
1243 }
1244 JVM_END
1245
1246
1247 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1248 oop mirror = JNIHandles::resolve_non_null(cls);
1249 if (mirror == NULL) {
1250 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1251 }
1252
1253 if (java_lang_Class::is_primitive(mirror)) {
1254 // Primitive types does not have a protection domain.
1255 return NULL;
1256 }
1257
1258 oop pd = java_lang_Class::protection_domain(mirror);
1259 return (jobject) JNIHandles::make_local(THREAD, pd);
1260 JVM_END
1261
1262
1263 // Returns the inherited_access_control_context field of the running thread.
1264 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1265 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1266 return JNIHandles::make_local(THREAD, result);
1267 JVM_END
1268
1269 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1270 if (!UsePrivilegedStack) return NULL;
1271
1272 ResourceMark rm(THREAD);
1273 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1274 JvmtiVMObjectAllocEventCollector oam;
1275
1276 // count the protection domains on the execution stack. We collapse
1277 // duplicate consecutive protection domains into a single one, as
1278 // well as stopping when we hit a privileged frame.
1279
1280 oop previous_protection_domain = NULL;
1281 Handle privileged_context(thread, NULL);
1282 bool is_privileged = false;
1283 oop protection_domain = NULL;
1284
1285 // Iterate through Java frames
1286 vframeStream vfst(thread);
1287 for(; !vfst.at_end(); vfst.next()) {
1288 // get method of frame
1289 Method* method = vfst.method();
1290
1291 // stop at the first privileged frame
1292 if (method->method_holder() == vmClasses::AccessController_klass() &&
1293 method->name() == vmSymbols::executePrivileged_name())
1294 {
1295 // this frame is privileged
1296 is_privileged = true;
1297
1298 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1299
1300 StackValueCollection* locals = priv->locals();
1301 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1302 StackValue* clr_sv = locals->at(2); // Class<?> caller
1303 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1304 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1305 privileged_context = ctx_sv->get_obj();
1306 Handle caller = clr_sv->get_obj();
1307
1308 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1309 protection_domain = caller_klass->protection_domain();
1310 } else {
1311 protection_domain = method->method_holder()->protection_domain();
1312 }
1313
1314 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1315 local_array->push(Handle(thread, protection_domain));
1316 previous_protection_domain = protection_domain;
1317 }
1318
1319 if (is_privileged) break;
1320 }
1321
1322
1323 // either all the domains on the stack were system domains, or
1324 // we had a privileged system domain
1325 if (local_array->is_empty()) {
1326 if (is_privileged && privileged_context.is_null()) return NULL;
1327
1328 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1329 return JNIHandles::make_local(THREAD, result);
1330 }
1331
1332 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1333 local_array->length(), CHECK_NULL);
1334 objArrayHandle h_context(thread, context);
1335 for (int index = 0; index < local_array->length(); index++) {
1336 h_context->obj_at_put(index, local_array->at(index)());
1337 }
1338
1339 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1340
1341 return JNIHandles::make_local(THREAD, result);
1342 JVM_END
1343
1344
1345 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1346 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1347 return (k != NULL) && k->is_array_klass() ? true : false;
1348 JVM_END
1349
1350
1351 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1352 oop mirror = JNIHandles::resolve_non_null(cls);
1353 return (jboolean) java_lang_Class::is_primitive(mirror);
1354 JVM_END
1355
1356
1357 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1358 oop mirror = JNIHandles::resolve_non_null(cls);
1359 if (java_lang_Class::is_primitive(mirror)) {
1360 // Primitive type
1361 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1362 }
1363
1364 Klass* k = java_lang_Class::as_Klass(mirror);
1365 debug_only(int computed_modifiers = k->compute_modifier_flags());
1366 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1367 return k->modifier_flags();
1368 JVM_END
1369
1370
1371 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1372
1373 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1374 JvmtiVMObjectAllocEventCollector oam;
1375 // ofClass is a reference to a java_lang_Class object. The mirror object
1376 // of an InstanceKlass
1377 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1378 if (java_lang_Class::is_primitive(ofMirror) ||
1379 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1380 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1381 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1382 }
1383
1384 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1385 InnerClassesIterator iter(k);
1386
1387 if (iter.length() == 0) {
1388 // Neither an inner nor outer class
1389 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1390 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1391 }
1392
1393 // find inner class info
1394 constantPoolHandle cp(thread, k->constants());
1395 int length = iter.length();
1396
1397 // Allocate temp. result array
1398 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1399 objArrayHandle result (THREAD, r);
1400 int members = 0;
1401
1402 for (; !iter.done(); iter.next()) {
1403 int ioff = iter.inner_class_info_index();
1404 int ooff = iter.outer_class_info_index();
1405
1406 if (ioff != 0 && ooff != 0) {
1407 // Check to see if the name matches the class we're looking for
1408 // before attempting to find the class.
1409 if (cp->klass_name_at_matches(k, ooff)) {
1410 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1411 if (outer_klass == k) {
1412 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1413 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1414
1415 // Throws an exception if outer klass has not declared k as
1416 // an inner klass
1417 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1418
1419 result->obj_at_put(members, inner_klass->java_mirror());
1420 members++;
1421 }
1422 }
1423 }
1424 }
1425
1426 if (members != length) {
1427 // Return array of right length
1428 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1429 for(int i = 0; i < members; i++) {
1430 res->obj_at_put(i, result->obj_at(i));
1431 }
1432 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1433 }
1434
1435 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1436 JVM_END
1437
1438
1439 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1440 {
1441 // ofClass is a reference to a java_lang_Class object.
1442 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1443 if (java_lang_Class::is_primitive(ofMirror)) {
1444 return NULL;
1445 }
1446 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1447 if (!klass->is_instance_klass()) {
1448 return NULL;
1449 }
1450
1451 bool inner_is_member = false;
1452 Klass* outer_klass
1453 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1454 if (outer_klass == NULL) return NULL; // already a top-level class
1455 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1456 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1457 }
1458 JVM_END
1459
1460 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1461 {
1462 oop mirror = JNIHandles::resolve_non_null(cls);
1463 if (java_lang_Class::is_primitive(mirror)) {
1464 return NULL;
1465 }
1466 Klass* klass = java_lang_Class::as_Klass(mirror);
1467 if (!klass->is_instance_klass()) {
1468 return NULL;
1469 }
1470 InstanceKlass* k = InstanceKlass::cast(klass);
1471 int ooff = 0, noff = 0;
1472 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1473 if (noff != 0) {
1474 constantPoolHandle i_cp(thread, k->constants());
1475 Symbol* name = i_cp->symbol_at(noff);
1476 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1477 return (jstring) JNIHandles::make_local(THREAD, str());
1478 }
1479 }
1480 return NULL;
1481 }
1482 JVM_END
1483
1484 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1485 assert (cls != NULL, "illegal class");
1486 JvmtiVMObjectAllocEventCollector oam;
1487 ResourceMark rm(THREAD);
1488 oop mirror = JNIHandles::resolve_non_null(cls);
1489 // Return null for arrays and primatives
1490 if (!java_lang_Class::is_primitive(mirror)) {
1491 Klass* k = java_lang_Class::as_Klass(mirror);
1492 if (k->is_instance_klass()) {
1493 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1494 if (sym == NULL) return NULL;
1495 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1496 return (jstring) JNIHandles::make_local(THREAD, str());
1497 }
1498 }
1499 return NULL;
1500 JVM_END
1501
1502
1503 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1504 assert (cls != NULL, "illegal class");
1505 oop mirror = JNIHandles::resolve_non_null(cls);
1506 // Return null for arrays and primitives
1507 if (!java_lang_Class::is_primitive(mirror)) {
1508 Klass* k = java_lang_Class::as_Klass(mirror);
1509 if (k->is_instance_klass()) {
1510 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1511 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1512 }
1513 }
1514 return NULL;
1515 JVM_END
1516
1517
1518 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1519 // some of this code was adapted from from jni_FromReflectedField
1520
1521 oop reflected = JNIHandles::resolve_non_null(field);
1522 oop mirror = java_lang_reflect_Field::clazz(reflected);
1523 Klass* k = java_lang_Class::as_Klass(mirror);
1524 int slot = java_lang_reflect_Field::slot(reflected);
1525 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1526
1527 InstanceKlass* ik = InstanceKlass::cast(k);
1528 intptr_t offset = ik->field_offset(slot);
1529
1530 if (modifiers & JVM_ACC_STATIC) {
1531 // for static fields we only look in the current class
1532 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1533 assert(false, "cannot find static field");
1534 return false;
1535 }
1536 } else {
1537 // for instance fields we start with the current class and work
1538 // our way up through the superclass chain
1539 if (!ik->find_field_from_offset(offset, false, &fd)) {
1540 assert(false, "cannot find instance field");
1541 return false;
1542 }
1543 }
1544 return true;
1545 }
1546
1547 static Method* jvm_get_method_common(jobject method) {
1548 // some of this code was adapted from from jni_FromReflectedMethod
1549
1550 oop reflected = JNIHandles::resolve_non_null(method);
1551 oop mirror = NULL;
1552 int slot = 0;
1553
1554 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1555 mirror = java_lang_reflect_Constructor::clazz(reflected);
1556 slot = java_lang_reflect_Constructor::slot(reflected);
1557 } else {
1558 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1559 "wrong type");
1560 mirror = java_lang_reflect_Method::clazz(reflected);
1561 slot = java_lang_reflect_Method::slot(reflected);
1562 }
1563 Klass* k = java_lang_Class::as_Klass(mirror);
1564
1565 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1566 assert(m != NULL, "cannot find method");
1567 return m; // caller has to deal with NULL in product mode
1568 }
1569
1570 /* Type use annotations support (JDK 1.8) */
1571
1572 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1573 assert (cls != NULL, "illegal class");
1574 ResourceMark rm(THREAD);
1575 // Return null for arrays and primitives
1576 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1578 if (k->is_instance_klass()) {
1579 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1580 if (type_annotations != NULL) {
1581 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1582 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1583 }
1584 }
1585 }
1586 return NULL;
1587 JVM_END
1588
1589 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1590 assert (method != NULL, "illegal method");
1591 // method is a handle to a java.lang.reflect.Method object
1592 Method* m = jvm_get_method_common(method);
1593 if (m == NULL) {
1594 return NULL;
1595 }
1596
1597 AnnotationArray* type_annotations = m->type_annotations();
1598 if (type_annotations != NULL) {
1599 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1600 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1601 }
1602
1603 return NULL;
1604 JVM_END
1605
1606 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1607 assert (field != NULL, "illegal field");
1608 fieldDescriptor fd;
1609 bool gotFd = jvm_get_field_common(field, fd);
1610 if (!gotFd) {
1611 return NULL;
1612 }
1613
1614 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1615 JVM_END
1616
1617 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1618 if (!cp->is_within_bounds(index)) {
1619 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1620 }
1621 }
1622
1623 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1624 {
1625 // method is a handle to a java.lang.reflect.Method object
1626 Method* method_ptr = jvm_get_method_common(method);
1627 methodHandle mh (THREAD, method_ptr);
1628 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1629 const int num_params = mh->method_parameters_length();
1630
1631 if (num_params < 0) {
1632 // A -1 return value from method_parameters_length means there is no
1633 // parameter data. Return null to indicate this to the reflection
1634 // API.
