1 /*
2 * Copyright (c) 1997, 2015, 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 "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "gc_interface/collectedHeap.inline.hpp"
33 #include "interpreter/bytecode.hpp"
34 #include "memory/barrierSet.inline.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/fieldStreams.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/objArrayKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/method.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/jvmtiThreadState.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "prims/privilegedStack.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/atomic.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/init.hpp"
53 #include "runtime/interfaceSupport.hpp"
54 #include "runtime/java.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/jfieldIDWorkaround.hpp"
57 #include "runtime/orderAccess.inline.hpp"
58 #include "runtime/os.inline.hpp"
59 #include "runtime/perfData.hpp"
60 #include "runtime/reflection.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/vframe.hpp"
63 #include "runtime/vm_operations.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/management.hpp"
67 #include "services/threadService.hpp"
68 #include "trace/tracing.hpp"
69 #include "utilities/copy.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/dtrace.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/histogram.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/top.hpp"
76 #include "utilities/utf8.hpp"
77 #if INCLUDE_CDS
78 #include "classfile/sharedClassUtil.hpp"
79 #include "classfile/systemDictionaryShared.hpp"
80 #endif
81 #ifdef TARGET_OS_FAMILY_linux
82 # include "jvm_linux.h"
83 #endif
84 #ifdef TARGET_OS_FAMILY_solaris
85 # include "jvm_solaris.h"
86 #endif
87 #ifdef TARGET_OS_FAMILY_windows
88 # include "jvm_windows.h"
89 #endif
90 #ifdef TARGET_OS_FAMILY_aix
91 # include "jvm_aix.h"
92 #endif
93 #ifdef TARGET_OS_FAMILY_bsd
94 # include "jvm_bsd.h"
95 #endif
96
97 #include <errno.h>
98
99 /*
100 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
101 such ctors and calls MUST NOT come between an oop declaration/init and its
102 usage because if objects are move this may cause various memory stomps, bus
103 errors and segfaults. Here is a cookbook for causing so called "naked oop
104 failures":
105
106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
107 JVMWrapper("JVM_GetClassDeclaredFields");
108
109 // Object address to be held directly in mirror & not visible to GC
110 oop mirror = JNIHandles::resolve_non_null(ofClass);
111
112 // If this ctor can hit a safepoint, moving objects around, then
113 ComplexConstructor foo;
114
115 // Boom! mirror may point to JUNK instead of the intended object
116 (some dereference of mirror)
117
118 // Here's another call that may block for GC, making mirror stale
119 MutexLocker ml(some_lock);
120
121 // And here's an initializer that can result in a stale oop
122 // all in one step.
123 oop o = call_that_can_throw_exception(TRAPS);
124
125
126 The solution is to keep the oop declaration BELOW the ctor or function
127 call that might cause a GC, do another resolve to reassign the oop, or
128 consider use of a Handle instead of an oop so there is immunity from object
129 motion. But note that the "QUICK" entries below do not have a handlemark
130 and thus can only support use of handles passed in.
131 */
132
133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
134 ResourceMark rm;
135 int line_number = -1;
136 const char * source_file = NULL;
137 const char * trace = "explicit";
138 InstanceKlass* caller = NULL;
139 JavaThread* jthread = JavaThread::current();
140 if (jthread->has_last_Java_frame()) {
141 vframeStream vfst(jthread);
142
143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
148
149 Method* last_caller = NULL;
150
151 while (!vfst.at_end()) {
152 Method* m = vfst.method();
153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
156 break;
157 }
158 last_caller = m;
159 vfst.next();
160 }
161 // if this is called from Class.forName0 and that is called from Class.forName,
162 // then print the caller of Class.forName. If this is Class.loadClass, then print
163 // that caller, otherwise keep quiet since this should be picked up elsewhere.
164 bool found_it = false;
165 if (!vfst.at_end() &&
166 vfst.method()->method_holder()->name()->equals(vmSymbols::java_lang_Class()) &&
167 vfst.method()->name()->equals(vmSymbols::forName0_name())) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name()->equals(vmSymbols::java_lang_Class()) &&
171 vfst.method()->name()->equals(vmSymbols::forName_name())) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name()->equals(
177 vmSymbols::java_lang_ClassLoader()) &&
178 (last_caller->name()->equals(vmSymbols::loadClassInternal_name()) ||
179 last_caller->name()->equals(vmSymbols::loadClass_name()))) {
180 found_it = true;
181 } else if (!vfst.at_end()) {
182 if (vfst.method()->is_native()) {
183 // JNI call
184 found_it = true;
185 }
186 }
187 if (found_it && !vfst.at_end()) {
188 // found the caller
189 caller = vfst.method()->method_holder();
190 line_number = vfst.method()->line_number_from_bci(vfst.bci());
191 if (line_number == -1) {
192 // show method name if it's a native method
193 trace = vfst.method()->name_and_sig_as_C_string();
194 }
195 Symbol* s = caller->source_file_name();
196 if (s != NULL) {
197 source_file = s->as_C_string();
198 }
199 }
200 }
201 if (caller != NULL) {
202 if (to_class != caller) {
203 const char * from = caller->external_name();
204 const char * to = to_class->external_name();
205 // print in a single call to reduce interleaving between threads
206 if (source_file != NULL) {
207 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
208 } else {
209 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
210 }
211 }
212 }
213 }
214
215 void trace_class_resolution(Klass* to_class) {
216 EXCEPTION_MARK;
217 trace_class_resolution_impl(to_class, THREAD);
218 if (HAS_PENDING_EXCEPTION) {
219 CLEAR_PENDING_EXCEPTION;
220 }
221 }
222
223 // Wrapper to trace JVM functions
224
225 #ifdef ASSERT
226 class JVMTraceWrapper : public StackObj {
227 public:
228 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
229 if (TraceJVMCalls) {
230 va_list ap;
231 va_start(ap, format);
232 tty->print("JVM ");
233 tty->vprint_cr(format, ap);
234 va_end(ap);
235 }
236 }
237 };
238
239 Histogram* JVMHistogram;
240 volatile jint JVMHistogram_lock = 0;
241
242 class JVMHistogramElement : public HistogramElement {
243 public:
244 JVMHistogramElement(const char* name);
245 };
246
247 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
248 _name = elementName;
249 uintx count = 0;
250
251 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
252 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
253 count +=1;
254 if ( (WarnOnStalledSpinLock > 0)
255 && (count % WarnOnStalledSpinLock == 0)) {
256 warning("JVMHistogram_lock seems to be stalled");
257 }
258 }
259 }
260
261 if(JVMHistogram == NULL)
262 JVMHistogram = new Histogram("JVM Call Counts",100);
263
264 JVMHistogram->add_element(this);
265 Atomic::dec(&JVMHistogram_lock);
266 }
267
268 #define JVMCountWrapper(arg) \
269 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
270 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
271
272 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
273 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
274 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
275 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
276 #else
277 #define JVMWrapper(arg1)
278 #define JVMWrapper2(arg1, arg2)
279 #define JVMWrapper3(arg1, arg2, arg3)
280 #define JVMWrapper4(arg1, arg2, arg3, arg4)
281 #endif
282
283
284 // Interface version /////////////////////////////////////////////////////////////////////
285
286
287 JVM_LEAF(jint, JVM_GetInterfaceVersion())
288 return JVM_INTERFACE_VERSION;
289 JVM_END
290
291
292 // java.lang.System //////////////////////////////////////////////////////////////////////
293
294
295 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
296 JVMWrapper("JVM_CurrentTimeMillis");
297 return os::javaTimeMillis();
298 JVM_END
299
300 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
301 JVMWrapper("JVM_NanoTime");
302 return os::javaTimeNanos();
303 JVM_END
304
305 // The function below is actually exposed by sun.misc.VM and not
306 // java.lang.System, but we choose to keep it here so that it stays next
307 // to JVM_CurrentTimeMillis and JVM_NanoTime
308
309 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
310 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
311
312 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
313 JVMWrapper("JVM_GetNanoTimeAdjustment");
314 jlong seconds;
315 jlong nanos;
316
317 os::javaTimeSystemUTC(seconds, nanos);
318
319 // We're going to verify that the result can fit in a long.
320 // For that we need the difference in seconds between 'seconds'
321 // and 'offset_secs' to be such that:
322 // |seconds - offset_secs| < (2^63/10^9)
323 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
324 // which makes |seconds - offset_secs| < 2^33
325 // and we will prefer +/- 2^32 as the maximum acceptable diff
326 // as 2^32 has a more natural feel than 2^33...
327 //
328 // So if |seconds - offset_secs| >= 2^32 - we return a special
329 // sentinel value (-1) which the caller should take as an
330 // exception value indicating that the offset given to us is
331 // too far from range of the current time - leading to too big
332 // a nano adjustment. The caller is expected to recover by
333 // computing a more accurate offset and calling this method
334 // again. (For the record 2^32 secs is ~136 years, so that
335 // should rarely happen)
336 //
337 jlong diff = seconds - offset_secs;
338 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
339 return -1; // sentinel value: the offset is too far off the target
340 }
341
342 // return the adjustment. If you compute a time by adding
343 // this number of nanoseconds along with the number of seconds
344 // in the offset you should get the current UTC time.
345 return (diff * (jlong)1000000000) + nanos;
346 JVM_END
347
348 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
349 jobject dst, jint dst_pos, jint length))
350 JVMWrapper("JVM_ArrayCopy");
351 // Check if we have null pointers
352 if (src == NULL || dst == NULL) {
353 THROW(vmSymbols::java_lang_NullPointerException());
354 }
355 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
356 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
357 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
358 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
359 // Do copy
360 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
361 JVM_END
362
363
364 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
365 JavaValue r(T_OBJECT);
366 // public synchronized Object put(Object key, Object value);
367 HandleMark hm(THREAD);
368 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
369 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
370 JavaCalls::call_virtual(&r,
371 props,
372 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
373 vmSymbols::put_name(),
374 vmSymbols::object_object_object_signature(),
375 key_str,
376 value_str,
377 THREAD);
378 }
379
380
381 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
382
383
384 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
385 JVMWrapper("JVM_InitProperties");
386 ResourceMark rm;
387
388 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
389
390 // System property list includes both user set via -D option and
391 // jvm system specific properties.
392 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
393 PUTPROP(props, p->key(), p->value());
394 }
395
396 // Convert the -XX:MaxDirectMemorySize= command line flag
397 // to the sun.nio.MaxDirectMemorySize property.
398 // Do this after setting user properties to prevent people
399 // from setting the value with a -D option, as requested.
400 {
401 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
402 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
403 } else {
404 char as_chars[256];
405 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize);
406 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
407 }
408 }
409
410 // JVM monitoring and management support
411 // Add the sun.management.compiler property for the compiler's name
412 {
413 #undef CSIZE
414 #if defined(_LP64) || defined(_WIN64)
415 #define CSIZE "64-Bit "
416 #else
417 #define CSIZE
418 #endif // 64bit
419
420 #ifdef TIERED
421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
422 #else
423 #if defined(COMPILER1)
424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
425 #elif defined(COMPILER2)
426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
427 #else
428 const char* compiler_name = "";
429 #endif // compilers
430 #endif // TIERED
431
432 if (*compiler_name != '\0' &&
433 (Arguments::mode() != Arguments::_int)) {
434 PUTPROP(props, "sun.management.compiler", compiler_name);
435 }
436 }
437
438 return properties;
439 JVM_END
440
441
442 /*
443 * Return the temporary directory that the VM uses for the attach
444 * and perf data files.
445 *
446 * It is important that this directory is well-known and the
447 * same for all VM instances. It cannot be affected by configuration
448 * variables such as java.io.tmpdir.
