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