1 /*
2 * Copyright (c) 1997, 2018, 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 "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/referenceType.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/access.inline.hpp"
45 #include "oops/fieldStreams.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/method.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvm_misc.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "prims/nativeLookup.hpp"
55 #include "prims/privilegedStack.hpp"
56 #include "prims/stackwalk.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.inline.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/jfieldIDWorkaround.hpp"
65 #include "runtime/jniHandles.inline.hpp"
66 #include "runtime/orderAccess.inline.hpp"
67 #include "runtime/os.inline.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadSMR.hpp"
72 #include "runtime/vframe.inline.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/attachListener.hpp"
76 #include "services/management.hpp"
77 #include "services/threadService.hpp"
78 #include "trace/tracing.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/defaultStream.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/histogram.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/utf8.hpp"
86 #if INCLUDE_CDS
87 #include "classfile/sharedClassUtil.hpp"
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90
91 #include <errno.h>
92
93 /*
94 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
95 such ctors and calls MUST NOT come between an oop declaration/init and its
96 usage because if objects are move this may cause various memory stomps, bus
97 errors and segfaults. Here is a cookbook for causing so called "naked oop
98 failures":
99
100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
101 JVMWrapper("JVM_GetClassDeclaredFields");
102
103 // Object address to be held directly in mirror & not visible to GC
104 oop mirror = JNIHandles::resolve_non_null(ofClass);
105
106 // If this ctor can hit a safepoint, moving objects around, then
107 ComplexConstructor foo;
108
109 // Boom! mirror may point to JUNK instead of the intended object
110 (some dereference of mirror)
111
112 // Here's another call that may block for GC, making mirror stale
113 MutexLocker ml(some_lock);
114
115 // And here's an initializer that can result in a stale oop
116 // all in one step.
117 oop o = call_that_can_throw_exception(TRAPS);
118
119
120 The solution is to keep the oop declaration BELOW the ctor or function
121 call that might cause a GC, do another resolve to reassign the oop, or
122 consider use of a Handle instead of an oop so there is immunity from object
123 motion. But note that the "QUICK" entries below do not have a handlemark
124 and thus can only support use of handles passed in.
125 */
126
127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
128 ResourceMark rm;
129 int line_number = -1;
130 const char * source_file = NULL;
131 const char * trace = "explicit";
132 InstanceKlass* caller = NULL;
133 JavaThread* jthread = JavaThread::current();
134 if (jthread->has_last_Java_frame()) {
135 vframeStream vfst(jthread);
136
137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
142
143 Method* last_caller = NULL;
144
145 while (!vfst.at_end()) {
146 Method* m = vfst.method();
147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
150 break;
151 }
152 last_caller = m;
153 vfst.next();
154 }
155 // if this is called from Class.forName0 and that is called from Class.forName,
156 // then print the caller of Class.forName. If this is Class.loadClass, then print
157 // that caller, otherwise keep quiet since this should be picked up elsewhere.
158 bool found_it = false;
159 if (!vfst.at_end() &&
160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
161 vfst.method()->name() == vmSymbols::forName0_name()) {
162 vfst.next();
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName_name()) {
166 vfst.next();
167 found_it = true;
168 }
169 } else if (last_caller != NULL &&
170 last_caller->method_holder()->name() ==
171 vmSymbols::java_lang_ClassLoader() &&
172 last_caller->name() == vmSymbols::loadClass_name()) {
173 found_it = true;
174 } else if (!vfst.at_end()) {
175 if (vfst.method()->is_native()) {
176 // JNI call
177 found_it = true;
178 }
179 }
180 if (found_it && !vfst.at_end()) {
181 // found the caller
182 caller = vfst.method()->method_holder();
183 line_number = vfst.method()->line_number_from_bci(vfst.bci());
184 if (line_number == -1) {
185 // show method name if it's a native method
186 trace = vfst.method()->name_and_sig_as_C_string();
187 }
188 Symbol* s = caller->source_file_name();
189 if (s != NULL) {
190 source_file = s->as_C_string();
191 }
192 }
193 }
194 if (caller != NULL) {
195 if (to_class != caller) {
196 const char * from = caller->external_name();
197 const char * to = to_class->external_name();
198 // print in a single call to reduce interleaving between threads
199 if (source_file != NULL) {
200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
201 } else {
202 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
203 }
204 }
205 }
206 }
207
208 void trace_class_resolution(Klass* to_class) {
209 EXCEPTION_MARK;
210 trace_class_resolution_impl(to_class, THREAD);
211 if (HAS_PENDING_EXCEPTION) {
212 CLEAR_PENDING_EXCEPTION;
213 }
214 }
215
216 // Wrapper to trace JVM functions
217
218 #ifdef ASSERT
219 Histogram* JVMHistogram;
220 volatile int JVMHistogram_lock = 0;
221
222 class JVMHistogramElement : public HistogramElement {
223 public:
224 JVMHistogramElement(const char* name);
225 };
226
227 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
230
231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JVMHistogram_lock seems to be stalled");
237 }
238 }
239 }
240
241 if(JVMHistogram == NULL)
242 JVMHistogram = new Histogram("JVM Call Counts",100);
243
244 JVMHistogram->add_element(this);
245 Atomic::dec(&JVMHistogram_lock);
246 }
247
248 #define JVMCountWrapper(arg) \
249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
251
252 #define JVMWrapper(arg) JVMCountWrapper(arg);
253 #else
254 #define JVMWrapper(arg)
255 #endif
256
257
258 // Interface version /////////////////////////////////////////////////////////////////////
259
260
261 JVM_LEAF(jint, JVM_GetInterfaceVersion())
262 return JVM_INTERFACE_VERSION;
263 JVM_END
264
265
266 // java.lang.System //////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
270 JVMWrapper("JVM_CurrentTimeMillis");
271 return os::javaTimeMillis();
272 JVM_END
273
274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_NanoTime");
276 return os::javaTimeNanos();
277 JVM_END
278
279 // The function below is actually exposed by jdk.internal.misc.VM and not
280 // java.lang.System, but we choose to keep it here so that it stays next
281 // to JVM_CurrentTimeMillis and JVM_NanoTime
282
283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
285
286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
287 JVMWrapper("JVM_GetNanoTimeAdjustment");
288 jlong seconds;
289 jlong nanos;
290
291 os::javaTimeSystemUTC(seconds, nanos);
292
293 // We're going to verify that the result can fit in a long.
294 // For that we need the difference in seconds between 'seconds'
295 // and 'offset_secs' to be such that:
296 // |seconds - offset_secs| < (2^63/10^9)
297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
298 // which makes |seconds - offset_secs| < 2^33
299 // and we will prefer +/- 2^32 as the maximum acceptable diff
300 // as 2^32 has a more natural feel than 2^33...
301 //
302 // So if |seconds - offset_secs| >= 2^32 - we return a special
303 // sentinel value (-1) which the caller should take as an
304 // exception value indicating that the offset given to us is
305 // too far from range of the current time - leading to too big
306 // a nano adjustment. The caller is expected to recover by
307 // computing a more accurate offset and calling this method
308 // again. (For the record 2^32 secs is ~136 years, so that
309 // should rarely happen)
310 //
311 jlong diff = seconds - offset_secs;
312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
313 return -1; // sentinel value: the offset is too far off the target
314 }
315
316 // return the adjustment. If you compute a time by adding
317 // this number of nanoseconds along with the number of seconds
318 // in the offset you should get the current UTC time.
319 return (diff * (jlong)1000000000) + nanos;
320 JVM_END
321
322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
323 jobject dst, jint dst_pos, jint length))
324 JVMWrapper("JVM_ArrayCopy");
325 // Check if we have null pointers
326 if (src == NULL || dst == NULL) {
327 THROW(vmSymbols::java_lang_NullPointerException());
328 }
329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
333 // Do copy
334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
335 JVM_END
336
337
338 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
339 JavaValue r(T_OBJECT);
340 // public synchronized Object put(Object key, Object value);
341 HandleMark hm(THREAD);
342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
344 JavaCalls::call_virtual(&r,
345 props,
346 SystemDictionary::Properties_klass(),
347 vmSymbols::put_name(),
348 vmSymbols::object_object_object_signature(),
349 key_str,
350 value_str,
351 THREAD);
352 }
353
354
355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
356
357
358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
359 JVMWrapper("JVM_InitProperties");
360 ResourceMark rm;
361
362 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
363
364 // System property list includes both user set via -D option and
365 // jvm system specific properties.
366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
367 PUTPROP(props, p->key(), p->value());
368 }
369
370 // Convert the -XX:MaxDirectMemorySize= command line flag
371 // to the sun.nio.MaxDirectMemorySize property.
372 // Do this after setting user properties to prevent people
373 // from setting the value with a -D option, as requested.
374 {
375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
377 } else {
378 char as_chars[256];
379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
381 }
382 }
383
384 // JVM monitoring and management support
385 // Add the sun.management.compiler property for the compiler's name
386 {
387 #undef CSIZE
388 #if defined(_LP64) || defined(_WIN64)
389 #define CSIZE "64-Bit "
390 #else
391 #define CSIZE
392 #endif // 64bit
393
394 #ifdef TIERED
395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
396 #else
397 #if defined(COMPILER1)
398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
399 #elif defined(COMPILER2)
400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
401 #elif INCLUDE_JVMCI
402 #error "INCLUDE_JVMCI should imply TIERED"
403 #else
404 const char* compiler_name = "";
405 #endif // compilers
406 #endif // TIERED
407
408 if (*compiler_name != '\0' &&
409 (Arguments::mode() != Arguments::_int)) {
410 PUTPROP(props, "sun.management.compiler", compiler_name);
411 }
412 }
413
414 return properties;
415 JVM_END
416
417
418 /*
419 * Return the temporary directory that the VM uses for the attach
420 * and perf data files.
421 *
422 * It is important that this directory is well-known and the
423 * same for all VM instances. It cannot be affected by configuration
424 * variables such as java.io.tmpdir.
425 */
426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
427 JVMWrapper("JVM_GetTemporaryDirectory");
428 HandleMark hm(THREAD);
429 const char* temp_dir = os::get_temp_directory();
430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
431 return (jstring) JNIHandles::make_local(env, h());
432 JVM_END
433
434
435 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
436
437 extern volatile jint vm_created;
438
439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
440 JVMWrapper("JVM_BeforeHalt");
441 EventShutdown event;
442 if (event.should_commit()) {
443 event.set_reason("Shutdown requested from Java");
444 event.commit();
445 }
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
450 before_exit(thread);
451 vm_exit(code);
452 JVM_END
453
454
455 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
456 JVMWrapper("JVM_GC");
457 if (!DisableExplicitGC) {
458 Universe::heap()->collect(GCCause::_java_lang_system_gc);
459 }
460 JVM_END
461
462
463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
464 JVMWrapper("JVM_MaxObjectInspectionAge");
465 return Universe::heap()->millis_since_last_gc();
466 JVM_END
467
468
469 static inline jlong convert_size_t_to_jlong(size_t val) {
470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
471 NOT_LP64 (return (jlong)val;)
472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
473 }
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
476 JVMWrapper("JVM_TotalMemory");
477 size_t n = Universe::heap()->capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
483 JVMWrapper("JVM_FreeMemory");
484 CollectedHeap* ch = Universe::heap();
485 size_t n;
486 {
487 MutexLocker x(Heap_lock);
488 n = ch->capacity() - ch->used();
489 }
490 return convert_size_t_to_jlong(n);
491 JVM_END
492
493
494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
495 JVMWrapper("JVM_MaxMemory");
496 size_t n = Universe::heap()->max_capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
502 JVMWrapper("JVM_ActiveProcessorCount");
503 return os::active_processor_count();
504 JVM_END
505
506
507
508 // java.lang.Throwable //////////////////////////////////////////////////////
509
510
511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
512 JVMWrapper("JVM_FillInStackTrace");
513 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
514 java_lang_Throwable::fill_in_stack_trace(exception);
515 JVM_END
516
517
518 // java.lang.StackTraceElement //////////////////////////////////////////////
519
520
521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
522 JVMWrapper("JVM_InitStackTraceElementArray");
523 Handle exception(THREAD, JNIHandles::resolve(throwable));
524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
525 objArrayHandle stack_trace(THREAD, st);
526 // Fill in the allocated stack trace
527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
532 JVMWrapper("JVM_InitStackTraceElement");
533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
536 JVM_END
537
538
539 // java.lang.StackWalker //////////////////////////////////////////////////////
540
541
542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
543 jint skip_frames, jint frame_count, jint start_index,
544 jobjectArray frames))
545 JVMWrapper("JVM_CallStackWalk");
546 JavaThread* jt = (JavaThread*) THREAD;
547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
549 }
550
551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
552
553 // frames array is a Class<?>[] array when only getting caller reference,
554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
555 // be null.
