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/shared/barrierSet.inline.hpp"
33 #include "gc/shared/collectedHeap.inline.hpp"
34 #include "interpreter/bytecode.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/method.hpp"
40 #include "oops/objArrayKlass.hpp"
41 #include "oops/objArrayOop.inline.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() == vmSymbols::java_lang_Class() &&
167 vfst.method()->name() == vmSymbols::forName0_name()) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
171 vfst.method()->name() == vmSymbols::forName_name()) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name() ==
177 vmSymbols::java_lang_ClassLoader() &&
178 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
179 last_caller->name() == 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, oopDesc::bs()->write_barrier(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 oop o = JNIHandles::resolve_non_null(handle);
561 o = oopDesc::bs()->write_barrier(o);
562 Handle obj(THREAD, o);
563 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
564 if (JvmtiExport::should_post_monitor_wait()) {
565 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
566
567 // The current thread already owns the monitor and it has not yet
568 // been added to the wait queue so the current thread cannot be
569 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
570 // event handler cannot accidentally consume an unpark() meant for
571 // the ParkEvent associated with this ObjectMonitor.
572 }
573 ObjectSynchronizer::wait(obj, ms, CHECK);
574 JVM_END
575
576
577 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
578 JVMWrapper("JVM_MonitorNotify");
579 Handle obj(THREAD, oopDesc::bs()->write_barrier(JNIHandles::resolve_non_null(handle)));
580 ObjectSynchronizer::notify(obj, CHECK);
581 JVM_END
582
583
584 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
585 JVMWrapper("JVM_MonitorNotifyAll");
586 Handle obj(THREAD, oopDesc::bs()->write_barrier(JNIHandles::resolve_non_null(handle)));
587 ObjectSynchronizer::notifyall(obj, CHECK);
588 JVM_END
589
590
591 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
592 JVMWrapper("JVM_Clone");
593 Handle obj(THREAD, oopDesc::bs()->read_barrier(JNIHandles::resolve_non_null(handle)));
594 const KlassHandle klass (THREAD, obj->klass());
595 JvmtiVMObjectAllocEventCollector oam;
596
597 #ifdef ASSERT
598 // Just checking that the cloneable flag is set correct
599 if (obj->is_array()) {
600 guarantee(klass->is_cloneable(), "all arrays are cloneable");
601 } else {
602 guarantee(obj->is_instance(), "should be instanceOop");
603 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
604 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
605 }
606 #endif
607
608 // Check if class of obj supports the Cloneable interface.
609 // All arrays are considered to be cloneable (See JLS 20.1.5)
610 if (!klass->is_cloneable()) {
611 ResourceMark rm(THREAD);
612 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
613 }
614
615 // Make shallow object copy
616 const int size = obj->size();
617 oop new_obj_oop = NULL;
618 if (obj->is_array()) {
619 const int length = ((arrayOop)obj())->length();
620 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
621 } else {
622 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
623 }
624
625 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
626 // is modifying a reference field in the clonee, a non-oop-atomic copy might
627 // be suspended in the middle of copying the pointer and end up with parts
628 // of two different pointers in the field. Subsequent dereferences will crash.
629 // 4846409: an oop-copy of objects with long or double fields or arrays of same
630 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
631 // of oops. We know objects are aligned on a minimum of an jlong boundary.
632 // The same is true of StubRoutines::object_copy and the various oop_copy
633 // variants, and of the code generated by the inline_native_clone intrinsic.
634 assert(new_obj_oop == oopDesc::bs()->read_barrier(new_obj_oop), "expect to-space copy");
635 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
636 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
637 (size_t)align_object_size(size) / HeapWordsPerLong);
638 // Clear the header
639 new_obj_oop->init_mark();
640
641 // Store check (mark entire object and let gc sort it out)
642 BarrierSet* bs = Universe::heap()->barrier_set();
643 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
644 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
645
646 Handle new_obj(THREAD, new_obj_oop);
647 // Special handling for MemberNames. Since they contain Method* metadata, they
648 // must be registered so that RedefineClasses can fix metadata contained in them.
649 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
650 java_lang_invoke_MemberName::is_method(new_obj())) {
651 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
652 // MemberName may be unresolved, so doesn't need registration until resolved.
653 if (method != NULL) {
654 methodHandle m(THREAD, method);
655 // This can safepoint and redefine method, so need both new_obj and method
656 // in a handle, for two different reasons. new_obj can move, method can be
657 // deleted if nothing is using it on the stack.
658 m->method_holder()->add_member_name(new_obj());
659 }
660 }
661
662 // Caution: this involves a java upcall, so the clone should be
663 // "gc-robust" by this stage.
664 if (klass->has_finalizer()) {
665 assert(obj->is_instance(), "should be instanceOop");
666 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
667 new_obj = Handle(THREAD, new_obj_oop);
668 }
669
670 return JNIHandles::make_local(env, new_obj());
671 JVM_END
672
673 // java.io.File ///////////////////////////////////////////////////////////////
674
675 JVM_LEAF(char*, JVM_NativePath(char* path))
676 JVMWrapper2("JVM_NativePath (%s)", path);
677 return os::native_path(path);
678 JVM_END
679
680
681 // Misc. class handling ///////////////////////////////////////////////////////////
682
683
684 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
685 JVMWrapper("JVM_GetCallerClass");
686
687 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
688 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
689 // temporarily for existing code to use until a replacement API is defined.
690 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
691 Klass* k = thread->security_get_caller_class(depth);
692 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
693 }
694
695 // Getting the class of the caller frame.
696 //
697 // The call stack at this point looks something like this:
698 //
699 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
700 // [1] [ @CallerSensitive API.method ]
701 // [.] [ (skipped intermediate frames) ]
702 // [n] [ caller ]
703 vframeStream vfst(thread);
704 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
705 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
706 Method* m = vfst.method();
707 assert(m != NULL, "sanity");
708 switch (n) {
709 case 0:
710 // This must only be called from Reflection.getCallerClass
711 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
712 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
713 }
714 // fall-through
715 case 1:
716 // Frame 0 and 1 must be caller sensitive.
717 if (!m->caller_sensitive()) {
718 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
719 }
720 break;
721 default:
722 if (!m->is_ignored_by_security_stack_walk()) {
723 // We have reached the desired frame; return the holder class.
724 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
725 }
726 break;
727 }
728 }
729 return NULL;
730 JVM_END
731
732
733 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
734 JVMWrapper("JVM_FindPrimitiveClass");
735 oop mirror = NULL;
736 BasicType t = name2type(utf);
737 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
738 mirror = Universe::java_mirror(t);
739 }
740 if (mirror == NULL) {
741 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
742 } else {
743 return (jclass) JNIHandles::make_local(env, mirror);
744 }
745 JVM_END
746
747
748 // Returns a class loaded by the bootstrap class loader; or null
749 // if not found. ClassNotFoundException is not thrown.
750 // FindClassFromBootLoader is exported to the launcher for windows.
751 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
752 const char* name))
753 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
754
755 // Java libraries should ensure that name is never null...
756 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
757 // It's impossible to create this class; the name cannot fit
758 // into the constant pool.
759 return NULL;
760 }
761
762 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
763 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
764 if (k == NULL) {
765 return NULL;
766 }
767
768 if (TraceClassResolution) {
769 trace_class_resolution(k);
770 }
771 return (jclass) JNIHandles::make_local(env, k->java_mirror());
772 JVM_END
773
774 // Find a class with this name in this loader, using the caller's protection domain.
775 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
776 jboolean init, jobject loader,
777 jclass caller))
778 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
779 // Java libraries should ensure that name is never null...
780 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
781 // It's impossible to create this class; the name cannot fit
782 // into the constant pool.
783 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
784 }
785
786 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
787
788 oop loader_oop = JNIHandles::resolve(loader);
789 oop from_class = JNIHandles::resolve(caller);
790 oop protection_domain = NULL;
791 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
792 // NPE. Put it in another way, the bootstrap class loader has all permission and
793 // thus no checkPackageAccess equivalence in the VM class loader.
794 // The caller is also passed as NULL by the java code if there is no security
795 // manager to avoid the performance cost of getting the calling class.
796 if (from_class != NULL && loader_oop != NULL) {
797 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
798 }
799
800 Handle h_loader(THREAD, loader_oop);
801 Handle h_prot(THREAD, protection_domain);
802 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
803 h_prot, false, THREAD);
804
805 if (TraceClassResolution && result != NULL) {
806 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
807 }
808 return result;
809 JVM_END
810
811 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
812 jboolean init, jclass from))
813 JVMWrapper2("JVM_FindClassFromClass %s", name);
814 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
815 // It's impossible to create this class; the name cannot fit
816 // into the constant pool.
817 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
818 }
819 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
820 oop from_class_oop = JNIHandles::resolve(from);
821 Klass* from_class = (from_class_oop == NULL)
822 ? (Klass*)NULL
823 : java_lang_Class::as_Klass(from_class_oop);
824 oop class_loader = NULL;
825 oop protection_domain = NULL;
826 if (from_class != NULL) {
827 class_loader = from_class->class_loader();
828 protection_domain = from_class->protection_domain();
829 }
830 Handle h_loader(THREAD, class_loader);
831 Handle h_prot (THREAD, protection_domain);
832 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
833 h_prot, true, thread);
834
835 if (TraceClassResolution && result != NULL) {
836 // this function is generally only used for class loading during verification.