449 */
450 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
451 JVMWrapper("JVM_GetTemporaryDirectory");
452 HandleMark hm(THREAD);
453 const char* temp_dir = os::get_temp_directory();
454 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
455 return (jstring) JNIHandles::make_local(env, h());
456 JVM_END
457
458
459 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
460
461 extern volatile jint vm_created;
462
463 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
464 before_exit(thread);
465 vm_exit(code);
466 JVM_END
467
468
469 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
470 JVMWrapper("JVM_GC");
471 if (!DisableExplicitGC) {
472 Universe::heap()->collect(GCCause::_java_lang_system_gc);
473 }
474 JVM_END
475
476
477 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
478 JVMWrapper("JVM_MaxObjectInspectionAge");
479 return Universe::heap()->millis_since_last_gc();
480 JVM_END
481
482
483 static inline jlong convert_size_t_to_jlong(size_t val) {
484 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
485 NOT_LP64 (return (jlong)val;)
486 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
487 }
488
489 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
490 JVMWrapper("JVM_TotalMemory");
491 size_t n = Universe::heap()->capacity();
492 return convert_size_t_to_jlong(n);
493 JVM_END
494
495
496 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
497 JVMWrapper("JVM_FreeMemory");
498 CollectedHeap* ch = Universe::heap();
499 size_t n;
500 {
501 MutexLocker x(Heap_lock);
502 n = ch->capacity() - ch->used();
503 }
504 return convert_size_t_to_jlong(n);
505 JVM_END
506
507
508 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
509 JVMWrapper("JVM_MaxMemory");
510 size_t n = Universe::heap()->max_capacity();
511 return convert_size_t_to_jlong(n);
512 JVM_END
513
514
515 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
516 JVMWrapper("JVM_ActiveProcessorCount");
517 return os::active_processor_count();
518 JVM_END
519
520
521
522 // java.lang.Throwable //////////////////////////////////////////////////////
523
524
525 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
526 JVMWrapper("JVM_FillInStackTrace");
527 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
528 java_lang_Throwable::fill_in_stack_trace(exception);
529 JVM_END
530
531
532 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
533 JVMWrapper("JVM_GetStackTraceDepth");
534 oop exception = JNIHandles::resolve(throwable);
535 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
536 JVM_END
537
538
539 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
540 JVMWrapper("JVM_GetStackTraceElement");
541 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
542 oop exception = JNIHandles::resolve(throwable);
543 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
544 return JNIHandles::make_local(env, element);
545 JVM_END
546
547
548 // java.lang.Object ///////////////////////////////////////////////
549
550
551 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
552 JVMWrapper("JVM_IHashCode");
553 // as implemented in the classic virtual machine; return 0 if object is NULL
554 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
555 JVM_END
556
557
558 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
559 JVMWrapper("JVM_MonitorWait");
560 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
561 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
562 if (JvmtiExport::should_post_monitor_wait()) {
563 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
564
565 // The current thread already owns the monitor and it has not yet
566 // been added to the wait queue so the current thread cannot be
567 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
568 // event handler cannot accidentally consume an unpark() meant for
569 // the ParkEvent associated with this ObjectMonitor.
570 }
571 ObjectSynchronizer::wait(obj, ms, CHECK);
572 JVM_END
573
574
575 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
576 JVMWrapper("JVM_MonitorNotify");
577 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
578 ObjectSynchronizer::notify(obj, CHECK);
579 JVM_END
580
581
582 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
583 JVMWrapper("JVM_MonitorNotifyAll");
584 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
585 ObjectSynchronizer::notifyall(obj, CHECK);
586 JVM_END
587
588
589 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
590 JVMWrapper("JVM_Clone");
591 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
592 const KlassHandle klass (THREAD, obj->klass());
593 JvmtiVMObjectAllocEventCollector oam;
594
595 #ifdef ASSERT
596 // Just checking that the cloneable flag is set correct
597 if (obj->is_array()) {
598 guarantee(klass->is_cloneable(), "all arrays are cloneable");
599 } else {
600 guarantee(obj->is_instance(), "should be instanceOop");
601 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
602 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
603 }
604 #endif
605
606 // Check if class of obj supports the Cloneable interface.
607 // All arrays are considered to be cloneable (See JLS 20.1.5)
608 if (!klass->is_cloneable()) {
609 ResourceMark rm(THREAD);
610 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
611 }
612
613 // Make shallow object copy
614 const int size = obj->size();
615 oop new_obj_oop = NULL;
616 if (obj->is_array()) {
617 const int length = ((arrayOop)obj())->length();
618 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
619 } else {
620 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
621 }
622
623 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
624 // is modifying a reference field in the clonee, a non-oop-atomic copy might
625 // be suspended in the middle of copying the pointer and end up with parts
626 // of two different pointers in the field. Subsequent dereferences will crash.
627 // 4846409: an oop-copy of objects with long or double fields or arrays of same
628 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
629 // of oops. We know objects are aligned on a minimum of an jlong boundary.
630 // The same is true of StubRoutines::object_copy and the various oop_copy
631 // variants, and of the code generated by the inline_native_clone intrinsic.
632 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
633 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
634 (size_t)align_object_size(size) / HeapWordsPerLong);
635 // Clear the header
636 new_obj_oop->init_mark();
637
638 // Store check (mark entire object and let gc sort it out)
639 BarrierSet* bs = Universe::heap()->barrier_set();
640 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
641 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
642
643 Handle new_obj(THREAD, new_obj_oop);
644 // Special handling for MemberNames. Since they contain Method* metadata, they
645 // must be registered so that RedefineClasses can fix metadata contained in them.
646 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
647 java_lang_invoke_MemberName::is_method(new_obj())) {
648 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
649 // MemberName may be unresolved, so doesn't need registration until resolved.
650 if (method != NULL) {
651 methodHandle m(THREAD, method);
652 // This can safepoint and redefine method, so need both new_obj and method
653 // in a handle, for two different reasons. new_obj can move, method can be
654 // deleted if nothing is using it on the stack.
655 m->method_holder()->add_member_name(new_obj());
656 }
657 }
658
659 // Caution: this involves a java upcall, so the clone should be
660 // "gc-robust" by this stage.
661 if (klass->has_finalizer()) {
662 assert(obj->is_instance(), "should be instanceOop");
663 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
664 new_obj = Handle(THREAD, new_obj_oop);
665 }
666
667 return JNIHandles::make_local(env, new_obj());
668 JVM_END
669
670 // java.io.File ///////////////////////////////////////////////////////////////
671
672 JVM_LEAF(char*, JVM_NativePath(char* path))
673 JVMWrapper2("JVM_NativePath (%s)", path);
674 return os::native_path(path);
675 JVM_END
676
677
678 // Misc. class handling ///////////////////////////////////////////////////////////
679
680
681 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
682 JVMWrapper("JVM_GetCallerClass");
683
684 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
685 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
686 // temporarily for existing code to use until a replacement API is defined.
687 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
688 Klass* k = thread->security_get_caller_class(depth);
689 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
690 }
691
692 // Getting the class of the caller frame.
693 //
694 // The call stack at this point looks something like this:
695 //
696 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
697 // [1] [ @CallerSensitive API.method ]
698 // [.] [ (skipped intermediate frames) ]
699 // [n] [ caller ]
700 vframeStream vfst(thread);
701 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
702 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
703 Method* m = vfst.method();
704 assert(m != NULL, "sanity");
705 switch (n) {
706 case 0:
707 // This must only be called from Reflection.getCallerClass
708 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
709 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
710 }
711 // fall-through
712 case 1:
713 // Frame 0 and 1 must be caller sensitive.
714 if (!m->caller_sensitive()) {
715 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
716 }
717 break;
718 default:
719 if (!m->is_ignored_by_security_stack_walk()) {
720 // We have reached the desired frame; return the holder class.
721 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
722 }
723 break;
724 }
725 }
726 return NULL;
727 JVM_END
728
729
730 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
731 JVMWrapper("JVM_FindPrimitiveClass");
732 oop mirror = NULL;
733 BasicType t = name2type(utf);
734 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
735 mirror = Universe::java_mirror(t);
736 }
737 if (mirror == NULL) {
738 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
739 } else {
740 return (jclass) JNIHandles::make_local(env, mirror);
741 }
742 JVM_END
743
744
745 // Returns a class loaded by the bootstrap class loader; or null
746 // if not found. ClassNotFoundException is not thrown.
747 // FindClassFromBootLoader is exported to the launcher for windows.
748 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
749 const char* name))
750 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
751
752 // Java libraries should ensure that name is never null...
753 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
754 // It's impossible to create this class; the name cannot fit
755 // into the constant pool.
756 return NULL;
757 }
758
759 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
760 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
761 if (k == NULL) {
762 return NULL;
763 }
764
765 if (TraceClassResolution) {
766 trace_class_resolution(k);
767 }
768 return (jclass) JNIHandles::make_local(env, k->java_mirror());
769 JVM_END
770
771 // Find a class with this name in this loader, using the caller's protection domain.
772 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
773 jboolean init, jobject loader,
774 jclass caller))
775 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
776 // Java libraries should ensure that name is never null...
777 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
778 // It's impossible to create this class; the name cannot fit
779 // into the constant pool.
780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
781 }
782
783 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
784
785 oop loader_oop = JNIHandles::resolve(loader);
786 oop from_class = JNIHandles::resolve(caller);
787 oop protection_domain = NULL;
788 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
789 // NPE. Put it in another way, the bootstrap class loader has all permission and
790 // thus no checkPackageAccess equivalence in the VM class loader.
791 // The caller is also passed as NULL by the java code if there is no security
792 // manager to avoid the performance cost of getting the calling class.
793 if (from_class != NULL && loader_oop != NULL) {
794 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
795 }
796
797 Handle h_loader(THREAD, loader_oop);
798 Handle h_prot(THREAD, protection_domain);
799 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
800 h_prot, false, THREAD);
801
802 if (TraceClassResolution && result != NULL) {
803 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
804 }
805 return result;
806 JVM_END
807
808 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
809 jboolean init, jclass from))
810 JVMWrapper2("JVM_FindClassFromClass %s", name);
811 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
812 // It's impossible to create this class; the name cannot fit
813 // into the constant pool.
814 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
815 }
816 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
817 oop from_class_oop = JNIHandles::resolve(from);
818 Klass* from_class = (from_class_oop == NULL)
819 ? (Klass*)NULL
820 : java_lang_Class::as_Klass(from_class_oop);
821 oop class_loader = NULL;
822 oop protection_domain = NULL;
823 if (from_class != NULL) {
824 class_loader = from_class->class_loader();
825 protection_domain = from_class->protection_domain();
826 }
827 Handle h_loader(THREAD, class_loader);
828 Handle h_prot (THREAD, protection_domain);
829 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
830 h_prot, true, thread);
831
832 if (TraceClassResolution && result != NULL) {
833 // this function is generally only used for class loading during verification.
834 ResourceMark rm;
835 oop from_mirror = JNIHandles::resolve_non_null(from);
836 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
837 const char * from_name = from_class->external_name();
838
839 oop mirror = JNIHandles::resolve_non_null(result);
840 Klass* to_class = java_lang_Class::as_Klass(mirror);
841 const char * to = to_class->external_name();
842 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
843 }
844
845 return result;
846 JVM_END
847
848 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
849 if (loader.is_null()) {
850 return;
851 }
852
853 // check whether the current caller thread holds the lock or not.
854 // If not, increment the corresponding counter
855 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
856 ObjectSynchronizer::owner_self) {
857 counter->inc();
858 }
859 }
860
861 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
862 // and JVM_DefineClassWithSourceCond()
863 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
864 jobject loader, const jbyte *buf,
865 jsize len, jobject pd, const char *source,
866 jboolean verify, TRAPS) {
867 if (source == NULL) source = "__JVM_DefineClass__";
868
869 assert(THREAD->is_Java_thread(), "must be a JavaThread");
870 JavaThread* jt = (JavaThread*) THREAD;
871
872 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
873 ClassLoader::perf_define_appclass_selftime(),
874 ClassLoader::perf_define_appclasses(),
875 jt->get_thread_stat()->perf_recursion_counts_addr(),
876 jt->get_thread_stat()->perf_timers_addr(),
877 PerfClassTraceTime::DEFINE_CLASS);
878
879 if (UsePerfData) {
880 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
881 }
882
883 // Since exceptions can be thrown, class initialization can take place
884 // if name is NULL no check for class name in .class stream has to be made.
885 TempNewSymbol class_name = NULL;
886 if (name != NULL) {
887 const int str_len = (int)strlen(name);
888 if (str_len > Symbol::max_length()) {
889 // It's impossible to create this class; the name cannot fit
890 // into the constant pool.
891 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
892 }
893 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
894 }
895
896 ResourceMark rm(THREAD);
897 ClassFileStream st((u1*) buf, len, (char *)source);
898 Handle class_loader (THREAD, JNIHandles::resolve(loader));
899 if (UsePerfData) {
900 is_lock_held_by_thread(class_loader,
901 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
902 THREAD);
903 }
904 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
905 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
906 protection_domain, &st,
907 verify != 0,
908 CHECK_NULL);
909
910 if (TraceClassResolution && k != NULL) {
911 trace_class_resolution(k);
912 }
913
914 return (jclass) JNIHandles::make_local(env, k->java_mirror());
915 }
916
917
918 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
919 JVMWrapper2("JVM_DefineClass %s", name);
920
921 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
922 JVM_END
923
924
925 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
926 JVMWrapper2("JVM_DefineClassWithSource %s", name);
927
928 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
929 JVM_END
930
931 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
932 jobject loader, const jbyte *buf,
933 jsize len, jobject pd,
934 const char *source, jboolean verify))
935 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
936
937 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
938 JVM_END
939
940 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
941 JVMWrapper("JVM_FindLoadedClass");
942 ResourceMark rm(THREAD);
943
944 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
945 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
946
947 const char* str = java_lang_String::as_utf8_string(string());
948 // Sanity check, don't expect null
949 if (str == NULL) return NULL;
950
951 const int str_len = (int)strlen(str);
952 if (str_len > Symbol::max_length()) {
953 // It's impossible to create this class; the name cannot fit
954 // into the constant pool.
955 return NULL;
956 }
957 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
958
959 // Security Note:
960 // The Java level wrapper will perform the necessary security check allowing
961 // us to pass the NULL as the initiating class loader.