556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
557 objArrayHandle frames_array_h(THREAD, fa);
558
559 int limit = start_index + frame_count;
560 if (frames_array_h->length() < limit) {
561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
562 }
563
564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
565 start_index, frames_array_h, CHECK_NULL);
566 return JNIHandles::make_local(env, result);
567 JVM_END
568
569
570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
571 jint frame_count, jint start_index,
572 jobjectArray frames))
573 JVMWrapper("JVM_MoreStackWalk");
574 JavaThread* jt = (JavaThread*) THREAD;
575
576 // frames array is a Class<?>[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 int limit = start_index+frame_count;
583 if (frames_array_h->length() < limit) {
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
589 start_index, frames_array_h, THREAD);
590 JVM_END
591
592 // java.lang.Object ///////////////////////////////////////////////
593
594
595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
596 JVMWrapper("JVM_IHashCode");
597 // as implemented in the classic virtual machine; return 0 if object is NULL
598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
599 JVM_END
600
601
602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
603 JVMWrapper("JVM_MonitorWait");
604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
605 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
606 if (JvmtiExport::should_post_monitor_wait()) {
607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
608
609 // The current thread already owns the monitor and it has not yet
610 // been added to the wait queue so the current thread cannot be
611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
612 // event handler cannot accidentally consume an unpark() meant for
613 // the ParkEvent associated with this ObjectMonitor.
614 }
615 ObjectSynchronizer::wait(obj, ms, CHECK);
616 JVM_END
617
618
619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_MonitorNotify");
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 ObjectSynchronizer::notify(obj, CHECK);
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
627 JVMWrapper("JVM_MonitorNotifyAll");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 ObjectSynchronizer::notifyall(obj, CHECK);
630 JVM_END
631
632
633 template<DecoratorSet decorators>
634 static void fixup_clone_referent(oop src, oop new_obj) {
635 typedef HeapAccess<decorators> RefAccess;
636 const int ref_offset = java_lang_ref_Reference::referent_offset;
637 oop referent = RefAccess::oop_load_at(src, ref_offset);
638 RefAccess::oop_store_at(new_obj, ref_offset, referent);
639 }
640
641 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) {
642 // Kludge: After unbarriered clone, re-copy the referent with
643 // correct barriers. This works for current collectors, but won't
644 // work for ZGC and maybe other future collectors or variants of
645 // existing ones (like G1 with concurrent reference processing).
646 if (ref_type == REF_PHANTOM) {
647 fixup_clone_referent<ON_PHANTOM_OOP_REF>(src, clone);
648 } else {
649 fixup_clone_referent<ON_WEAK_OOP_REF>(src, clone);
650 }
651 if ((java_lang_ref_Reference::next(clone) != NULL) ||
652 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
653 // If the source has been enqueued or is being enqueued, don't
654 // register the clone with a queue.
655 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
656 }
657 // discovered and next are list links; the clone is not in those lists.
658 java_lang_ref_Reference::set_discovered(clone, NULL);
659 java_lang_ref_Reference::set_next(clone, NULL);
660 }
661
662 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
663 JVMWrapper("JVM_Clone");
664 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
665 Klass* klass = obj->klass();
666 JvmtiVMObjectAllocEventCollector oam;
667
668 #ifdef ASSERT
669 // Just checking that the cloneable flag is set correct
670 if (obj->is_array()) {
671 guarantee(klass->is_cloneable(), "all arrays are cloneable");
672 } else {
673 guarantee(obj->is_instance(), "should be instanceOop");
674 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
675 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
676 }
677 #endif
678
679 // Check if class of obj supports the Cloneable interface.
680 // All arrays are considered to be cloneable (See JLS 20.1.5)
681 if (!klass->is_cloneable()) {
682 ResourceMark rm(THREAD);
683 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
684 }
685
686 // Make shallow object copy
687 ReferenceType ref_type = REF_NONE;
688 const int size = obj->size();
689 oop new_obj_oop = NULL;
690 if (obj->is_array()) {
691 const int length = ((arrayOop)obj())->length();
692 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
693 } else {
694 ref_type = InstanceKlass::cast(klass)->reference_type();
695 assert((ref_type == REF_NONE) ==
696 !klass->is_subclass_of(SystemDictionary::Reference_klass()),
697 "invariant");
698 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
699 }
700
701 HeapAccess<>::clone(obj(), new_obj_oop, size);
702
703 // If cloning a Reference, set Reference fields to a safe state.
704 // Fixup must be completed before any safepoint.
705 if (ref_type != REF_NONE) {
706 fixup_cloned_reference(ref_type, obj(), new_obj_oop);
707 }
708
709 Handle new_obj(THREAD, new_obj_oop);
710 // Caution: this involves a java upcall, so the clone should be
711 // "gc-robust" by this stage.
712 if (klass->has_finalizer()) {
713 assert(obj->is_instance(), "should be instanceOop");
714 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
715 new_obj = Handle(THREAD, new_obj_oop);
716 }
717
718 return JNIHandles::make_local(env, new_obj());
719 JVM_END
720
721 // java.io.File ///////////////////////////////////////////////////////////////
722
723 JVM_LEAF(char*, JVM_NativePath(char* path))
724 JVMWrapper("JVM_NativePath");
725 return os::native_path(path);
726 JVM_END
727
728
729 // Misc. class handling ///////////////////////////////////////////////////////////
730
731
732 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
733 JVMWrapper("JVM_GetCallerClass");
734
735 // Getting the class of the caller frame.
736 //
737 // The call stack at this point looks something like this:
738 //
739 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
740 // [1] [ @CallerSensitive API.method ]
741 // [.] [ (skipped intermediate frames) ]
742 // [n] [ caller ]
743 vframeStream vfst(thread);
744 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
745 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
746 Method* m = vfst.method();
747 assert(m != NULL, "sanity");
748 switch (n) {
749 case 0:
750 // This must only be called from Reflection.getCallerClass
751 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
752 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
753 }
754 // fall-through
755 case 1:
756 // Frame 0 and 1 must be caller sensitive.
757 if (!m->caller_sensitive()) {
758 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
759 }
760 break;
761 default:
762 if (!m->is_ignored_by_security_stack_walk()) {
763 // We have reached the desired frame; return the holder class.
764 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
765 }
766 break;
767 }
768 }
769 return NULL;
770 JVM_END
771
772
773 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
774 JVMWrapper("JVM_FindPrimitiveClass");
775 oop mirror = NULL;
776 BasicType t = name2type(utf);
777 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
778 mirror = Universe::java_mirror(t);
779 }
780 if (mirror == NULL) {
781 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
782 } else {
783 return (jclass) JNIHandles::make_local(env, mirror);
784 }
785 JVM_END
786
787
788 // Returns a class loaded by the bootstrap class loader; or null
789 // if not found. ClassNotFoundException is not thrown.
790 // FindClassFromBootLoader is exported to the launcher for windows.
791 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
792 const char* name))
793 JVMWrapper("JVM_FindClassFromBootLoader");
794
795 // Java libraries should ensure that name is never null...
796 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
797 // It's impossible to create this class; the name cannot fit
798 // into the constant pool.
799 return NULL;
800 }
801
802 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
803 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
804 if (k == NULL) {
805 return NULL;
806 }
807
808 if (log_is_enabled(Debug, class, resolve)) {
809 trace_class_resolution(k);
810 }
811 return (jclass) JNIHandles::make_local(env, k->java_mirror());
812 JVM_END
813
814 // Find a class with this name in this loader, using the caller's protection domain.
815 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
816 jboolean init, jobject loader,
817 jclass caller))
818 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
819 // Java libraries should ensure that name is never null...
820 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
821 // It's impossible to create this class; the name cannot fit
822 // into the constant pool.
823 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
824 }
825
826 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
827
828 oop loader_oop = JNIHandles::resolve(loader);
829 oop from_class = JNIHandles::resolve(caller);
830 oop protection_domain = NULL;
831 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
832 // NPE. Put it in another way, the bootstrap class loader has all permission and
833 // thus no checkPackageAccess equivalence in the VM class loader.
834 // The caller is also passed as NULL by the java code if there is no security
835 // manager to avoid the performance cost of getting the calling class.
836 if (from_class != NULL && loader_oop != NULL) {
837 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
838 }
839
840 Handle h_loader(THREAD, loader_oop);
841 Handle h_prot(THREAD, protection_domain);
842 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
843 h_prot, false, THREAD);
844
845 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
846 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
847 }
848 return result;
849 JVM_END
850
851 // Currently only called from the old verifier.
852 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
853 jboolean init, jclass from))
854 JVMWrapper("JVM_FindClassFromClass");
855 if (name == NULL) {
856 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
857 }
858 if ((int)strlen(name) > Symbol::max_length()) {
859 // It's impossible to create this class; the name cannot fit
860 // into the constant pool.
861 Exceptions::fthrow(THREAD_AND_LOCATION,
862 vmSymbols::java_lang_NoClassDefFoundError(),
863 "Class name exceeds maximum length of %d: %s",
864 Symbol::max_length(),
865 name);
866 return 0;
867 }
868 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
869 oop from_class_oop = JNIHandles::resolve(from);
870 Klass* from_class = (from_class_oop == NULL)
871 ? (Klass*)NULL
872 : java_lang_Class::as_Klass(from_class_oop);
873 oop class_loader = NULL;
874 oop protection_domain = NULL;
875 if (from_class != NULL) {
876 class_loader = from_class->class_loader();
877 protection_domain = from_class->protection_domain();
878 }
879 Handle h_loader(THREAD, class_loader);
880 Handle h_prot (THREAD, protection_domain);
881 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
882 h_prot, true, thread);
883 if (result != NULL) {
884 oop mirror = JNIHandles::resolve_non_null(result);
885 Klass* to_class = java_lang_Class::as_Klass(mirror);
886 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
887 }
888
889 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
890 // this function is generally only used for class loading during verification.
891 ResourceMark rm;
892 oop from_mirror = JNIHandles::resolve_non_null(from);
893 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
894 const char * from_name = from_class->external_name();
895
896 oop mirror = JNIHandles::resolve_non_null(result);
897 Klass* to_class = java_lang_Class::as_Klass(mirror);
898 const char * to = to_class->external_name();
899 log_debug(class, resolve)("%s %s (verification)", from_name, to);
900 }
901
902 return result;
903 JVM_END
904
905 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
906 if (loader.is_null()) {
907 return;
908 }
909
910 // check whether the current caller thread holds the lock or not.
911 // If not, increment the corresponding counter
912 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
913 ObjectSynchronizer::owner_self) {
914 counter->inc();
915 }
916 }
917
918 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
919 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
920 jobject loader, const jbyte *buf,
921 jsize len, jobject pd, const char *source,
922 TRAPS) {
923 if (source == NULL) source = "__JVM_DefineClass__";
924
925 assert(THREAD->is_Java_thread(), "must be a JavaThread");
926 JavaThread* jt = (JavaThread*) THREAD;
927
928 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
929 ClassLoader::perf_define_appclass_selftime(),
930 ClassLoader::perf_define_appclasses(),
931 jt->get_thread_stat()->perf_recursion_counts_addr(),
932 jt->get_thread_stat()->perf_timers_addr(),
933 PerfClassTraceTime::DEFINE_CLASS);
934
935 if (UsePerfData) {
936 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
937 }
938
939 // Since exceptions can be thrown, class initialization can take place
940 // if name is NULL no check for class name in .class stream has to be made.
941 TempNewSymbol class_name = NULL;
942 if (name != NULL) {
943 const int str_len = (int)strlen(name);
944 if (str_len > Symbol::max_length()) {
945 // It's impossible to create this class; the name cannot fit
946 // into the constant pool.
947 Exceptions::fthrow(THREAD_AND_LOCATION,
948 vmSymbols::java_lang_NoClassDefFoundError(),
949 "Class name exceeds maximum length of %d: %s",
950 Symbol::max_length(),
951 name);
952 return 0;
953 }
954 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
955 }
956
957 ResourceMark rm(THREAD);
958 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
959 Handle class_loader (THREAD, JNIHandles::resolve(loader));
960 if (UsePerfData) {
961 is_lock_held_by_thread(class_loader,
962 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
963 THREAD);
964 }
965 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
966 Klass* k = SystemDictionary::resolve_from_stream(class_name,
967 class_loader,
968 protection_domain,
969 &st,
970 CHECK_NULL);
971
972 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
973 trace_class_resolution(k);
974 }
975
976 return (jclass) JNIHandles::make_local(env, k->java_mirror());
977 }
978
979
980 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
981 JVMWrapper("JVM_DefineClass");
982
983 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
984 JVM_END
985
986
987 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
988 JVMWrapper("JVM_DefineClassWithSource");
989
990 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
991 JVM_END
992
993 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
994 JVMWrapper("JVM_FindLoadedClass");
995 ResourceMark rm(THREAD);
996
997 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
998 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
999
1000 const char* str = java_lang_String::as_utf8_string(string());
1001 // Sanity check, don't expect null
1002 if (str == NULL) return NULL;
1003
1004 const int str_len = (int)strlen(str);
1005 if (str_len > Symbol::max_length()) {
1006 // It's impossible to create this class; the name cannot fit
1007 // into the constant pool.