837 ResourceMark rm;
838 oop from_mirror = JNIHandles::resolve_non_null(from);
839 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
840 const char * from_name = from_class->external_name();
841
842 oop mirror = JNIHandles::resolve_non_null(result);
843 Klass* to_class = java_lang_Class::as_Klass(mirror);
844 const char * to = to_class->external_name();
845 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
846 }
847
848 return result;
849 JVM_END
850
851 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
852 if (loader.is_null()) {
853 return;
854 }
855
856 // check whether the current caller thread holds the lock or not.
857 // If not, increment the corresponding counter
858 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
859 ObjectSynchronizer::owner_self) {
860 counter->inc();
861 }
862 }
863
864 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
865 // and JVM_DefineClassWithSourceCond()
866 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
867 jobject loader, const jbyte *buf,
868 jsize len, jobject pd, const char *source,
869 jboolean verify, TRAPS) {
870 if (source == NULL) source = "__JVM_DefineClass__";
871
872 assert(THREAD->is_Java_thread(), "must be a JavaThread");
873 JavaThread* jt = (JavaThread*) THREAD;
874
875 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
876 ClassLoader::perf_define_appclass_selftime(),
877 ClassLoader::perf_define_appclasses(),
878 jt->get_thread_stat()->perf_recursion_counts_addr(),
879 jt->get_thread_stat()->perf_timers_addr(),
880 PerfClassTraceTime::DEFINE_CLASS);
881
882 if (UsePerfData) {
883 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
884 }
885
886 // Since exceptions can be thrown, class initialization can take place
887 // if name is NULL no check for class name in .class stream has to be made.
888 TempNewSymbol class_name = NULL;
889 if (name != NULL) {
890 const int str_len = (int)strlen(name);
891 if (str_len > Symbol::max_length()) {
892 // It's impossible to create this class; the name cannot fit
893 // into the constant pool.
894 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
895 }
896 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
897 }
898
899 ResourceMark rm(THREAD);
900 ClassFileStream st((u1*) buf, len, (char *)source);
901 Handle class_loader (THREAD, oopDesc::bs()->write_barrier(JNIHandles::resolve(loader)));
902 if (UsePerfData) {
903 is_lock_held_by_thread(class_loader,
904 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
905 THREAD);
906 }
907 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
908 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
909 protection_domain, &st,
910 verify != 0,
911 CHECK_NULL);
912
913 if (TraceClassResolution && k != NULL) {
914 trace_class_resolution(k);
915 }
916
917 return (jclass) JNIHandles::make_local(env, k->java_mirror());
918 }
919
920
921 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
922 JVMWrapper2("JVM_DefineClass %s", name);
923
924 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
925 JVM_END
926
927
928 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
929 JVMWrapper2("JVM_DefineClassWithSource %s", name);
930
931 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
932 JVM_END
933
934 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
935 jobject loader, const jbyte *buf,
936 jsize len, jobject pd,
937 const char *source, jboolean verify))
938 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
939
940 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
941 JVM_END
942
943 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
944 JVMWrapper("JVM_FindLoadedClass");
945 ResourceMark rm(THREAD);
946
947 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
948 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
949
950 const char* str = java_lang_String::as_utf8_string(string());
951 // Sanity check, don't expect null
952 if (str == NULL) return NULL;
953
954 const int str_len = (int)strlen(str);
955 if (str_len > Symbol::max_length()) {
956 // It's impossible to create this class; the name cannot fit
957 // into the constant pool.
958 return NULL;
959 }
960 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
961
962 // Security Note:
963 // The Java level wrapper will perform the necessary security check allowing
964 // us to pass the NULL as the initiating class loader.
965 Handle h_loader(THREAD, oopDesc::bs()->write_barrier(JNIHandles::resolve(loader)));
966 if (UsePerfData) {
967 is_lock_held_by_thread(h_loader,
968 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
969 THREAD);
970 }
971
972 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
973 h_loader,
974 Handle(),
975 CHECK_NULL);
976 #if INCLUDE_CDS
977 if (k == NULL) {
978 // If the class is not already loaded, try to see if it's in the shared
979 // archive for the current classloader (h_loader).
980 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
981 klass_name, h_loader, CHECK_NULL);
982 k = ik();
983 }
984 #endif
985 return (k == NULL) ? NULL :
986 (jclass) JNIHandles::make_local(env, k->java_mirror());
987 JVM_END
988
989
990 // Reflection support //////////////////////////////////////////////////////////////////////////////
991
992 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
993 assert (cls != NULL, "illegal class");
994 JVMWrapper("JVM_GetClassName");
995 JvmtiVMObjectAllocEventCollector oam;
996 ResourceMark rm(THREAD);
997 const char* name;
998 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
999 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1000 } else {
1001 // Consider caching interned string in Klass
1002 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1003 assert(k->is_klass(), "just checking");
1004 name = k->external_name();
1005 }
1006 oop result = StringTable::intern((char*) name, CHECK_NULL);
1007 return (jstring) JNIHandles::make_local(env, result);
1008 JVM_END
1009
1010
1011 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1012 JVMWrapper("JVM_GetClassInterfaces");
1013 JvmtiVMObjectAllocEventCollector oam;
1014 oop mirror = JNIHandles::resolve_non_null(cls);
1015
1016 // Special handling for primitive objects
1017 if (java_lang_Class::is_primitive(mirror)) {
1018 // Primitive objects does not have any interfaces
1019 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1020 return (jobjectArray) JNIHandles::make_local(env, r);
1021 }
1022
1023 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1024 // Figure size of result array
1025 int size;
1026 if (klass->oop_is_instance()) {
1027 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1028 } else {
1029 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1030 size = 2;
1031 }
1032
1033 // Allocate result array
1034 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1035 objArrayHandle result (THREAD, r);
1036 // Fill in result
1037 if (klass->oop_is_instance()) {
1038 // Regular instance klass, fill in all local interfaces
1039 for (int index = 0; index < size; index++) {
1040 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1041 result->obj_at_put(index, k->java_mirror());
1042 }
1043 } else {
1044 // All arrays implement java.lang.Cloneable and java.io.Serializable
1045 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1046 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1047 }
1048 return (jobjectArray) JNIHandles::make_local(env, result());
1049 JVM_END
1050
1051
1052 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1053 JVMWrapper("JVM_IsInterface");
1054 oop mirror = JNIHandles::resolve_non_null(cls);
1055 if (java_lang_Class::is_primitive(mirror)) {
1056 return JNI_FALSE;
1057 }
1058 Klass* k = java_lang_Class::as_Klass(mirror);
1059 jboolean result = k->is_interface();
1060 assert(!result || k->oop_is_instance(),
1061 "all interfaces are instance types");
1062 // The compiler intrinsic for isInterface tests the
1063 // Klass::_access_flags bits in the same way.
1064 return result;
1065 JVM_END
1066
1067
1068 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1069 JVMWrapper("JVM_GetClassSigners");
1070 JvmtiVMObjectAllocEventCollector oam;
1071 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1072 // There are no signers for primitive types
1073 return NULL;
1074 }
1075
1076 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1077
1078 // If there are no signers set in the class, or if the class
1079 // is an array, return NULL.
1080 if (signers == NULL) return NULL;
1081
1082 // copy of the signers array
1083 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1084 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1085 for (int index = 0; index < signers->length(); index++) {
1086 signers_copy->obj_at_put(index, signers->obj_at(index));
1087 }
1088
1089 // return the copy
1090 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1091 JVM_END
1092
1093
1094 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1095 JVMWrapper("JVM_SetClassSigners");
1096 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1097 // This call is ignored for primitive types and arrays.
1098 // Signers are only set once, ClassLoader.java, and thus shouldn't
1099 // be called with an array. Only the bootstrap loader creates arrays.
1100 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1101 if (k->oop_is_instance()) {
1102 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1103 }
1104 }
1105 JVM_END
1106
1107
1108 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1109 JVMWrapper("JVM_GetProtectionDomain");
1110 if (JNIHandles::resolve(cls) == NULL) {
1111 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1112 }
1113
1114 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1115 // Primitive types does not have a protection domain.
1116 return NULL;
1117 }
1118
1119 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1120 return (jobject) JNIHandles::make_local(env, pd);
1121 JVM_END
1122
1123
1124 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1125 // If there is a security manager and protection domain, check the access
1126 // in the protection domain, otherwise it is authorized.
1127 if (java_lang_System::has_security_manager()) {
1128
1129 // For bootstrapping, if pd implies method isn't in the JDK, allow
1130 // this context to revert to older behavior.
1131 // In this case the isAuthorized field in AccessControlContext is also not
1132 // present.
1133 if (Universe::protection_domain_implies_method() == NULL) {
1134 return true;
1135 }
1136
1137 // Whitelist certain access control contexts
1138 if (java_security_AccessControlContext::is_authorized(context)) {
1139 return true;
1140 }
1141
1142 oop prot = klass->protection_domain();
1143 if (prot != NULL) {
1144 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1145 // in the new wrapper.