1635 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1636 return (jobjectArray)NULL;
1637 } else {
1638 // Otherwise, we return something up to reflection, even if it is
1639 // a zero-length array. Why? Because in some cases this can
1640 // trigger a MalformedParametersException.
1641
1642 // make sure all the symbols are properly formatted
1643 for (int i = 0; i < num_params; i++) {
1644 MethodParametersElement* params = mh->method_parameters_start();
1645 int index = params[i].name_cp_index;
1646 constantPoolHandle cp(THREAD, mh->constants());
1647 bounds_check(cp, index, CHECK_NULL);
1648
1649 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1650 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1651 "Wrong type at constant pool index");
1652 }
1653
1654 }
1655
1656 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1657 objArrayHandle result (THREAD, result_oop);
1658
1659 for (int i = 0; i < num_params; i++) {
1660 MethodParametersElement* params = mh->method_parameters_start();
1661 // For a 0 index, give a NULL symbol
1662 Symbol* sym = 0 != params[i].name_cp_index ?
1663 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1664 int flags = params[i].flags;
1665 oop param = Reflection::new_parameter(reflected_method, i, sym,
1666 flags, CHECK_NULL);
1667 result->obj_at_put(i, param);
1668 }
1669 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1670 }
1671 }
1672 JVM_END
1673
1674 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1675
1676 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1677 {
1678 JvmtiVMObjectAllocEventCollector oam;
1679
1680 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1681 // Exclude primitive types and array types
1682 if (java_lang_Class::is_primitive(ofMirror) ||
1683 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1684 // Return empty array
1685 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1686 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1687 }
1688
1689 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1690 constantPoolHandle cp(THREAD, k->constants());
1691
1692 // Ensure class is linked
1693 k->link_class(CHECK_NULL);
1694
1695 // Allocate result
1696 int num_fields;
1697
1698 if (publicOnly) {
1699 num_fields = 0;
1700 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1701 if (fs.access_flags().is_public()) ++num_fields;
1702 }
1703 } else {
1704 num_fields = k->java_fields_count();
1705 }
1706
1707 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1708 objArrayHandle result (THREAD, r);
1709
1710 int out_idx = 0;
1711 fieldDescriptor fd;
1712 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1713 if (!publicOnly || fs.access_flags().is_public()) {
1714 fd.reinitialize(k, fs.index());
1715 oop field = Reflection::new_field(&fd, CHECK_NULL);
1716 result->obj_at_put(out_idx, field);
1717 ++out_idx;
1718 }
1719 }
1720 assert(out_idx == num_fields, "just checking");
1721 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1722 }
1723 JVM_END
1724
1725 // A class is a record if and only if it is final and a direct subclass of
1726 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1727 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1728 {
1729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1730 if (k != NULL && k->is_instance_klass()) {
1731 InstanceKlass* ik = InstanceKlass::cast(k);
1732 return ik->is_record();
1733 } else {
1734 return false;
1735 }
1736 }
1737 JVM_END
1738
1739 // Returns an array containing the components of the Record attribute,
1740 // or NULL if the attribute is not present.
1741 //
1742 // Note that this function returns the components of the Record attribute
1743 // even if the class is not a record.
1744 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1745 {
1746 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1747 assert(c->is_instance_klass(), "must be");
1748 InstanceKlass* ik = InstanceKlass::cast(c);
1749
1750 Array<RecordComponent*>* components = ik->record_components();
1751 if (components != NULL) {
1752 JvmtiVMObjectAllocEventCollector oam;
1753 constantPoolHandle cp(THREAD, ik->constants());
1754 int length = components->length();
1755 assert(length >= 0, "unexpected record_components length");
1756 objArrayOop record_components =
1757 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1758 objArrayHandle components_h (THREAD, record_components);
1759
1760 for (int x = 0; x < length; x++) {
1761 RecordComponent* component = components->at(x);
1762 assert(component != NULL, "unexpected NULL record component");
1763 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1764 components_h->obj_at_put(x, component_oop);
1765 }
1766 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1767 }
1768
1769 return NULL;
1770 }
1771 JVM_END
1772
1773 static bool select_method(const methodHandle& method, bool want_constructor) {
1774 if (want_constructor) {
1775 return (method->is_initializer() && !method->is_static());
1776 } else {
1777 return (!method->is_initializer() && !method->is_overpass());
1778 }
1779 }
1780
1781 static jobjectArray get_class_declared_methods_helper(
1782 JNIEnv *env,
1783 jclass ofClass, jboolean publicOnly,
1784 bool want_constructor,
1785 Klass* klass, TRAPS) {
1786
1787 JvmtiVMObjectAllocEventCollector oam;
1788
1789 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1790 // Exclude primitive types and array types
1791 if (java_lang_Class::is_primitive(ofMirror)
1792 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1793 // Return empty array
1794 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1795 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1796 }
1797
1798 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1799
1800 // Ensure class is linked
1801 k->link_class(CHECK_NULL);
1802
1803 Array<Method*>* methods = k->methods();
1804 int methods_length = methods->length();
1805
1806 // Save original method_idnum in case of redefinition, which can change
1807 // the idnum of obsolete methods. The new method will have the same idnum
1808 // but if we refresh the methods array, the counts will be wrong.
1809 ResourceMark rm(THREAD);
1810 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1811 int num_methods = 0;
1812
1813 for (int i = 0; i < methods_length; i++) {
1814 methodHandle method(THREAD, methods->at(i));
1815 if (select_method(method, want_constructor)) {
1816 if (!publicOnly || method->is_public()) {
1817 idnums->push(method->method_idnum());
1818 ++num_methods;
1819 }
1820 }
1821 }
1822
1823 // Allocate result
1824 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1825 objArrayHandle result (THREAD, r);
1826
1827 // Now just put the methods that we selected above, but go by their idnum
1828 // in case of redefinition. The methods can be redefined at any safepoint,
1829 // so above when allocating the oop array and below when creating reflect
1830 // objects.