962 Handle h_loader(THREAD, JNIHandles::resolve(loader));
963 if (UsePerfData) {
964 is_lock_held_by_thread(h_loader,
965 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
966 THREAD);
967 }
968
969 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
970 h_loader,
971 Handle(),
972 CHECK_NULL);
973 #if INCLUDE_CDS
974 if (k == NULL) {
975 // If the class is not already loaded, try to see if it's in the shared
976 // archive for the current classloader (h_loader).
977 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
978 klass_name, h_loader, CHECK_NULL);
979 k = ik();
980 }
981 #endif
982 return (k == NULL) ? NULL :
983 (jclass) JNIHandles::make_local(env, k->java_mirror());
984 JVM_END
985
986
987 // Reflection support //////////////////////////////////////////////////////////////////////////////
988
989 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
990 assert (cls != NULL, "illegal class");
991 JVMWrapper("JVM_GetClassName");
992 JvmtiVMObjectAllocEventCollector oam;
993 ResourceMark rm(THREAD);
994 const char* name;
995 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
996 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
997 } else {
998 // Consider caching interned string in Klass
999 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1000 assert(k->is_klass(), "just checking");
1001 name = k->external_name();
1002 }
1003 oop result = StringTable::intern((char*) name, CHECK_NULL);
1004 return (jstring) JNIHandles::make_local(env, result);
1005 JVM_END
1006
1007
1008 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1009 JVMWrapper("JVM_GetClassInterfaces");
1010 JvmtiVMObjectAllocEventCollector oam;
1011 oop mirror = JNIHandles::resolve_non_null(cls);
1012
1013 // Special handling for primitive objects
1014 if (java_lang_Class::is_primitive(mirror)) {
1015 // Primitive objects does not have any interfaces
1016 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1017 return (jobjectArray) JNIHandles::make_local(env, r);
1018 }
1019
1020 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1021 // Figure size of result array
1022 int size;
1023 if (klass->oop_is_instance()) {
1024 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1025 } else {
1026 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1027 size = 2;
1028 }
1029
1030 // Allocate result array
1031 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1032 objArrayHandle result (THREAD, r);
1033 // Fill in result
1034 if (klass->oop_is_instance()) {
1035 // Regular instance klass, fill in all local interfaces
1036 for (int index = 0; index < size; index++) {
1037 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1038 result->obj_at_put(index, k->java_mirror());
1039 }
1040 } else {
1041 // All arrays implement java.lang.Cloneable and java.io.Serializable
1042 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1043 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1044 }
1045 return (jobjectArray) JNIHandles::make_local(env, result());
1046 JVM_END
1047
1048
1049 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1050 JVMWrapper("JVM_IsInterface");
1051 oop mirror = JNIHandles::resolve_non_null(cls);
1052 if (java_lang_Class::is_primitive(mirror)) {
1053 return JNI_FALSE;
1054 }
1055 Klass* k = java_lang_Class::as_Klass(mirror);
1056 jboolean result = k->is_interface();
1057 assert(!result || k->oop_is_instance(),
1058 "all interfaces are instance types");
1059 // The compiler intrinsic for isInterface tests the
1060 // Klass::_access_flags bits in the same way.
1061 return result;
1062 JVM_END
1063
1064
1065 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1066 JVMWrapper("JVM_GetClassSigners");
1067 JvmtiVMObjectAllocEventCollector oam;
1068 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1069 // There are no signers for primitive types
1070 return NULL;
1071 }
1072
1073 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1074
1075 // If there are no signers set in the class, or if the class
1076 // is an array, return NULL.
1077 if (signers == NULL) return NULL;
1078
1079 // copy of the signers array
1080 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1081 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1082 for (int index = 0; index < signers->length(); index++) {
1083 signers_copy->obj_at_put(index, signers->obj_at(index));
1084 }
1085
1086 // return the copy
1087 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1088 JVM_END
1089
1090
1091 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1092 JVMWrapper("JVM_SetClassSigners");
1093 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1094 // This call is ignored for primitive types and arrays.
1095 // Signers are only set once, ClassLoader.java, and thus shouldn't
1096 // be called with an array. Only the bootstrap loader creates arrays.
1097 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1098 if (k->oop_is_instance()) {
1099 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1100 }
1101 }
1102 JVM_END
1103
1104
1105 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1106 JVMWrapper("JVM_GetProtectionDomain");
1107 if (JNIHandles::resolve(cls) == NULL) {
1108 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1109 }
1110
1111 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1112 // Primitive types does not have a protection domain.
1113 return NULL;
1114 }
1115
1116 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1117 return (jobject) JNIHandles::make_local(env, pd);
1118 JVM_END
1119
1120
1121 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1122 // If there is a security manager and protection domain, check the access
1123 // in the protection domain, otherwise it is authorized.
1124 if (java_lang_System::has_security_manager()) {
1125
1126 // For bootstrapping, if pd implies method isn't in the JDK, allow
1127 // this context to revert to older behavior.
1128 // In this case the isAuthorized field in AccessControlContext is also not
1129 // present.
1130 if (Universe::protection_domain_implies_method() == NULL) {
1131 return true;
1132 }
1133
1134 // Whitelist certain access control contexts
1135 if (java_security_AccessControlContext::is_authorized(context)) {
1136 return true;
1137 }
1138
1139 oop prot = klass->protection_domain();
1140 if (prot != NULL) {
1141 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1142 // in the new wrapper.
1143 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1144 Handle h_prot(THREAD, prot);
1145 JavaValue result(T_BOOLEAN);
1146 JavaCallArguments args(h_prot);
1147 JavaCalls::call(&result, m, &args, CHECK_false);
1148 return (result.get_jboolean() != 0);
1149 }
1150 }
1151 return true;
1152 }
1153
1154 // Create an AccessControlContext with a protection domain with null codesource
1155 // and null permissions - which gives no permissions.
1156 oop create_dummy_access_control_context(TRAPS) {
1157 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1158 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1159 // Call constructor ProtectionDomain(null, null);
1160 JavaValue result(T_VOID);
1161 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1162 vmSymbols::object_initializer_name(),
1163 vmSymbols::codesource_permissioncollection_signature(),
1164 Handle(), Handle(), CHECK_NULL);
1165
1166 // new ProtectionDomain[] {pd};
1167 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1168 context->obj_at_put(0, obj());
1169
1170 // new AccessControlContext(new ProtectionDomain[] {pd})
1171 objArrayHandle h_context(THREAD, context);
1172 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1173 return acc;
1174 }
1175
1176 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1177 JVMWrapper("JVM_DoPrivileged");
1178
1179 if (action == NULL) {
1180 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1181 }
1182
1183 // Compute the frame initiating the do privileged operation and setup the privileged stack
1184 vframeStream vfst(thread);
1185 vfst.security_get_caller_frame(1);
1186
1187 if (vfst.at_end()) {
1188 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1189 }
1190
1191 Method* method = vfst.method();
1192 instanceKlassHandle klass (THREAD, method->method_holder());
1193
1194 // Check that action object understands "Object run()"
1195 Handle h_context;
1196 if (context != NULL) {
1197 h_context = Handle(THREAD, JNIHandles::resolve(context));
1198 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1199 if (!authorized) {
1200 // Create an unprivileged access control object and call it's run function
1201 // instead.
1202 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1203 h_context = Handle(THREAD, noprivs);
1204 }
1205 }
1206
1207 // Check that action object understands "Object run()"
1208 Handle object (THREAD, JNIHandles::resolve(action));
1209
1210 // get run() method
1211 Method* m_oop = object->klass()->uncached_lookup_method(
1212 vmSymbols::run_method_name(),
1213 vmSymbols::void_object_signature(),
1214 Klass::find_overpass);
1215 methodHandle m (THREAD, m_oop);
1216 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1217 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1218 }
1219
1220 // Stack allocated list of privileged stack elements
1221 PrivilegedElement pi;
1222 if (!vfst.at_end()) {
1223 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1224 thread->set_privileged_stack_top(&pi);
1225 }
1226
1227
1228 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1229 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1230 Handle pending_exception;
1231 JavaValue result(T_OBJECT);
1232 JavaCallArguments args(object);
1233 JavaCalls::call(&result, m, &args, THREAD);
1234
1235 // done with action, remove ourselves from the list
1236 if (!vfst.at_end()) {
1237 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1238 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1239 }
1240
1241 if (HAS_PENDING_EXCEPTION) {
1242 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1243 CLEAR_PENDING_EXCEPTION;
1244 // JVMTI has already reported the pending exception
1245 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1246 if (THREAD->is_Java_thread()) {
1247 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1248 }
1249 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1250 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1251 // Throw a java.security.PrivilegedActionException(Exception e) exception
1252 JavaCallArguments args(pending_exception);
1253 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1254 vmSymbols::exception_void_signature(),
1255 &args);
1256 }
1257 }
1258
1259 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1260 return JNIHandles::make_local(env, (oop) result.get_jobject());
1261 JVM_END
1262
1263
1264 // Returns the inherited_access_control_context field of the running thread.
1265 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1266 JVMWrapper("JVM_GetInheritedAccessControlContext");
1267 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1268 return JNIHandles::make_local(env, result);
1269 JVM_END
1270
1271 class RegisterArrayForGC {
1272 private:
1273 JavaThread *_thread;
1274 public:
1275 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1276 _thread = thread;
1277 _thread->register_array_for_gc(array);
1278 }
1279
1280 ~RegisterArrayForGC() {
1281 _thread->register_array_for_gc(NULL);
1282 }
1283 };
1284
1285
1286 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1287 JVMWrapper("JVM_GetStackAccessControlContext");
1288 if (!UsePrivilegedStack) return NULL;
1289
1290 ResourceMark rm(THREAD);
1291 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1292 JvmtiVMObjectAllocEventCollector oam;
1293
1294 // count the protection domains on the execution stack. We collapse
1295 // duplicate consecutive protection domains into a single one, as
1296 // well as stopping when we hit a privileged frame.
1297
1298 // Use vframeStream to iterate through Java frames
1299 vframeStream vfst(thread);
1300
1301 oop previous_protection_domain = NULL;
1302 Handle privileged_context(thread, NULL);
1303 bool is_privileged = false;
1304 oop protection_domain = NULL;
1305
1306 for(; !vfst.at_end(); vfst.next()) {
1307 // get method of frame
1308 Method* method = vfst.method();
1309 intptr_t* frame_id = vfst.frame_id();
1310
1311 // check the privileged frames to see if we have a match
1312 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1313 // this frame is privileged
1314 is_privileged = true;
1315 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1316 protection_domain = thread->privileged_stack_top()->protection_domain();
1317 } else {
1318 protection_domain = method->method_holder()->protection_domain();
1319 }
1320
1321 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1322 local_array->push(protection_domain);
1323 previous_protection_domain = protection_domain;
1324 }
1325
1326 if (is_privileged) break;
1327 }
1328
1329
1330 // either all the domains on the stack were system domains, or
1331 // we had a privileged system domain
1332 if (local_array->is_empty()) {
1333 if (is_privileged && privileged_context.is_null()) return NULL;
1334
1335 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1336 return JNIHandles::make_local(env, result);
1337 }
1338
1339 // the resource area must be registered in case of a gc
1340 RegisterArrayForGC ragc(thread, local_array);
1341 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1342 local_array->length(), CHECK_NULL);
1343 objArrayHandle h_context(thread, context);
1344 for (int index = 0; index < local_array->length(); index++) {
1345 h_context->obj_at_put(index, local_array->at(index));
1346 }
1347
1348 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1349
1350 return JNIHandles::make_local(env, result);
1351 JVM_END
1352
1353
1354 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1355 JVMWrapper("JVM_IsArrayClass");
1356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1357 return (k != NULL) && k->oop_is_array() ? true : false;
1358 JVM_END
1359
1360
1361 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1362 JVMWrapper("JVM_IsPrimitiveClass");
1363 oop mirror = JNIHandles::resolve_non_null(cls);
1364 return (jboolean) java_lang_Class::is_primitive(mirror);
1365 JVM_END
1366
1367
1368 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1369 JVMWrapper("JVM_GetClassModifiers");
1370 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1371 // Primitive type
1372 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1373 }
1374
1375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1376 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1377 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1378 return k->modifier_flags();
1379 JVM_END
1380
1381
1382 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1383
1384 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1385 JvmtiVMObjectAllocEventCollector oam;
1386 // ofClass is a reference to a java_lang_Class object. The mirror object
1387 // of an InstanceKlass
1388
1389 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1390 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1391 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1392 return (jobjectArray)JNIHandles::make_local(env, result);
1393 }
1394
1395 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1396 InnerClassesIterator iter(k);
1397
1398 if (iter.length() == 0) {
1399 // Neither an inner nor outer class
1400 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1401 return (jobjectArray)JNIHandles::make_local(env, result);
1402 }
1403
1404 // find inner class info
1405 constantPoolHandle cp(thread, k->constants());
1406 int length = iter.length();
1407
1408 // Allocate temp. result array
1409 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1410 objArrayHandle result (THREAD, r);
1411 int members = 0;
1412
1413 for (; !iter.done(); iter.next()) {
1414 int ioff = iter.inner_class_info_index();
1415 int ooff = iter.outer_class_info_index();
1416
1417 if (ioff != 0 && ooff != 0) {
1418 // Check to see if the name matches the class we're looking for
1419 // before attempting to find the class.