1008 return NULL;
1009 }
1010 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1011
1012 // Security Note:
1013 // The Java level wrapper will perform the necessary security check allowing
1014 // us to pass the NULL as the initiating class loader.
1015 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1016 if (UsePerfData) {
1017 is_lock_held_by_thread(h_loader,
1018 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1019 THREAD);
1020 }
1021
1022 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1023 h_loader,
1024 Handle(),
1025 CHECK_NULL);
1026 #if INCLUDE_CDS
1027 if (k == NULL) {
1028 // If the class is not already loaded, try to see if it's in the shared
1029 // archive for the current classloader (h_loader).
1030 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1031 }
1032 #endif
1033 return (k == NULL) ? NULL :
1034 (jclass) JNIHandles::make_local(env, k->java_mirror());
1035 JVM_END
1036
1037 // Module support //////////////////////////////////////////////////////////////////////////////
1038
1039 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1040 jstring location, const char* const* packages, jsize num_packages))
1041 JVMWrapper("JVM_DefineModule");
1042 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1043 JVM_END
1044
1045 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1046 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1047 Modules::set_bootloader_unnamed_module(module, CHECK);
1048 JVM_END
1049
1050 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1051 JVMWrapper("JVM_AddModuleExports");
1052 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1053 JVM_END
1054
1055 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1056 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1057 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1058 JVM_END
1059
1060 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1061 JVMWrapper("JVM_AddModuleExportsToAll");
1062 Modules::add_module_exports(from_module, package, NULL, CHECK);
1063 JVM_END
1064
1065 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1066 JVMWrapper("JVM_AddReadsModule");
1067 Modules::add_reads_module(from_module, source_module, CHECK);
1068 JVM_END
1069
1070 // Reflection support //////////////////////////////////////////////////////////////////////////////
1071
1072 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1073 assert (cls != NULL, "illegal class");
1074 JVMWrapper("JVM_GetClassName");
1075 JvmtiVMObjectAllocEventCollector oam;
1076 ResourceMark rm(THREAD);
1077 const char* name;
1078 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1079 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1080 } else {
1081 // Consider caching interned string in Klass
1082 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1083 assert(k->is_klass(), "just checking");
1084 name = k->external_name();
1085 }
1086 oop result = StringTable::intern((char*) name, CHECK_NULL);
1087 return (jstring) JNIHandles::make_local(env, result);
1088 JVM_END
1089
1090
1091 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1092 JVMWrapper("JVM_GetClassInterfaces");
1093 JvmtiVMObjectAllocEventCollector oam;
1094 oop mirror = JNIHandles::resolve_non_null(cls);
1095
1096 // Special handling for primitive objects
1097 if (java_lang_Class::is_primitive(mirror)) {
1098 // Primitive objects does not have any interfaces
1099 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1100 return (jobjectArray) JNIHandles::make_local(env, r);
1101 }
1102
1103 Klass* klass = java_lang_Class::as_Klass(mirror);
1104 // Figure size of result array
1105 int size;
1106 if (klass->is_instance_klass()) {
1107 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1108 } else {
1109 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1110 size = 2;
1111 }
1112
1113 // Allocate result array
1114 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1115 objArrayHandle result (THREAD, r);
1116 // Fill in result
1117 if (klass->is_instance_klass()) {
1118 // Regular instance klass, fill in all local interfaces
1119 for (int index = 0; index < size; index++) {
1120 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1121 result->obj_at_put(index, k->java_mirror());
1122 }
1123 } else {
1124 // All arrays implement java.lang.Cloneable and java.io.Serializable
1125 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1126 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1127 }
1128 return (jobjectArray) JNIHandles::make_local(env, result());
1129 JVM_END
1130
1131
1132 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1133 JVMWrapper("JVM_IsInterface");
1134 oop mirror = JNIHandles::resolve_non_null(cls);
1135 if (java_lang_Class::is_primitive(mirror)) {
1136 return JNI_FALSE;
1137 }
1138 Klass* k = java_lang_Class::as_Klass(mirror);
1139 jboolean result = k->is_interface();
1140 assert(!result || k->is_instance_klass(),
1141 "all interfaces are instance types");
1142 // The compiler intrinsic for isInterface tests the
1143 // Klass::_access_flags bits in the same way.
1144 return result;
1145 JVM_END
1146
1147
1148 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1149 JVMWrapper("JVM_GetClassSigners");
1150 JvmtiVMObjectAllocEventCollector oam;
1151 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1152 // There are no signers for primitive types
1153 return NULL;
1154 }
1155
1156 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1157
1158 // If there are no signers set in the class, or if the class
1159 // is an array, return NULL.
1160 if (signers == NULL) return NULL;
1161
1162 // copy of the signers array
1163 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1164 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1165 for (int index = 0; index < signers->length(); index++) {
1166 signers_copy->obj_at_put(index, signers->obj_at(index));
1167 }
1168
1169 // return the copy
1170 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1171 JVM_END
1172
1173
1174 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1175 JVMWrapper("JVM_SetClassSigners");
1176 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1177 // This call is ignored for primitive types and arrays.
1178 // Signers are only set once, ClassLoader.java, and thus shouldn't
1179 // be called with an array. Only the bootstrap loader creates arrays.
1180 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1181 if (k->is_instance_klass()) {
1182 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1183 }
1184 }
1185 JVM_END
1186
1187
1188 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1189 JVMWrapper("JVM_GetProtectionDomain");
1190 if (JNIHandles::resolve(cls) == NULL) {
1191 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1192 }
1193
1194 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1195 // Primitive types does not have a protection domain.
1196 return NULL;
1197 }
1198
1199 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1200 return (jobject) JNIHandles::make_local(env, pd);
1201 JVM_END
1202
1203
1204 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1205 // If there is a security manager and protection domain, check the access
1206 // in the protection domain, otherwise it is authorized.
1207 if (java_lang_System::has_security_manager()) {
1208
1209 // For bootstrapping, if pd implies method isn't in the JDK, allow
1210 // this context to revert to older behavior.
1211 // In this case the isAuthorized field in AccessControlContext is also not
1212 // present.
1213 if (Universe::protection_domain_implies_method() == NULL) {
1214 return true;
1215 }
1216
1217 // Whitelist certain access control contexts
1218 if (java_security_AccessControlContext::is_authorized(context)) {
1219 return true;
1220 }
1221
1222 oop prot = klass->protection_domain();
1223 if (prot != NULL) {
1224 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1225 // in the new wrapper.
1226 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1227 Handle h_prot(THREAD, prot);
1228 JavaValue result(T_BOOLEAN);
1229 JavaCallArguments args(h_prot);
1230 JavaCalls::call(&result, m, &args, CHECK_false);
1231 return (result.get_jboolean() != 0);
1232 }
1233 }
1234 return true;
1235 }
1236
1237 // Create an AccessControlContext with a protection domain with null codesource
1238 // and null permissions - which gives no permissions.
1239 oop create_dummy_access_control_context(TRAPS) {
1240 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1241 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1242 // Call constructor ProtectionDomain(null, null);
1243 JavaValue result(T_VOID);
1244 JavaCalls::call_special(&result, obj, pd_klass,
1245 vmSymbols::object_initializer_name(),
1246 vmSymbols::codesource_permissioncollection_signature(),
1247 Handle(), Handle(), CHECK_NULL);
1248
1249 // new ProtectionDomain[] {pd};
1250 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1251 context->obj_at_put(0, obj());
1252
1253 // new AccessControlContext(new ProtectionDomain[] {pd})
1254 objArrayHandle h_context(THREAD, context);
1255 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1256 return acc;
1257 }
1258
1259 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1260 JVMWrapper("JVM_DoPrivileged");
1261
1262 if (action == NULL) {
1263 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1264 }
1265
1266 // Compute the frame initiating the do privileged operation and setup the privileged stack
1267 vframeStream vfst(thread);
1268 vfst.security_get_caller_frame(1);
1269
1270 if (vfst.at_end()) {
1271 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1272 }
1273
1274 Method* method = vfst.method();
1275 InstanceKlass* klass = method->method_holder();
1276
1277 // Check that action object understands "Object run()"
1278 Handle h_context;
1279 if (context != NULL) {
1280 h_context = Handle(THREAD, JNIHandles::resolve(context));
1281 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1282 if (!authorized) {
1283 // Create an unprivileged access control object and call it's run function
1284 // instead.
1285 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1286 h_context = Handle(THREAD, noprivs);
1287 }
1288 }
1289
1290 // Check that action object understands "Object run()"
1291 Handle object (THREAD, JNIHandles::resolve(action));
1292
1293 // get run() method
1294 Method* m_oop = object->klass()->uncached_lookup_method(
1295 vmSymbols::run_method_name(),
1296 vmSymbols::void_object_signature(),
1297 Klass::find_overpass);
1298
1299 // See if there is a default method for "Object run()".
1300 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1301 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1302 m_oop = iklass->lookup_method_in_ordered_interfaces(
1303 vmSymbols::run_method_name(),
1304 vmSymbols::void_object_signature());
1305 }
1306
1307 methodHandle m (THREAD, m_oop);
1308 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1309 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1310 }
1311
1312 // Stack allocated list of privileged stack elements
1313 PrivilegedElement pi;
1314 if (!vfst.at_end()) {
1315 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1316 thread->set_privileged_stack_top(&pi);
1317 }
1318
1319
1320 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1321 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1322 Handle pending_exception;
1323 JavaValue result(T_OBJECT);
1324 JavaCallArguments args(object);
1325 JavaCalls::call(&result, m, &args, THREAD);
1326
1327 // done with action, remove ourselves from the list
1328 if (!vfst.at_end()) {
1329 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1330 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1331 }
1332
1333 if (HAS_PENDING_EXCEPTION) {
1334 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1335 CLEAR_PENDING_EXCEPTION;
1336 // JVMTI has already reported the pending exception
1337 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1338 if (THREAD->is_Java_thread()) {
1339 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1340 }
1341 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1342 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1343 // Throw a java.security.PrivilegedActionException(Exception e) exception
1344 JavaCallArguments args(pending_exception);
1345 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1346 vmSymbols::exception_void_signature(),
1347 &args);
1348 }
1349 }
1350
1351 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1352 return JNIHandles::make_local(env, (oop) result.get_jobject());
1353 JVM_END
1354
1355
1356 // Returns the inherited_access_control_context field of the running thread.
1357 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1358 JVMWrapper("JVM_GetInheritedAccessControlContext");
1359 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1360 return JNIHandles::make_local(env, result);
1361 JVM_END
1362
1363 class RegisterArrayForGC {
1364 private:
1365 JavaThread *_thread;
1366 public:
1367 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1368 _thread = thread;
1369 _thread->register_array_for_gc(array);
1370 }
1371
1372 ~RegisterArrayForGC() {
1373 _thread->register_array_for_gc(NULL);
1374 }
1375 };
1376
1377
1378 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1379 JVMWrapper("JVM_GetStackAccessControlContext");
1380 if (!UsePrivilegedStack) return NULL;
1381
1382 ResourceMark rm(THREAD);
1383 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1384 JvmtiVMObjectAllocEventCollector oam;
1385
1386 // count the protection domains on the execution stack. We collapse
1387 // duplicate consecutive protection domains into a single one, as
1388 // well as stopping when we hit a privileged frame.