1831 for (int i = 0; i < num_methods; i++) {
1832 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1833 if (method.is_null()) {
1834 // Method may have been deleted and seems this API can handle null
1835 // Otherwise should probably put a method that throws NSME
1836 result->obj_at_put(i, NULL);
1837 } else {
1838 oop m;
1839 if (want_constructor) {
1840 m = Reflection::new_constructor(method, CHECK_NULL);
1841 } else {
1842 m = Reflection::new_method(method, false, CHECK_NULL);
1843 }
1844 result->obj_at_put(i, m);
1845 }
1846 }
1847
1848 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1849 }
1850
1851 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1852 {
1853 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1854 /*want_constructor*/ false,
1855 vmClasses::reflect_Method_klass(), THREAD);
1856 }
1857 JVM_END
1858
1859 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1860 {
1861 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1862 /*want_constructor*/ true,
1863 vmClasses::reflect_Constructor_klass(), THREAD);
1864 }
1865 JVM_END
1866
1867 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1868 {
1869 oop mirror = JNIHandles::resolve_non_null(cls);
1870 if (java_lang_Class::is_primitive(mirror)) {
1871 // Primitive type
1872 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1873 }
1874
1875 Klass* k = java_lang_Class::as_Klass(mirror);
1876 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1877 }
1878 JVM_END
1879
1880 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1881 {
1882 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1883 assert(c->is_instance_klass(), "must be");
1884 InstanceKlass* ck = InstanceKlass::cast(c);
1885 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1886 assert(m->is_instance_klass(), "must be");
1887 InstanceKlass* mk = InstanceKlass::cast(m);
1888 return ck->has_nestmate_access_to(mk, THREAD);
1889 }
1890 JVM_END
1891
1892 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1893 {
1894 // current is not a primitive or array class
1895 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1896 assert(c->is_instance_klass(), "must be");
1897 InstanceKlass* ck = InstanceKlass::cast(c);
1898 InstanceKlass* host = ck->nest_host(THREAD);
1899 return (jclass) (host == NULL ? NULL :
1900 JNIHandles::make_local(THREAD, host->java_mirror()));
1901 }
1902 JVM_END
1903
1904 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1905 {
1906 // current is not a primitive or array class
1907 ResourceMark rm(THREAD);
1908 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1909 assert(c->is_instance_klass(), "must be");
1910 InstanceKlass* ck = InstanceKlass::cast(c);
1911 InstanceKlass* host = ck->nest_host(THREAD);
1912
1913 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1914 ck->external_name(), host->external_name());
1915 {
1916 JvmtiVMObjectAllocEventCollector oam;
1917 Array<u2>* members = host->nest_members();
1918 int length = members == NULL ? 0 : members->length();
1919
1920 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1921
1922 // nest host is first in the array so make it one bigger
1923 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1924 length + 1, CHECK_NULL);
1925 objArrayHandle result(THREAD, r);
1926 result->obj_at_put(0, host->java_mirror());
1927 if (length != 0) {
1928 int count = 0;
1929 for (int i = 0; i < length; i++) {
1930 int cp_index = members->at(i);
1931 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1932 if (HAS_PENDING_EXCEPTION) {
1933 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1934 return NULL; // propagate VMEs
1935 }
1936 if (log_is_enabled(Trace, class, nestmates)) {
1937 stringStream ss;
1938 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1939 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1940 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1941 log_trace(class, nestmates)("%s", ss.as_string());
1942 }
1943 CLEAR_PENDING_EXCEPTION;
1944 continue;
1945 }
1946 if (k->is_instance_klass()) {
1947 InstanceKlass* ik = InstanceKlass::cast(k);
1948 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1949 if (nest_host_k == host) {
1950 result->obj_at_put(count+1, k->java_mirror());
1951 count++;
1952 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1953 } else {
1954 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1955 ik->external_name(), nest_host_k->external_name());
1956 }
1957 } else {
1958 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1959 k->external_name());
1960 }
1961 }
1962 if (count < length) {
1963 // we had invalid entries so we need to compact the array
1964 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1965 length + 1, count + 1);
1966
1967 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1968 count + 1, CHECK_NULL);
1969 objArrayHandle result2(THREAD, r2);
1970 for (int i = 0; i < count + 1; i++) {
1971 result2->obj_at_put(i, result->obj_at(i));
1972 }
1973 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1974 }
1975 }
1976 else {
1977 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
1978 }
1979 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1980 }
1981 }
1982 JVM_END
1983
1984 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1985 {
1986 oop mirror = JNIHandles::resolve_non_null(current);
1987 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1988 Klass* c = java_lang_Class::as_Klass(mirror);
1989 assert(c->is_instance_klass(), "must be");
1990 InstanceKlass* ik = InstanceKlass::cast(c);
1991 ResourceMark rm(THREAD);
1992 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1993 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1994 if (ik->is_sealed()) {
1995 JvmtiVMObjectAllocEventCollector oam;
1996 Array<u2>* subclasses = ik->permitted_subclasses();
1997 int length = subclasses->length();
1998
1999 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2000
2001 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2002 length, CHECK_NULL);
2003 objArrayHandle result(THREAD, r);
2004 int count = 0;
2005 for (int i = 0; i < length; i++) {
2006 int cp_index = subclasses->at(i);
2007 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2008 if (HAS_PENDING_EXCEPTION) {
2009 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2010 return NULL; // propagate VMEs
2011 }
2012 if (log_is_enabled(Trace, class, sealed)) {
2013 stringStream ss;
2014 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2015 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2016 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2017 log_trace(class, sealed)("%s", ss.as_string());
2018 }
2019
2020 CLEAR_PENDING_EXCEPTION;
2021 continue;
2022 }
2023 if (k->is_instance_klass()) {
2024 result->obj_at_put(count++, k->java_mirror());
2025 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2026 }
2027 }
2028 if (count < length) {
2029 // we had invalid entries so we need to compact the array
2030 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2031 count, CHECK_NULL);
2032 objArrayHandle result2(THREAD, r2);
2033 for (int i = 0; i < count; i++) {
2034 result2->obj_at_put(i, result->obj_at(i));
2035 }
2036 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2037 }
2038 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2039 } else {
2040 return NULL;
2041 }
2042 }
2043 JVM_END
2044
2045 // Constant pool access //////////////////////////////////////////////////////////
2046
2047 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2048 {
2049 JvmtiVMObjectAllocEventCollector oam;
2050 oop mirror = JNIHandles::resolve_non_null(cls);
2051 // Return null for primitives and arrays
2052 if (!java_lang_Class::is_primitive(mirror)) {
2053 Klass* k = java_lang_Class::as_Klass(mirror);
2054 if (k->is_instance_klass()) {
2055 InstanceKlass* k_h = InstanceKlass::cast(k);
2056 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2057 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2058 return JNIHandles::make_local(THREAD, jcp());
2059 }
2060 }
2061 return NULL;
2062 }
2063 JVM_END
2064
2065
2066 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2067 {
2068 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2069 return cp->length();
2070 }
2071 JVM_END
2072
2073
2074 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2075 {
2076 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2077 bounds_check(cp, index, CHECK_NULL);
2078 constantTag tag = cp->tag_at(index);
2079 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2080 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2081 }
2082 Klass* k = cp->klass_at(index, CHECK_NULL);
2083 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2088 {
2089 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090 bounds_check(cp, index, CHECK_NULL);
2091 constantTag tag = cp->tag_at(index);
2092 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2093 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2094 }
2095 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2096 if (k == NULL) return NULL;
2097 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2098 }
2099 JVM_END
2100
2101 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2102 constantTag tag = cp->tag_at(index);
2103 if (!tag.is_method() && !tag.is_interface_method()) {
2104 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2105 }
2106 int klass_ref = cp->uncached_klass_ref_index_at(index);
2107 Klass* k_o;
2108 if (force_resolution) {
2109 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2110 } else {
2111 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2112 if (k_o == NULL) return NULL;
2113 }
2114 InstanceKlass* k = InstanceKlass::cast(k_o);
2115 Symbol* name = cp->uncached_name_ref_at(index);
2116 Symbol* sig = cp->uncached_signature_ref_at(index);
2117 methodHandle m (THREAD, k->find_method(name, sig));
2118 if (m.is_null()) {
2119 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2120 }
2121 oop method;
2122 if (!m->is_initializer() || m->is_static()) {
2123 method = Reflection::new_method(m, true, CHECK_NULL);
2124 } else {
2125 method = Reflection::new_constructor(m, CHECK_NULL);
2126 }
2127 return JNIHandles::make_local(THREAD, method);
2128 }
2129
2130 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2131 {
2132 JvmtiVMObjectAllocEventCollector oam;
2133 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2134 bounds_check(cp, index, CHECK_NULL);
2135 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2136 return res;
2137 }
2138 JVM_END
2139
2140 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2141 {
2142 JvmtiVMObjectAllocEventCollector oam;
2143 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2144 bounds_check(cp, index, CHECK_NULL);
2145 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2146 return res;
2147 }
2148 JVM_END
2149
2150 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2151 constantTag tag = cp->tag_at(index);
2152 if (!tag.is_field()) {
2153 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2154 }
2155 int klass_ref = cp->uncached_klass_ref_index_at(index);
2156 Klass* k_o;
2157 if (force_resolution) {
2158 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2159 } else {
2160 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2161 if (k_o == NULL) return NULL;
2162 }
2163 InstanceKlass* k = InstanceKlass::cast(k_o);
2164 Symbol* name = cp->uncached_name_ref_at(index);
2165 Symbol* sig = cp->uncached_signature_ref_at(index);
2166 fieldDescriptor fd;
2167 Klass* target_klass = k->find_field(name, sig, &fd);
2168 if (target_klass == NULL) {
2169 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2170 }
2171 oop field = Reflection::new_field(&fd, CHECK_NULL);
2172 return JNIHandles::make_local(THREAD, field);
2173 }
2174
2175 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2176 {
2177 JvmtiVMObjectAllocEventCollector oam;
2178 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2179 bounds_check(cp, index, CHECK_NULL);
2180 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2181 return res;
2182 }
2183 JVM_END
2184
2185 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2186 {
2187 JvmtiVMObjectAllocEventCollector oam;
2188 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2189 bounds_check(cp, index, CHECK_NULL);
2190 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2191 return res;
2192 }
2193 JVM_END
2194
2195 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2196 {
2197 JvmtiVMObjectAllocEventCollector oam;