1146 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1147 Handle h_prot(THREAD, prot);
1148 JavaValue result(T_BOOLEAN);
1149 JavaCallArguments args(h_prot);
1150 JavaCalls::call(&result, m, &args, CHECK_false);
1151 return (result.get_jboolean() != 0);
1152 }
1153 }
1154 return true;
1155 }
1156
1157 // Create an AccessControlContext with a protection domain with null codesource
1158 // and null permissions - which gives no permissions.
1159 oop create_dummy_access_control_context(TRAPS) {
1160 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1161 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1162 // Call constructor ProtectionDomain(null, null);
1163 JavaValue result(T_VOID);
1164 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1165 vmSymbols::object_initializer_name(),
1166 vmSymbols::codesource_permissioncollection_signature(),
1167 Handle(), Handle(), CHECK_NULL);
1168
1169 // new ProtectionDomain[] {pd};
1170 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1171 context->obj_at_put(0, obj());
1172
1173 // new AccessControlContext(new ProtectionDomain[] {pd})
1174 objArrayHandle h_context(THREAD, context);
1175 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1176 return acc;
1177 }
1178
1179 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1180 JVMWrapper("JVM_DoPrivileged");
1181
1182 if (action == NULL) {
1183 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1184 }
1185
1186 // Compute the frame initiating the do privileged operation and setup the privileged stack
1187 vframeStream vfst(thread);
1188 vfst.security_get_caller_frame(1);
1189
1190 if (vfst.at_end()) {
1191 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1192 }
1193
1194 Method* method = vfst.method();
1195 instanceKlassHandle klass (THREAD, method->method_holder());
1196
1197 // Check that action object understands "Object run()"
1198 Handle h_context;
1199 if (context != NULL) {
1200 h_context = Handle(THREAD, JNIHandles::resolve(context));
1201 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1202 if (!authorized) {
1203 // Create an unprivileged access control object and call it's run function
1204 // instead.
1205 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1206 h_context = Handle(THREAD, noprivs);
1207 }
1208 }
1209
1210 // Check that action object understands "Object run()"
1211 Handle object (THREAD, JNIHandles::resolve(action));
1212
1213 // get run() method
1214 Method* m_oop = object->klass()->uncached_lookup_method(
1215 vmSymbols::run_method_name(),
1216 vmSymbols::void_object_signature(),
1217 Klass::find_overpass);
1218 methodHandle m (THREAD, m_oop);
1219 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1220 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1221 }
1222
1223 // Stack allocated list of privileged stack elements
1224 PrivilegedElement pi;
1225 if (!vfst.at_end()) {
1226 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1227 thread->set_privileged_stack_top(&pi);
1228 }
1229
1230
1231 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1232 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1233 Handle pending_exception;
1234 JavaValue result(T_OBJECT);
1235 JavaCallArguments args(object);
1236 JavaCalls::call(&result, m, &args, THREAD);
1237
1238 // done with action, remove ourselves from the list
1239 if (!vfst.at_end()) {
1240 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1241 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1242 }
1243
1244 if (HAS_PENDING_EXCEPTION) {
1245 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1246 CLEAR_PENDING_EXCEPTION;
1247 // JVMTI has already reported the pending exception
1248 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1249 if (THREAD->is_Java_thread()) {
1250 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1251 }
1252 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1253 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1254 // Throw a java.security.PrivilegedActionException(Exception e) exception
1255 JavaCallArguments args(pending_exception);
1256 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1257 vmSymbols::exception_void_signature(),
1258 &args);
1259 }
1260 }
1261
1262 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1263 return JNIHandles::make_local(env, (oop) result.get_jobject());
1264 JVM_END
1265
1266
1267 // Returns the inherited_access_control_context field of the running thread.
1268 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1269 JVMWrapper("JVM_GetInheritedAccessControlContext");
1270 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1271 return JNIHandles::make_local(env, result);
1272 JVM_END
1273
1274 class RegisterArrayForGC {
1275 private:
1276 JavaThread *_thread;
1277 public:
1278 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1279 _thread = thread;
1280 _thread->register_array_for_gc(array);
1281 }
1282
1283 ~RegisterArrayForGC() {
1284 _thread->register_array_for_gc(NULL);
1285 }
1286 };
1287
1288
1289 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1290 JVMWrapper("JVM_GetStackAccessControlContext");
1291 if (!UsePrivilegedStack) return NULL;
1292
1293 ResourceMark rm(THREAD);
1294 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1295 JvmtiVMObjectAllocEventCollector oam;
1296
1297 // count the protection domains on the execution stack. We collapse
1298 // duplicate consecutive protection domains into a single one, as
1299 // well as stopping when we hit a privileged frame.
1300
1301 // Use vframeStream to iterate through Java frames
1302 vframeStream vfst(thread);
1303
1304 oop previous_protection_domain = NULL;
1305 Handle privileged_context(thread, NULL);
1306 bool is_privileged = false;
1307 oop protection_domain = NULL;
1308
1309 for(; !vfst.at_end(); vfst.next()) {
1310 // get method of frame
1311 Method* method = vfst.method();
1312 intptr_t* frame_id = vfst.frame_id();
1313
1314 // check the privileged frames to see if we have a match
1315 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1316 // this frame is privileged
1317 is_privileged = true;
1318 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1319 protection_domain = thread->privileged_stack_top()->protection_domain();
1320 } else {
1321 protection_domain = method->method_holder()->protection_domain();
1322 }
1323
1324 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1325 local_array->push(protection_domain);
1326 previous_protection_domain = protection_domain;
1327 }
1328
1329 if (is_privileged) break;
1330 }
1331
1332
1333 // either all the domains on the stack were system domains, or
1334 // we had a privileged system domain
1335 if (local_array->is_empty()) {
1336 if (is_privileged && privileged_context.is_null()) return NULL;
1337
1338 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1339 return JNIHandles::make_local(env, result);
1340 }
1341
1342 // the resource area must be registered in case of a gc
1343 RegisterArrayForGC ragc(thread, local_array);
1344 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1345 local_array->length(), CHECK_NULL);
1346 objArrayHandle h_context(thread, context);
1347 for (int index = 0; index < local_array->length(); index++) {
1348 h_context->obj_at_put(index, local_array->at(index));
1349 }
1350
1351 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1352
1353 return JNIHandles::make_local(env, result);
1354 JVM_END
1355
1356
1357 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1358 JVMWrapper("JVM_IsArrayClass");
1359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1360 return (k != NULL) && k->oop_is_array() ? true : false;
1361 JVM_END
1362
1363
1364 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1365 JVMWrapper("JVM_IsPrimitiveClass");
1366 oop mirror = JNIHandles::resolve_non_null(cls);
1367 return (jboolean) java_lang_Class::is_primitive(mirror);
1368 JVM_END
1369
1370
1371 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1372 JVMWrapper("JVM_GetClassModifiers");
1373 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1374 // Primitive type
1375 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1376 }
1377
1378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1379 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1380 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1381 return k->modifier_flags();
1382 JVM_END
1383
1384
1385 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1386
1387 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1388 JvmtiVMObjectAllocEventCollector oam;
1389 // ofClass is a reference to a java_lang_Class object. The mirror object
1390 // of an InstanceKlass
1391
1392 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1393 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1394 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1395 return (jobjectArray)JNIHandles::make_local(env, result);
1396 }
1397
1398 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1399 InnerClassesIterator iter(k);
1400
1401 if (iter.length() == 0) {
1402 // Neither an inner nor outer class
1403 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1404 return (jobjectArray)JNIHandles::make_local(env, result);
1405 }
1406
1407 // find inner class info
1408 constantPoolHandle cp(thread, k->constants());
1409 int length = iter.length();
1410
1411 // Allocate temp. result array
1412 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1413 objArrayHandle result (THREAD, r);
1414 int members = 0;
1415
1416 for (; !iter.done(); iter.next()) {
1417 int ioff = iter.inner_class_info_index();
1418 int ooff = iter.outer_class_info_index();
1419
1420 if (ioff != 0 && ooff != 0) {
1421 // Check to see if the name matches the class we're looking for
1422 // before attempting to find the class.
1423 if (cp->klass_name_at_matches(k, ooff)) {
1424 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1425 if (outer_klass == k()) {
1426 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1427 instanceKlassHandle inner_klass (THREAD, ik);
1428
1429 // Throws an exception if outer klass has not declared k as
1430 // an inner klass
1431 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1432
1433 result->obj_at_put(members, inner_klass->java_mirror());
1434 members++;
1435 }
1436 }
1437 }
1438 }
1439
1440 if (members != length) {
1441 // Return array of right length
1442 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1443 for(int i = 0; i < members; i++) {
1444 res->obj_at_put(i, result->obj_at(i));
1445 }
1446 return (jobjectArray)JNIHandles::make_local(env, res);
1447 }
1448
1449 return (jobjectArray)JNIHandles::make_local(env, result());
1450 JVM_END
1451
1452
1453 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1454 {
1455 // ofClass is a reference to a java_lang_Class object.