1420 if (cp->klass_name_at_matches(k, ooff)) {
1421 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1422 if (outer_klass == k()) {
1423 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1424 instanceKlassHandle inner_klass (THREAD, ik);
1425
1426 // Throws an exception if outer klass has not declared k as
1427 // an inner klass
1428 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1429
1430 result->obj_at_put(members, inner_klass->java_mirror());
1431 members++;
1432 }
1433 }
1434 }
1435 }
1436
1437 if (members != length) {
1438 // Return array of right length
1439 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1440 for(int i = 0; i < members; i++) {
1441 res->obj_at_put(i, result->obj_at(i));
1442 }
1443 return (jobjectArray)JNIHandles::make_local(env, res);
1444 }
1445
1446 return (jobjectArray)JNIHandles::make_local(env, result());
1447 JVM_END
1448
1449
1450 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1451 {
1452 // ofClass is a reference to a java_lang_Class object.
1453 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1454 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1455 return NULL;
1456 }
1457
1458 bool inner_is_member = false;
1459 Klass* outer_klass
1460 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1461 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1462 if (outer_klass == NULL) return NULL; // already a top-level class
1463 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1464 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1465 }
1466 JVM_END
1467
1468 // should be in InstanceKlass.cpp, but is here for historical reasons
1469 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1470 bool* inner_is_member,
1471 TRAPS) {
1472 Thread* thread = THREAD;
1473 InnerClassesIterator iter(k);
1474 if (iter.length() == 0) {
1475 // No inner class info => no declaring class
1476 return NULL;
1477 }
1478
1479 constantPoolHandle i_cp(thread, k->constants());
1480
1481 bool found = false;
1482 Klass* ok;
1483 instanceKlassHandle outer_klass;
1484 *inner_is_member = false;
1485
1486 // Find inner_klass attribute
1487 for (; !iter.done() && !found; iter.next()) {
1488 int ioff = iter.inner_class_info_index();
1489 int ooff = iter.outer_class_info_index();
1490 int noff = iter.inner_name_index();
1491 if (ioff != 0) {
1492 // Check to see if the name matches the class we're looking for
1493 // before attempting to find the class.
1494 if (i_cp->klass_name_at_matches(k, ioff)) {
1495 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1496 found = (k() == inner_klass);
1497 if (found && ooff != 0) {
1498 ok = i_cp->klass_at(ooff, CHECK_NULL);
1499 outer_klass = instanceKlassHandle(thread, ok);
1500 *inner_is_member = true;
1501 }
1502 }
1503 }
1504 }
1505
1506 if (found && outer_klass.is_null()) {
1507 // It may be anonymous; try for that.
1508 int encl_method_class_idx = k->enclosing_method_class_index();
1509 if (encl_method_class_idx != 0) {
1510 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1511 outer_klass = instanceKlassHandle(thread, ok);
1512 *inner_is_member = false;
1513 }
1514 }
1515
1516 // If no inner class attribute found for this class.
1517 if (outer_klass.is_null()) return NULL;
1518
1519 // Throws an exception if outer klass has not declared k as an inner klass
1520 // We need evidence that each klass knows about the other, or else
1521 // the system could allow a spoof of an inner class to gain access rights.
1522 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1523 return outer_klass();
1524 }
1525
1526 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1527 assert (cls != NULL, "illegal class");
1528 JVMWrapper("JVM_GetClassSignature");
1529 JvmtiVMObjectAllocEventCollector oam;
1530 ResourceMark rm(THREAD);
1531 // Return null for arrays and primatives
1532 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1534 if (k->oop_is_instance()) {
1535 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1536 if (sym == NULL) return NULL;
1537 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1538 return (jstring) JNIHandles::make_local(env, str());
1539 }
1540 }
1541 return NULL;
1542 JVM_END
1543
1544
1545 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1546 assert (cls != NULL, "illegal class");
1547 JVMWrapper("JVM_GetClassAnnotations");
1548
1549 // Return null for arrays and primitives
1550 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1552 if (k->oop_is_instance()) {
1553 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1554 return (jbyteArray) JNIHandles::make_local(env, a);
1555 }
1556 }
1557 return NULL;
1558 JVM_END
1559
1560
1561 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1562 // some of this code was adapted from from jni_FromReflectedField
1563
1564 oop reflected = JNIHandles::resolve_non_null(field);
1565 oop mirror = java_lang_reflect_Field::clazz(reflected);
1566 Klass* k = java_lang_Class::as_Klass(mirror);
1567 int slot = java_lang_reflect_Field::slot(reflected);
1568 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1569
1570 KlassHandle kh(THREAD, k);
1571 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1572
1573 if (modifiers & JVM_ACC_STATIC) {
1574 // for static fields we only look in the current class
1575 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1576 assert(false, "cannot find static field");
1577 return false;
1578 }
1579 } else {
1580 // for instance fields we start with the current class and work
1581 // our way up through the superclass chain
1582 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1583 assert(false, "cannot find instance field");
1584 return false;
1585 }
1586 }
1587 return true;
1588 }
1589
1590 static Method* jvm_get_method_common(jobject method) {
1591 // some of this code was adapted from from jni_FromReflectedMethod
1592
1593 oop reflected = JNIHandles::resolve_non_null(method);
1594 oop mirror = NULL;
1595 int slot = 0;
1596
1597 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1598 mirror = java_lang_reflect_Constructor::clazz(reflected);
1599 slot = java_lang_reflect_Constructor::slot(reflected);
1600 } else {
1601 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1602 "wrong type");
1603 mirror = java_lang_reflect_Method::clazz(reflected);
1604 slot = java_lang_reflect_Method::slot(reflected);
1605 }
1606 Klass* k = java_lang_Class::as_Klass(mirror);
1607
1608 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1609 assert(m != NULL, "cannot find method");
1610 return m; // caller has to deal with NULL in product mode
1611 }
1612
1613 /* Type use annotations support (JDK 1.8) */
1614
1615 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1616 assert (cls != NULL, "illegal class");
1617 JVMWrapper("JVM_GetClassTypeAnnotations");
1618 ResourceMark rm(THREAD);
1619 // Return null for arrays and primitives
1620 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1622 if (k->oop_is_instance()) {
1623 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1624 if (type_annotations != NULL) {
1625 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1626 return (jbyteArray) JNIHandles::make_local(env, a);
1627 }
1628 }
1629 }
1630 return NULL;
1631 JVM_END
1632
1633 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1634 assert (method != NULL, "illegal method");
1635 JVMWrapper("JVM_GetMethodTypeAnnotations");
1636
1637 // method is a handle to a java.lang.reflect.Method object
1638 Method* m = jvm_get_method_common(method);
1639 if (m == NULL) {
1640 return NULL;
1641 }
1642
1643 AnnotationArray* type_annotations = m->type_annotations();
1644 if (type_annotations != NULL) {
1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1646 return (jbyteArray) JNIHandles::make_local(env, a);
1647 }
1648
1649 return NULL;
1650 JVM_END
1651
1652 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1653 assert (field != NULL, "illegal field");
1654 JVMWrapper("JVM_GetFieldTypeAnnotations");
1655
1656 fieldDescriptor fd;
1657 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1658 if (!gotFd) {
1659 return NULL;
1660 }
1661
1662 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1663 JVM_END
1664
1665 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1666 if (!cp->is_within_bounds(index)) {
1667 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1668 }
1669 }
1670
1671 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1672 {
1673 JVMWrapper("JVM_GetMethodParameters");
1674 // method is a handle to a java.lang.reflect.Method object
1675 Method* method_ptr = jvm_get_method_common(method);
1676 methodHandle mh (THREAD, method_ptr);
1677 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1678 const int num_params = mh->method_parameters_length();
1679
1680 if (num_params < 0) {
1681 // A -1 return value from method_parameters_length means there is no
1682 // parameter data. Return null to indicate this to the reflection
1683 // API.
1684 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1685 return (jobjectArray)NULL;
1686 } else {
1687 // Otherwise, we return something up to reflection, even if it is
1688 // a zero-length array. Why? Because in some cases this can
1689 // trigger a MalformedParametersException.
1690
1691 // make sure all the symbols are properly formatted
1692 for (int i = 0; i < num_params; i++) {
1693 MethodParametersElement* params = mh->method_parameters_start();
1694 int index = params[i].name_cp_index;
1695 bounds_check(mh->constants(), index, CHECK_NULL);
1696
1697 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1698 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1699 "Wrong type at constant pool index");
1700 }
1701
1702 }
1703
1704 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1705 objArrayHandle result (THREAD, result_oop);
1706
1707 for (int i = 0; i < num_params; i++) {
1708 MethodParametersElement* params = mh->method_parameters_start();
1709 // For a 0 index, give a NULL symbol
1710 Symbol* sym = 0 != params[i].name_cp_index ?
1711 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1712 int flags = params[i].flags;
1713 oop param = Reflection::new_parameter(reflected_method, i, sym,
1714 flags, CHECK_NULL);
1715 result->obj_at_put(i, param);
1716 }
1717 return (jobjectArray)JNIHandles::make_local(env, result());
1718 }
1719 }
1720 JVM_END
1721
1722 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1723
1724 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1725 {
1726 JVMWrapper("JVM_GetClassDeclaredFields");
1727 JvmtiVMObjectAllocEventCollector oam;
1728
1729 // Exclude primitive types and array types
1730 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1731 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1732 // Return empty array
1733 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1734 return (jobjectArray) JNIHandles::make_local(env, res);
1735 }
1736
1737 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1738 constantPoolHandle cp(THREAD, k->constants());
1739
1740 // Ensure class is linked
1741 k->link_class(CHECK_NULL);
1742
1743 // 4496456 We need to filter out java.lang.Throwable.backtrace
1744 bool skip_backtrace = false;
1745
1746 // Allocate result
1747 int num_fields;
1748
1749 if (publicOnly) {
1750 num_fields = 0;
1751 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1752 if (fs.access_flags().is_public()) ++num_fields;
1753 }
1754 } else {
1755 num_fields = k->java_fields_count();
1756
1757 if (k() == SystemDictionary::Throwable_klass()) {
1758 num_fields--;
1759 skip_backtrace = true;
1760 }
1761 }
1762
1763 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1764 objArrayHandle result (THREAD, r);
1765
1766 int out_idx = 0;
1767 fieldDescriptor fd;
1768 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1769 if (skip_backtrace) {
1770 // 4496456 skip java.lang.Throwable.backtrace
1771 int offset = fs.offset();
1772 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1773 }
1774
1775 if (!publicOnly || fs.access_flags().is_public()) {
1776 fd.reinitialize(k(), fs.index());
1777 oop field = Reflection::new_field(&fd, CHECK_NULL);
1778 result->obj_at_put(out_idx, field);
1779 ++out_idx;
1780 }
1781 }
1782 assert(out_idx == num_fields, "just checking");
1783 return (jobjectArray) JNIHandles::make_local(env, result());
1784 }
1785 JVM_END
1786
1787 static bool select_method(methodHandle method, bool want_constructor) {
1788 if (want_constructor) {
1789 return (method->is_initializer() && !method->is_static());
1790 } else {
1791 return (!method->is_initializer() && !method->is_overpass());
1792 }
1793 }
1794
1795 static jobjectArray get_class_declared_methods_helper(
1796 JNIEnv *env,
1797 jclass ofClass, jboolean publicOnly,
1798 bool want_constructor,
1799 Klass* klass, TRAPS) {
1800
1801 JvmtiVMObjectAllocEventCollector oam;
1802
1803 // Exclude primitive types and array types
1804 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1805 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1806 // Return empty array
1807 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1808 return (jobjectArray) JNIHandles::make_local(env, res);
1809 }
1810
1811 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1812
1813 // Ensure class is linked
1814 k->link_class(CHECK_NULL);
1815
1816 Array<Method*>* methods = k->methods();
1817 int methods_length = methods->length();
1818
1819 // Save original method_idnum in case of redefinition, which can change
1820 // the idnum of obsolete methods. The new method will have the same idnum
1821 // but if we refresh the methods array, the counts will be wrong.
1822 ResourceMark rm(THREAD);
1823 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1824 int num_methods = 0;
1825
1826 for (int i = 0; i < methods_length; i++) {
1827 methodHandle method(THREAD, methods->at(i));
1828 if (select_method(method, want_constructor)) {
1829 if (!publicOnly || method->is_public()) {
1830 idnums->push(method->method_idnum());
1831 ++num_methods;
1832 }
1833 }
1834 }
1835
1836 // Allocate result
1837 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1838 objArrayHandle result (THREAD, r);
1839
1840 // Now just put the methods that we selected above, but go by their idnum
1841 // in case of redefinition. The methods can be redefined at any safepoint,
1842 // so above when allocating the oop array and below when creating reflect
1843 // objects.