2198 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2199 bounds_check(cp, index, CHECK_NULL);
2200 constantTag tag = cp->tag_at(index);
2201 if (!tag.is_field_or_method()) {
2202 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2203 }
2204 int klass_ref = cp->uncached_klass_ref_index_at(index);
2205 Symbol* klass_name = cp->klass_name_at(klass_ref);
2206 Symbol* member_name = cp->uncached_name_ref_at(index);
2207 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2208 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2209 objArrayHandle dest(THREAD, dest_o);
2210 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2211 dest->obj_at_put(0, str());
2212 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2213 dest->obj_at_put(1, str());
2214 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2215 dest->obj_at_put(2, str());
2216 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2217 }
2218 JVM_END
2219
2220 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2221 {
2222 JvmtiVMObjectAllocEventCollector oam;
2223 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2224 bounds_check(cp, index, CHECK_0);
2225 constantTag tag = cp->tag_at(index);
2226 if (!tag.is_field_or_method()) {
2227 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2228 }
2229 return (jint) cp->uncached_klass_ref_index_at(index);
2230 }
2231 JVM_END
2232
2233 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2234 {
2235 JvmtiVMObjectAllocEventCollector oam;
2236 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2237 bounds_check(cp, index, CHECK_0);
2238 constantTag tag = cp->tag_at(index);
2239 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2240 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2241 }
2242 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2243 }
2244 JVM_END
2245
2246 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2247 {
2248 JvmtiVMObjectAllocEventCollector oam;
2249 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2250 bounds_check(cp, index, CHECK_NULL);
2251 constantTag tag = cp->tag_at(index);
2252 if (!tag.is_name_and_type()) {
2253 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2254 }
2255 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2256 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2257 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2258 objArrayHandle dest(THREAD, dest_o);
2259 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2260 dest->obj_at_put(0, str());
2261 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2262 dest->obj_at_put(1, str());
2263 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2268 {
2269 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2270 bounds_check(cp, index, CHECK_0);
2271 constantTag tag = cp->tag_at(index);
2272 if (!tag.is_int()) {
2273 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2274 }
2275 return cp->int_at(index);
2276 }
2277 JVM_END
2278
2279 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2280 {
2281 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282 bounds_check(cp, index, CHECK_(0L));
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_long()) {
2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 return cp->long_at(index);
2288 }
2289 JVM_END
2290
2291 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2292 {
2293 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2294 bounds_check(cp, index, CHECK_(0.0f));
2295 constantTag tag = cp->tag_at(index);
2296 if (!tag.is_float()) {
2297 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2298 }
2299 return cp->float_at(index);
2300 }
2301 JVM_END
2302
2303 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2304 {
2305 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2306 bounds_check(cp, index, CHECK_(0.0));
2307 constantTag tag = cp->tag_at(index);
2308 if (!tag.is_double()) {
2309 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2310 }
2311 return cp->double_at(index);
2312 }
2313 JVM_END
2314
2315 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2316 {
2317 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2318 bounds_check(cp, index, CHECK_NULL);
2319 constantTag tag = cp->tag_at(index);
2320 if (!tag.is_string()) {
2321 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2322 }
2323 oop str = cp->string_at(index, CHECK_NULL);
2324 return (jstring) JNIHandles::make_local(THREAD, str);
2325 }
2326 JVM_END
2327
2328 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2329 {
2330 JvmtiVMObjectAllocEventCollector oam;
2331 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2332 bounds_check(cp, index, CHECK_NULL);
2333 constantTag tag = cp->tag_at(index);
2334 if (!tag.is_symbol()) {
2335 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2336 }
2337 Symbol* sym = cp->symbol_at(index);
2338 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2339 return (jstring) JNIHandles::make_local(THREAD, str());
2340 }
2341 JVM_END
2342
2343 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2344 {
2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346 bounds_check(cp, index, CHECK_0);
2347 constantTag tag = cp->tag_at(index);
2348 jbyte result = tag.value();
2349 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2350 // they are changed to the corresponding tags from the JVM spec, so that java code in
2351 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2352 if (tag.is_klass_or_reference()) {
2353 result = JVM_CONSTANT_Class;
2354 } else if (tag.is_string_index()) {
2355 result = JVM_CONSTANT_String;
2356 } else if (tag.is_method_type_in_error()) {
2357 result = JVM_CONSTANT_MethodType;
2358 } else if (tag.is_method_handle_in_error()) {
2359 result = JVM_CONSTANT_MethodHandle;
2360 } else if (tag.is_dynamic_constant_in_error()) {
2361 result = JVM_CONSTANT_Dynamic;
2362 }
2363 return result;
2364 }
2365 JVM_END
2366
2367 // Assertion support. //////////////////////////////////////////////////////////
2368
2369 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2370 assert(cls != NULL, "bad class");
2371
2372 oop r = JNIHandles::resolve(cls);
2373 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2374 if (java_lang_Class::is_primitive(r)) return false;
2375
2376 Klass* k = java_lang_Class::as_Klass(r);
2377 assert(k->is_instance_klass(), "must be an instance klass");
2378 if (!k->is_instance_klass()) return false;
2379
2380 ResourceMark rm(THREAD);
2381 const char* name = k->name()->as_C_string();
2382 bool system_class = k->class_loader() == NULL;
2383 return JavaAssertions::enabled(name, system_class);
2384
2385 JVM_END
2386
2387
2388 // Return a new AssertionStatusDirectives object with the fields filled in with
2389 // command-line assertion arguments (i.e., -ea, -da).
2390 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2391 JvmtiVMObjectAllocEventCollector oam;
2392 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2393 return JNIHandles::make_local(THREAD, asd);
2394 JVM_END
2395
2396 // Verification ////////////////////////////////////////////////////////////////////////////////
2397
2398 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2399
2400 // RedefineClasses support: bug 6214132 caused verification to fail.
2401 // All functions from this section should call the jvmtiThreadSate function:
2402 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2403 // The function returns a Klass* of the _scratch_class if the verifier
2404 // was invoked in the middle of the class redefinition.
2405 // Otherwise it returns its argument value which is the _the_class Klass*.
2406 // Please, refer to the description in the jvmtiThreadSate.hpp.
2407
2408 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 return k->name()->as_utf8();
2412 JVM_END
2413
2414
2415 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2418 // types will have length zero if this is not an InstanceKlass
2419 // (length is determined by call to JVM_GetClassCPEntriesCount)
2420 if (k->is_instance_klass()) {
2421 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2422 for (int index = cp->length() - 1; index >= 0; index--) {
2423 constantTag tag = cp->tag_at(index);
2424 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2425 }
2426 }
2427 JVM_END
2428
2429
2430 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2434 JVM_END
2435
2436
2437 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2441 JVM_END
2442
2443
2444 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2447 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2448 JVM_END
2449
2450
2451 // The following methods, used for the verifier, are never called with
2452 // array klasses, so a direct cast to InstanceKlass is safe.
2453 // Typically, these methods are called in a loop with bounds determined
2454 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2455 // zero for arrays.
2456 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2457 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2458 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2459 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2460 int length = method->checked_exceptions_length();
2461 if (length > 0) {
2462 CheckedExceptionElement* table= method->checked_exceptions_start();
2463 for (int i = 0; i < length; i++) {
2464 exceptions[i] = table[i].class_cp_index;
2465 }
2466 }
2467 JVM_END
2468
2469
2470 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2474 return method->checked_exceptions_length();
2475 JVM_END
2476
2477
2478 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2480 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2481 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2482 memcpy(code, method->code_base(), method->code_size());
2483 JVM_END
2484
2485
2486 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2490 return method->code_size();
2491 JVM_END
2492
2493
2494 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2498 ExceptionTable extable(method);
2499 entry->start_pc = extable.start_pc(entry_index);
2500 entry->end_pc = extable.end_pc(entry_index);
2501 entry->handler_pc = extable.handler_pc(entry_index);
2502 entry->catchType = extable.catch_type_index(entry_index);
2503 JVM_END
2504
2505
2506 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2507 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2508 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2509 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2510 return method->exception_table_length();
2511 JVM_END
2512
2513
2514 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2518 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2519 JVM_END
2520
2521
2522 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2524 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2525 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2526 JVM_END
2527
2528
2529 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2531 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2532 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2533 return method->max_locals();
2534 JVM_END
2535
2536
2537 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2540 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2541 return method->size_of_parameters();
2542 JVM_END
2543
2544
2545 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2548 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2549 return method->verifier_max_stack();
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2554 ResourceMark rm(THREAD);
2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2557 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2558 return method->name() == vmSymbols::object_initializer_name();
2559 JVM_END
2560
2561
2562 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2563 ResourceMark rm(THREAD);
2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2567 return method->is_overpass();
2568 JVM_END
2569
2570 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574 return method->name()->as_utf8();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582 return method->signature()->as_utf8();
2583 JVM_END
2584
2585 /**
2586 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2587 * read entries in the constant pool. Since the old verifier always
2588 * works on a copy of the code, it will not see any rewriting that
2589 * may possibly occur in the middle of verification. So it is important
2590 * that nothing it calls tries to use the cpCache instead of the raw
2591 * constant pool, so we must use cp->uncached_x methods when appropriate.