1456 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1457 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1458 return NULL;
1459 }
1460
1461 bool inner_is_member = false;
1462 Klass* outer_klass
1463 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1464 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1465 if (outer_klass == NULL) return NULL; // already a top-level class
1466 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1467 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1468 }
1469 JVM_END
1470
1471 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1472 {
1473 oop mirror = JNIHandles::resolve_non_null(cls);
1474 if (java_lang_Class::is_primitive(mirror) ||
1475 !java_lang_Class::as_Klass(mirror)->oop_is_instance()) {
1476 return NULL;
1477 }
1478 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1479 int ooff = 0, noff = 0;
1480 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1481 if (noff != 0) {
1482 constantPoolHandle i_cp(thread, k->constants());
1483 Symbol* name = i_cp->symbol_at(noff);
1484 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1485 return (jstring) JNIHandles::make_local(env, str());
1486 }
1487 }
1488 return NULL;
1489 }
1490 JVM_END
1491
1492 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1493 assert (cls != NULL, "illegal class");
1494 JVMWrapper("JVM_GetClassSignature");
1495 JvmtiVMObjectAllocEventCollector oam;
1496 ResourceMark rm(THREAD);
1497 // Return null for arrays and primatives
1498 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1500 if (k->oop_is_instance()) {
1501 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1502 if (sym == NULL) return NULL;
1503 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1504 return (jstring) JNIHandles::make_local(env, str());
1505 }
1506 }
1507 return NULL;
1508 JVM_END
1509
1510
1511 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1512 assert (cls != NULL, "illegal class");
1513 JVMWrapper("JVM_GetClassAnnotations");
1514
1515 // Return null for arrays and primitives
1516 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1518 if (k->oop_is_instance()) {
1519 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1520 return (jbyteArray) JNIHandles::make_local(env, a);
1521 }
1522 }
1523 return NULL;
1524 JVM_END
1525
1526
1527 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1528 // some of this code was adapted from from jni_FromReflectedField
1529
1530 oop reflected = JNIHandles::resolve_non_null(field);
1531 oop mirror = java_lang_reflect_Field::clazz(reflected);
1532 Klass* k = java_lang_Class::as_Klass(mirror);
1533 int slot = java_lang_reflect_Field::slot(reflected);
1534 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1535
1536 KlassHandle kh(THREAD, k);
1537 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1538
1539 if (modifiers & JVM_ACC_STATIC) {
1540 // for static fields we only look in the current class
1541 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1542 assert(false, "cannot find static field");
1543 return false;
1544 }
1545 } else {
1546 // for instance fields we start with the current class and work
1547 // our way up through the superclass chain
1548 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1549 assert(false, "cannot find instance field");
1550 return false;
1551 }
1552 }
1553 return true;
1554 }
1555
1556 static Method* jvm_get_method_common(jobject method) {
1557 // some of this code was adapted from from jni_FromReflectedMethod
1558
1559 oop reflected = JNIHandles::resolve_non_null(method);
1560 oop mirror = NULL;
1561 int slot = 0;
1562
1563 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1564 mirror = java_lang_reflect_Constructor::clazz(reflected);
1565 slot = java_lang_reflect_Constructor::slot(reflected);
1566 } else {
1567 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1568 "wrong type");
1569 mirror = java_lang_reflect_Method::clazz(reflected);
1570 slot = java_lang_reflect_Method::slot(reflected);
1571 }
1572 Klass* k = java_lang_Class::as_Klass(mirror);
1573
1574 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1575 assert(m != NULL, "cannot find method");
1576 return m; // caller has to deal with NULL in product mode
1577 }
1578
1579 /* Type use annotations support (JDK 1.8) */
1580
1581 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1582 assert (cls != NULL, "illegal class");
1583 JVMWrapper("JVM_GetClassTypeAnnotations");
1584 ResourceMark rm(THREAD);
1585 // Return null for arrays and primitives
1586 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1588 if (k->oop_is_instance()) {
1589 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1590 if (type_annotations != NULL) {
1591 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1592 return (jbyteArray) JNIHandles::make_local(env, a);
1593 }
1594 }
1595 }
1596 return NULL;
1597 JVM_END
1598
1599 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1600 assert (method != NULL, "illegal method");
1601 JVMWrapper("JVM_GetMethodTypeAnnotations");
1602
1603 // method is a handle to a java.lang.reflect.Method object
1604 Method* m = jvm_get_method_common(method);
1605 if (m == NULL) {
1606 return NULL;
1607 }
1608
1609 AnnotationArray* type_annotations = m->type_annotations();
1610 if (type_annotations != NULL) {
1611 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1612 return (jbyteArray) JNIHandles::make_local(env, a);
1613 }
1614
1615 return NULL;
1616 JVM_END
1617
1618 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1619 assert (field != NULL, "illegal field");
1620 JVMWrapper("JVM_GetFieldTypeAnnotations");
1621
1622 fieldDescriptor fd;
1623 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1624 if (!gotFd) {
1625 return NULL;
1626 }
1627
1628 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1629 JVM_END
1630
1631 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1632 if (!cp->is_within_bounds(index)) {
1633 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1634 }
1635 }
1636
1637 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1638 {
1639 JVMWrapper("JVM_GetMethodParameters");
1640 // method is a handle to a java.lang.reflect.Method object
1641 Method* method_ptr = jvm_get_method_common(method);
1642 methodHandle mh (THREAD, method_ptr);
1643 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1644 const int num_params = mh->method_parameters_length();
1645
1646 if (num_params < 0) {
1647 // A -1 return value from method_parameters_length means there is no
1648 // parameter data. Return null to indicate this to the reflection
1649 // API.
1650 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1651 return (jobjectArray)NULL;
1652 } else {
1653 // Otherwise, we return something up to reflection, even if it is
1654 // a zero-length array. Why? Because in some cases this can
1655 // trigger a MalformedParametersException.
1656
1657 // make sure all the symbols are properly formatted
1658 for (int i = 0; i < num_params; i++) {
1659 MethodParametersElement* params = mh->method_parameters_start();
1660 int index = params[i].name_cp_index;
1661 bounds_check(mh->constants(), index, CHECK_NULL);
1662
1663 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1664 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1665 "Wrong type at constant pool index");
1666 }
1667
1668 }
1669
1670 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1671 objArrayHandle result (THREAD, result_oop);
1672
1673 for (int i = 0; i < num_params; i++) {
1674 MethodParametersElement* params = mh->method_parameters_start();
1675 // For a 0 index, give a NULL symbol
1676 Symbol* sym = 0 != params[i].name_cp_index ?
1677 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1678 int flags = params[i].flags;
1679 oop param = Reflection::new_parameter(reflected_method, i, sym,
1680 flags, CHECK_NULL);
1681 result->obj_at_put(i, param);
1682 }
1683 return (jobjectArray)JNIHandles::make_local(env, result());
1684 }
1685 }
1686 JVM_END
1687
1688 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1689
1690 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1691 {
1692 JVMWrapper("JVM_GetClassDeclaredFields");
1693 JvmtiVMObjectAllocEventCollector oam;
1694
1695 // Exclude primitive types and array types
1696 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1697 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1698 // Return empty array
1699 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1700 return (jobjectArray) JNIHandles::make_local(env, res);
1701 }
1702
1703 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1704 constantPoolHandle cp(THREAD, k->constants());
1705
1706 // Ensure class is linked
1707 k->link_class(CHECK_NULL);
1708
1709 // 4496456 We need to filter out java.lang.Throwable.backtrace
1710 bool skip_backtrace = false;
1711
1712 // Allocate result
1713 int num_fields;
1714
1715 if (publicOnly) {
1716 num_fields = 0;
1717 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1718 if (fs.access_flags().is_public()) ++num_fields;
1719 }
1720 } else {
1721 num_fields = k->java_fields_count();
1722
1723 if (k() == SystemDictionary::Throwable_klass()) {
1724 num_fields--;
1725 skip_backtrace = true;
1726 }
1727 }
1728
1729 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1730 objArrayHandle result (THREAD, r);
1731
1732 int out_idx = 0;
1733 fieldDescriptor fd;
1734 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1735 if (skip_backtrace) {
1736 // 4496456 skip java.lang.Throwable.backtrace
1737 int offset = fs.offset();
1738 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1739 }
1740
1741 if (!publicOnly || fs.access_flags().is_public()) {
1742 fd.reinitialize(k(), fs.index());
1743 oop field = Reflection::new_field(&fd, CHECK_NULL);
1744 result->obj_at_put(out_idx, field);
1745 ++out_idx;
1746 }
1747 }
1748 assert(out_idx == num_fields, "just checking");
1749 return (jobjectArray) JNIHandles::make_local(env, result());
1750 }
1751 JVM_END
1752
1753 static bool select_method(methodHandle method, bool want_constructor) {
1754 if (want_constructor) {
1755 return (method->is_initializer() && !method->is_static());
1756 } else {
1757 return (!method->is_initializer() && !method->is_overpass());
1758 }
1759 }
1760
1761 static jobjectArray get_class_declared_methods_helper(
1762 JNIEnv *env,
1763 jclass ofClass, jboolean publicOnly,
1764 bool want_constructor,
1765 Klass* klass, TRAPS) {
1766
1767 JvmtiVMObjectAllocEventCollector oam;
1768
1769 // Exclude primitive types and array types
1770 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1771 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1772 // Return empty array
1773 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1774 return (jobjectArray) JNIHandles::make_local(env, res);
1775 }
1776
1777 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1778
1779 // Ensure class is linked
1780 k->link_class(CHECK_NULL);
1781
1782 Array<Method*>* methods = k->methods();
1783 int methods_length = methods->length();
1784
1785 // Save original method_idnum in case of redefinition, which can change
1786 // the idnum of obsolete methods. The new method will have the same idnum
1787 // but if we refresh the methods array, the counts will be wrong.