1844 for (int i = 0; i < num_methods; i++) {
1845 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1846 if (method.is_null()) {
1847 // Method may have been deleted and seems this API can handle null
1848 // Otherwise should probably put a method that throws NSME
1849 result->obj_at_put(i, NULL);
1850 } else {
1851 oop m;
1852 if (want_constructor) {
1853 m = Reflection::new_constructor(method, CHECK_NULL);
1854 } else {
1855 m = Reflection::new_method(method, false, CHECK_NULL);
1856 }
1857 result->obj_at_put(i, m);
1858 }
1859 }
1860
1861 return (jobjectArray) JNIHandles::make_local(env, result());
1862 }
1863
1864 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1865 {
1866 JVMWrapper("JVM_GetClassDeclaredMethods");
1867 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1868 /*want_constructor*/ false,
1869 SystemDictionary::reflect_Method_klass(), THREAD);
1870 }
1871 JVM_END
1872
1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1874 {
1875 JVMWrapper("JVM_GetClassDeclaredConstructors");
1876 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1877 /*want_constructor*/ true,
1878 SystemDictionary::reflect_Constructor_klass(), THREAD);
1879 }
1880 JVM_END
1881
1882 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1883 {
1884 JVMWrapper("JVM_GetClassAccessFlags");
1885 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1886 // Primitive type
1887 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1888 }
1889
1890 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1891 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1892 }
1893 JVM_END
1894
1895
1896 // Constant pool access //////////////////////////////////////////////////////////
1897
1898 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1899 {
1900 JVMWrapper("JVM_GetClassConstantPool");
1901 JvmtiVMObjectAllocEventCollector oam;
1902
1903 // Return null for primitives and arrays
1904 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1905 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1906 if (k->oop_is_instance()) {
1907 instanceKlassHandle k_h(THREAD, k);
1908 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1909 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1910 return JNIHandles::make_local(jcp());
1911 }
1912 }
1913 return NULL;
1914 }
1915 JVM_END
1916
1917
1918 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1919 {
1920 JVMWrapper("JVM_ConstantPoolGetSize");
1921 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1922 return cp->length();
1923 }
1924 JVM_END
1925
1926
1927 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1928 {
1929 JVMWrapper("JVM_ConstantPoolGetClassAt");
1930 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1931 bounds_check(cp, index, CHECK_NULL);
1932 constantTag tag = cp->tag_at(index);
1933 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1934 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1935 }
1936 Klass* k = cp->klass_at(index, CHECK_NULL);
1937 return (jclass) JNIHandles::make_local(k->java_mirror());
1938 }
1939 JVM_END
1940
1941 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1942 {
1943 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1944 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1945 bounds_check(cp, index, CHECK_NULL);
1946 constantTag tag = cp->tag_at(index);
1947 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1948 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1949 }
1950 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1951 if (k == NULL) return NULL;
1952 return (jclass) JNIHandles::make_local(k->java_mirror());
1953 }
1954 JVM_END
1955
1956 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1957 constantTag tag = cp->tag_at(index);
1958 if (!tag.is_method() && !tag.is_interface_method()) {
1959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1960 }
1961 int klass_ref = cp->uncached_klass_ref_index_at(index);
1962 Klass* k_o;
1963 if (force_resolution) {
1964 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1965 } else {
1966 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1967 if (k_o == NULL) return NULL;
1968 }
1969 instanceKlassHandle k(THREAD, k_o);
1970 Symbol* name = cp->uncached_name_ref_at(index);
1971 Symbol* sig = cp->uncached_signature_ref_at(index);
1972 methodHandle m (THREAD, k->find_method(name, sig));
1973 if (m.is_null()) {
1974 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1975 }
1976 oop method;
1977 if (!m->is_initializer() || m->is_static()) {
1978 method = Reflection::new_method(m, true, CHECK_NULL);
1979 } else {
1980 method = Reflection::new_constructor(m, CHECK_NULL);
1981 }
1982 return JNIHandles::make_local(method);
1983 }
1984
1985 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1986 {
1987 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1988 JvmtiVMObjectAllocEventCollector oam;
1989 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1990 bounds_check(cp, index, CHECK_NULL);
1991 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1992 return res;
1993 }
1994 JVM_END
1995
1996 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1997 {
1998 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1999 JvmtiVMObjectAllocEventCollector oam;
2000 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2001 bounds_check(cp, index, CHECK_NULL);
2002 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2003 return res;
2004 }
2005 JVM_END
2006
2007 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2008 constantTag tag = cp->tag_at(index);
2009 if (!tag.is_field()) {
2010 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2011 }
2012 int klass_ref = cp->uncached_klass_ref_index_at(index);
2013 Klass* k_o;
2014 if (force_resolution) {
2015 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2016 } else {
2017 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2018 if (k_o == NULL) return NULL;
2019 }
2020 instanceKlassHandle k(THREAD, k_o);
2021 Symbol* name = cp->uncached_name_ref_at(index);
2022 Symbol* sig = cp->uncached_signature_ref_at(index);
2023 fieldDescriptor fd;
2024 Klass* target_klass = k->find_field(name, sig, &fd);
2025 if (target_klass == NULL) {
2026 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2027 }
2028 oop field = Reflection::new_field(&fd, CHECK_NULL);
2029 return JNIHandles::make_local(field);
2030 }
2031
2032 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2033 {
2034 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2035 JvmtiVMObjectAllocEventCollector oam;
2036 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2037 bounds_check(cp, index, CHECK_NULL);
2038 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2039 return res;
2040 }
2041 JVM_END
2042
2043 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2044 {
2045 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2046 JvmtiVMObjectAllocEventCollector oam;
2047 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2048 bounds_check(cp, index, CHECK_NULL);
2049 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2050 return res;
2051 }
2052 JVM_END
2053
2054 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2055 {
2056 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2057 JvmtiVMObjectAllocEventCollector oam;
2058 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2059 bounds_check(cp, index, CHECK_NULL);
2060 constantTag tag = cp->tag_at(index);
2061 if (!tag.is_field_or_method()) {
2062 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2063 }
2064 int klass_ref = cp->uncached_klass_ref_index_at(index);
2065 Symbol* klass_name = cp->klass_name_at(klass_ref);
2066 Symbol* member_name = cp->uncached_name_ref_at(index);
2067 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2068 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2069 objArrayHandle dest(THREAD, dest_o);
2070 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2071 dest->obj_at_put(0, str());
2072 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2073 dest->obj_at_put(1, str());
2074 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2075 dest->obj_at_put(2, str());
2076 return (jobjectArray) JNIHandles::make_local(dest());
2077 }
2078 JVM_END
2079
2080 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2081 {
2082 JVMWrapper("JVM_ConstantPoolGetIntAt");
2083 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2084 bounds_check(cp, index, CHECK_0);
2085 constantTag tag = cp->tag_at(index);
2086 if (!tag.is_int()) {
2087 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2088 }
2089 return cp->int_at(index);
2090 }
2091 JVM_END
2092
2093 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2094 {
2095 JVMWrapper("JVM_ConstantPoolGetLongAt");
2096 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2097 bounds_check(cp, index, CHECK_(0L));
2098 constantTag tag = cp->tag_at(index);
2099 if (!tag.is_long()) {
2100 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2101 }
2102 return cp->long_at(index);
2103 }
2104 JVM_END
2105
2106 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2107 {
2108 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2109 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_(0.0f));
2111 constantTag tag = cp->tag_at(index);
2112 if (!tag.is_float()) {
2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2114 }
2115 return cp->float_at(index);
2116 }
2117 JVM_END
2118
2119 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2120 {
2121 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2122 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2123 bounds_check(cp, index, CHECK_(0.0));
2124 constantTag tag = cp->tag_at(index);
2125 if (!tag.is_double()) {
2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127 }
2128 return cp->double_at(index);
2129 }
2130 JVM_END
2131
2132 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2133 {
2134 JVMWrapper("JVM_ConstantPoolGetStringAt");
2135 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 bounds_check(cp, index, CHECK_NULL);
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_string()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 oop str = cp->string_at(index, CHECK_NULL);
2142 return (jstring) JNIHandles::make_local(str);
2143 }
2144 JVM_END
2145
2146 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2147 {
2148 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2149 JvmtiVMObjectAllocEventCollector oam;
2150 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2151 bounds_check(cp, index, CHECK_NULL);
2152 constantTag tag = cp->tag_at(index);
2153 if (!tag.is_symbol()) {
2154 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2155 }
2156 Symbol* sym = cp->symbol_at(index);
2157 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2158 return (jstring) JNIHandles::make_local(str());
2159 }
2160 JVM_END
2161
2162
2163 // Assertion support. //////////////////////////////////////////////////////////
2164
2165 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2166 JVMWrapper("JVM_DesiredAssertionStatus");
2167 assert(cls != NULL, "bad class");
2168
2169 oop r = JNIHandles::resolve(cls);
2170 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2171 if (java_lang_Class::is_primitive(r)) return false;
2172
2173 Klass* k = java_lang_Class::as_Klass(r);
2174 assert(k->oop_is_instance(), "must be an instance klass");
2175 if (! k->oop_is_instance()) return false;
2176
2177 ResourceMark rm(THREAD);
2178 const char* name = k->name()->as_C_string();
2179 bool system_class = k->class_loader() == NULL;
2180 return JavaAssertions::enabled(name, system_class);
2181
2182 JVM_END
2183
2184
2185 // Return a new AssertionStatusDirectives object with the fields filled in with
2186 // command-line assertion arguments (i.e., -ea, -da).
2187 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2188 JVMWrapper("JVM_AssertionStatusDirectives");
2189 JvmtiVMObjectAllocEventCollector oam;
2190 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2191 return JNIHandles::make_local(env, asd);
2192 JVM_END
2193
2194 // Verification ////////////////////////////////////////////////////////////////////////////////
2195
2196 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2197
2198 // RedefineClasses support: bug 6214132 caused verification to fail.
2199 // All functions from this section should call the jvmtiThreadSate function:
2200 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2201 // The function returns a Klass* of the _scratch_class if the verifier
2202 // was invoked in the middle of the class redefinition.
2203 // Otherwise it returns its argument value which is the _the_class Klass*.
2204 // Please, refer to the description in the jvmtiThreadSate.hpp.
2205
2206 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2207 JVMWrapper("JVM_GetClassNameUTF");
2208 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2209 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2210 return k->name()->as_utf8();
2211 JVM_END
2212
2213
2214 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2215 JVMWrapper("JVM_GetClassCPTypes");
2216 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2217 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2218 // types will have length zero if this is not an InstanceKlass
2219 // (length is determined by call to JVM_GetClassCPEntriesCount)
2220 if (k->oop_is_instance()) {
2221 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2222 for (int index = cp->length() - 1; index >= 0; index--) {
2223 constantTag tag = cp->tag_at(index);
2224 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2225 }
2226 }
2227 JVM_END
2228
2229
2230 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2231 JVMWrapper("JVM_GetClassCPEntriesCount");
2232 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2233 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2234 if (!k->oop_is_instance())
2235 return 0;
2236 return InstanceKlass::cast(k)->constants()->length();
2237 JVM_END
2238
2239
2240 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2241 JVMWrapper("JVM_GetClassFieldsCount");
2242 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2243 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2244 if (!k->oop_is_instance())
2245 return 0;
2246 return InstanceKlass::cast(k)->java_fields_count();
2247 JVM_END
2248
2249
2250 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2251 JVMWrapper("JVM_GetClassMethodsCount");
2252 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2253 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2254 if (!k->oop_is_instance())
2255 return 0;
2256 return InstanceKlass::cast(k)->methods()->length();
2257 JVM_END
2258
2259
2260 // The following methods, used for the verifier, are never called with
2261 // array klasses, so a direct cast to InstanceKlass is safe.
2262 // Typically, these methods are called in a loop with bounds determined
2263 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2264 // zero for arrays.