2592 */
2593 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2597 switch (cp->tag_at(cp_index).value()) {
2598 case JVM_CONSTANT_Fieldref:
2599 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2600 default:
2601 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2602 }
2603 ShouldNotReachHere();
2604 return NULL;
2605 JVM_END
2606
2607
2608 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2612 switch (cp->tag_at(cp_index).value()) {
2613 case JVM_CONSTANT_InterfaceMethodref:
2614 case JVM_CONSTANT_Methodref:
2615 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2616 default:
2617 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2618 }
2619 ShouldNotReachHere();
2620 return NULL;
2621 JVM_END
2622
2623
2624 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2628 switch (cp->tag_at(cp_index).value()) {
2629 case JVM_CONSTANT_InterfaceMethodref:
2630 case JVM_CONSTANT_Methodref:
2631 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2632 default:
2633 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2634 }
2635 ShouldNotReachHere();
2636 return NULL;
2637 JVM_END
2638
2639
2640 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2644 switch (cp->tag_at(cp_index).value()) {
2645 case JVM_CONSTANT_Fieldref:
2646 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2647 default:
2648 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2649 }
2650 ShouldNotReachHere();
2651 return NULL;
2652 JVM_END
2653
2654
2655 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2658 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2659 Symbol* classname = cp->klass_name_at(cp_index);
2660 return classname->as_utf8();
2661 JVM_END
2662
2663
2664 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2667 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2668 switch (cp->tag_at(cp_index).value()) {
2669 case JVM_CONSTANT_Fieldref: {
2670 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2671 Symbol* classname = cp->klass_name_at(class_index);
2672 return classname->as_utf8();
2673 }
2674 default:
2675 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2676 }
2677 ShouldNotReachHere();
2678 return NULL;
2679 JVM_END
2680
2681
2682 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2685 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2686 switch (cp->tag_at(cp_index).value()) {
2687 case JVM_CONSTANT_Methodref:
2688 case JVM_CONSTANT_InterfaceMethodref: {
2689 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2690 Symbol* classname = cp->klass_name_at(class_index);
2691 return classname->as_utf8();
2692 }
2693 default:
2694 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2695 }
2696 ShouldNotReachHere();
2697 return NULL;
2698 JVM_END
2699
2700
2701 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2703 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2706 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2707 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2708 switch (cp->tag_at(cp_index).value()) {
2709 case JVM_CONSTANT_Fieldref: {
2710 Symbol* name = cp->uncached_name_ref_at(cp_index);
2711 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2712 InstanceKlass* ik = InstanceKlass::cast(k_called);
2713 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2714 if (fs.name() == name && fs.signature() == signature) {
2715 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2716 }
2717 }
2718 return -1;
2719 }
2720 default:
2721 fatal("JVM_GetCPFieldModifiers: illegal constant");
2722 }
2723 ShouldNotReachHere();
2724 return 0;
2725 JVM_END
2726
2727
2728 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2730 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2733 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2734 switch (cp->tag_at(cp_index).value()) {
2735 case JVM_CONSTANT_Methodref:
2736 case JVM_CONSTANT_InterfaceMethodref: {
2737 Symbol* name = cp->uncached_name_ref_at(cp_index);
2738 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2739 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2740 int methods_count = methods->length();
2741 for (int i = 0; i < methods_count; i++) {
2742 Method* method = methods->at(i);
2743 if (method->name() == name && method->signature() == signature) {
2744 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2745 }
2746 }
2747 return -1;
2748 }
2749 default:
2750 fatal("JVM_GetCPMethodModifiers: illegal constant");
2751 }
2752 ShouldNotReachHere();
2753 return 0;
2754 JVM_END
2755
2756
2757 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2758
2759 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2760 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2761 JVM_END
2762
2763
2764 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2765 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2766 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2767 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2768 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2769 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2770 JVM_END
2771
2772 // Printing support //////////////////////////////////////////////////
2773 extern "C" {
2774
2775 ATTRIBUTE_PRINTF(3, 0)
2776 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2777 // Reject count values that are negative signed values converted to
2778 // unsigned; see bug 4399518, 4417214
2779 if ((intptr_t)count <= 0) return -1;
2780
2781 int result = os::vsnprintf(str, count, fmt, args);
2782 if (result > 0 && (size_t)result >= count) {
2783 result = -1;
2784 }
2785
2786 return result;
2787 }
2788
2789 ATTRIBUTE_PRINTF(3, 4)
2790 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2791 va_list args;
2792 int len;
2793 va_start(args, fmt);
2794 len = jio_vsnprintf(str, count, fmt, args);
2795 va_end(args);
2796 return len;
2797 }
2798
2799 ATTRIBUTE_PRINTF(2, 3)
2800 int jio_fprintf(FILE* f, const char *fmt, ...) {
2801 int len;
2802 va_list args;
2803 va_start(args, fmt);
2804 len = jio_vfprintf(f, fmt, args);
2805 va_end(args);
2806 return len;
2807 }
2808
2809 ATTRIBUTE_PRINTF(2, 0)
2810 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2811 if (Arguments::vfprintf_hook() != NULL) {
2812 return Arguments::vfprintf_hook()(f, fmt, args);
2813 } else {
2814 return vfprintf(f, fmt, args);
2815 }
2816 }
2817
2818 ATTRIBUTE_PRINTF(1, 2)
2819 JNIEXPORT int jio_printf(const char *fmt, ...) {
2820 int len;
2821 va_list args;
2822 va_start(args, fmt);
2823 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2824 va_end(args);
2825 return len;
2826 }
2827
2828 // HotSpot specific jio method
2829 void jio_print(const char* s, size_t len) {
2830 // Try to make this function as atomic as possible.
2831 if (Arguments::vfprintf_hook() != NULL) {
2832 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2833 } else {
2834 // Make an unused local variable to avoid warning from gcc compiler.
2835 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2836 }
2837 }
2838
2839 } // Extern C
2840
2841 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2842
2843 // In most of the JVM thread support functions we need to access the
2844 // thread through a ThreadsListHandle to prevent it from exiting and
2845 // being reclaimed while we try to operate on it. The exceptions to this
2846 // rule are when operating on the current thread, or if the monitor of
2847 // the target java.lang.Thread is locked at the Java level - in both
2848 // cases the target cannot exit.
2849
2850 static void thread_entry(JavaThread* thread, TRAPS) {
2851 HandleMark hm(THREAD);
2852 Handle obj(THREAD, thread->threadObj());
2853 JavaValue result(T_VOID);
2854 JavaCalls::call_virtual(&result,
2855 obj,
2856 vmClasses::Thread_klass(),
2857 vmSymbols::run_method_name(),
2858 vmSymbols::void_method_signature(),
2859 THREAD);
2860 }
2861
2862
2863 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2864 JavaThread *native_thread = NULL;
2865
2866 // We cannot hold the Threads_lock when we throw an exception,
2867 // due to rank ordering issues. Example: we might need to grab the
2868 // Heap_lock while we construct the exception.
2869 bool throw_illegal_thread_state = false;
2870
2871 // We must release the Threads_lock before we can post a jvmti event
2872 // in Thread::start.
2873 {
2874 // Ensure that the C++ Thread and OSThread structures aren't freed before
2875 // we operate.
2876 MutexLocker mu(Threads_lock);
2877
2878 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2879 // re-starting an already started thread, so we should usually find
2880 // that the JavaThread is null. However for a JNI attached thread
2881 // there is a small window between the Thread object being created
2882 // (with its JavaThread set) and the update to its threadStatus, so we
2883 // have to check for this
2884 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2885 throw_illegal_thread_state = true;
2886 } else {
2887 // We could also check the stillborn flag to see if this thread was already stopped, but
2888 // for historical reasons we let the thread detect that itself when it starts running
2889
2890 jlong size =
2891 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2892 // Allocate the C++ Thread structure and create the native thread. The
2893 // stack size retrieved from java is 64-bit signed, but the constructor takes
2894 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2895 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2896 // - Avoid passing negative values which would result in really large stacks.
2897 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2898 size_t sz = size > 0 ? (size_t) size : 0;
2899 native_thread = new JavaThread(&thread_entry, sz);
2900
2901 // At this point it may be possible that no osthread was created for the
2902 // JavaThread due to lack of memory. Check for this situation and throw
2903 // an exception if necessary. Eventually we may want to change this so
2904 // that we only grab the lock if the thread was created successfully -
2905 // then we can also do this check and throw the exception in the
2906 // JavaThread constructor.
2907 if (native_thread->osthread() != NULL) {
2908 // Note: the current thread is not being used within "prepare".