1389
1390 // Use vframeStream to iterate through Java frames
1391 vframeStream vfst(thread);
1392
1393 oop previous_protection_domain = NULL;
1394 Handle privileged_context(thread, NULL);
1395 bool is_privileged = false;
1396 oop protection_domain = NULL;
1397
1398 for(; !vfst.at_end(); vfst.next()) {
1399 // get method of frame
1400 Method* method = vfst.method();
1401 intptr_t* frame_id = vfst.frame_id();
1402
1403 // check the privileged frames to see if we have a match
1404 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1405 // this frame is privileged
1406 is_privileged = true;
1407 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1408 protection_domain = thread->privileged_stack_top()->protection_domain();
1409 } else {
1410 protection_domain = method->method_holder()->protection_domain();
1411 }
1412
1413 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1414 local_array->push(protection_domain);
1415 previous_protection_domain = protection_domain;
1416 }
1417
1418 if (is_privileged) break;
1419 }
1420
1421
1422 // either all the domains on the stack were system domains, or
1423 // we had a privileged system domain
1424 if (local_array->is_empty()) {
1425 if (is_privileged && privileged_context.is_null()) return NULL;
1426
1427 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1428 return JNIHandles::make_local(env, result);
1429 }
1430
1431 // the resource area must be registered in case of a gc
1432 RegisterArrayForGC ragc(thread, local_array);
1433 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1434 local_array->length(), CHECK_NULL);
1435 objArrayHandle h_context(thread, context);
1436 for (int index = 0; index < local_array->length(); index++) {
1437 h_context->obj_at_put(index, local_array->at(index));
1438 }
1439
1440 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1441
1442 return JNIHandles::make_local(env, result);
1443 JVM_END
1444
1445
1446 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1447 JVMWrapper("JVM_IsArrayClass");
1448 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1449 return (k != NULL) && k->is_array_klass() ? true : false;
1450 JVM_END
1451
1452
1453 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1454 JVMWrapper("JVM_IsPrimitiveClass");
1455 oop mirror = JNIHandles::resolve_non_null(cls);
1456 return (jboolean) java_lang_Class::is_primitive(mirror);
1457 JVM_END
1458
1459
1460 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1461 JVMWrapper("JVM_GetClassModifiers");
1462 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1463 // Primitive type
1464 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1465 }
1466
1467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1468 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1469 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1470 return k->modifier_flags();
1471 JVM_END
1472
1473
1474 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1475
1476 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1477 JvmtiVMObjectAllocEventCollector oam;
1478 // ofClass is a reference to a java_lang_Class object. The mirror object
1479 // of an InstanceKlass
1480
1481 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1482 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1483 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1484 return (jobjectArray)JNIHandles::make_local(env, result);
1485 }
1486
1487 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1488 InnerClassesIterator iter(k);
1489
1490 if (iter.length() == 0) {
1491 // Neither an inner nor outer class
1492 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1493 return (jobjectArray)JNIHandles::make_local(env, result);
1494 }
1495
1496 // find inner class info
1497 constantPoolHandle cp(thread, k->constants());
1498 int length = iter.length();
1499
1500 // Allocate temp. result array
1501 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1502 objArrayHandle result (THREAD, r);
1503 int members = 0;
1504
1505 for (; !iter.done(); iter.next()) {
1506 int ioff = iter.inner_class_info_index();
1507 int ooff = iter.outer_class_info_index();
1508
1509 if (ioff != 0 && ooff != 0) {
1510 // Check to see if the name matches the class we're looking for
1511 // before attempting to find the class.
1512 if (cp->klass_name_at_matches(k, ooff)) {
1513 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1514 if (outer_klass == k) {
1515 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1516 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1517
1518 // Throws an exception if outer klass has not declared k as
1519 // an inner klass
1520 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1521
1522 result->obj_at_put(members, inner_klass->java_mirror());
1523 members++;
1524 }
1525 }
1526 }
1527 }
1528
1529 if (members != length) {
1530 // Return array of right length
1531 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1532 for(int i = 0; i < members; i++) {
1533 res->obj_at_put(i, result->obj_at(i));
1534 }
1535 return (jobjectArray)JNIHandles::make_local(env, res);
1536 }
1537
1538 return (jobjectArray)JNIHandles::make_local(env, result());
1539 JVM_END
1540
1541
1542 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1543 {
1544 // ofClass is a reference to a java_lang_Class object.
1545 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1546 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1547 return NULL;
1548 }
1549
1550 bool inner_is_member = false;
1551 Klass* outer_klass
1552 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1553 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1554 if (outer_klass == NULL) return NULL; // already a top-level class
1555 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1556 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1557 }
1558 JVM_END
1559
1560 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1561 {
1562 oop mirror = JNIHandles::resolve_non_null(cls);
1563 if (java_lang_Class::is_primitive(mirror) ||
1564 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1565 return NULL;
1566 }
1567 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1568 int ooff = 0, noff = 0;
1569 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1570 if (noff != 0) {
1571 constantPoolHandle i_cp(thread, k->constants());
1572 Symbol* name = i_cp->symbol_at(noff);
1573 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1574 return (jstring) JNIHandles::make_local(env, str());
1575 }
1576 }
1577 return NULL;
1578 }
1579 JVM_END
1580
1581 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1582 assert (cls != NULL, "illegal class");
1583 JVMWrapper("JVM_GetClassSignature");
1584 JvmtiVMObjectAllocEventCollector oam;
1585 ResourceMark rm(THREAD);
1586 // Return null for arrays and primatives
1587 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1589 if (k->is_instance_klass()) {
1590 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1591 if (sym == NULL) return NULL;
1592 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1593 return (jstring) JNIHandles::make_local(env, str());
1594 }
1595 }
1596 return NULL;
1597 JVM_END
1598
1599
1600 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1601 assert (cls != NULL, "illegal class");
1602 JVMWrapper("JVM_GetClassAnnotations");
1603
1604 // Return null for arrays and primitives
1605 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1607 if (k->is_instance_klass()) {
1608 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1609 return (jbyteArray) JNIHandles::make_local(env, a);
1610 }
1611 }
1612 return NULL;
1613 JVM_END
1614
1615
1616 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1617 // some of this code was adapted from from jni_FromReflectedField
1618
1619 oop reflected = JNIHandles::resolve_non_null(field);
1620 oop mirror = java_lang_reflect_Field::clazz(reflected);
1621 Klass* k = java_lang_Class::as_Klass(mirror);
1622 int slot = java_lang_reflect_Field::slot(reflected);
1623 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1624
1625 InstanceKlass* ik = InstanceKlass::cast(k);
1626 intptr_t offset = ik->field_offset(slot);
1627
1628 if (modifiers & JVM_ACC_STATIC) {
1629 // for static fields we only look in the current class
1630 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1631 assert(false, "cannot find static field");
1632 return false;
1633 }
1634 } else {
1635 // for instance fields we start with the current class and work
1636 // our way up through the superclass chain
1637 if (!ik->find_field_from_offset(offset, false, &fd)) {
1638 assert(false, "cannot find instance field");
1639 return false;
1640 }
1641 }
1642 return true;
1643 }
1644
1645 static Method* jvm_get_method_common(jobject method) {
1646 // some of this code was adapted from from jni_FromReflectedMethod
1647
1648 oop reflected = JNIHandles::resolve_non_null(method);
1649 oop mirror = NULL;
1650 int slot = 0;
1651
1652 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1653 mirror = java_lang_reflect_Constructor::clazz(reflected);
1654 slot = java_lang_reflect_Constructor::slot(reflected);
1655 } else {
1656 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1657 "wrong type");
1658 mirror = java_lang_reflect_Method::clazz(reflected);
1659 slot = java_lang_reflect_Method::slot(reflected);
1660 }
1661 Klass* k = java_lang_Class::as_Klass(mirror);
1662
1663 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1664 assert(m != NULL, "cannot find method");
1665 return m; // caller has to deal with NULL in product mode
1666 }
1667
1668 /* Type use annotations support (JDK 1.8) */
1669
1670 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1671 assert (cls != NULL, "illegal class");
1672 JVMWrapper("JVM_GetClassTypeAnnotations");
1673 ResourceMark rm(THREAD);
1674 // Return null for arrays and primitives
1675 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1676 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1677 if (k->is_instance_klass()) {
1678 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1679 if (type_annotations != NULL) {
1680 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1681 return (jbyteArray) JNIHandles::make_local(env, a);
1682 }
1683 }
1684 }
1685 return NULL;
1686 JVM_END
1687
1688 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1689 assert (method != NULL, "illegal method");
1690 JVMWrapper("JVM_GetMethodTypeAnnotations");
1691
1692 // method is a handle to a java.lang.reflect.Method object
1693 Method* m = jvm_get_method_common(method);
1694 if (m == NULL) {
1695 return NULL;
1696 }
1697
1698 AnnotationArray* type_annotations = m->type_annotations();
1699 if (type_annotations != NULL) {
1700 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1701 return (jbyteArray) JNIHandles::make_local(env, a);
1702 }
1703
1704 return NULL;
1705 JVM_END
1706
1707 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1708 assert (field != NULL, "illegal field");
1709 JVMWrapper("JVM_GetFieldTypeAnnotations");
1710
1711 fieldDescriptor fd;
1712 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1713 if (!gotFd) {
1714 return NULL;
1715 }
1716
1717 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1718 JVM_END
1719
1720 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1721 if (!cp->is_within_bounds(index)) {
1722 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1723 }
1724 }
1725
1726 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1727 {
1728 JVMWrapper("JVM_GetMethodParameters");
1729 // method is a handle to a java.lang.reflect.Method object
1730 Method* method_ptr = jvm_get_method_common(method);
1731 methodHandle mh (THREAD, method_ptr);
1732 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1733 const int num_params = mh->method_parameters_length();
1734
1735 if (num_params < 0) {
1736 // A -1 return value from method_parameters_length means there is no
1737 // parameter data. Return null to indicate this to the reflection
1738 // API.
1739 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1740 return (jobjectArray)NULL;
1741 } else {
1742 // Otherwise, we return something up to reflection, even if it is
1743 // a zero-length array. Why? Because in some cases this can
1744 // trigger a MalformedParametersException.
1745
1746 // make sure all the symbols are properly formatted
1747 for (int i = 0; i < num_params; i++) {
1748 MethodParametersElement* params = mh->method_parameters_start();
1749 int index = params[i].name_cp_index;
1750 bounds_check(mh->constants(), index, CHECK_NULL);
1751
1752 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1753 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1754 "Wrong type at constant pool index");
1755 }
1756
1757 }
1758
1759 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1760 objArrayHandle result (THREAD, result_oop);
1761
1762 for (int i = 0; i < num_params; i++) {
1763 MethodParametersElement* params = mh->method_parameters_start();
1764 // For a 0 index, give a NULL symbol
1765 Symbol* sym = 0 != params[i].name_cp_index ?
1766 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1767 int flags = params[i].flags;
1768 oop param = Reflection::new_parameter(reflected_method, i, sym,
1769 flags, CHECK_NULL);
1770 result->obj_at_put(i, param);
1771 }
1772 return (jobjectArray)JNIHandles::make_local(env, result());
1773 }
1774 }
1775 JVM_END
1776
1777 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1778
1779 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1780 {
1781 JVMWrapper("JVM_GetClassDeclaredFields");
1782 JvmtiVMObjectAllocEventCollector oam;
1783
1784 // Exclude primitive types and array types
1785 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1786 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1787 // Return empty array
1788 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1789 return (jobjectArray) JNIHandles::make_local(env, res);
1790 }
1791
1792 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1793 constantPoolHandle cp(THREAD, k->constants());
1794
1795 // Ensure class is linked
1796 k->link_class(CHECK_NULL);
1797
1798 // Allocate result
1799 int num_fields;
1800
1801 if (publicOnly) {
1802 num_fields = 0;
1803 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1804 if (fs.access_flags().is_public()) ++num_fields;
1805 }
1806 } else {
1807 num_fields = k->java_fields_count();
1808 }
1809
1810 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1811 objArrayHandle result (THREAD, r);
1812
1813 int out_idx = 0;
1814 fieldDescriptor fd;
1815 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1816 if (!publicOnly || fs.access_flags().is_public()) {
1817 fd.reinitialize(k, fs.index());
1818 oop field = Reflection::new_field(&fd, CHECK_NULL);
1819 result->obj_at_put(out_idx, field);
1820 ++out_idx;
1821 }
1822 }
1823 assert(out_idx == num_fields, "just checking");
1824 return (jobjectArray) JNIHandles::make_local(env, result());
1825 }
1826 JVM_END
1827
1828 static bool select_method(const methodHandle& method, bool want_constructor) {
1829 if (want_constructor) {
1830 return (method->is_initializer() && !method->is_static());
1831 } else {
1832 return (!method->is_initializer() && !method->is_overpass());
1833 }
1834 }
1835
1836 static jobjectArray get_class_declared_methods_helper(
1837 JNIEnv *env,
1838 jclass ofClass, jboolean publicOnly,
1839 bool want_constructor,
1840 Klass* klass, TRAPS) {
1841
1842 JvmtiVMObjectAllocEventCollector oam;
1843
1844 // Exclude primitive types and array types
1845 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1846 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1847 // Return empty array
1848 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1849 return (jobjectArray) JNIHandles::make_local(env, res);
1850 }
1851
1852 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1853
1854 // Ensure class is linked
1855 k->link_class(CHECK_NULL);
1856
1857 Array<Method*>* methods = k->methods();
1858 int methods_length = methods->length();
1859
1860 // Save original method_idnum in case of redefinition, which can change
1861 // the idnum of obsolete methods. The new method will have the same idnum
1862 // but if we refresh the methods array, the counts will be wrong.
1863 ResourceMark rm(THREAD);
1864 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1865 int num_methods = 0;
1866
1867 for (int i = 0; i < methods_length; i++) {
1868 methodHandle method(THREAD, methods->at(i));
1869 if (select_method(method, want_constructor)) {
1870 if (!publicOnly || method->is_public()) {
1871 idnums->push(method->method_idnum());
1872 ++num_methods;
1873 }
1874 }
1875 }
1876
1877 // Allocate result
1878 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1879 objArrayHandle result (THREAD, r);
1880
1881 // Now just put the methods that we selected above, but go by their idnum
1882 // in case of redefinition. The methods can be redefined at any safepoint,
1883 // so above when allocating the oop array and below when creating reflect
1884 // objects.