2265 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2266 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2267 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2268 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2269 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2270 int length = method->checked_exceptions_length();
2271 if (length > 0) {
2272 CheckedExceptionElement* table= method->checked_exceptions_start();
2273 for (int i = 0; i < length; i++) {
2274 exceptions[i] = table[i].class_cp_index;
2275 }
2276 }
2277 JVM_END
2278
2279
2280 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2281 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2282 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2283 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2284 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2285 return method->checked_exceptions_length();
2286 JVM_END
2287
2288
2289 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2290 JVMWrapper("JVM_GetMethodIxByteCode");
2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2293 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2294 memcpy(code, method->code_base(), method->code_size());
2295 JVM_END
2296
2297
2298 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2299 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2300 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2301 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2302 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2303 return method->code_size();
2304 JVM_END
2305
2306
2307 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2308 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2309 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2310 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2311 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2312 ExceptionTable extable(method);
2313 entry->start_pc = extable.start_pc(entry_index);
2314 entry->end_pc = extable.end_pc(entry_index);
2315 entry->handler_pc = extable.handler_pc(entry_index);
2316 entry->catchType = extable.catch_type_index(entry_index);
2317 JVM_END
2318
2319
2320 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2321 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2325 return method->exception_table_length();
2326 JVM_END
2327
2328
2329 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2330 JVMWrapper("JVM_GetMethodIxModifiers");
2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2333 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2334 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2335 JVM_END
2336
2337
2338 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2339 JVMWrapper("JVM_GetFieldIxModifiers");
2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2342 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2343 JVM_END
2344
2345
2346 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2347 JVMWrapper("JVM_GetMethodIxLocalsCount");
2348 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2349 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2350 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2351 return method->max_locals();
2352 JVM_END
2353
2354
2355 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2356 JVMWrapper("JVM_GetMethodIxArgsSize");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2360 return method->size_of_parameters();
2361 JVM_END
2362
2363
2364 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2365 JVMWrapper("JVM_GetMethodIxMaxStack");
2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2369 return method->verifier_max_stack();
2370 JVM_END
2371
2372
2373 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2374 JVMWrapper("JVM_IsConstructorIx");
2375 ResourceMark rm(THREAD);
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 return method->name()->equals(vmSymbols::object_initializer_name());
2380 JVM_END
2381
2382
2383 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2384 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2385 ResourceMark rm(THREAD);
2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2389 return method->is_overpass();
2390 JVM_END
2391
2392 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2393 JVMWrapper("JVM_GetMethodIxIxUTF");
2394 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2395 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2396 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2397 return method->name()->as_utf8();
2398 JVM_END
2399
2400
2401 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2402 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2405 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2406 return method->signature()->as_utf8();
2407 JVM_END
2408
2409 /**
2410 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2411 * read entries in the constant pool. Since the old verifier always
2412 * works on a copy of the code, it will not see any rewriting that
2413 * may possibly occur in the middle of verification. So it is important
2414 * that nothing it calls tries to use the cpCache instead of the raw
2415 * constant pool, so we must use cp->uncached_x methods when appropriate.
2416 */
2417 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2418 JVMWrapper("JVM_GetCPFieldNameUTF");
2419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2420 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2421 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2422 switch (cp->tag_at(cp_index).value()) {
2423 case JVM_CONSTANT_Fieldref:
2424 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2425 default:
2426 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2427 }
2428 ShouldNotReachHere();
2429 return NULL;
2430 JVM_END
2431
2432
2433 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2434 JVMWrapper("JVM_GetCPMethodNameUTF");
2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2437 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2438 switch (cp->tag_at(cp_index).value()) {
2439 case JVM_CONSTANT_InterfaceMethodref:
2440 case JVM_CONSTANT_Methodref:
2441 case JVM_CONSTANT_NameAndType: // for invokedynamic
2442 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2443 default:
2444 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2445 }
2446 ShouldNotReachHere();
2447 return NULL;
2448 JVM_END
2449
2450
2451 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2452 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2456 switch (cp->tag_at(cp_index).value()) {
2457 case JVM_CONSTANT_InterfaceMethodref:
2458 case JVM_CONSTANT_Methodref:
2459 case JVM_CONSTANT_NameAndType: // for invokedynamic
2460 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2461 default:
2462 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2463 }
2464 ShouldNotReachHere();
2465 return NULL;
2466 JVM_END
2467
2468
2469 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2470 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2473 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2474 switch (cp->tag_at(cp_index).value()) {
2475 case JVM_CONSTANT_Fieldref:
2476 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2477 default:
2478 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2479 }
2480 ShouldNotReachHere();
2481 return NULL;
2482 JVM_END
2483
2484
2485 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2486 JVMWrapper("JVM_GetCPClassNameUTF");
2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2490 Symbol* classname = cp->klass_name_at(cp_index);
2491 return classname->as_utf8();
2492 JVM_END
2493
2494
2495 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2496 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2497 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2498 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2499 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2500 switch (cp->tag_at(cp_index).value()) {
2501 case JVM_CONSTANT_Fieldref: {
2502 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2503 Symbol* classname = cp->klass_name_at(class_index);
2504 return classname->as_utf8();
2505 }
2506 default:
2507 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2508 }
2509 ShouldNotReachHere();
2510 return NULL;
2511 JVM_END
2512
2513
2514 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2515 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2517 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2518 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2519 switch (cp->tag_at(cp_index).value()) {
2520 case JVM_CONSTANT_Methodref:
2521 case JVM_CONSTANT_InterfaceMethodref: {
2522 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2523 Symbol* classname = cp->klass_name_at(class_index);
2524 return classname->as_utf8();
2525 }
2526 default:
2527 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2528 }
2529 ShouldNotReachHere();
2530 return NULL;
2531 JVM_END
2532
2533
2534 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2535 JVMWrapper("JVM_GetCPFieldModifiers");
2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2537 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2539 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2540 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2541 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2542 switch (cp->tag_at(cp_index).value()) {
2543 case JVM_CONSTANT_Fieldref: {
2544 Symbol* name = cp->uncached_name_ref_at(cp_index);
2545 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2546 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2547 if (fs.name()->equals(name) && fs.signature()->equals(signature)) {
2548 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2549 }
2550 }
2551 return -1;
2552 }
2553 default:
2554 fatal("JVM_GetCPFieldModifiers: illegal constant");
2555 }
2556 ShouldNotReachHere();
2557 return 0;
2558 JVM_END
2559
2560
2561 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2562 JVMWrapper("JVM_GetCPMethodModifiers");
2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2564 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2567 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2568 switch (cp->tag_at(cp_index).value()) {
2569 case JVM_CONSTANT_Methodref:
2570 case JVM_CONSTANT_InterfaceMethodref: {
2571 Symbol* name = cp->uncached_name_ref_at(cp_index);
2572 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2573 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2574 int methods_count = methods->length();
2575 for (int i = 0; i < methods_count; i++) {
2576 Method* method = methods->at(i);
2577 if (method->name()->equals(name) && method->signature()->equals(signature)) {
2578 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2579 }
2580 }
2581 return -1;
2582 }
2583 default:
2584 fatal("JVM_GetCPMethodModifiers: illegal constant");
2585 }
2586 ShouldNotReachHere();
2587 return 0;
2588 JVM_END
2589
2590
2591 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2592
2593 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2594 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2595 JVM_END
2596
2597
2598 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2599 JVMWrapper("JVM_IsSameClassPackage");
2600 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2601 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2602 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2603 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2604 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2605 JVM_END
2606
2607 // Printing support //////////////////////////////////////////////////
2608 extern "C" {
2609
2610 ATTRIBUTE_PRINTF(3, 0)
2611 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2612 // see bug 4399518, 4417214
2613 if ((intptr_t)count <= 0) return -1;
2614
2615 int result = vsnprintf(str, count, fmt, args);
2616 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2617 // characters which would have been written had the buffer been large
2618 // enough; on Windows, it returns -1. We handle both cases here and
2619 // always return -1, and perform null termination.
2620 if ((result > 0 && (size_t)result >= count) || result == -1) {
2621 str[count - 1] = '\0';
2622 result = -1;
2623 }
2624
2625 return result;
2626 }
2627
2628 ATTRIBUTE_PRINTF(3, 0)
2629 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2630 va_list args;
2631 int len;
2632 va_start(args, fmt);
2633 len = jio_vsnprintf(str, count, fmt, args);
2634 va_end(args);
2635 return len;
2636 }
2637
2638 ATTRIBUTE_PRINTF(2,3)
2639 int jio_fprintf(FILE* f, const char *fmt, ...) {
2640 int len;
2641 va_list args;
2642 va_start(args, fmt);
2643 len = jio_vfprintf(f, fmt, args);
2644 va_end(args);
2645 return len;
2646 }
2647
2648 ATTRIBUTE_PRINTF(2, 0)
2649 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2650 if (Arguments::vfprintf_hook() != NULL) {
2651 return Arguments::vfprintf_hook()(f, fmt, args);
2652 } else {
2653 return vfprintf(f, fmt, args);
2654 }
2655 }
2656
2657 ATTRIBUTE_PRINTF(1, 2)
2658 JNIEXPORT int jio_printf(const char *fmt, ...) {
2659 int len;
2660 va_list args;
2661 va_start(args, fmt);
2662 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2663 va_end(args);
2664 return len;
2665 }
2666
2667
2668 // HotSpot specific jio method
2669 void jio_print(const char* s) {
2670 // Try to make this function as atomic as possible.
2671 if (Arguments::vfprintf_hook() != NULL) {
2672 jio_fprintf(defaultStream::output_stream(), "%s", s);
2673 } else {
2674 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2675 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2676 }
2677 }
2678
2679 } // Extern C
2680
2681 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2682
2683 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2684 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2685 // OSThread objects. The exception to this rule is when the target object is the thread
2686 // doing the operation, in which case we know that the thread won't exit until the
2687 // operation is done (all exits being voluntary). There are a few cases where it is
2688 // rather silly to do operations on yourself, like resuming yourself or asking whether
2689 // you are alive. While these can still happen, they are not subject to deadlocks if
2690 // the lock is held while the operation occurs (this is not the case for suspend, for
2691 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2692 // implementation is local to this file, we always lock Threads_lock for that one.
2693
2694 static void thread_entry(JavaThread* thread, TRAPS) {
2695 HandleMark hm(THREAD);
2696 Handle obj(THREAD, thread->threadObj());
2697 JavaValue result(T_VOID);
2698 JavaCalls::call_virtual(&result,
2699 obj,
2700 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2701 vmSymbols::run_method_name(),
2702 vmSymbols::void_method_signature(),
2703 THREAD);
2704 }
2705
2706
2707 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2708 JVMWrapper("JVM_StartThread");
2709 JavaThread *native_thread = NULL;
2710
2711 // We cannot hold the Threads_lock when we throw an exception,
2712 // due to rank ordering issues. Example: we might need to grab the
2713 // Heap_lock while we construct the exception.
2714 bool throw_illegal_thread_state = false;
2715
2716 // We must release the Threads_lock before we can post a jvmti event
2717 // in Thread::start.
2718 {
2719 // Ensure that the C++ Thread and OSThread structures aren't freed before
2720 // we operate.
2721 MutexLocker mu(Threads_lock);
2722
2723 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2724 // re-starting an already started thread, so we should usually find
2725 // that the JavaThread is null. However for a JNI attached thread
2726 // there is a small window between the Thread object being created
2727 // (with its JavaThread set) and the update to its threadStatus, so we
2728 // have to check for this
2729 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2730 throw_illegal_thread_state = true;
2731 } else {
2732 // We could also check the stillborn flag to see if this thread was already stopped, but
2733 // for historical reasons we let the thread detect that itself when it starts running
2734
2735 jlong size =
2736 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2737 // Allocate the C++ Thread structure and create the native thread. The
2738 // stack size retrieved from java is signed, but the constructor takes
2739 // size_t (an unsigned type), so avoid passing negative values which would
2740 // result in really large stacks.
2741 size_t sz = size > 0 ? (size_t) size : 0;
2742 native_thread = new JavaThread(&thread_entry, sz);
2743
2744 // At this point it may be possible that no osthread was created for the
2745 // JavaThread due to lack of memory. Check for this situation and throw
2746 // an exception if necessary. Eventually we may want to change this so
2747 // that we only grab the lock if the thread was created successfully -
2748 // then we can also do this check and throw the exception in the
2749 // JavaThread constructor.
2750 if (native_thread->osthread() != NULL) {
2751 // Note: the current thread is not being used within "prepare".
2752 native_thread->prepare(jthread);
2753 }
2754 }
2755 }
2756
2757 if (throw_illegal_thread_state) {
2758 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2759 }
2760
2761 assert(native_thread != NULL, "Starting null thread?");
2762
2763 if (native_thread->osthread() == NULL) {
2764 // No one should hold a reference to the 'native_thread'.
2765 delete native_thread;
2766 if (JvmtiExport::should_post_resource_exhausted()) {
2767 JvmtiExport::post_resource_exhausted(
2768 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2769 os::native_thread_creation_failed_msg());
2770 }
2771 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2772 os::native_thread_creation_failed_msg());
2773 }
2774
2775 Thread::start(native_thread);
2776
2777 JVM_END
2778
2779 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2780 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2781 // but is thought to be reliable and simple. In the case, where the receiver is the
2782 // same thread as the sender, no safepoint is needed.
2783 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2784 JVMWrapper("JVM_StopThread");
2785
2786 oop java_throwable = JNIHandles::resolve(throwable);
2787 if (java_throwable == NULL) {
2788 THROW(vmSymbols::java_lang_NullPointerException());
2789 }
2790 oop java_thread = JNIHandles::resolve_non_null(jthread);
2791 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2792 Events::log_exception(JavaThread::current(),
2793 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2794 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2795 // First check if thread is alive
2796 if (receiver != NULL) {
2797 // Check if exception is getting thrown at self (use oop equality, since the
2798 // target object might exit)
2799 if (java_thread == thread->threadObj()) {
2800 THROW_OOP(java_throwable);
2801 } else {
2802 // Enques a VM_Operation to stop all threads and then deliver the exception...