2909 native_thread->prepare(jthread);
2910 }
2911 }
2912 }
2913
2914 if (throw_illegal_thread_state) {
2915 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2916 }
2917
2918 assert(native_thread != NULL, "Starting null thread?");
2919
2920 if (native_thread->osthread() == NULL) {
2921 ResourceMark rm(thread);
2922 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2923 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2924 // No one should hold a reference to the 'native_thread'.
2925 native_thread->smr_delete();
2926 if (JvmtiExport::should_post_resource_exhausted()) {
2927 JvmtiExport::post_resource_exhausted(
2928 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2929 os::native_thread_creation_failed_msg());
2930 }
2931 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2932 os::native_thread_creation_failed_msg());
2933 }
2934
2935 #if INCLUDE_JFR
2936 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
2937 EventThreadStart::is_stacktrace_enabled()) {
2938 JfrThreadLocal* tl = native_thread->jfr_thread_local();
2939 // skip Thread.start() and Thread.start0()
2940 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
2941 }
2942 #endif
2943
2944 Thread::start(native_thread);
2945
2946 JVM_END
2947
2948
2949 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2950 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2951 // but is thought to be reliable and simple. In the case, where the receiver is the
2952 // same thread as the sender, no VM_Operation is needed.
2953 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2954 ThreadsListHandle tlh(thread);
2955 oop java_throwable = JNIHandles::resolve(throwable);
2956 if (java_throwable == NULL) {
2957 THROW(vmSymbols::java_lang_NullPointerException());
2958 }
2959 oop java_thread = NULL;
2960 JavaThread* receiver = NULL;
2961 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2962 Events::log_exception(thread,
2963 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2964 p2i(receiver), p2i(java_thread), p2i(throwable));
2965
2966 if (is_alive) {
2967 // jthread refers to a live JavaThread.
2968 if (thread == receiver) {
2969 // Exception is getting thrown at self so no VM_Operation needed.
2970 THROW_OOP(java_throwable);
2971 } else {
2972 // Use a VM_Operation to throw the exception.
2973 JavaThread::send_async_exception(receiver, java_throwable);
2974 }
2975 } else {
2976 // Either:
2977 // - target thread has not been started before being stopped, or
2978 // - target thread already terminated
2979 // We could read the threadStatus to determine which case it is
2980 // but that is overkill as it doesn't matter. We must set the
2981 // stillborn flag for the first case, and if the thread has already
2982 // exited setting this flag has no effect.
2983 java_lang_Thread::set_stillborn(java_thread);
2984 }
2985 JVM_END
2986
2987
2988 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2989 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2990 return java_lang_Thread::is_alive(thread_oop);
2991 JVM_END
2992
2993
2994 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2995 ThreadsListHandle tlh(thread);
2996 JavaThread* receiver = NULL;
2997 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2998 if (is_alive) {
2999 // jthread refers to a live JavaThread, but java_suspend() will
3000 // detect a thread that has started to exit and will ignore it.
3001 receiver->java_suspend();
3002 }
3003 JVM_END
3004
3005
3006 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3007 ThreadsListHandle tlh(thread);
3008 JavaThread* receiver = NULL;
3009 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3010 if (is_alive) {
3011 // jthread refers to a live JavaThread.
3012 receiver->java_resume();
3013 }
3014 JVM_END
3015
3016
3017 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3018 ThreadsListHandle tlh(thread);
3019 oop java_thread = NULL;
3020 JavaThread* receiver = NULL;
3021 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3022 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3023
3024 if (is_alive) {
3025 // jthread refers to a live JavaThread.
3026 Thread::set_priority(receiver, (ThreadPriority)prio);
3027 }
3028 // Implied else: If the JavaThread hasn't started yet, then the
3029 // priority set in the java.lang.Thread object above will be pushed
3030 // down when it does start.
3031 JVM_END
3032
3033
3034 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3035 if (os::dont_yield()) return;
3036 HOTSPOT_THREAD_YIELD();
3037 os::naked_yield();
3038 JVM_END
3039
3040 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3041 assert(event != NULL, "invariant");
3042 assert(event->should_commit(), "invariant");
3043 event->set_time(millis);
3044 event->commit();
3045 }
3046
3047 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3048 if (millis < 0) {
3049 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3050 }
3051
3052 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3053 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3054 }
3055
3056 // Save current thread state and restore it at the end of this block.
3057 // And set new thread state to SLEEPING.
3058 JavaThreadSleepState jtss(thread);
3059
3060 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3061 EventThreadSleep event;
3062
3063 if (millis == 0) {
3064 os::naked_yield();
3065 } else {
3066 ThreadState old_state = thread->osthread()->get_state();
3067 thread->osthread()->set_state(SLEEPING);
3068 if (!thread->sleep(millis)) { // interrupted
3069 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3070 // us while we were sleeping. We do not overwrite those.
3071 if (!HAS_PENDING_EXCEPTION) {
3072 if (event.should_commit()) {
3073 post_thread_sleep_event(&event, millis);
3074 }
3075 HOTSPOT_THREAD_SLEEP_END(1);
3076
3077 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3078 // to properly restore the thread state. That's likely wrong.
3079 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3080 }
3081 }
3082 thread->osthread()->set_state(old_state);
3083 }
3084 if (event.should_commit()) {
3085 post_thread_sleep_event(&event, millis);
3086 }
3087 HOTSPOT_THREAD_SLEEP_END(0);
3088 JVM_END
3089
3090 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3091 oop jthread = thread->threadObj();
3092 assert(jthread != NULL, "no current thread!");
3093 return JNIHandles::make_local(THREAD, jthread);
3094 JVM_END
3095
3096 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3097 ThreadsListHandle tlh(thread);
3098 JavaThread* receiver = NULL;
3099 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3100 if (is_alive) {
3101 // jthread refers to a live JavaThread.
3102 receiver->interrupt();
3103 }
3104 JVM_END
3105
3106
3107 // Return true iff the current thread has locked the object passed in
3108
3109 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3110 if (obj == NULL) {
3111 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3112 }
3113 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3114 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3115 JVM_END
3116
3117
3118 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3119 VM_PrintThreads op;
3120 VMThread::execute(&op);
3121 if (JvmtiExport::should_post_data_dump()) {
3122 JvmtiExport::post_data_dump();
3123 }
3124 JVM_END
3125
3126 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3127 // We don't use a ThreadsListHandle here because the current thread
3128 // must be alive.
3129 oop java_thread = JNIHandles::resolve_non_null(jthread);
3130 JavaThread* thr = java_lang_Thread::thread(java_thread);
3131 if (thread == thr && !thr->has_attached_via_jni()) {
3132 // Thread naming is only supported for the current thread and
3133 // we don't set the name of an attached thread to avoid stepping
3134 // on other programs.
3135 ResourceMark rm(thread);
3136 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3137 os::set_native_thread_name(thread_name);
3138 }
3139 JVM_END
3140
3141 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3142
3143 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3144 ResourceMark rm(THREAD);
3145 JvmtiVMObjectAllocEventCollector oam;
3146 vframeStream vfst(thread);
3147
3148 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3149 // This must only be called from SecurityManager.getClassContext
3150 Method* m = vfst.method();
3151 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3152 m->name() == vmSymbols::getClassContext_name() &&
3153 m->signature() == vmSymbols::void_class_array_signature())) {
3154 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3155 }
3156 }
3157
3158 // Collect method holders
3159 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3160 for (; !vfst.at_end(); vfst.security_next()) {
3161 Method* m = vfst.method();
3162 // Native frames are not returned
3163 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3164 Klass* holder = m->method_holder();
3165 assert(holder->is_klass(), "just checking");
3166 klass_array->append(holder);
3167 }
3168 }
3169
3170 // Create result array of type [Ljava/lang/Class;
3171 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3172 // Fill in mirrors corresponding to method holders
3173 for (int i = 0; i < klass_array->length(); i++) {
3174 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3175 }
3176
3177 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3178 JVM_END
3179
3180
3181 // java.lang.Package ////////////////////////////////////////////////////////////////
3182
3183
3184 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3185 ResourceMark rm(THREAD);
3186 JvmtiVMObjectAllocEventCollector oam;
3187 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3188 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3189 return (jstring) JNIHandles::make_local(THREAD, result);
3190 JVM_END
3191
3192
3193 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3194 JvmtiVMObjectAllocEventCollector oam;
3195 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3196 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3197 JVM_END
3198
3199
3200 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3201
3202
3203 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3204 MonitorLocker ml(Heap_lock);
3205 oop ref = Universe::reference_pending_list();
3206 if (ref != NULL) {
3207 Universe::clear_reference_pending_list();
3208 }
3209 return JNIHandles::make_local(THREAD, ref);
3210 JVM_END
3211
3212 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3213 MonitorLocker ml(Heap_lock);
3214 return Universe::has_reference_pending_list();
3215 JVM_END
3216
3217 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3218 MonitorLocker ml(Heap_lock);
3219 while (!Universe::has_reference_pending_list()) {
3220 ml.wait();
3221 }
3222 JVM_END
3223
3224 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3225 oop ref_oop = JNIHandles::resolve_non_null(ref);
3226 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3227 return referent == JNIHandles::resolve(o);
3228 JVM_END
3229
3230 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3231 oop ref_oop = JNIHandles::resolve_non_null(ref);
3232 // FinalReference has it's own implementation of clear().