1885 for (int i = 0; i < num_methods; i++) {
1886 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1887 if (method.is_null()) {
1888 // Method may have been deleted and seems this API can handle null
1889 // Otherwise should probably put a method that throws NSME
1890 result->obj_at_put(i, NULL);
1891 } else {
1892 oop m;
1893 if (want_constructor) {
1894 m = Reflection::new_constructor(method, CHECK_NULL);
1895 } else {
1896 m = Reflection::new_method(method, false, CHECK_NULL);
1897 }
1898 result->obj_at_put(i, m);
1899 }
1900 }
1901
1902 return (jobjectArray) JNIHandles::make_local(env, result());
1903 }
1904
1905 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1906 {
1907 JVMWrapper("JVM_GetClassDeclaredMethods");
1908 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1909 /*want_constructor*/ false,
1910 SystemDictionary::reflect_Method_klass(), THREAD);
1911 }
1912 JVM_END
1913
1914 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1915 {
1916 JVMWrapper("JVM_GetClassDeclaredConstructors");
1917 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1918 /*want_constructor*/ true,
1919 SystemDictionary::reflect_Constructor_klass(), THREAD);
1920 }
1921 JVM_END
1922
1923 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1924 {
1925 JVMWrapper("JVM_GetClassAccessFlags");
1926 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1927 // Primitive type
1928 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1929 }
1930
1931 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1932 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1933 }
1934 JVM_END
1935
1936
1937 // Constant pool access //////////////////////////////////////////////////////////
1938
1939 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1940 {
1941 JVMWrapper("JVM_GetClassConstantPool");
1942 JvmtiVMObjectAllocEventCollector oam;
1943
1944 // Return null for primitives and arrays
1945 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1946 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1947 if (k->is_instance_klass()) {
1948 InstanceKlass* k_h = InstanceKlass::cast(k);
1949 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1950 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1951 return JNIHandles::make_local(jcp());
1952 }
1953 }
1954 return NULL;
1955 }
1956 JVM_END
1957
1958
1959 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1960 {
1961 JVMWrapper("JVM_ConstantPoolGetSize");
1962 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1963 return cp->length();
1964 }
1965 JVM_END
1966
1967
1968 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1969 {
1970 JVMWrapper("JVM_ConstantPoolGetClassAt");
1971 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1972 bounds_check(cp, index, CHECK_NULL);
1973 constantTag tag = cp->tag_at(index);
1974 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1975 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1976 }
1977 Klass* k = cp->klass_at(index, CHECK_NULL);
1978 return (jclass) JNIHandles::make_local(k->java_mirror());
1979 }
1980 JVM_END
1981
1982 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1983 {
1984 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1985 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1986 bounds_check(cp, index, CHECK_NULL);
1987 constantTag tag = cp->tag_at(index);
1988 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1989 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1990 }
1991 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1992 if (k == NULL) return NULL;
1993 return (jclass) JNIHandles::make_local(k->java_mirror());
1994 }
1995 JVM_END
1996
1997 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1998 constantTag tag = cp->tag_at(index);
1999 if (!tag.is_method() && !tag.is_interface_method()) {
2000 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2001 }
2002 int klass_ref = cp->uncached_klass_ref_index_at(index);
2003 Klass* k_o;
2004 if (force_resolution) {
2005 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2006 } else {
2007 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2008 if (k_o == NULL) return NULL;
2009 }
2010 InstanceKlass* k = InstanceKlass::cast(k_o);
2011 Symbol* name = cp->uncached_name_ref_at(index);
2012 Symbol* sig = cp->uncached_signature_ref_at(index);
2013 methodHandle m (THREAD, k->find_method(name, sig));
2014 if (m.is_null()) {
2015 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2016 }
2017 oop method;
2018 if (!m->is_initializer() || m->is_static()) {
2019 method = Reflection::new_method(m, true, CHECK_NULL);
2020 } else {
2021 method = Reflection::new_constructor(m, CHECK_NULL);
2022 }
2023 return JNIHandles::make_local(method);
2024 }
2025
2026 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2027 {
2028 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2029 JvmtiVMObjectAllocEventCollector oam;
2030 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2031 bounds_check(cp, index, CHECK_NULL);
2032 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2033 return res;
2034 }
2035 JVM_END
2036
2037 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2038 {
2039 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2040 JvmtiVMObjectAllocEventCollector oam;
2041 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2042 bounds_check(cp, index, CHECK_NULL);
2043 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2044 return res;
2045 }
2046 JVM_END
2047
2048 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2049 constantTag tag = cp->tag_at(index);
2050 if (!tag.is_field()) {
2051 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2052 }
2053 int klass_ref = cp->uncached_klass_ref_index_at(index);
2054 Klass* k_o;
2055 if (force_resolution) {
2056 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2057 } else {
2058 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2059 if (k_o == NULL) return NULL;
2060 }
2061 InstanceKlass* k = InstanceKlass::cast(k_o);
2062 Symbol* name = cp->uncached_name_ref_at(index);
2063 Symbol* sig = cp->uncached_signature_ref_at(index);
2064 fieldDescriptor fd;
2065 Klass* target_klass = k->find_field(name, sig, &fd);
2066 if (target_klass == NULL) {
2067 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2068 }
2069 oop field = Reflection::new_field(&fd, CHECK_NULL);
2070 return JNIHandles::make_local(field);
2071 }
2072
2073 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2074 {
2075 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2076 JvmtiVMObjectAllocEventCollector oam;
2077 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2078 bounds_check(cp, index, CHECK_NULL);
2079 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2080 return res;
2081 }
2082 JVM_END
2083
2084 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2085 {
2086 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2087 JvmtiVMObjectAllocEventCollector oam;
2088 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2089 bounds_check(cp, index, CHECK_NULL);
2090 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2091 return res;
2092 }
2093 JVM_END
2094
2095 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2096 {
2097 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2098 JvmtiVMObjectAllocEventCollector oam;
2099 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2100 bounds_check(cp, index, CHECK_NULL);
2101 constantTag tag = cp->tag_at(index);
2102 if (!tag.is_field_or_method()) {
2103 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2104 }
2105 int klass_ref = cp->uncached_klass_ref_index_at(index);
2106 Symbol* klass_name = cp->klass_name_at(klass_ref);
2107 Symbol* member_name = cp->uncached_name_ref_at(index);
2108 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2109 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2110 objArrayHandle dest(THREAD, dest_o);
2111 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2112 dest->obj_at_put(0, str());
2113 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2114 dest->obj_at_put(1, str());
2115 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2116 dest->obj_at_put(2, str());
2117 return (jobjectArray) JNIHandles::make_local(dest());
2118 }
2119 JVM_END
2120
2121 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2122 {
2123 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2124 JvmtiVMObjectAllocEventCollector oam;
2125 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2126 bounds_check(cp, index, CHECK_0);
2127 constantTag tag = cp->tag_at(index);
2128 if (!tag.is_field_or_method()) {
2129 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2130 }
2131 return (jint) cp->uncached_klass_ref_index_at(index);
2132 }
2133 JVM_END
2134
2135 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2136 {
2137 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2138 JvmtiVMObjectAllocEventCollector oam;
2139 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2140 bounds_check(cp, index, CHECK_0);
2141 constantTag tag = cp->tag_at(index);
2142 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2144 }
2145 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2152 JvmtiVMObjectAllocEventCollector oam;
2153 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_NULL);
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_name_and_type()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2160 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2161 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2162 objArrayHandle dest(THREAD, dest_o);
2163 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2164 dest->obj_at_put(0, str());
2165 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2166 dest->obj_at_put(1, str());
2167 return (jobjectArray) JNIHandles::make_local(dest());
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2172 {
2173 JVMWrapper("JVM_ConstantPoolGetIntAt");
2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175 bounds_check(cp, index, CHECK_0);
2176 constantTag tag = cp->tag_at(index);
2177 if (!tag.is_int()) {
2178 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2179 }
2180 return cp->int_at(index);
2181 }
2182 JVM_END
2183
2184 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2185 {
2186 JVMWrapper("JVM_ConstantPoolGetLongAt");
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 bounds_check(cp, index, CHECK_(0L));
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_long()) {
2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 return cp->long_at(index);
2194 }
2195 JVM_END
2196
2197 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2198 {
2199 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_(0.0f));
2202 constantTag tag = cp->tag_at(index);
2203 if (!tag.is_float()) {
2204 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2205 }
2206 return cp->float_at(index);
2207 }
2208 JVM_END
2209
2210 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2211 {
2212 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2213 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2214 bounds_check(cp, index, CHECK_(0.0));
2215 constantTag tag = cp->tag_at(index);
2216 if (!tag.is_double()) {
2217 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2218 }
2219 return cp->double_at(index);
2220 }
2221 JVM_END
2222
2223 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2224 {
2225 JVMWrapper("JVM_ConstantPoolGetStringAt");
2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2227 bounds_check(cp, index, CHECK_NULL);
2228 constantTag tag = cp->tag_at(index);
2229 if (!tag.is_string()) {
2230 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2231 }
2232 oop str = cp->string_at(index, CHECK_NULL);
2233 return (jstring) JNIHandles::make_local(str);
2234 }
2235 JVM_END
2236
2237 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2238 {
2239 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2240 JvmtiVMObjectAllocEventCollector oam;
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_NULL);
2243 constantTag tag = cp->tag_at(index);
2244 if (!tag.is_symbol()) {
2245 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2246 }
2247 Symbol* sym = cp->symbol_at(index);
2248 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2249 return (jstring) JNIHandles::make_local(str());
2250 }
2251 JVM_END
2252
2253 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2254 {
2255 JVMWrapper("JVM_ConstantPoolGetTagAt");
2256 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2257 bounds_check(cp, index, CHECK_0);
2258 constantTag tag = cp->tag_at(index);
2259 jbyte result = tag.value();
2260 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2261 // they are changed to the corresponding tags from the JVM spec, so that java code in
2262 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2263 if (tag.is_klass_or_reference()) {
2264 result = JVM_CONSTANT_Class;
2265 } else if (tag.is_string_index()) {
2266 result = JVM_CONSTANT_String;
2267 } else if (tag.is_method_type_in_error()) {
2268 result = JVM_CONSTANT_MethodType;
2269 } else if (tag.is_method_handle_in_error()) {
2270 result = JVM_CONSTANT_MethodHandle;
2271 } else if (tag.is_dynamic_constant_in_error()) {
2272 result = JVM_CONSTANT_Dynamic;
2273 }
2274 return result;
2275 }
2276 JVM_END
2277
2278 // Assertion support. //////////////////////////////////////////////////////////
2279
2280 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2281 JVMWrapper("JVM_DesiredAssertionStatus");
2282 assert(cls != NULL, "bad class");
2283
2284 oop r = JNIHandles::resolve(cls);
2285 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2286 if (java_lang_Class::is_primitive(r)) return false;
2287
2288 Klass* k = java_lang_Class::as_Klass(r);
2289 assert(k->is_instance_klass(), "must be an instance klass");
2290 if (!k->is_instance_klass()) return false;
2291
2292 ResourceMark rm(THREAD);
2293 const char* name = k->name()->as_C_string();
2294 bool system_class = k->class_loader() == NULL;
2295 return JavaAssertions::enabled(name, system_class);
2296
2297 JVM_END
2298
2299
2300 // Return a new AssertionStatusDirectives object with the fields filled in with
2301 // command-line assertion arguments (i.e., -ea, -da).
2302 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2303 JVMWrapper("JVM_AssertionStatusDirectives");
2304 JvmtiVMObjectAllocEventCollector oam;
2305 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2306 return JNIHandles::make_local(env, asd);
2307 JVM_END
2308
2309 // Verification ////////////////////////////////////////////////////////////////////////////////
2310
2311 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2312
2313 // RedefineClasses support: bug 6214132 caused verification to fail.
2314 // All functions from this section should call the jvmtiThreadSate function:
2315 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2316 // The function returns a Klass* of the _scratch_class if the verifier
2317 // was invoked in the middle of the class redefinition.
2318 // Otherwise it returns its argument value which is the _the_class Klass*.
2319 // Please, refer to the description in the jvmtiThreadSate.hpp.
2320
2321 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2322 JVMWrapper("JVM_GetClassNameUTF");
2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325 return k->name()->as_utf8();
2326 JVM_END
2327
2328
2329 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2330 JVMWrapper("JVM_GetClassCPTypes");
2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2333 // types will have length zero if this is not an InstanceKlass
2334 // (length is determined by call to JVM_GetClassCPEntriesCount)
2335 if (k->is_instance_klass()) {
2336 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2337 for (int index = cp->length() - 1; index >= 0; index--) {
2338 constantTag tag = cp->tag_at(index);
2339 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2340 }
2341 }
2342 JVM_END
2343
2344
2345 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2346 JVMWrapper("JVM_GetClassCPEntriesCount");
2347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2348 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2349 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2350 JVM_END
2351
2352
2353 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2354 JVMWrapper("JVM_GetClassFieldsCount");
2355 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2356 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2357 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2358 JVM_END
2359
2360
2361 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2362 JVMWrapper("JVM_GetClassMethodsCount");
2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2365 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2366 JVM_END
2367
2368
2369 // The following methods, used for the verifier, are never called with
2370 // array klasses, so a direct cast to InstanceKlass is safe.