1788 ResourceMark rm(THREAD);
1789 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1790 int num_methods = 0;
1791
1792 for (int i = 0; i < methods_length; i++) {
1793 methodHandle method(THREAD, methods->at(i));
1794 if (select_method(method, want_constructor)) {
1795 if (!publicOnly || method->is_public()) {
1796 idnums->push(method->method_idnum());
1797 ++num_methods;
1798 }
1799 }
1800 }
1801
1802 // Allocate result
1803 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1804 objArrayHandle result (THREAD, r);
1805
1806 // Now just put the methods that we selected above, but go by their idnum
1807 // in case of redefinition. The methods can be redefined at any safepoint,
1808 // so above when allocating the oop array and below when creating reflect
1809 // objects.
1810 for (int i = 0; i < num_methods; i++) {
1811 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1812 if (method.is_null()) {
1813 // Method may have been deleted and seems this API can handle null
1814 // Otherwise should probably put a method that throws NSME
1815 result->obj_at_put(i, NULL);
1816 } else {
1817 oop m;
1818 if (want_constructor) {
1819 m = Reflection::new_constructor(method, CHECK_NULL);
1820 } else {
1821 m = Reflection::new_method(method, false, CHECK_NULL);
1822 }
1823 result->obj_at_put(i, m);
1824 }
1825 }
1826
1827 return (jobjectArray) JNIHandles::make_local(env, result());
1828 }
1829
1830 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1831 {
1832 JVMWrapper("JVM_GetClassDeclaredMethods");
1833 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1834 /*want_constructor*/ false,
1835 SystemDictionary::reflect_Method_klass(), THREAD);
1836 }
1837 JVM_END
1838
1839 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1840 {
1841 JVMWrapper("JVM_GetClassDeclaredConstructors");
1842 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1843 /*want_constructor*/ true,
1844 SystemDictionary::reflect_Constructor_klass(), THREAD);
1845 }
1846 JVM_END
1847
1848 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1849 {
1850 JVMWrapper("JVM_GetClassAccessFlags");
1851 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1852 // Primitive type
1853 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1854 }
1855
1856 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1857 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1858 }
1859 JVM_END
1860
1861
1862 // Constant pool access //////////////////////////////////////////////////////////
1863
1864 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1865 {
1866 JVMWrapper("JVM_GetClassConstantPool");
1867 JvmtiVMObjectAllocEventCollector oam;
1868
1869 // Return null for primitives and arrays
1870 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1871 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1872 if (k->oop_is_instance()) {
1873 instanceKlassHandle k_h(THREAD, k);
1874 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1875 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1876 return JNIHandles::make_local(jcp());
1877 }
1878 }
1879 return NULL;
1880 }
1881 JVM_END
1882
1883
1884 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1885 {
1886 JVMWrapper("JVM_ConstantPoolGetSize");
1887 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1888 return cp->length();
1889 }
1890 JVM_END
1891
1892
1893 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1894 {
1895 JVMWrapper("JVM_ConstantPoolGetClassAt");
1896 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1897 bounds_check(cp, index, CHECK_NULL);
1898 constantTag tag = cp->tag_at(index);
1899 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1900 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1901 }
1902 Klass* k = cp->klass_at(index, CHECK_NULL);
1903 return (jclass) JNIHandles::make_local(k->java_mirror());
1904 }
1905 JVM_END
1906
1907 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1908 {
1909 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1910 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1911 bounds_check(cp, index, CHECK_NULL);
1912 constantTag tag = cp->tag_at(index);
1913 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1914 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1915 }
1916 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1917 if (k == NULL) return NULL;
1918 return (jclass) JNIHandles::make_local(k->java_mirror());
1919 }
1920 JVM_END
1921
1922 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1923 constantTag tag = cp->tag_at(index);
1924 if (!tag.is_method() && !tag.is_interface_method()) {
1925 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1926 }
1927 int klass_ref = cp->uncached_klass_ref_index_at(index);
1928 Klass* k_o;
1929 if (force_resolution) {
1930 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1931 } else {
1932 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1933 if (k_o == NULL) return NULL;
1934 }
1935 instanceKlassHandle k(THREAD, k_o);
1936 Symbol* name = cp->uncached_name_ref_at(index);
1937 Symbol* sig = cp->uncached_signature_ref_at(index);
1938 methodHandle m (THREAD, k->find_method(name, sig));
1939 if (m.is_null()) {
1940 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1941 }
1942 oop method;
1943 if (!m->is_initializer() || m->is_static()) {
1944 method = Reflection::new_method(m, true, CHECK_NULL);
1945 } else {
1946 method = Reflection::new_constructor(m, CHECK_NULL);
1947 }
1948 return JNIHandles::make_local(method);
1949 }
1950
1951 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1952 {
1953 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1954 JvmtiVMObjectAllocEventCollector oam;
1955 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1956 bounds_check(cp, index, CHECK_NULL);
1957 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1958 return res;
1959 }
1960 JVM_END
1961
1962 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1963 {
1964 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1965 JvmtiVMObjectAllocEventCollector oam;
1966 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1967 bounds_check(cp, index, CHECK_NULL);
1968 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1969 return res;
1970 }
1971 JVM_END
1972
1973 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1974 constantTag tag = cp->tag_at(index);
1975 if (!tag.is_field()) {
1976 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1977 }
1978 int klass_ref = cp->uncached_klass_ref_index_at(index);
1979 Klass* k_o;
1980 if (force_resolution) {
1981 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1982 } else {
1983 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1984 if (k_o == NULL) return NULL;
1985 }
1986 instanceKlassHandle k(THREAD, k_o);
1987 Symbol* name = cp->uncached_name_ref_at(index);
1988 Symbol* sig = cp->uncached_signature_ref_at(index);
1989 fieldDescriptor fd;
1990 Klass* target_klass = k->find_field(name, sig, &fd);
1991 if (target_klass == NULL) {
1992 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1993 }
1994 oop field = Reflection::new_field(&fd, CHECK_NULL);
1995 return JNIHandles::make_local(field);
1996 }
1997
1998 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1999 {
2000 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2001 JvmtiVMObjectAllocEventCollector oam;
2002 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2003 bounds_check(cp, index, CHECK_NULL);
2004 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2005 return res;
2006 }
2007 JVM_END
2008
2009 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2010 {
2011 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2012 JvmtiVMObjectAllocEventCollector oam;
2013 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2014 bounds_check(cp, index, CHECK_NULL);
2015 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2016 return res;
2017 }
2018 JVM_END
2019
2020 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2021 {
2022 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2023 JvmtiVMObjectAllocEventCollector oam;
2024 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2025 bounds_check(cp, index, CHECK_NULL);
2026 constantTag tag = cp->tag_at(index);
2027 if (!tag.is_field_or_method()) {
2028 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2029 }
2030 int klass_ref = cp->uncached_klass_ref_index_at(index);
2031 Symbol* klass_name = cp->klass_name_at(klass_ref);
2032 Symbol* member_name = cp->uncached_name_ref_at(index);
2033 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2034 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2035 objArrayHandle dest(THREAD, dest_o);
2036 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2037 dest->obj_at_put(0, str());
2038 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2039 dest->obj_at_put(1, str());
2040 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2041 dest->obj_at_put(2, str());
2042 return (jobjectArray) JNIHandles::make_local(dest());
2043 }
2044 JVM_END
2045
2046 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2047 {
2048 JVMWrapper("JVM_ConstantPoolGetIntAt");
2049 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2050 bounds_check(cp, index, CHECK_0);
2051 constantTag tag = cp->tag_at(index);
2052 if (!tag.is_int()) {
2053 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2054 }
2055 return cp->int_at(index);
2056 }
2057 JVM_END
2058
2059 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2060 {
2061 JVMWrapper("JVM_ConstantPoolGetLongAt");
2062 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2063 bounds_check(cp, index, CHECK_(0L));
2064 constantTag tag = cp->tag_at(index);
2065 if (!tag.is_long()) {
2066 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2067 }
2068 return cp->long_at(index);
2069 }
2070 JVM_END
2071
2072 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2073 {
2074 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2075 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2076 bounds_check(cp, index, CHECK_(0.0f));
2077 constantTag tag = cp->tag_at(index);
2078 if (!tag.is_float()) {
2079 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2080 }
2081 return cp->float_at(index);
2082 }
2083 JVM_END
2084
2085 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2086 {
2087 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2088 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2089 bounds_check(cp, index, CHECK_(0.0));
2090 constantTag tag = cp->tag_at(index);
2091 if (!tag.is_double()) {
2092 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2093 }
2094 return cp->double_at(index);
2095 }
2096 JVM_END
2097
2098 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2099 {
2100 JVMWrapper("JVM_ConstantPoolGetStringAt");
2101 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2102 bounds_check(cp, index, CHECK_NULL);
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_string()) {
2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 oop str = cp->string_at(index, CHECK_NULL);
2108 return (jstring) JNIHandles::make_local(str);
2109 }
2110 JVM_END
2111
2112 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2113 {
2114 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2115 JvmtiVMObjectAllocEventCollector oam;
2116 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2117 bounds_check(cp, index, CHECK_NULL);
2118 constantTag tag = cp->tag_at(index);
2119 if (!tag.is_symbol()) {
2120 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2121 }
2122 Symbol* sym = cp->symbol_at(index);
2123 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2124 return (jstring) JNIHandles::make_local(str());
2125 }
2126 JVM_END
2127
2128
2129 // Assertion support. //////////////////////////////////////////////////////////
2130
2131 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2132 JVMWrapper("JVM_DesiredAssertionStatus");
2133 assert(cls != NULL, "bad class");
2134
2135 oop r = JNIHandles::resolve(cls);
2136 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2137 if (java_lang_Class::is_primitive(r)) return false;
2138
2139 Klass* k = java_lang_Class::as_Klass(r);
2140 assert(k->oop_is_instance(), "must be an instance klass");
2141 if (! k->oop_is_instance()) return false;
2142
2143 ResourceMark rm(THREAD);
2144 const char* name = k->name()->as_C_string();
2145 bool system_class = k->class_loader() == NULL;
2146 return JavaAssertions::enabled(name, system_class);
2147
2148 JVM_END
2149
2150
2151 // Return a new AssertionStatusDirectives object with the fields filled in with
2152 // command-line assertion arguments (i.e., -ea, -da).