3233 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3234 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3235 // If the referent has already been cleared then done.
3236 // However, if the referent is dead but has not yet been cleared by
3237 // concurrent reference processing, it should NOT be cleared here.
3238 // Instead, clearing should be left to the GC. Clearing it here could
3239 // detectably lose an expected notification, which is impossible with
3240 // STW reference processing. The clearing in enqueue() doesn't have
3241 // this problem, since the enqueue covers the notification, but it's not
3242 // worth the effort to handle that case specially.
3243 return;
3244 }
3245 java_lang_ref_Reference::clear_referent(ref_oop);
3246 JVM_END
3247
3248
3249 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3250
3251
3252 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3253 oop ref_oop = JNIHandles::resolve_non_null(ref);
3254 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3255 return referent == JNIHandles::resolve(o);
3256 JVM_END
3257
3258
3259 // ObjectInputStream ///////////////////////////////////////////////////////////////
3260
3261 // Return the first user-defined class loader up the execution stack, or null
3262 // if only code from the bootstrap or platform class loader is on the stack.
3263
3264 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3265 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3266 InstanceKlass* ik = vfst.method()->method_holder();
3267 oop loader = ik->class_loader();
3268 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3269 // Skip reflection related frames
3270 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3271 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3272 return JNIHandles::make_local(THREAD, loader);
3273 }
3274 }
3275 }
3276 return NULL;
3277 JVM_END
3278
3279
3280 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3281
3282
3283 // resolve array handle and check arguments
3284 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3285 if (arr == NULL) {
3286 THROW_0(vmSymbols::java_lang_NullPointerException());
3287 }
3288 oop a = JNIHandles::resolve_non_null(arr);
3289 if (!a->is_array()) {
3290 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3291 } else if (type_array_only && !a->is_typeArray()) {
3292 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3293 }
3294 return arrayOop(a);
3295 }
3296
3297
3298 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3299 arrayOop a = check_array(env, arr, false, CHECK_0);
3300 return a->length();
3301 JVM_END
3302
3303
3304 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3305 JvmtiVMObjectAllocEventCollector oam;
3306 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3307 jvalue value;
3308 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3309 oop box = Reflection::box(&value, type, CHECK_NULL);
3310 return JNIHandles::make_local(THREAD, box);
3311 JVM_END
3312
3313
3314 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3315 jvalue value;
3316 value.i = 0; // to initialize value before getting used in CHECK
3317 arrayOop a = check_array(env, arr, true, CHECK_(value));
3318 assert(a->is_typeArray(), "just checking");
3319 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3320 BasicType wide_type = (BasicType) wCode;
3321 if (type != wide_type) {
3322 Reflection::widen(&value, type, wide_type, CHECK_(value));
3323 }
3324 return value;
3325 JVM_END
3326
3327
3328 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3329 arrayOop a = check_array(env, arr, false, CHECK);
3330 oop box = JNIHandles::resolve(val);
3331 jvalue value;
3332 value.i = 0; // to initialize value before getting used in CHECK
3333 BasicType value_type;
3334 if (a->is_objArray()) {
3335 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3336 value_type = Reflection::unbox_for_regular_object(box, &value);
3337 } else {
3338 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3339 }
3340 Reflection::array_set(&value, a, index, value_type, CHECK);
3341 JVM_END
3342
3343
3344 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3345 arrayOop a = check_array(env, arr, true, CHECK);
3346 assert(a->is_typeArray(), "just checking");
3347 BasicType value_type = (BasicType) vCode;
3348 Reflection::array_set(&v, a, index, value_type, CHECK);
3349 JVM_END
3350
3351
3352 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3353 JvmtiVMObjectAllocEventCollector oam;
3354 oop element_mirror = JNIHandles::resolve(eltClass);
3355 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3356 return JNIHandles::make_local(THREAD, result);
3357 JVM_END
3358
3359
3360 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3361 JvmtiVMObjectAllocEventCollector oam;
3362 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3363 oop element_mirror = JNIHandles::resolve(eltClass);
3364 assert(dim_array->is_typeArray(), "just checking");
3365 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3366 return JNIHandles::make_local(THREAD, result);
3367 JVM_END
3368
3369
3370 // Library support ///////////////////////////////////////////////////////////////////////////
3371
3372 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3373 //%note jvm_ct
3374 char ebuf[1024];
3375 void *load_result;
3376 {
3377 ThreadToNativeFromVM ttnfvm(thread);
3378 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3379 }
3380 if (load_result == NULL) {
3381 if (throwException) {
3382 char msg[1024];
3383 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3384 // Since 'ebuf' may contain a string encoded using
3385 // platform encoding scheme, we need to pass
3386 // Exceptions::unsafe_to_utf8 to the new_exception method
3387 // as the last argument. See bug 6367357.
3388 Handle h_exception =
3389 Exceptions::new_exception(thread,
3390 vmSymbols::java_lang_UnsatisfiedLinkError(),
3391 msg, Exceptions::unsafe_to_utf8);
3392
3393 THROW_HANDLE_0(h_exception);
3394 } else {
3395 log_info(library)("Failed to load library %s", name);
3396 return load_result;
3397 }
3398 }
3399 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3400 return load_result;
3401 JVM_END
3402
3403
3404 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3405 os::dll_unload(handle);
3406 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3407 JVM_END
3408
3409
3410 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3411 void* find_result = os::dll_lookup(handle, name);
3412 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3413 find_result != NULL ? "Found" : "Failed to find",
3414 name, p2i(handle));
3415 return find_result;
3416 JVM_END
3417
3418
3419 // JNI version ///////////////////////////////////////////////////////////////////////////////
3420
3421 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3422 return Threads::is_supported_jni_version_including_1_1(version);
3423 JVM_END
3424
3425
3426 // String support ///////////////////////////////////////////////////////////////////////////
3427
3428 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3429 JvmtiVMObjectAllocEventCollector oam;
3430 if (str == NULL) return NULL;
3431 oop string = JNIHandles::resolve_non_null(str);
3432 oop result = StringTable::intern(string, CHECK_NULL);
3433 return (jstring) JNIHandles::make_local(THREAD, result);
3434 JVM_END
3435
3436
3437 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3438
3439 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3440 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3441 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3442 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3443 // nature. JavaThreads will be "in native" when using this API from JDK code.
3444
3445
3446 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3447 VM_Exit::block_if_vm_exited();
3448 return new os::PlatformMutex();
3449 }
3450
3451
3452 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3453 VM_Exit::block_if_vm_exited();
3454 delete ((os::PlatformMutex*) mon);
3455 }
3456
3457
3458 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3459 VM_Exit::block_if_vm_exited();
3460 ((os::PlatformMutex*) mon)->lock();
3461 return 0;
3462 }
3463
3464
3465 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3466 VM_Exit::block_if_vm_exited();
3467 ((os::PlatformMutex*) mon)->unlock();
3468 }
3469
3470
3471 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3472
3473 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3474 Handle loader, Handle protection_domain,
3475 jboolean throwError, TRAPS) {
3476 // Security Note:
3477 // The Java level wrapper will perform the necessary security check allowing
3478 // us to pass the NULL as the initiating class loader. The VM is responsible for
3479 // the checkPackageAccess relative to the initiating class loader via the
3480 // protection_domain. The protection_domain is passed as NULL by the java code
3481 // if there is no security manager in 3-arg Class.forName().
3482 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3483
3484 // Check if we should initialize the class
3485 if (init && klass->is_instance_klass()) {
3486 klass->initialize(CHECK_NULL);
3487 }
3488 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3489 }
3490
3491
3492 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3493
3494 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3495 Handle method_handle;
3496 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3497 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3498 Handle receiver(THREAD, JNIHandles::resolve(obj));
3499 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3500 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3501 jobject res = JNIHandles::make_local(THREAD, result);
3502 if (JvmtiExport::should_post_vm_object_alloc()) {
3503 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3504 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3505 if (java_lang_Class::is_primitive(ret_type)) {
3506 // Only for primitive type vm allocates memory for java object.
3507 // See box() method.
3508 JvmtiExport::post_vm_object_alloc(thread, result);
3509 }
3510 }
3511 return res;
3512 } else {
3513 THROW_0(vmSymbols::java_lang_StackOverflowError());
3514 }
3515 JVM_END
3516
3517
3518 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3519 oop constructor_mirror = JNIHandles::resolve(c);
3520 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3521 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3522 jobject res = JNIHandles::make_local(THREAD, result);
3523 if (JvmtiExport::should_post_vm_object_alloc()) {
3524 JvmtiExport::post_vm_object_alloc(thread, result);
3525 }
3526 return res;
3527 JVM_END
3528
3529 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3530
3531 JVM_LEAF(jboolean, JVM_SupportsCX8())
3532 return VM_Version::supports_cx8();
3533 JVM_END
3534
3535 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3537 assert(k->is_klass(), "just checking");
3538 HeapShared::initialize_from_archived_subgraph(k, THREAD);
3539 JVM_END
3540
3541 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3542 jclass caller,
3543 jstring interfaceMethodName,
3544 jobject factoryType,
3545 jobject interfaceMethodType,
3546 jobject implementationMember,
3547 jobject dynamicMethodType,
3548 jclass lambdaProxyClass))
3549 #if INCLUDE_CDS
3550 if (!Arguments::is_dumping_archive()) {
3551 return;
3552 }
3553
3554 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3555 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3556 if (caller_ik->is_hidden()) {
3557 // Hidden classes not of type lambda proxy classes are currently not being archived.