2371 // Typically, these methods are called in a loop with bounds determined
2372 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2373 // zero for arrays.
2374 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2375 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2378 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2379 int length = method->checked_exceptions_length();
2380 if (length > 0) {
2381 CheckedExceptionElement* table= method->checked_exceptions_start();
2382 for (int i = 0; i < length; i++) {
2383 exceptions[i] = table[i].class_cp_index;
2384 }
2385 }
2386 JVM_END
2387
2388
2389 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2390 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2393 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2394 return method->checked_exceptions_length();
2395 JVM_END
2396
2397
2398 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2399 JVMWrapper("JVM_GetMethodIxByteCode");
2400 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2401 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2402 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2403 memcpy(code, method->code_base(), method->code_size());
2404 JVM_END
2405
2406
2407 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2408 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2412 return method->code_size();
2413 JVM_END
2414
2415
2416 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2417 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2421 ExceptionTable extable(method);
2422 entry->start_pc = extable.start_pc(entry_index);
2423 entry->end_pc = extable.end_pc(entry_index);
2424 entry->handler_pc = extable.handler_pc(entry_index);
2425 entry->catchType = extable.catch_type_index(entry_index);
2426 JVM_END
2427
2428
2429 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2430 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2434 return method->exception_table_length();
2435 JVM_END
2436
2437
2438 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2439 JVMWrapper("JVM_GetMethodIxModifiers");
2440 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2441 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2442 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2443 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2444 JVM_END
2445
2446
2447 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2448 JVMWrapper("JVM_GetFieldIxModifiers");
2449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2450 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2451 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2452 JVM_END
2453
2454
2455 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2456 JVMWrapper("JVM_GetMethodIxLocalsCount");
2457 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2458 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2459 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2460 return method->max_locals();
2461 JVM_END
2462
2463
2464 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2465 JVMWrapper("JVM_GetMethodIxArgsSize");
2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2468 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2469 return method->size_of_parameters();
2470 JVM_END
2471
2472
2473 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2474 JVMWrapper("JVM_GetMethodIxMaxStack");
2475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2476 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2477 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2478 return method->verifier_max_stack();
2479 JVM_END
2480
2481
2482 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2483 JVMWrapper("JVM_IsConstructorIx");
2484 ResourceMark rm(THREAD);
2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2488 return method->name() == vmSymbols::object_initializer_name();
2489 JVM_END
2490
2491
2492 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2493 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2494 ResourceMark rm(THREAD);
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2498 return method->is_overpass();
2499 JVM_END
2500
2501 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2502 JVMWrapper("JVM_GetMethodIxIxUTF");
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2506 return method->name()->as_utf8();
2507 JVM_END
2508
2509
2510 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2511 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2514 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2515 return method->signature()->as_utf8();
2516 JVM_END
2517
2518 /**
2519 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2520 * read entries in the constant pool. Since the old verifier always
2521 * works on a copy of the code, it will not see any rewriting that
2522 * may possibly occur in the middle of verification. So it is important
2523 * that nothing it calls tries to use the cpCache instead of the raw
2524 * constant pool, so we must use cp->uncached_x methods when appropriate.
2525 */
2526 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2527 JVMWrapper("JVM_GetCPFieldNameUTF");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2531 switch (cp->tag_at(cp_index).value()) {
2532 case JVM_CONSTANT_Fieldref:
2533 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2534 default:
2535 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return NULL;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 JVMWrapper("JVM_GetCPMethodNameUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2547 switch (cp->tag_at(cp_index).value()) {
2548 case JVM_CONSTANT_InterfaceMethodref:
2549 case JVM_CONSTANT_Methodref:
2550 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2551 default:
2552 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2553 }
2554 ShouldNotReachHere();
2555 return NULL;
2556 JVM_END
2557
2558
2559 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2560 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2562 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2563 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2564 switch (cp->tag_at(cp_index).value()) {
2565 case JVM_CONSTANT_InterfaceMethodref:
2566 case JVM_CONSTANT_Methodref:
2567 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2568 default:
2569 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2570 }
2571 ShouldNotReachHere();
2572 return NULL;
2573 JVM_END
2574
2575
2576 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2577 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2581 switch (cp->tag_at(cp_index).value()) {
2582 case JVM_CONSTANT_Fieldref:
2583 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2584 default:
2585 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2586 }
2587 ShouldNotReachHere();
2588 return NULL;
2589 JVM_END
2590
2591
2592 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2593 JVMWrapper("JVM_GetCPClassNameUTF");
2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2597 Symbol* classname = cp->klass_name_at(cp_index);
2598 return classname->as_utf8();
2599 JVM_END
2600
2601
2602 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2603 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2606 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2607 switch (cp->tag_at(cp_index).value()) {
2608 case JVM_CONSTANT_Fieldref: {
2609 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2610 Symbol* classname = cp->klass_name_at(class_index);
2611 return classname->as_utf8();
2612 }
2613 default:
2614 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2615 }
2616 ShouldNotReachHere();
2617 return NULL;
2618 JVM_END
2619
2620
2621 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2622 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2623 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2624 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2625 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2626 switch (cp->tag_at(cp_index).value()) {
2627 case JVM_CONSTANT_Methodref:
2628 case JVM_CONSTANT_InterfaceMethodref: {
2629 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2630 Symbol* classname = cp->klass_name_at(class_index);
2631 return classname->as_utf8();
2632 }
2633 default:
2634 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2635 }
2636 ShouldNotReachHere();
2637 return NULL;
2638 JVM_END
2639
2640
2641 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2642 JVMWrapper("JVM_GetCPFieldModifiers");
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2645 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2646 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2647 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2648 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2649 switch (cp->tag_at(cp_index).value()) {
2650 case JVM_CONSTANT_Fieldref: {
2651 Symbol* name = cp->uncached_name_ref_at(cp_index);
2652 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2653 InstanceKlass* ik = InstanceKlass::cast(k_called);
2654 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2655 if (fs.name() == name && fs.signature() == signature) {
2656 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2657 }
2658 }
2659 return -1;
2660 }
2661 default:
2662 fatal("JVM_GetCPFieldModifiers: illegal constant");
2663 }
2664 ShouldNotReachHere();
2665 return 0;
2666 JVM_END
2667
2668
2669 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2670 JVMWrapper("JVM_GetCPMethodModifiers");
2671 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2672 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2675 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2676 switch (cp->tag_at(cp_index).value()) {
2677 case JVM_CONSTANT_Methodref:
2678 case JVM_CONSTANT_InterfaceMethodref: {
2679 Symbol* name = cp->uncached_name_ref_at(cp_index);
2680 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2681 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2682 int methods_count = methods->length();
2683 for (int i = 0; i < methods_count; i++) {
2684 Method* method = methods->at(i);
2685 if (method->name() == name && method->signature() == signature) {
2686 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2687 }
2688 }
2689 return -1;
2690 }
2691 default:
2692 fatal("JVM_GetCPMethodModifiers: illegal constant");
2693 }
2694 ShouldNotReachHere();
2695 return 0;
2696 JVM_END
2697
2698
2699 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2700
2701 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2702 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2703 JVM_END
2704
2705
2706 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2707 JVMWrapper("JVM_IsSameClassPackage");
2708 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2709 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2710 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2711 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2712 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2713 JVM_END
2714
2715 // Printing support //////////////////////////////////////////////////
2716 extern "C" {
2717
2718 ATTRIBUTE_PRINTF(3, 0)
2719 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2720 // Reject count values that are negative signed values converted to
2721 // unsigned; see bug 4399518, 4417214
2722 if ((intptr_t)count < 0) return -1;
2723
2724 int result = os::vsnprintf(str, count, fmt, args);
2725 if (count > 0 && result > 0 && (size_t)result >= count) {
2726 result = -1;
2727 }
2728
2729 return result;
2730 }
2731
2732 ATTRIBUTE_PRINTF(3, 4)
2733 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2734 va_list args;
2735 int len;
2736 va_start(args, fmt);
2737 len = jio_vsnprintf(str, count, fmt, args);
2738 va_end(args);
2739 return len;
2740 }
2741
2742 ATTRIBUTE_PRINTF(2, 3)
2743 int jio_fprintf(FILE* f, const char *fmt, ...) {
2744 int len;
2745 va_list args;
2746 va_start(args, fmt);
2747 len = jio_vfprintf(f, fmt, args);
2748 va_end(args);
2749 return len;
2750 }
2751
2752 ATTRIBUTE_PRINTF(2, 0)
2753 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2754 if (Arguments::vfprintf_hook() != NULL) {
2755 return Arguments::vfprintf_hook()(f, fmt, args);
2756 } else {
2757 return vfprintf(f, fmt, args);
2758 }
2759 }
2760
2761 ATTRIBUTE_PRINTF(1, 2)
2762 JNIEXPORT int jio_printf(const char *fmt, ...) {
2763 int len;
2764 va_list args;
2765 va_start(args, fmt);
2766 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2767 va_end(args);
2768 return len;
2769 }
2770
2771 // HotSpot specific jio method
2772 void jio_print(const char* s, size_t len) {
2773 // Try to make this function as atomic as possible.
2774 if (Arguments::vfprintf_hook() != NULL) {
2775 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2776 } else {
2777 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2778 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2779 }
2780 }
2781
2782 } // Extern C
2783
2784 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2785
2786 // In most of the JVM thread support functions we need to access the
2787 // thread through a ThreadsListHandle to prevent it from exiting and
2788 // being reclaimed while we try to operate on it. The exceptions to this
2789 // rule are when operating on the current thread, or if the monitor of
2790 // the target java.lang.Thread is locked at the Java level - in both
2791 // cases the target cannot exit.
2792
2793 static void thread_entry(JavaThread* thread, TRAPS) {
2794 HandleMark hm(THREAD);
2795 Handle obj(THREAD, thread->threadObj());
2796 JavaValue result(T_VOID);
2797 JavaCalls::call_virtual(&result,
2798 obj,
2799 SystemDictionary::Thread_klass(),
2800 vmSymbols::run_method_name(),
2801 vmSymbols::void_method_signature(),
2802 THREAD);
2803 }
2804
2805
2806 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2807 JVMWrapper("JVM_StartThread");
2808 JavaThread *native_thread = NULL;
2809
2810 // We cannot hold the Threads_lock when we throw an exception,
2811 // due to rank ordering issues. Example: we might need to grab the
2812 // Heap_lock while we construct the exception.
2813 bool throw_illegal_thread_state = false;
2814
2815 // We must release the Threads_lock before we can post a jvmti event
2816 // in Thread::start.
2817 {
2818 // Ensure that the C++ Thread and OSThread structures aren't freed before
2819 // we operate.
2820 MutexLocker mu(Threads_lock);
2821
2822 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2823 // re-starting an already started thread, so we should usually find
2824 // that the JavaThread is null. However for a JNI attached thread
2825 // there is a small window between the Thread object being created
2826 // (with its JavaThread set) and the update to its threadStatus, so we
2827 // have to check for this
2828 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2829 throw_illegal_thread_state = true;
2830 } else {
2831 // We could also check the stillborn flag to see if this thread was already stopped, but
2832 // for historical reasons we let the thread detect that itself when it starts running
2833
2834 jlong size =
2835 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2836 // Allocate the C++ Thread structure and create the native thread. The
2837 // stack size retrieved from java is 64-bit signed, but the constructor takes
2838 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2839 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2840 // - Avoid passing negative values which would result in really large stacks.
2841 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2842 size_t sz = size > 0 ? (size_t) size : 0;
2843 native_thread = new JavaThread(&thread_entry, sz);
2844
2845 // At this point it may be possible that no osthread was created for the
2846 // JavaThread due to lack of memory. Check for this situation and throw
2847 // an exception if necessary. Eventually we may want to change this so
2848 // that we only grab the lock if the thread was created successfully -
2849 // then we can also do this check and throw the exception in the
2850 // JavaThread constructor.
2851 if (native_thread->osthread() != NULL) {
2852 // Note: the current thread is not being used within "prepare".
2853 native_thread->prepare(jthread);
2854 }
2855 }
2856 }
2857
2858 if (throw_illegal_thread_state) {
2859 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2860 }
2861
2862 assert(native_thread != NULL, "Starting null thread?");
2863
2864 if (native_thread->osthread() == NULL) {
2865 // No one should hold a reference to the 'native_thread'.