2153 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2154 JVMWrapper("JVM_AssertionStatusDirectives");
2155 JvmtiVMObjectAllocEventCollector oam;
2156 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2157 return JNIHandles::make_local(env, asd);
2158 JVM_END
2159
2160 // Verification ////////////////////////////////////////////////////////////////////////////////
2161
2162 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2163
2164 // RedefineClasses support: bug 6214132 caused verification to fail.
2165 // All functions from this section should call the jvmtiThreadSate function:
2166 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2167 // The function returns a Klass* of the _scratch_class if the verifier
2168 // was invoked in the middle of the class redefinition.
2169 // Otherwise it returns its argument value which is the _the_class Klass*.
2170 // Please, refer to the description in the jvmtiThreadSate.hpp.
2171
2172 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2173 JVMWrapper("JVM_GetClassNameUTF");
2174 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2175 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2176 return k->name()->as_utf8();
2177 JVM_END
2178
2179
2180 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2181 JVMWrapper("JVM_GetClassCPTypes");
2182 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2183 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2184 // types will have length zero if this is not an InstanceKlass
2185 // (length is determined by call to JVM_GetClassCPEntriesCount)
2186 if (k->oop_is_instance()) {
2187 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2188 for (int index = cp->length() - 1; index >= 0; index--) {
2189 constantTag tag = cp->tag_at(index);
2190 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2191 }
2192 }
2193 JVM_END
2194
2195
2196 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2197 JVMWrapper("JVM_GetClassCPEntriesCount");
2198 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2199 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2200 if (!k->oop_is_instance())
2201 return 0;
2202 return InstanceKlass::cast(k)->constants()->length();
2203 JVM_END
2204
2205
2206 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2207 JVMWrapper("JVM_GetClassFieldsCount");
2208 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2209 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2210 if (!k->oop_is_instance())
2211 return 0;
2212 return InstanceKlass::cast(k)->java_fields_count();
2213 JVM_END
2214
2215
2216 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2217 JVMWrapper("JVM_GetClassMethodsCount");
2218 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2219 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2220 if (!k->oop_is_instance())
2221 return 0;
2222 return InstanceKlass::cast(k)->methods()->length();
2223 JVM_END
2224
2225
2226 // The following methods, used for the verifier, are never called with
2227 // array klasses, so a direct cast to InstanceKlass is safe.
2228 // Typically, these methods are called in a loop with bounds determined
2229 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2230 // zero for arrays.
2231 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2232 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2233 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2234 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2235 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2236 int length = method->checked_exceptions_length();
2237 if (length > 0) {
2238 CheckedExceptionElement* table= method->checked_exceptions_start();
2239 for (int i = 0; i < length; i++) {
2240 exceptions[i] = table[i].class_cp_index;
2241 }
2242 }
2243 JVM_END
2244
2245
2246 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2247 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2248 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2249 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2250 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2251 return method->checked_exceptions_length();
2252 JVM_END
2253
2254
2255 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2256 JVMWrapper("JVM_GetMethodIxByteCode");
2257 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2258 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2259 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2260 memcpy(code, method->code_base(), method->code_size());
2261 JVM_END
2262
2263
2264 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2265 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2266 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2267 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2268 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2269 return method->code_size();
2270 JVM_END
2271
2272
2273 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2274 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2275 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2276 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2277 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2278 ExceptionTable extable(method);
2279 entry->start_pc = extable.start_pc(entry_index);
2280 entry->end_pc = extable.end_pc(entry_index);
2281 entry->handler_pc = extable.handler_pc(entry_index);
2282 entry->catchType = extable.catch_type_index(entry_index);
2283 JVM_END
2284
2285
2286 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2287 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2288 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2289 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2290 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2291 return method->exception_table_length();
2292 JVM_END
2293
2294
2295 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2296 JVMWrapper("JVM_GetMethodIxModifiers");
2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2299 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2300 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2301 JVM_END
2302
2303
2304 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2305 JVMWrapper("JVM_GetFieldIxModifiers");
2306 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2307 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2308 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2309 JVM_END
2310
2311
2312 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2313 JVMWrapper("JVM_GetMethodIxLocalsCount");
2314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2315 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2316 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2317 return method->max_locals();
2318 JVM_END
2319
2320
2321 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2322 JVMWrapper("JVM_GetMethodIxArgsSize");
2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2326 return method->size_of_parameters();
2327 JVM_END
2328
2329
2330 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2331 JVMWrapper("JVM_GetMethodIxMaxStack");
2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2334 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2335 return method->verifier_max_stack();
2336 JVM_END
2337
2338
2339 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2340 JVMWrapper("JVM_IsConstructorIx");
2341 ResourceMark rm(THREAD);
2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2345 return method->name() == vmSymbols::object_initializer_name();
2346 JVM_END
2347
2348
2349 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2350 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2351 ResourceMark rm(THREAD);
2352 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2353 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2354 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2355 return method->is_overpass();
2356 JVM_END
2357
2358 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2359 JVMWrapper("JVM_GetMethodIxIxUTF");
2360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2361 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2362 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2363 return method->name()->as_utf8();
2364 JVM_END
2365
2366
2367 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2368 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2369 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2370 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2371 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2372 return method->signature()->as_utf8();
2373 JVM_END
2374
2375 /**
2376 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2377 * read entries in the constant pool. Since the old verifier always
2378 * works on a copy of the code, it will not see any rewriting that
2379 * may possibly occur in the middle of verification. So it is important
2380 * that nothing it calls tries to use the cpCache instead of the raw
2381 * constant pool, so we must use cp->uncached_x methods when appropriate.
2382 */
2383 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2384 JVMWrapper("JVM_GetCPFieldNameUTF");
2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2387 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2388 switch (cp->tag_at(cp_index).value()) {
2389 case JVM_CONSTANT_Fieldref:
2390 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2391 default:
2392 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2393 }
2394 ShouldNotReachHere();
2395 return NULL;
2396 JVM_END
2397
2398
2399 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2400 JVMWrapper("JVM_GetCPMethodNameUTF");
2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2404 switch (cp->tag_at(cp_index).value()) {
2405 case JVM_CONSTANT_InterfaceMethodref:
2406 case JVM_CONSTANT_Methodref:
2407 case JVM_CONSTANT_NameAndType: // for invokedynamic
2408 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2409 default:
2410 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2411 }
2412 ShouldNotReachHere();
2413 return NULL;
2414 JVM_END
2415
2416
2417 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2418 JVMWrapper("JVM_GetCPMethodSignatureUTF");
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_InterfaceMethodref:
2424 case JVM_CONSTANT_Methodref:
2425 case JVM_CONSTANT_NameAndType: // for invokedynamic
2426 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2427 default:
2428 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2429 }
2430 ShouldNotReachHere();
2431 return NULL;
2432 JVM_END
2433
2434
2435 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2436 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2438 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2439 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2440 switch (cp->tag_at(cp_index).value()) {
2441 case JVM_CONSTANT_Fieldref:
2442 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2443 default:
2444 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2445 }
2446 ShouldNotReachHere();
2447 return NULL;
2448 JVM_END
2449
2450
2451 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2452 JVMWrapper("JVM_GetCPClassNameUTF");
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 Symbol* classname = cp->klass_name_at(cp_index);
2457 return classname->as_utf8();
2458 JVM_END
2459
2460
2461 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2462 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2466 switch (cp->tag_at(cp_index).value()) {
2467 case JVM_CONSTANT_Fieldref: {
2468 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2469 Symbol* classname = cp->klass_name_at(class_index);
2470 return classname->as_utf8();
2471 }
2472 default:
2473 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2474 }
2475 ShouldNotReachHere();
2476 return NULL;
2477 JVM_END
2478
2479
2480 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2481 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2484 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2485 switch (cp->tag_at(cp_index).value()) {
2486 case JVM_CONSTANT_Methodref:
2487 case JVM_CONSTANT_InterfaceMethodref: {
2488 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2489 Symbol* classname = cp->klass_name_at(class_index);
2490 return classname->as_utf8();
2491 }
2492 default:
2493 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2494 }
2495 ShouldNotReachHere();
2496 return NULL;
2497 JVM_END
2498
2499
2500 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2501 JVMWrapper("JVM_GetCPFieldModifiers");
2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2506 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2507 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2508 switch (cp->tag_at(cp_index).value()) {
2509 case JVM_CONSTANT_Fieldref: {
2510 Symbol* name = cp->uncached_name_ref_at(cp_index);
2511 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2512 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2513 if (fs.name() == name && fs.signature() == signature) {
2514 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2515 }
2516 }
2517 return -1;
2518 }
2519 default:
2520 fatal("JVM_GetCPFieldModifiers: illegal constant");
2521 }
2522 ShouldNotReachHere();
2523 return 0;
2524 JVM_END
2525
2526
2527 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2528 JVMWrapper("JVM_GetCPMethodModifiers");
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2531 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2532 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 switch (cp->tag_at(cp_index).value()) {
2535 case JVM_CONSTANT_Methodref:
2536 case JVM_CONSTANT_InterfaceMethodref: {
2537 Symbol* name = cp->uncached_name_ref_at(cp_index);
2538 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2539 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2540 int methods_count = methods->length();
2541 for (int i = 0; i < methods_count; i++) {
2542 Method* method = methods->at(i);
2543 if (method->name() == name && method->signature() == signature) {
2544 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2545 }
2546 }
2547 return -1;
2548 }
2549 default:
2550 fatal("JVM_GetCPMethodModifiers: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return 0;
2554 JVM_END
2555
2556
2557 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2558
2559 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2560 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2561 JVM_END
2562
2563
2564 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2565 JVMWrapper("JVM_IsSameClassPackage");
2566 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2567 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2568 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2569 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2570 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2571 JVM_END
2572
2573 // Printing support //////////////////////////////////////////////////
2574 extern "C" {
2575
2576 ATTRIBUTE_PRINTF(3, 0)
2577 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2578 // see bug 4399518, 4417214
2579 if ((intptr_t)count <= 0) return -1;
2580
2581 int result = vsnprintf(str, count, fmt, args);
2582 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2583 // characters which would have been written had the buffer been large
2584 // enough; on Windows, it returns -1. We handle both cases here and
2585 // always return -1, and perform null termination.