3558 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3559 // registered for archiving.
3560 return;
3561 }
3562 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3563 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3564 assert(lambda_ik->is_hidden(), "must be a hidden class");
3565 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3566
3567 Symbol* interface_method_name = NULL;
3568 if (interfaceMethodName != NULL) {
3569 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3570 }
3571 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3572 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3573
3574 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3575 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3576
3577 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3578 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3579 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3580
3581 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3582 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3583
3584 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3585 interface_method_type, m, dynamic_method_type, THREAD);
3586 #endif // INCLUDE_CDS
3587 JVM_END
3588
3589 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3590 jclass caller,
3591 jstring interfaceMethodName,
3592 jobject factoryType,
3593 jobject interfaceMethodType,
3594 jobject implementationMember,
3595 jobject dynamicMethodType))
3596 #if INCLUDE_CDS
3597
3598 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3599 implementationMember == NULL || dynamicMethodType == NULL) {
3600 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3601 }
3602
3603 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3604 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3605 if (!caller_ik->is_shared()) {
3606 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3607 return NULL;
3608 }
3609
3610 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3611 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3612 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3613
3614 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3615 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3616
3617 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3618 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3619 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3620
3621 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3622 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3623
3624 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3625 interface_method_type, m, dynamic_method_type);
3626 jclass jcls = NULL;
3627 if (lambda_ik != NULL) {
3628 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3629 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3630 }
3631 return jcls;
3632 #else
3633 return NULL;
3634 #endif // INCLUDE_CDS
3635 JVM_END
3636
3637 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3638 return Arguments::is_dumping_archive();
3639 JVM_END
3640
3641 JVM_ENTRY(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3642 return UseSharedSpaces;
3643 JVM_END
3644
3645 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3646 if (DumpSharedSpaces) {
3647 const char* release = Abstract_VM_Version::vm_release();
3648 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3649 const char* version = VM_Version::internal_vm_info_string();
3650 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3651 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3652 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3653 seed += (jlong)Abstract_VM_Version::vm_major_version();
3654 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3655 seed += (jlong)Abstract_VM_Version::vm_security_version();
3656 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3657 if (seed == 0) { // don't let this ever be zero.
3658 seed = 0x87654321;
3659 }
3660 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3661 return seed;
3662 } else {
3663 return 0;
3664 }
3665 JVM_END
3666
3667 JVM_ENTRY(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3668 #if INCLUDE_CDS
3669 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3670 #else
3671 return false;
3672 #endif // INCLUDE_CDS
3673 JVM_END
3674
3675 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3676 #if INCLUDE_CDS
3677 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3678 if (line != NULL) {
3679 ResourceMark rm(THREAD);
3680 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3681 char* c_line = java_lang_String::as_utf8_string(h_line());
3682 if (DynamicDumpSharedSpaces) {
3683 // Note: LambdaFormInvokers::append_filtered and LambdaFormInvokers::append take same format which is not
3684 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3685 LambdaFormInvokers::append_filtered(os::strdup((const char*)c_line, mtInternal));
3686 }
3687 if (ClassListWriter::is_enabled()) {
3688 ClassListWriter w;
3689 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3690 }
3691 }
3692 #endif // INCLUDE_CDS
3693 JVM_END
3694
3695 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3696 #if INCLUDE_CDS
3697 ResourceMark rm(THREAD);
3698 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3699 char* file_name = java_lang_String::as_utf8_string(file_handle());
3700 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3701 #endif // INCLUDE_CDS
3702 JVM_END
3703
3704 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3705 #if INCLUDE_CDS
3706 ResourceMark rm(THREAD);
3707 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3708 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3709 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3710 #endif // INCLUDE_CDS
3711 JVM_END
3712
3713 // Returns an array of all live Thread objects (VM internal JavaThreads,
3714 // jvmti agent threads, and JNI attaching threads are skipped)
3715 // See CR 6404306 regarding JNI attaching threads
3716 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3717 ResourceMark rm(THREAD);
3718 ThreadsListEnumerator tle(THREAD, false, false);
3719 JvmtiVMObjectAllocEventCollector oam;
3720
3721 int num_threads = tle.num_threads();
3722 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3723 objArrayHandle threads_ah(THREAD, r);
3724
3725 for (int i = 0; i < num_threads; i++) {
3726 Handle h = tle.get_threadObj(i);
3727 threads_ah->obj_at_put(i, h());
3728 }
3729
3730 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3731 JVM_END
3732
3733
3734 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3735 // Return StackTraceElement[][], each element is the stack trace of a thread in
3736 // the corresponding entry in the given threads array
3737 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3738 JvmtiVMObjectAllocEventCollector oam;
3739
3740 // Check if threads is null
3741 if (threads == NULL) {
3742 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3743 }
3744
3745 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3746 objArrayHandle ah(THREAD, a);
3747 int num_threads = ah->length();
3748 // check if threads is non-empty array
3749 if (num_threads == 0) {
3750 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3751 }
3752
3753 // check if threads is not an array of objects of Thread class
3754 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3755 if (k != vmClasses::Thread_klass()) {
3756 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3757 }
3758
3759 ResourceMark rm(THREAD);
3760
3761 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3762 for (int i = 0; i < num_threads; i++) {
3763 oop thread_obj = ah->obj_at(i);
3764 instanceHandle h(THREAD, (instanceOop) thread_obj);
3765 thread_handle_array->append(h);
3766 }
3767
3768 // The JavaThread references in thread_handle_array are validated
3769 // in VM_ThreadDump::doit().
3770 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3771 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3772
3773 JVM_END
3774
3775 // JVM monitoring and management support
3776 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3777 return Management::get_jmm_interface(version);
3778 JVM_END
3779
3780 // com.sun.tools.attach.VirtualMachine agent properties support
3781 //
3782 // Initialize the agent properties with the properties maintained in the VM
3783 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3784 ResourceMark rm;
3785
3786 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3787
3788 PUTPROP(props, "sun.java.command", Arguments::java_command());
3789 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3790 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3791 return properties;
3792 JVM_END
3793
3794 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3795 {
3796 JvmtiVMObjectAllocEventCollector oam;
3797
3798 if (ofClass == NULL) {
3799 return NULL;
3800 }
3801 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3802 // Special handling for primitive objects
3803 if (java_lang_Class::is_primitive(mirror())) {
3804 return NULL;
3805 }
3806 Klass* k = java_lang_Class::as_Klass(mirror());
3807 if (!k->is_instance_klass()) {
3808 return NULL;
3809 }
3810 InstanceKlass* ik = InstanceKlass::cast(k);
3811 int encl_method_class_idx = ik->enclosing_method_class_index();
3812 if (encl_method_class_idx == 0) {
3813 return NULL;
3814 }
3815 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3816 objArrayHandle dest(THREAD, dest_o);
3817 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3818 dest->obj_at_put(0, enc_k->java_mirror());
3819 int encl_method_method_idx = ik->enclosing_method_method_index();
3820 if (encl_method_method_idx != 0) {
3821 Symbol* sym = ik->constants()->symbol_at(
3822 extract_low_short_from_int(
3823 ik->constants()->name_and_type_at(encl_method_method_idx)));
3824 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3825 dest->obj_at_put(1, str());
3826 sym = ik->constants()->symbol_at(
3827 extract_high_short_from_int(
3828 ik->constants()->name_and_type_at(encl_method_method_idx)));
3829 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3830 dest->obj_at_put(2, str());
3831 }
3832 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3833 }
3834 JVM_END
3835
3836 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3837 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3838 ResourceMark rm(THREAD);
3839
3840 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3841 return NULL;
3842 }
3843
3844 char** vm_flags = Arguments::jvm_flags_array();
3845 char** vm_args = Arguments::jvm_args_array();
3846 int num_flags = Arguments::num_jvm_flags();
3847 int num_args = Arguments::num_jvm_args();
3848
3849 InstanceKlass* ik = vmClasses::String_klass();
3850 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3851 objArrayHandle result_h(THREAD, r);
3852
3853 int index = 0;
3854 for (int j = 0; j < num_flags; j++, index++) {
3855 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3856 result_h->obj_at_put(index, h());
3857 }
3858 for (int i = 0; i < num_args; i++, index++) {
3859 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3860 result_h->obj_at_put(index, h());
3861 }
3862 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3863 JVM_END
3864
3865 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3866 return os::get_signal_number(name);
3867 JVM_END
3868