2866 native_thread->smr_delete();
2867 if (JvmtiExport::should_post_resource_exhausted()) {
2868 JvmtiExport::post_resource_exhausted(
2869 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2870 os::native_thread_creation_failed_msg());
2871 }
2872 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2873 os::native_thread_creation_failed_msg());
2874 }
2875
2876 Thread::start(native_thread);
2877
2878 JVM_END
2879
2880
2881 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2882 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2883 // but is thought to be reliable and simple. In the case, where the receiver is the
2884 // same thread as the sender, no VM_Operation is needed.
2885 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2886 JVMWrapper("JVM_StopThread");
2887
2888 // A nested ThreadsListHandle will grab the Threads_lock so create
2889 // tlh before we resolve throwable.
2890 ThreadsListHandle tlh(thread);
2891 oop java_throwable = JNIHandles::resolve(throwable);
2892 if (java_throwable == NULL) {
2893 THROW(vmSymbols::java_lang_NullPointerException());
2894 }
2895 oop java_thread = NULL;
2896 JavaThread* receiver = NULL;
2897 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2898 Events::log_exception(thread,
2899 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2900 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2901
2902 if (is_alive) {
2903 // jthread refers to a live JavaThread.
2904 if (thread == receiver) {
2905 // Exception is getting thrown at self so no VM_Operation needed.
2906 THROW_OOP(java_throwable);
2907 } else {
2908 // Use a VM_Operation to throw the exception.
2909 Thread::send_async_exception(java_thread, java_throwable);
2910 }
2911 } else {
2912 // Either:
2913 // - target thread has not been started before being stopped, or
2914 // - target thread already terminated
2915 // We could read the threadStatus to determine which case it is
2916 // but that is overkill as it doesn't matter. We must set the
2917 // stillborn flag for the first case, and if the thread has already
2918 // exited setting this flag has no effect.
2919 java_lang_Thread::set_stillborn(java_thread);
2920 }
2921 JVM_END
2922
2923
2924 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2925 JVMWrapper("JVM_IsThreadAlive");
2926
2927 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2928 return java_lang_Thread::is_alive(thread_oop);
2929 JVM_END
2930
2931
2932 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2933 JVMWrapper("JVM_SuspendThread");
2934
2935 ThreadsListHandle tlh(thread);
2936 JavaThread* receiver = NULL;
2937 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2938 if (is_alive) {
2939 // jthread refers to a live JavaThread.
2940 {
2941 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2942 if (receiver->is_external_suspend()) {
2943 // Don't allow nested external suspend requests. We can't return
2944 // an error from this interface so just ignore the problem.
2945 return;
2946 }
2947 if (receiver->is_exiting()) { // thread is in the process of exiting
2948 return;
2949 }
2950 receiver->set_external_suspend();
2951 }
2952
2953 // java_suspend() will catch threads in the process of exiting
2954 // and will ignore them.
2955 receiver->java_suspend();
2956
2957 // It would be nice to have the following assertion in all the
2958 // time, but it is possible for a racing resume request to have
2959 // resumed this thread right after we suspended it. Temporarily
2960 // enable this assertion if you are chasing a different kind of
2961 // bug.
2962 //
2963 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2964 // receiver->is_being_ext_suspended(), "thread is not suspended");
2965 }
2966 JVM_END
2967
2968
2969 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2970 JVMWrapper("JVM_ResumeThread");
2971
2972 ThreadsListHandle tlh(thread);
2973 JavaThread* receiver = NULL;
2974 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2975 if (is_alive) {
2976 // jthread refers to a live JavaThread.
2977
2978 // This is the original comment for this Threads_lock grab:
2979 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2980 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2981 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2982 // looks at it.
2983 //
2984 // The above comment dates back to when we had both internal and
2985 // external suspend APIs that shared a common underlying mechanism.
2986 // External suspend is now entirely cooperative and doesn't share
2987 // anything with internal suspend. That said, there are some
2988 // assumptions in the VM that an external resume grabs the
2989 // Threads_lock. We can't drop the Threads_lock grab here until we
2990 // resolve the assumptions that exist elsewhere.
2991 //
2992 MutexLocker ml(Threads_lock);
2993 receiver->java_resume();
2994 }
2995 JVM_END
2996
2997
2998 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2999 JVMWrapper("JVM_SetThreadPriority");
3000
3001 ThreadsListHandle tlh(thread);
3002 oop java_thread = NULL;
3003 JavaThread* receiver = NULL;
3004 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3005 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3006
3007 if (is_alive) {
3008 // jthread refers to a live JavaThread.
3009 Thread::set_priority(receiver, (ThreadPriority)prio);
3010 }
3011 // Implied else: If the JavaThread hasn't started yet, then the
3012 // priority set in the java.lang.Thread object above will be pushed
3013 // down when it does start.
3014 JVM_END
3015
3016
3017 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3018 JVMWrapper("JVM_Yield");
3019 if (os::dont_yield()) return;
3020 HOTSPOT_THREAD_YIELD();
3021 os::naked_yield();
3022 JVM_END
3023
3024
3025 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3026 JVMWrapper("JVM_Sleep");
3027
3028 if (millis < 0) {
3029 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3030 }
3031
3032 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3033 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3034 }
3035
3036 // Save current thread state and restore it at the end of this block.
3037 // And set new thread state to SLEEPING.
3038 JavaThreadSleepState jtss(thread);
3039
3040 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3041
3042 EventThreadSleep event;
3043
3044 if (millis == 0) {
3045 os::naked_yield();
3046 } else {
3047 ThreadState old_state = thread->osthread()->get_state();
3048 thread->osthread()->set_state(SLEEPING);
3049 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3050 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3051 // us while we were sleeping. We do not overwrite those.
3052 if (!HAS_PENDING_EXCEPTION) {
3053 if (event.should_commit()) {
3054 event.set_time(millis);
3055 event.commit();
3056 }
3057 HOTSPOT_THREAD_SLEEP_END(1);
3058
3059 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3060 // to properly restore the thread state. That's likely wrong.
3061 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3062 }
3063 }
3064 thread->osthread()->set_state(old_state);
3065 }
3066 if (event.should_commit()) {
3067 event.set_time(millis);
3068 event.commit();
3069 }
3070 HOTSPOT_THREAD_SLEEP_END(0);
3071 JVM_END
3072
3073 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3074 JVMWrapper("JVM_CurrentThread");
3075 oop jthread = thread->threadObj();
3076 assert (thread != NULL, "no current thread!");
3077 return JNIHandles::make_local(env, jthread);
3078 JVM_END
3079
3080
3081 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3082 JVMWrapper("JVM_CountStackFrames");
3083
3084 uint32_t debug_bits = 0;
3085 ThreadsListHandle tlh(thread);
3086 JavaThread* receiver = NULL;
3087 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3088 int count = 0;
3089 if (is_alive) {
3090 // jthread refers to a live JavaThread.
3091 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3092 // Count all java activation, i.e., number of vframes.
3093 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3094 // Native frames are not counted.
3095 if (!vfst.method()->is_native()) count++;
3096 }
3097 } else {
3098 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3099 "this thread is not suspended");
3100 }
3101 }
3102 // Implied else: if JavaThread is not alive simply return a count of 0.
3103
3104 return count;
3105 JVM_END
3106
3107
3108 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3109 JVMWrapper("JVM_Interrupt");
3110
3111 ThreadsListHandle tlh(thread);
3112 JavaThread* receiver = NULL;
3113 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3114 if (is_alive) {
3115 // jthread refers to a live JavaThread.
3116 Thread::interrupt(receiver);
3117 }
3118 JVM_END
3119
3120
3121 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3122 JVMWrapper("JVM_IsInterrupted");
3123
3124 ThreadsListHandle tlh(thread);
3125 JavaThread* receiver = NULL;
3126 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3127 if (is_alive) {
3128 // jthread refers to a live JavaThread.
3129 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3130 } else {
3131 return JNI_FALSE;
3132 }
3133 JVM_END
3134
3135
3136 // Return true iff the current thread has locked the object passed in
3137
3138 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3139 JVMWrapper("JVM_HoldsLock");
3140 assert(THREAD->is_Java_thread(), "sanity check");
3141 if (obj == NULL) {
3142 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3143 }
3144 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3145 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3146 JVM_END
3147
3148
3149 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3150 JVMWrapper("JVM_DumpAllStacks");
3151 VM_PrintThreads op;
3152 VMThread::execute(&op);
3153 if (JvmtiExport::should_post_data_dump()) {
3154 JvmtiExport::post_data_dump();
3155 }
3156 JVM_END
3157
3158 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3159 JVMWrapper("JVM_SetNativeThreadName");
3160
3161 // We don't use a ThreadsListHandle here because the current thread
3162 // must be alive.
3163 oop java_thread = JNIHandles::resolve_non_null(jthread);
3164 JavaThread* thr = java_lang_Thread::thread(java_thread);
3165 if (thread == thr && !thr->has_attached_via_jni()) {
3166 // Thread naming is only supported for the current thread and
3167 // we don't set the name of an attached thread to avoid stepping
3168 // on other programs.
3169 ResourceMark rm(thread);
3170 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3171 os::set_native_thread_name(thread_name);
3172 }
3173 JVM_END
3174
3175 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3176
3177 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3178 JVMWrapper("JVM_GetClassContext");
3179 ResourceMark rm(THREAD);
3180 JvmtiVMObjectAllocEventCollector oam;
3181 vframeStream vfst(thread);
3182
3183 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3184 // This must only be called from SecurityManager.getClassContext
3185 Method* m = vfst.method();
3186 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3187 m->name() == vmSymbols::getClassContext_name() &&
3188 m->signature() == vmSymbols::void_class_array_signature())) {
3189 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3190 }
3191 }
3192
3193 // Collect method holders
3194 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3195 for (; !vfst.at_end(); vfst.security_next()) {
3196 Method* m = vfst.method();
3197 // Native frames are not returned
3198 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3199 Klass* holder = m->method_holder();
3200 assert(holder->is_klass(), "just checking");
3201 klass_array->append(holder);
3202 }
3203 }
3204
3205 // Create result array of type [Ljava/lang/Class;
3206 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3207 // Fill in mirrors corresponding to method holders
3208 for (int i = 0; i < klass_array->length(); i++) {
3209 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3210 }
3211
3212 return (jobjectArray) JNIHandles::make_local(env, result);
3213 JVM_END
3214
3215
3216 // java.lang.Package ////////////////////////////////////////////////////////////////
3217
3218
3219 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3220 JVMWrapper("JVM_GetSystemPackage");
3221 ResourceMark rm(THREAD);
3222 JvmtiVMObjectAllocEventCollector oam;
3223 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3224 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3225 return (jstring) JNIHandles::make_local(result);
3226 JVM_END
3227
3228
3229 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3230 JVMWrapper("JVM_GetSystemPackages");
3231 JvmtiVMObjectAllocEventCollector oam;
3232 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3233 return (jobjectArray) JNIHandles::make_local(result);
3234 JVM_END
3235
3236
3237 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3238
3239
3240 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3241 JVMWrapper("JVM_GetAndClearReferencePendingList");
3242
3243 MonitorLockerEx ml(Heap_lock);
3244 oop ref = Universe::reference_pending_list();
3245 if (ref != NULL) {
3246 Universe::set_reference_pending_list(NULL);
3247 }
3248 return JNIHandles::make_local(env, ref);
3249 JVM_END
3250
3251 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3252 JVMWrapper("JVM_HasReferencePendingList");
3253 MonitorLockerEx ml(Heap_lock);
3254 return Universe::has_reference_pending_list();
3255 JVM_END
3256
3257 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3258 JVMWrapper("JVM_WaitForReferencePendingList");
3259 MonitorLockerEx ml(Heap_lock);
3260 while (!Universe::has_reference_pending_list()) {
3261 ml.wait();
3262 }
3263 JVM_END
3264
3265
3266 // ObjectInputStream ///////////////////////////////////////////////////////////////
3267
3268 // Return the first user-defined class loader up the execution stack, or null
3269 // if only code from the bootstrap or platform class loader is on the stack.