2586 if ((result > 0 && (size_t)result >= count) || result == -1) {
2587 str[count - 1] = '\0';
2588 result = -1;
2589 }
2590
2591 return result;
2592 }
2593
2594 ATTRIBUTE_PRINTF(3, 0)
2595 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2596 va_list args;
2597 int len;
2598 va_start(args, fmt);
2599 len = jio_vsnprintf(str, count, fmt, args);
2600 va_end(args);
2601 return len;
2602 }
2603
2604 ATTRIBUTE_PRINTF(2,3)
2605 int jio_fprintf(FILE* f, const char *fmt, ...) {
2606 int len;
2607 va_list args;
2608 va_start(args, fmt);
2609 len = jio_vfprintf(f, fmt, args);
2610 va_end(args);
2611 return len;
2612 }
2613
2614 ATTRIBUTE_PRINTF(2, 0)
2615 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2616 if (Arguments::vfprintf_hook() != NULL) {
2617 return Arguments::vfprintf_hook()(f, fmt, args);
2618 } else {
2619 return vfprintf(f, fmt, args);
2620 }
2621 }
2622
2623 ATTRIBUTE_PRINTF(1, 2)
2624 JNIEXPORT int jio_printf(const char *fmt, ...) {
2625 int len;
2626 va_list args;
2627 va_start(args, fmt);
2628 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2629 va_end(args);
2630 return len;
2631 }
2632
2633
2634 // HotSpot specific jio method
2635 void jio_print(const char* s) {
2636 // Try to make this function as atomic as possible.
2637 if (Arguments::vfprintf_hook() != NULL) {
2638 jio_fprintf(defaultStream::output_stream(), "%s", s);
2639 } else {
2640 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2641 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2642 }
2643 }
2644
2645 } // Extern C
2646
2647 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2648
2649 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2650 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2651 // OSThread objects. The exception to this rule is when the target object is the thread
2652 // doing the operation, in which case we know that the thread won't exit until the
2653 // operation is done (all exits being voluntary). There are a few cases where it is
2654 // rather silly to do operations on yourself, like resuming yourself or asking whether
2655 // you are alive. While these can still happen, they are not subject to deadlocks if
2656 // the lock is held while the operation occurs (this is not the case for suspend, for
2657 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2658 // implementation is local to this file, we always lock Threads_lock for that one.
2659
2660 static void thread_entry(JavaThread* thread, TRAPS) {
2661 HandleMark hm(THREAD);
2662 Handle obj(THREAD, thread->threadObj());
2663 JavaValue result(T_VOID);
2664 JavaCalls::call_virtual(&result,
2665 obj,
2666 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2667 vmSymbols::run_method_name(),
2668 vmSymbols::void_method_signature(),
2669 THREAD);
2670 }
2671
2672
2673 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2674 JVMWrapper("JVM_StartThread");
2675 JavaThread *native_thread = NULL;
2676
2677 // We cannot hold the Threads_lock when we throw an exception,
2678 // due to rank ordering issues. Example: we might need to grab the
2679 // Heap_lock while we construct the exception.
2680 bool throw_illegal_thread_state = false;
2681
2682 // We must release the Threads_lock before we can post a jvmti event
2683 // in Thread::start.
2684 {
2685 // Ensure that the C++ Thread and OSThread structures aren't freed before
2686 // we operate.
2687 MutexLocker mu(Threads_lock);
2688
2689 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2690 // re-starting an already started thread, so we should usually find
2691 // that the JavaThread is null. However for a JNI attached thread
2692 // there is a small window between the Thread object being created
2693 // (with its JavaThread set) and the update to its threadStatus, so we
2694 // have to check for this
2695 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2696 throw_illegal_thread_state = true;
2697 } else {
2698 // We could also check the stillborn flag to see if this thread was already stopped, but
2699 // for historical reasons we let the thread detect that itself when it starts running
2700
2701 jlong size =
2702 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2703 // Allocate the C++ Thread structure and create the native thread. The
2704 // stack size retrieved from java is signed, but the constructor takes
2705 // size_t (an unsigned type), so avoid passing negative values which would
2706 // result in really large stacks.
2707 size_t sz = size > 0 ? (size_t) size : 0;
2708 native_thread = new JavaThread(&thread_entry, sz);
2709
2710 // At this point it may be possible that no osthread was created for the
2711 // JavaThread due to lack of memory. Check for this situation and throw
2712 // an exception if necessary. Eventually we may want to change this so
2713 // that we only grab the lock if the thread was created successfully -
2714 // then we can also do this check and throw the exception in the
2715 // JavaThread constructor.
2716 if (native_thread->osthread() != NULL) {
2717 // Note: the current thread is not being used within "prepare".
2718 native_thread->prepare(jthread);
2719 }
2720 }
2721 }
2722
2723 if (throw_illegal_thread_state) {
2724 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2725 }
2726
2727 assert(native_thread != NULL, "Starting null thread?");
2728
2729 if (native_thread->osthread() == NULL) {
2730 // No one should hold a reference to the 'native_thread'.
2731 delete native_thread;
2732 if (JvmtiExport::should_post_resource_exhausted()) {
2733 JvmtiExport::post_resource_exhausted(
2734 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2735 os::native_thread_creation_failed_msg());
2736 }
2737 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2738 os::native_thread_creation_failed_msg());
2739 }
2740
2741 Thread::start(native_thread);
2742
2743 JVM_END
2744
2745 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2746 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2747 // but is thought to be reliable and simple. In the case, where the receiver is the
2748 // same thread as the sender, no safepoint is needed.
2749 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2750 JVMWrapper("JVM_StopThread");
2751
2752 oop java_throwable = JNIHandles::resolve(throwable);
2753 if (java_throwable == NULL) {
2754 THROW(vmSymbols::java_lang_NullPointerException());
2755 }
2756 oop java_thread = JNIHandles::resolve_non_null(jthread);
2757 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2758 Events::log_exception(JavaThread::current(),
2759 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2760 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2761 // First check if thread is alive
2762 if (receiver != NULL) {
2763 // Check if exception is getting thrown at self (use oop equality, since the
2764 // target object might exit)
2765 if (java_thread == thread->threadObj()) {
2766 THROW_OOP(java_throwable);
2767 } else {
2768 // Enques a VM_Operation to stop all threads and then deliver the exception...
2769 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2770 }
2771 }
2772 else {
2773 // Either:
2774 // - target thread has not been started before being stopped, or
2775 // - target thread already terminated
2776 // We could read the threadStatus to determine which case it is
2777 // but that is overkill as it doesn't matter. We must set the
2778 // stillborn flag for the first case, and if the thread has already
2779 // exited setting this flag has no affect
2780 java_lang_Thread::set_stillborn(java_thread);
2781 }
2782 JVM_END
2783
2784
2785 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2786 JVMWrapper("JVM_IsThreadAlive");
2787
2788 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2789 return java_lang_Thread::is_alive(thread_oop);
2790 JVM_END
2791
2792
2793 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2794 JVMWrapper("JVM_SuspendThread");
2795 oop java_thread = JNIHandles::resolve_non_null(jthread);
2796 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2797
2798 if (receiver != NULL) {
2799 // thread has run and has not exited (still on threads list)
2800
2801 {
2802 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2803 if (receiver->is_external_suspend()) {
2804 // Don't allow nested external suspend requests. We can't return
2805 // an error from this interface so just ignore the problem.