2803 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2804 }
2805 }
2806 else {
2807 // Either:
2808 // - target thread has not been started before being stopped, or
2809 // - target thread already terminated
2810 // We could read the threadStatus to determine which case it is
2811 // but that is overkill as it doesn't matter. We must set the
2812 // stillborn flag for the first case, and if the thread has already
2813 // exited setting this flag has no affect
2814 java_lang_Thread::set_stillborn(java_thread);
2815 }
2816 JVM_END
2817
2818
2819 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2820 JVMWrapper("JVM_IsThreadAlive");
2821
2822 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2823 return java_lang_Thread::is_alive(thread_oop);
2824 JVM_END
2825
2826
2827 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2828 JVMWrapper("JVM_SuspendThread");
2829 oop java_thread = JNIHandles::resolve_non_null(jthread);
2830 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2831
2832 if (receiver != NULL) {
2833 // thread has run and has not exited (still on threads list)
2834
2835 {
2836 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2837 if (receiver->is_external_suspend()) {
2838 // Don't allow nested external suspend requests. We can't return
2839 // an error from this interface so just ignore the problem.
2840 return;
2841 }
2842 if (receiver->is_exiting()) { // thread is in the process of exiting
2843 return;
2844 }
2845 receiver->set_external_suspend();
2846 }
2847
2848 // java_suspend() will catch threads in the process of exiting
2849 // and will ignore them.
2850 receiver->java_suspend();
2851
2852 // It would be nice to have the following assertion in all the
2853 // time, but it is possible for a racing resume request to have
2854 // resumed this thread right after we suspended it. Temporarily
2855 // enable this assertion if you are chasing a different kind of
2856 // bug.
2857 //
2858 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2859 // receiver->is_being_ext_suspended(), "thread is not suspended");
2860 }
2861 JVM_END
2862
2863
2864 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2865 JVMWrapper("JVM_ResumeThread");
2866 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2867 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2868 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2869 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2870 // looks at it.
2871 MutexLocker ml(Threads_lock);
2872 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2873 if (thr != NULL) {
2874 // the thread has run and is not in the process of exiting
2875 thr->java_resume();
2876 }
2877 JVM_END
2878
2879
2880 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2881 JVMWrapper("JVM_SetThreadPriority");
2882 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2883 MutexLocker ml(Threads_lock);
2884 oop java_thread = JNIHandles::resolve_non_null(jthread);
2885 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2886 JavaThread* thr = java_lang_Thread::thread(java_thread);
2887 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2888 Thread::set_priority(thr, (ThreadPriority)prio);
2889 }
2890 JVM_END
2891
2892
2893 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2894 JVMWrapper("JVM_Yield");
2895 if (os::dont_yield()) return;
2896 HOTSPOT_THREAD_YIELD();
2897
2898 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2899 // Critical for similar threading behaviour
2900 if (ConvertYieldToSleep) {
2901 os::sleep(thread, MinSleepInterval, false);
2902 } else {
2903 os::naked_yield();
2904 }
2905 JVM_END
2906
2907
2908 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2909 JVMWrapper("JVM_Sleep");
2910
2911 if (millis < 0) {
2912 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2913 }
2914
2915 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2916 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2917 }
2918
2919 // Save current thread state and restore it at the end of this block.
2920 // And set new thread state to SLEEPING.
2921 JavaThreadSleepState jtss(thread);
2922
2923 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2924
2925 EventThreadSleep event;
2926
2927 if (millis == 0) {
2928 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2929 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2930 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2931 // for SOLARIS
2932 if (ConvertSleepToYield) {
2933 os::naked_yield();
2934 } else {
2935 ThreadState old_state = thread->osthread()->get_state();
2936 thread->osthread()->set_state(SLEEPING);
2937 os::sleep(thread, MinSleepInterval, false);
2938 thread->osthread()->set_state(old_state);
2939 }
2940 } else {
2941 ThreadState old_state = thread->osthread()->get_state();
2942 thread->osthread()->set_state(SLEEPING);
2943 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2944 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2945 // us while we were sleeping. We do not overwrite those.
2946 if (!HAS_PENDING_EXCEPTION) {
2947 if (event.should_commit()) {
2948 event.set_time(millis);
2949 event.commit();
2950 }
2951 HOTSPOT_THREAD_SLEEP_END(1);
2952
2953 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2954 // to properly restore the thread state. That's likely wrong.
2955 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2956 }
2957 }
2958 thread->osthread()->set_state(old_state);
2959 }
2960 if (event.should_commit()) {
2961 event.set_time(millis);
2962 event.commit();
2963 }
2964 HOTSPOT_THREAD_SLEEP_END(0);
2965 JVM_END
2966
2967 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2968 JVMWrapper("JVM_CurrentThread");
2969 oop jthread = thread->threadObj();
2970 assert (thread != NULL, "no current thread!");
2971 return JNIHandles::make_local(env, jthread);
2972 JVM_END
2973
2974
2975 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2976 JVMWrapper("JVM_CountStackFrames");
2977
2978 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2979 oop java_thread = JNIHandles::resolve_non_null(jthread);
2980 bool throw_illegal_thread_state = false;
2981 int count = 0;
2982
2983 {
2984 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2985 // We need to re-resolve the java_thread, since a GC might have happened during the
2986 // acquire of the lock
2987 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2988
2989 if (thr == NULL) {
2990 // do nothing
2991 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2992 // Check whether this java thread has been suspended already. If not, throws
2993 // IllegalThreadStateException. We defer to throw that exception until
2994 // Threads_lock is released since loading exception class has to leave VM.
2995 // The correct way to test a thread is actually suspended is
2996 // wait_for_ext_suspend_completion(), but we can't call that while holding
2997 // the Threads_lock. The above tests are sufficient for our purposes
2998 // provided the walkability of the stack is stable - which it isn't
2999 // 100% but close enough for most practical purposes.
3000 throw_illegal_thread_state = true;
3001 } else {
3002 // Count all java activation, i.e., number of vframes
3003 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3004 // Native frames are not counted
3005 if (!vfst.method()->is_native()) count++;
3006 }
3007 }
3008 }
3009
3010 if (throw_illegal_thread_state) {
3011 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3012 "this thread is not suspended");
3013 }
3014 return count;
3015 JVM_END
3016
3017 // Consider: A better way to implement JVM_Interrupt() is to acquire
3018 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3019 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3020 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3021 // outside the critical section. Threads_lock is hot so we want to minimize
3022 // the hold-time. A cleaner interface would be to decompose interrupt into
3023 // two steps. The 1st phase, performed under Threads_lock, would return
3024 // a closure that'd be invoked after Threads_lock was dropped.
3025 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3026 // admit spurious wakeups.
3027
3028 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3029 JVMWrapper("JVM_Interrupt");
3030
3031 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3032 oop java_thread = JNIHandles::resolve_non_null(jthread);
3033 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3034 // We need to re-resolve the java_thread, since a GC might have happened during the
3035 // acquire of the lock
3036 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3037 if (thr != NULL) {
3038 Thread::interrupt(thr);
3039 }
3040 JVM_END
3041
3042
3043 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3044 JVMWrapper("JVM_IsInterrupted");
3045
3046 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3047 oop java_thread = JNIHandles::resolve_non_null(jthread);
3048 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3049 // We need to re-resolve the java_thread, since a GC might have happened during the
3050 // acquire of the lock
3051 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3052 if (thr == NULL) {
3053 return JNI_FALSE;
3054 } else {
3055 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3056 }
3057 JVM_END
3058
3059
3060 // Return true iff the current thread has locked the object passed in
3061
3062 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3063 JVMWrapper("JVM_HoldsLock");
3064 assert(THREAD->is_Java_thread(), "sanity check");
3065 if (obj == NULL) {
3066 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3067 }
3068 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3069 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3070 JVM_END
3071
3072
3073 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3074 JVMWrapper("JVM_DumpAllStacks");
3075 VM_PrintThreads op;
3076 VMThread::execute(&op);
3077 if (JvmtiExport::should_post_data_dump()) {
3078 JvmtiExport::post_data_dump();
3079 }
3080 JVM_END
3081
3082 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3083 JVMWrapper("JVM_SetNativeThreadName");
3084 ResourceMark rm(THREAD);
3085 oop java_thread = JNIHandles::resolve_non_null(jthread);
3086 JavaThread* thr = java_lang_Thread::thread(java_thread);
3087 // Thread naming only supported for the current thread, doesn't work for
3088 // target threads.
3089 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3090 // we don't set the name of an attached thread to avoid stepping
3091 // on other programs
3092 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3093 os::set_native_thread_name(thread_name);
3094 }
3095 JVM_END
3096
3097 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3098
3099 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3100 assert(jthread->is_Java_thread(), "must be a Java thread");
3101 if (jthread->privileged_stack_top() == NULL) return false;
3102 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3103 oop loader = jthread->privileged_stack_top()->class_loader();
3104 if (loader == NULL) return true;
3105 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3106 if (trusted) return true;
3107 }
3108 return false;
3109 }
3110
3111 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3112 JVMWrapper("JVM_CurrentLoadedClass");
3113 ResourceMark rm(THREAD);
3114
3115 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3116 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3117 bool trusted = is_trusted_frame(thread, &vfst);
3118 if (trusted) return NULL;
3119
3120 Method* m = vfst.method();
3121 if (!m->is_native()) {
3122 InstanceKlass* holder = m->method_holder();
3123 oop loader = holder->class_loader();
3124 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3125 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3126 }
3127 }
3128 }
3129 return NULL;
3130 JVM_END
3131
3132
3133 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3134 JVMWrapper("JVM_CurrentClassLoader");
3135 ResourceMark rm(THREAD);
3136
3137 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3138
3139 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3140 bool trusted = is_trusted_frame(thread, &vfst);
3141 if (trusted) return NULL;
3142
3143 Method* m = vfst.method();
3144 if (!m->is_native()) {
3145 InstanceKlass* holder = m->method_holder();
3146 assert(holder->is_klass(), "just checking");
3147 oop loader = holder->class_loader();
3148 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3149 return JNIHandles::make_local(env, loader);
3150 }
3151 }
3152 }
3153 return NULL;
3154 JVM_END
3155
3156
3157 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3158 JVMWrapper("JVM_GetClassContext");
3159 ResourceMark rm(THREAD);
3160 JvmtiVMObjectAllocEventCollector oam;
3161 vframeStream vfst(thread);
3162
3163 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3164 // This must only be called from SecurityManager.getClassContext
3165 Method* m = vfst.method();
3166 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3167 m->name()->equals(vmSymbols::getClassContext_name()) &&
3168 m->signature()->equals(vmSymbols::void_class_array_signature()))) {
3169 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3170 }
3171 }
3172
3173 // Collect method holders
3174 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3175 for (; !vfst.at_end(); vfst.security_next()) {
3176 Method* m = vfst.method();
3177 // Native frames are not returned
3178 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3179 Klass* holder = m->method_holder();
3180 assert(holder->is_klass(), "just checking");
3181 klass_array->append(holder);
3182 }
3183 }
3184
3185 // Create result array of type [Ljava/lang/Class;
3186 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3187 // Fill in mirrors corresponding to method holders
3188 for (int i = 0; i < klass_array->length(); i++) {
3189 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3190 }
3191
3192 return (jobjectArray) JNIHandles::make_local(env, result);
3193 JVM_END
3194
3195
3196 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3197 JVMWrapper("JVM_ClassDepth");
3198 ResourceMark rm(THREAD);
3199 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3200 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3201
3202 const char* str = java_lang_String::as_utf8_string(class_name_str());
3203 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3204 if (class_name_sym == NULL) {
3205 return -1;
3206 }
3207
3208 int depth = 0;
3209
3210 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3211 if (!vfst.method()->is_native()) {
3212 InstanceKlass* holder = vfst.method()->method_holder();
3213 assert(holder->is_klass(), "just checking");
3214 if (holder->name()->equals(class_name_sym)) {
3215 return depth;
3216 }
3217 depth++;
3218 }
3219 }
3220 return -1;
3221 JVM_END
3222
3223
3224 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3225 JVMWrapper("JVM_ClassLoaderDepth");
3226 ResourceMark rm(THREAD);
3227 int depth = 0;
3228 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3229 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3230 bool trusted = is_trusted_frame(thread, &vfst);
3231 if (trusted) return -1;
3232
3233 Method* m = vfst.method();
3234 if (!m->is_native()) {
3235 InstanceKlass* holder = m->method_holder();
3236 assert(holder->is_klass(), "just checking");
3237 oop loader = holder->class_loader();
3238 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3239 return depth;
3240 }
3241 depth++;
3242 }
3243 }
3244 return -1;
3245 JVM_END
3246
3247
3248 // java.lang.Package ////////////////////////////////////////////////////////////////
3249
3250
3251 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3252 JVMWrapper("JVM_GetSystemPackage");
3253 ResourceMark rm(THREAD);
3254 JvmtiVMObjectAllocEventCollector oam;
3255 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3256 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3257 return (jstring) JNIHandles::make_local(result);
3258 JVM_END
3259
3260
3261 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3262 JVMWrapper("JVM_GetSystemPackages");
3263 JvmtiVMObjectAllocEventCollector oam;
3264 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3265 return (jobjectArray) JNIHandles::make_local(result);
3266 JVM_END
3267
3268
3269 // ObjectInputStream ///////////////////////////////////////////////////////////////
3270
3271 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3272 if (current_class == NULL) {
3273 return true;
3274 }
3275 if ((current_class == field_class) || access.is_public()) {
3276 return true;
3277 }
3278
3279 if (access.is_protected()) {
3280 // See if current_class is a subclass of field_class
3281 if (current_class->is_subclass_of(field_class)) {
3282 return true;
3283 }
3284 }
3285
3286 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3287 }
3288
3289 // Return the first non-null class loader up the execution stack, or null
3290 // if only code from the null class loader is on the stack.