3270
3271 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3272 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3273 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3274 oop loader = vfst.method()->method_holder()->class_loader();
3275 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3276 return JNIHandles::make_local(env, loader);
3277 }
3278 }
3279 return NULL;
3280 JVM_END
3281
3282
3283 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3284
3285
3286 // resolve array handle and check arguments
3287 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3288 if (arr == NULL) {
3289 THROW_0(vmSymbols::java_lang_NullPointerException());
3290 }
3291 oop a = JNIHandles::resolve_non_null(arr);
3292 if (!a->is_array()) {
3293 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3294 } else if (type_array_only && !a->is_typeArray()) {
3295 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3296 }
3297 return arrayOop(a);
3298 }
3299
3300
3301 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3302 JVMWrapper("JVM_GetArrayLength");
3303 arrayOop a = check_array(env, arr, false, CHECK_0);
3304 return a->length();
3305 JVM_END
3306
3307
3308 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3309 JVMWrapper("JVM_Array_Get");
3310 JvmtiVMObjectAllocEventCollector oam;
3311 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3312 jvalue value;
3313 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3314 oop box = Reflection::box(&value, type, CHECK_NULL);
3315 return JNIHandles::make_local(env, box);
3316 JVM_END
3317
3318
3319 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3320 JVMWrapper("JVM_GetPrimitiveArrayElement");
3321 jvalue value;
3322 value.i = 0; // to initialize value before getting used in CHECK
3323 arrayOop a = check_array(env, arr, true, CHECK_(value));
3324 assert(a->is_typeArray(), "just checking");
3325 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3326 BasicType wide_type = (BasicType) wCode;
3327 if (type != wide_type) {
3328 Reflection::widen(&value, type, wide_type, CHECK_(value));
3329 }
3330 return value;
3331 JVM_END
3332
3333
3334 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3335 JVMWrapper("JVM_SetArrayElement");
3336 arrayOop a = check_array(env, arr, false, CHECK);
3337 oop box = JNIHandles::resolve(val);
3338 jvalue value;
3339 value.i = 0; // to initialize value before getting used in CHECK
3340 BasicType value_type;
3341 if (a->is_objArray()) {
3342 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3343 value_type = Reflection::unbox_for_regular_object(box, &value);
3344 } else {
3345 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3346 }
3347 Reflection::array_set(&value, a, index, value_type, CHECK);
3348 JVM_END
3349
3350
3351 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3352 JVMWrapper("JVM_SetPrimitiveArrayElement");
3353 arrayOop a = check_array(env, arr, true, CHECK);
3354 assert(a->is_typeArray(), "just checking");
3355 BasicType value_type = (BasicType) vCode;
3356 Reflection::array_set(&v, a, index, value_type, CHECK);
3357 JVM_END
3358
3359
3360 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3361 JVMWrapper("JVM_NewArray");
3362 JvmtiVMObjectAllocEventCollector oam;
3363 oop element_mirror = JNIHandles::resolve(eltClass);
3364 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3365 return JNIHandles::make_local(env, result);
3366 JVM_END
3367
3368
3369 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3370 JVMWrapper("JVM_NewMultiArray");
3371 JvmtiVMObjectAllocEventCollector oam;
3372 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3373 oop element_mirror = JNIHandles::resolve(eltClass);
3374 assert(dim_array->is_typeArray(), "just checking");
3375 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3376 return JNIHandles::make_local(env, result);
3377 JVM_END
3378
3379
3380 // Library support ///////////////////////////////////////////////////////////////////////////
3381
3382 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3383 //%note jvm_ct
3384 JVMWrapper("JVM_LoadLibrary");
3385 char ebuf[1024];
3386 void *load_result;
3387 {
3388 ThreadToNativeFromVM ttnfvm(thread);
3389 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3390 }
3391 if (load_result == NULL) {
3392 char msg[1024];
3393 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3394 // Since 'ebuf' may contain a string encoded using
3395 // platform encoding scheme, we need to pass
3396 // Exceptions::unsafe_to_utf8 to the new_exception method
3397 // as the last argument. See bug 6367357.
3398 Handle h_exception =
3399 Exceptions::new_exception(thread,
3400 vmSymbols::java_lang_UnsatisfiedLinkError(),
3401 msg, Exceptions::unsafe_to_utf8);
3402
3403 THROW_HANDLE_0(h_exception);
3404 }
3405 return load_result;
3406 JVM_END
3407
3408
3409 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3410 JVMWrapper("JVM_UnloadLibrary");
3411 os::dll_unload(handle);
3412 JVM_END
3413
3414
3415 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3416 JVMWrapper("JVM_FindLibraryEntry");
3417 return os::dll_lookup(handle, name);
3418 JVM_END
3419
3420
3421 // JNI version ///////////////////////////////////////////////////////////////////////////////
3422
3423 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3424 JVMWrapper("JVM_IsSupportedJNIVersion");
3425 return Threads::is_supported_jni_version_including_1_1(version);
3426 JVM_END
3427
3428
3429 // String support ///////////////////////////////////////////////////////////////////////////
3430
3431 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3432 JVMWrapper("JVM_InternString");
3433 JvmtiVMObjectAllocEventCollector oam;
3434 if (str == NULL) return NULL;
3435 oop string = JNIHandles::resolve_non_null(str);
3436 oop result = StringTable::intern(string, CHECK_NULL);
3437 return (jstring) JNIHandles::make_local(env, result);
3438 JVM_END
3439
3440
3441 // Raw monitor support //////////////////////////////////////////////////////////////////////
3442
3443 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3444 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3445 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3446 // that only works with java threads.
3447
3448
3449 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3450 VM_Exit::block_if_vm_exited();
3451 JVMWrapper("JVM_RawMonitorCreate");
3452 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3453 }
3454
3455
3456 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3457 VM_Exit::block_if_vm_exited();
3458 JVMWrapper("JVM_RawMonitorDestroy");
3459 delete ((Mutex*) mon);
3460 }
3461
3462
3463 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3464 VM_Exit::block_if_vm_exited();
3465 JVMWrapper("JVM_RawMonitorEnter");
3466 ((Mutex*) mon)->jvm_raw_lock();
3467 return 0;
3468 }
3469
3470
3471 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3472 VM_Exit::block_if_vm_exited();
3473 JVMWrapper("JVM_RawMonitorExit");
3474 ((Mutex*) mon)->jvm_raw_unlock();
3475 }
3476
3477
3478 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3479
3480 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3481 Handle loader, Handle protection_domain,
3482 jboolean throwError, TRAPS) {
3483 // Security Note:
3484 // The Java level wrapper will perform the necessary security check allowing
3485 // us to pass the NULL as the initiating class loader. The VM is responsible for
3486 // the checkPackageAccess relative to the initiating class loader via the
3487 // protection_domain. The protection_domain is passed as NULL by the java code
3488 // if there is no security manager in 3-arg Class.forName().
3489 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3490
3491 // Check if we should initialize the class
3492 if (init && klass->is_instance_klass()) {
3493 klass->initialize(CHECK_NULL);
3494 }
3495 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3496 }
3497
3498
3499 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3500
3501 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3502 JVMWrapper("JVM_InvokeMethod");
3503 Handle method_handle;
3504 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3505 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3506 Handle receiver(THREAD, JNIHandles::resolve(obj));
3507 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3508 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3509 jobject res = JNIHandles::make_local(env, result);
3510 if (JvmtiExport::should_post_vm_object_alloc()) {
3511 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3512 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3513 if (java_lang_Class::is_primitive(ret_type)) {
3514 // Only for primitive type vm allocates memory for java object.
3515 // See box() method.
3516 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3517 }
3518 }
3519 return res;
3520 } else {
3521 THROW_0(vmSymbols::java_lang_StackOverflowError());
3522 }
3523 JVM_END
3524
3525
3526 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3527 JVMWrapper("JVM_NewInstanceFromConstructor");
3528 oop constructor_mirror = JNIHandles::resolve(c);
3529 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3530 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3531 jobject res = JNIHandles::make_local(env, result);
3532 if (JvmtiExport::should_post_vm_object_alloc()) {
3533 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3534 }
3535 return res;
3536 JVM_END
3537
3538 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3539
3540 JVM_LEAF(jboolean, JVM_SupportsCX8())
3541 JVMWrapper("JVM_SupportsCX8");
3542 return VM_Version::supports_cx8();
3543 JVM_END
3544
3545 // Returns an array of all live Thread objects (VM internal JavaThreads,
3546 // jvmti agent threads, and JNI attaching threads are skipped)
3547 // See CR 6404306 regarding JNI attaching threads
3548 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3549 ResourceMark rm(THREAD);
3550 ThreadsListEnumerator tle(THREAD, false, false);
3551 JvmtiVMObjectAllocEventCollector oam;
3552
3553 int num_threads = tle.num_threads();
3554 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3555 objArrayHandle threads_ah(THREAD, r);
3556
3557 for (int i = 0; i < num_threads; i++) {
3558 Handle h = tle.get_threadObj(i);
3559 threads_ah->obj_at_put(i, h());
3560 }
3561
3562 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3563 JVM_END
3564
3565
3566 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3567 // Return StackTraceElement[][], each element is the stack trace of a thread in
3568 // the corresponding entry in the given threads array
3569 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3570 JVMWrapper("JVM_DumpThreads");
3571 JvmtiVMObjectAllocEventCollector oam;
3572
3573 // Check if threads is null
3574 if (threads == NULL) {
3575 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3576 }
3577
3578 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3579 objArrayHandle ah(THREAD, a);
3580 int num_threads = ah->length();
3581 // check if threads is non-empty array
3582 if (num_threads == 0) {
3583 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3584 }
3585
3586 // check if threads is not an array of objects of Thread class
3587 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3588 if (k != SystemDictionary::Thread_klass()) {
3589 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3590 }
3591
3592 ResourceMark rm(THREAD);
3593
3594 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3595 for (int i = 0; i < num_threads; i++) {
3596 oop thread_obj = ah->obj_at(i);
3597 instanceHandle h(THREAD, (instanceOop) thread_obj);
3598 thread_handle_array->append(h);
3599 }
3600
3601 // The JavaThread references in thread_handle_array are validated
3602 // in VM_ThreadDump::doit().
3603 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3604 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3605
3606 JVM_END
3607
3608 // JVM monitoring and management support
3609 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3610 return Management::get_jmm_interface(version);
3611 JVM_END
3612
3613 // com.sun.tools.attach.VirtualMachine agent properties support
3614 //
3615 // Initialize the agent properties with the properties maintained in the VM
3616 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3617 JVMWrapper("JVM_InitAgentProperties");
3618 ResourceMark rm;
3619
3620 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3621
3622 PUTPROP(props, "sun.java.command", Arguments::java_command());
3623 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3624 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3625 return properties;
3626 JVM_END
3627
3628 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3629 {
3630 JVMWrapper("JVM_GetEnclosingMethodInfo");
3631 JvmtiVMObjectAllocEventCollector oam;
3632
3633 if (ofClass == NULL) {
3634 return NULL;
3635 }
3636 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3637 // Special handling for primitive objects
3638 if (java_lang_Class::is_primitive(mirror())) {
3639 return NULL;
3640 }
3641 Klass* k = java_lang_Class::as_Klass(mirror());
3642 if (!k->is_instance_klass()) {
3643 return NULL;
3644 }
3645 InstanceKlass* ik = InstanceKlass::cast(k);
3646 int encl_method_class_idx = ik->enclosing_method_class_index();
3647 if (encl_method_class_idx == 0) {
3648 return NULL;
3649 }
3650 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3651 objArrayHandle dest(THREAD, dest_o);
3652 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3653 dest->obj_at_put(0, enc_k->java_mirror());
3654 int encl_method_method_idx = ik->enclosing_method_method_index();
3655 if (encl_method_method_idx != 0) {
3656 Symbol* sym = ik->constants()->symbol_at(
3657 extract_low_short_from_int(
3658 ik->constants()->name_and_type_at(encl_method_method_idx)));
3659 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3660 dest->obj_at_put(1, str());
3661 sym = ik->constants()->symbol_at(
3662 extract_high_short_from_int(
3663 ik->constants()->name_and_type_at(encl_method_method_idx)));
3664 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3665 dest->obj_at_put(2, str());
3666 }
3667 return (jobjectArray) JNIHandles::make_local(dest());
3668 }
3669 JVM_END
3670
3671 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3672 {
3673 memset(info, 0, info_size);
3674
3675 info->jvm_version = Abstract_VM_Version::jvm_version();
3676 info->patch_version = Abstract_VM_Version::vm_patch_version();
3677
3678 // when we add a new capability in the jvm_version_info struct, we should also
3679 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3680 // counter defined in runtimeService.cpp.
3681 info->is_attach_supported = AttachListener::is_attach_supported();
3682 }
3683 JVM_END
3684
3685 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3686 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3687 ResourceMark rm(THREAD);
3688
3689 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3690 return NULL;
3691 }
3692
3693 char** vm_flags = Arguments::jvm_flags_array();
3694 char** vm_args = Arguments::jvm_args_array();
3695 int num_flags = Arguments::num_jvm_flags();
3696 int num_args = Arguments::num_jvm_args();
3697
3698 InstanceKlass* ik = SystemDictionary::String_klass();
3699 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3700 objArrayHandle result_h(THREAD, r);
3701
3702 int index = 0;
3703 for (int j = 0; j < num_flags; j++, index++) {
3704 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3705 result_h->obj_at_put(index, h());
3706 }
3707 for (int i = 0; i < num_args; i++, index++) {
3708 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3709 result_h->obj_at_put(index, h());
3710 }
3711 return (jobjectArray) JNIHandles::make_local(env, result_h());
3712 JVM_END
3713
3714 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3715 return os::get_signal_number(name);
3716 JVM_END