3291
3292 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3293 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3294 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3295 oop loader = vfst.method()->method_holder()->class_loader();
3296 if (loader != NULL) {
3297 return JNIHandles::make_local(env, loader);
3298 }
3299 }
3300 return NULL;
3301 JVM_END
3302
3303
3304 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3305
3306
3307 // resolve array handle and check arguments
3308 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3309 if (arr == NULL) {
3310 THROW_0(vmSymbols::java_lang_NullPointerException());
3311 }
3312 oop a = JNIHandles::resolve_non_null(arr);
3313 if (!a->is_array()) {
3314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3315 } else if (type_array_only && !a->is_typeArray()) {
3316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3317 }
3318 return arrayOop(a);
3319 }
3320
3321
3322 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3323 JVMWrapper("JVM_GetArrayLength");
3324 arrayOop a = check_array(env, arr, false, CHECK_0);
3325 return a->length();
3326 JVM_END
3327
3328
3329 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3330 JVMWrapper("JVM_Array_Get");
3331 JvmtiVMObjectAllocEventCollector oam;
3332 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3333 jvalue value;
3334 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3335 oop box = Reflection::box(&value, type, CHECK_NULL);
3336 return JNIHandles::make_local(env, box);
3337 JVM_END
3338
3339
3340 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3341 JVMWrapper("JVM_GetPrimitiveArrayElement");
3342 jvalue value;
3343 value.i = 0; // to initialize value before getting used in CHECK
3344 arrayOop a = check_array(env, arr, true, CHECK_(value));
3345 assert(a->is_typeArray(), "just checking");
3346 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3347 BasicType wide_type = (BasicType) wCode;
3348 if (type != wide_type) {
3349 Reflection::widen(&value, type, wide_type, CHECK_(value));
3350 }
3351 return value;
3352 JVM_END
3353
3354
3355 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3356 JVMWrapper("JVM_SetArrayElement");
3357 arrayOop a = check_array(env, arr, false, CHECK);
3358 oop box = JNIHandles::resolve(val);
3359 jvalue value;
3360 value.i = 0; // to initialize value before getting used in CHECK
3361 BasicType value_type;
3362 if (a->is_objArray()) {
3363 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3364 value_type = Reflection::unbox_for_regular_object(box, &value);
3365 } else {
3366 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3367 }
3368 Reflection::array_set(&value, a, index, value_type, CHECK);
3369 JVM_END
3370
3371
3372 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3373 JVMWrapper("JVM_SetPrimitiveArrayElement");
3374 arrayOop a = check_array(env, arr, true, CHECK);
3375 assert(a->is_typeArray(), "just checking");
3376 BasicType value_type = (BasicType) vCode;
3377 Reflection::array_set(&v, a, index, value_type, CHECK);
3378 JVM_END
3379
3380
3381 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3382 JVMWrapper("JVM_NewArray");
3383 JvmtiVMObjectAllocEventCollector oam;
3384 oop element_mirror = JNIHandles::resolve(eltClass);
3385 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3386 return JNIHandles::make_local(env, result);
3387 JVM_END
3388
3389
3390 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3391 JVMWrapper("JVM_NewMultiArray");
3392 JvmtiVMObjectAllocEventCollector oam;
3393 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3394 oop element_mirror = JNIHandles::resolve(eltClass);
3395 assert(dim_array->is_typeArray(), "just checking");
3396 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3397 return JNIHandles::make_local(env, result);
3398 JVM_END
3399
3400
3401 // Library support ///////////////////////////////////////////////////////////////////////////
3402
3403 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3404 //%note jvm_ct
3405 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3406 char ebuf[1024];
3407 void *load_result;
3408 {
3409 ThreadToNativeFromVM ttnfvm(thread);
3410 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3411 }
3412 if (load_result == NULL) {
3413 char msg[1024];
3414 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3415 // Since 'ebuf' may contain a string encoded using
3416 // platform encoding scheme, we need to pass
3417 // Exceptions::unsafe_to_utf8 to the new_exception method
3418 // as the last argument. See bug 6367357.
3419 Handle h_exception =
3420 Exceptions::new_exception(thread,
3421 vmSymbols::java_lang_UnsatisfiedLinkError(),
3422 msg, Exceptions::unsafe_to_utf8);
3423
3424 THROW_HANDLE_0(h_exception);
3425 }
3426 return load_result;
3427 JVM_END
3428
3429
3430 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3431 JVMWrapper("JVM_UnloadLibrary");
3432 os::dll_unload(handle);
3433 JVM_END
3434
3435
3436 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3437 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3438 return os::dll_lookup(handle, name);
3439 JVM_END
3440
3441
3442 // JNI version ///////////////////////////////////////////////////////////////////////////////
3443
3444 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3445 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3446 return Threads::is_supported_jni_version_including_1_1(version);
3447 JVM_END
3448
3449
3450 // String support ///////////////////////////////////////////////////////////////////////////
3451
3452 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3453 JVMWrapper("JVM_InternString");
3454 JvmtiVMObjectAllocEventCollector oam;
3455 if (str == NULL) return NULL;
3456 oop string = JNIHandles::resolve_non_null(str);
3457 oop result = StringTable::intern(string, CHECK_NULL);
3458 return (jstring) JNIHandles::make_local(env, result);
3459 JVM_END
3460
3461
3462 // Raw monitor support //////////////////////////////////////////////////////////////////////
3463
3464 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3465 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3466 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3467 // that only works with java threads.
3468
3469
3470 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3471 VM_Exit::block_if_vm_exited();
3472 JVMWrapper("JVM_RawMonitorCreate");
3473 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3474 }
3475
3476
3477 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3478 VM_Exit::block_if_vm_exited();
3479 JVMWrapper("JVM_RawMonitorDestroy");
3480 delete ((Mutex*) mon);
3481 }
3482
3483
3484 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3485 VM_Exit::block_if_vm_exited();
3486 JVMWrapper("JVM_RawMonitorEnter");
3487 ((Mutex*) mon)->jvm_raw_lock();
3488 return 0;
3489 }
3490
3491
3492 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3493 VM_Exit::block_if_vm_exited();
3494 JVMWrapper("JVM_RawMonitorExit");
3495 ((Mutex*) mon)->jvm_raw_unlock();
3496 }
3497
3498
3499 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3500
3501 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3502 Handle loader, Handle protection_domain,
3503 jboolean throwError, TRAPS) {
3504 // Security Note:
3505 // The Java level wrapper will perform the necessary security check allowing
3506 // us to pass the NULL as the initiating class loader. The VM is responsible for
3507 // the checkPackageAccess relative to the initiating class loader via the
3508 // protection_domain. The protection_domain is passed as NULL by the java code
3509 // if there is no security manager in 3-arg Class.forName().
3510 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3511
3512 KlassHandle klass_handle(THREAD, klass);
3513 // Check if we should initialize the class
3514 if (init && klass_handle->oop_is_instance()) {
3515 klass_handle->initialize(CHECK_NULL);
3516 }
3517 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3518 }
3519
3520
3521 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3522
3523 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3524 JVMWrapper("JVM_InvokeMethod");
3525 Handle method_handle;
3526 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3527 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3528 Handle receiver(THREAD, JNIHandles::resolve(obj));
3529 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3530 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3531 jobject res = JNIHandles::make_local(env, result);
3532 if (JvmtiExport::should_post_vm_object_alloc()) {
3533 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3534 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3535 if (java_lang_Class::is_primitive(ret_type)) {
3536 // Only for primitive type vm allocates memory for java object.
3537 // See box() method.
3538 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3539 }
3540 }
3541 return res;
3542 } else {
3543 THROW_0(vmSymbols::java_lang_StackOverflowError());
3544 }
3545 JVM_END
3546
3547
3548 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3549 JVMWrapper("JVM_NewInstanceFromConstructor");
3550 oop constructor_mirror = JNIHandles::resolve(c);
3551 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3552 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3553 jobject res = JNIHandles::make_local(env, result);
3554 if (JvmtiExport::should_post_vm_object_alloc()) {
3555 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3556 }
3557 return res;
3558 JVM_END
3559
3560 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3561
3562 JVM_LEAF(jboolean, JVM_SupportsCX8())
3563 JVMWrapper("JVM_SupportsCX8");
3564 return VM_Version::supports_cx8();
3565 JVM_END
3566
3567 // Returns an array of all live Thread objects (VM internal JavaThreads,
3568 // jvmti agent threads, and JNI attaching threads are skipped)
3569 // See CR 6404306 regarding JNI attaching threads
3570 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3571 ResourceMark rm(THREAD);
3572 ThreadsListEnumerator tle(THREAD, false, false);
3573 JvmtiVMObjectAllocEventCollector oam;
3574
3575 int num_threads = tle.num_threads();
3576 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3577 objArrayHandle threads_ah(THREAD, r);
3578
3579 for (int i = 0; i < num_threads; i++) {
3580 Handle h = tle.get_threadObj(i);
3581 threads_ah->obj_at_put(i, h());
3582 }
3583
3584 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3585 JVM_END
3586
3587
3588 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3589 // Return StackTraceElement[][], each element is the stack trace of a thread in
3590 // the corresponding entry in the given threads array
3591 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3592 JVMWrapper("JVM_DumpThreads");
3593 JvmtiVMObjectAllocEventCollector oam;
3594
3595 // Check if threads is null
3596 if (threads == NULL) {
3597 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3598 }
3599
3600 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3601 objArrayHandle ah(THREAD, a);
3602 int num_threads = ah->length();
3603 // check if threads is non-empty array
3604 if (num_threads == 0) {
3605 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3606 }
3607
3608 // check if threads is not an array of objects of Thread class
3609 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3610 if (k != SystemDictionary::Thread_klass()) {
3611 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3612 }
3613
3614 ResourceMark rm(THREAD);
3615
3616 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3617 for (int i = 0; i < num_threads; i++) {
3618 oop thread_obj = ah->obj_at(i);
3619 instanceHandle h(THREAD, (instanceOop) thread_obj);
3620 thread_handle_array->append(h);
3621 }
3622
3623 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3624 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3625
3626 JVM_END
3627
3628 // JVM monitoring and management support
3629 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3630 return Management::get_jmm_interface(version);
3631 JVM_END
3632
3633 // com.sun.tools.attach.VirtualMachine agent properties support
3634 //
3635 // Initialize the agent properties with the properties maintained in the VM
3636 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3637 JVMWrapper("JVM_InitAgentProperties");
3638 ResourceMark rm;
3639
3640 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3641
3642 PUTPROP(props, "sun.java.command", Arguments::java_command());
3643 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3644 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3645 return properties;
3646 JVM_END
3647
3648 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3649 {
3650 JVMWrapper("JVM_GetEnclosingMethodInfo");
3651 JvmtiVMObjectAllocEventCollector oam;
3652
3653 if (ofClass == NULL) {
3654 return NULL;
3655 }
3656 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3657 // Special handling for primitive objects
3658 if (java_lang_Class::is_primitive(mirror())) {
3659 return NULL;
3660 }
3661 Klass* k = java_lang_Class::as_Klass(mirror());
3662 if (!k->oop_is_instance()) {
3663 return NULL;
3664 }
3665 instanceKlassHandle ik_h(THREAD, k);
3666 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3667 if (encl_method_class_idx == 0) {
3668 return NULL;
3669 }
3670 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3671 objArrayHandle dest(THREAD, dest_o);
3672 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3673 dest->obj_at_put(0, enc_k->java_mirror());
3674 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3675 if (encl_method_method_idx != 0) {
3676 Symbol* sym = ik_h->constants()->symbol_at(
3677 extract_low_short_from_int(
3678 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3679 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3680 dest->obj_at_put(1, str());
3681 sym = ik_h->constants()->symbol_at(
3682 extract_high_short_from_int(
3683 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3684 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3685 dest->obj_at_put(2, str());
3686 }
3687 return (jobjectArray) JNIHandles::make_local(dest());
3688 }
3689 JVM_END
3690
3691 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3692 {
3693 memset(info, 0, info_size);
3694
3695 info->jvm_version = Abstract_VM_Version::jvm_version();
3696 info->update_version = 0; /* 0 in HotSpot Express VM */
3697 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3698
3699 // when we add a new capability in the jvm_version_info struct, we should also
3700 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3701 // counter defined in runtimeService.cpp.
3702 info->is_attachable = AttachListener::is_attach_supported();
3703 }
3704 JVM_END