2806 return;
2807 }
2808 if (receiver->is_exiting()) { // thread is in the process of exiting
2809 return;
2810 }
2811 receiver->set_external_suspend();
2812 }
2813
2814 // java_suspend() will catch threads in the process of exiting
2815 // and will ignore them.
2816 receiver->java_suspend();
2817
2818 // It would be nice to have the following assertion in all the
2819 // time, but it is possible for a racing resume request to have
2820 // resumed this thread right after we suspended it. Temporarily
2821 // enable this assertion if you are chasing a different kind of
2822 // bug.
2823 //
2824 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2825 // receiver->is_being_ext_suspended(), "thread is not suspended");
2826 }
2827 JVM_END
2828
2829
2830 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2831 JVMWrapper("JVM_ResumeThread");
2832 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2833 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2834 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2835 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2836 // looks at it.
2837 MutexLocker ml(Threads_lock);
2838 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2839 if (thr != NULL) {
2840 // the thread has run and is not in the process of exiting
2841 thr->java_resume();
2842 }
2843 JVM_END
2844
2845
2846 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2847 JVMWrapper("JVM_SetThreadPriority");
2848 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2849 MutexLocker ml(Threads_lock);
2850 oop java_thread = JNIHandles::resolve_non_null(jthread);
2851 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2852 JavaThread* thr = java_lang_Thread::thread(java_thread);
2853 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2854 Thread::set_priority(thr, (ThreadPriority)prio);
2855 }
2856 JVM_END
2857
2858
2859 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2860 JVMWrapper("JVM_Yield");
2861 if (os::dont_yield()) return;
2862 HOTSPOT_THREAD_YIELD();
2863
2864 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2865 // Critical for similar threading behaviour
2866 if (ConvertYieldToSleep) {
2867 os::sleep(thread, MinSleepInterval, false);
2868 } else {
2869 os::naked_yield();
2870 }
2871 JVM_END
2872
2873
2874 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2875 JVMWrapper("JVM_Sleep");
2876
2877 if (millis < 0) {
2878 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2879 }
2880
2881 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2882 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2883 }
2884
2885 // Save current thread state and restore it at the end of this block.
2886 // And set new thread state to SLEEPING.
2887 JavaThreadSleepState jtss(thread);
2888
2889 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2890
2891 EventThreadSleep event;
2892
2893 if (millis == 0) {
2894 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2895 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2896 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2897 // for SOLARIS
2898 if (ConvertSleepToYield) {
2899 os::naked_yield();
2900 } else {
2901 ThreadState old_state = thread->osthread()->get_state();
2902 thread->osthread()->set_state(SLEEPING);
2903 os::sleep(thread, MinSleepInterval, false);
2904 thread->osthread()->set_state(old_state);
2905 }
2906 } else {
2907 ThreadState old_state = thread->osthread()->get_state();
2908 thread->osthread()->set_state(SLEEPING);
2909 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2910 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2911 // us while we were sleeping. We do not overwrite those.
2912 if (!HAS_PENDING_EXCEPTION) {
2913 if (event.should_commit()) {
2914 event.set_time(millis);
2915 event.commit();
2916 }
2917 HOTSPOT_THREAD_SLEEP_END(1);
2918
2919 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2920 // to properly restore the thread state. That's likely wrong.
2921 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2922 }
2923 }
2924 thread->osthread()->set_state(old_state);
2925 }
2926 if (event.should_commit()) {
2927 event.set_time(millis);
2928 event.commit();
2929 }
2930 HOTSPOT_THREAD_SLEEP_END(0);
2931 JVM_END
2932
2933 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2934 JVMWrapper("JVM_CurrentThread");
2935 oop jthread = thread->threadObj();
2936 assert (thread != NULL, "no current thread!");
2937 return JNIHandles::make_local(env, jthread);
2938 JVM_END
2939
2940
2941 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2942 JVMWrapper("JVM_CountStackFrames");
2943
2944 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2945 oop java_thread = JNIHandles::resolve_non_null(jthread);
2946 bool throw_illegal_thread_state = false;
2947 int count = 0;
2948
2949 {
2950 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2951 // We need to re-resolve the java_thread, since a GC might have happened during the
2952 // acquire of the lock
2953 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2954
2955 if (thr == NULL) {
2956 // do nothing
2957 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2958 // Check whether this java thread has been suspended already. If not, throws
2959 // IllegalThreadStateException. We defer to throw that exception until
2960 // Threads_lock is released since loading exception class has to leave VM.
2961 // The correct way to test a thread is actually suspended is
2962 // wait_for_ext_suspend_completion(), but we can't call that while holding
2963 // the Threads_lock. The above tests are sufficient for our purposes
2964 // provided the walkability of the stack is stable - which it isn't
2965 // 100% but close enough for most practical purposes.
2966 throw_illegal_thread_state = true;
2967 } else {
2968 // Count all java activation, i.e., number of vframes
2969 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
2970 // Native frames are not counted
2971 if (!vfst.method()->is_native()) count++;
2972 }
2973 }
2974 }
2975
2976 if (throw_illegal_thread_state) {
2977 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
2978 "this thread is not suspended");
2979 }
2980 return count;
2981 JVM_END
2982
2983 // Consider: A better way to implement JVM_Interrupt() is to acquire
2984 // Threads_lock to resolve the jthread into a Thread pointer, fetch
2985 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
2986 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
2987 // outside the critical section. Threads_lock is hot so we want to minimize
2988 // the hold-time. A cleaner interface would be to decompose interrupt into
2989 // two steps. The 1st phase, performed under Threads_lock, would return
2990 // a closure that'd be invoked after Threads_lock was dropped.
2991 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
2992 // admit spurious wakeups.
2993
2994 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2995 JVMWrapper("JVM_Interrupt");
2996
2997 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2998 oop java_thread = JNIHandles::resolve_non_null(jthread);
2999 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3000 // We need to re-resolve the java_thread, since a GC might have happened during the
3001 // acquire of the lock
3002 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3003 if (thr != NULL) {
3004 Thread::interrupt(thr);
3005 }
3006 JVM_END
3007
3008
3009 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3010 JVMWrapper("JVM_IsInterrupted");
3011
3012 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3013 oop java_thread = JNIHandles::resolve_non_null(jthread);
3014 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3015 // We need to re-resolve the java_thread, since a GC might have happened during the
3016 // acquire of the lock
3017 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3018 if (thr == NULL) {
3019 return JNI_FALSE;
3020 } else {
3021 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3022 }
3023 JVM_END
3024
3025
3026 // Return true iff the current thread has locked the object passed in
3027
3028 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3029 JVMWrapper("JVM_HoldsLock");
3030 assert(THREAD->is_Java_thread(), "sanity check");
3031 if (obj == NULL) {
3032 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3033 }
3034 Handle h_obj(THREAD, oopDesc::bs()->write_barrier(JNIHandles::resolve(obj)));
3035 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3036 JVM_END
3037
3038
3039 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3040 JVMWrapper("JVM_DumpAllStacks");
3041 VM_PrintThreads op;
3042 VMThread::execute(&op);
3043 if (JvmtiExport::should_post_data_dump()) {
3044 JvmtiExport::post_data_dump();
3045 }
3046 JVM_END
3047
3048 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3049 JVMWrapper("JVM_SetNativeThreadName");
3050 ResourceMark rm(THREAD);
3051 oop java_thread = JNIHandles::resolve_non_null(jthread);
3052 JavaThread* thr = java_lang_Thread::thread(java_thread);
3053 // Thread naming only supported for the current thread, doesn't work for
3054 // target threads.
3055 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3056 // we don't set the name of an attached thread to avoid stepping
3057 // on other programs
3058 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3059 os::set_native_thread_name(thread_name);
3060 }
3061 JVM_END
3062
3063 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3064
3065 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3066 assert(jthread->is_Java_thread(), "must be a Java thread");
3067 if (jthread->privileged_stack_top() == NULL) return false;
3068 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3069 oop loader = jthread->privileged_stack_top()->class_loader();
3070 if (loader == NULL) return true;
3071 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3072 if (trusted) return true;
3073 }
3074 return false;
3075 }
3076
3077 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3078 JVMWrapper("JVM_CurrentLoadedClass");
3079 ResourceMark rm(THREAD);
3080
3081 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3082 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3083 bool trusted = is_trusted_frame(thread, &vfst);
3084 if (trusted) return NULL;
3085
3086 Method* m = vfst.method();
3087 if (!m->is_native()) {
3088 InstanceKlass* holder = m->method_holder();
3089 oop loader = holder->class_loader();
3090 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3091 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3092 }
3093 }
3094 }
3095 return NULL;
3096 JVM_END
3097
3098
3099 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3100 JVMWrapper("JVM_CurrentClassLoader");
3101 ResourceMark rm(THREAD);
3102
3103 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3104
3105 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3106 bool trusted = is_trusted_frame(thread, &vfst);
3107 if (trusted) return NULL;
3108
3109 Method* m = vfst.method();
3110 if (!m->is_native()) {
3111 InstanceKlass* holder = m->method_holder();
3112 assert(holder->is_klass(), "just checking");
3113 oop loader = holder->class_loader();
3114 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3115 return JNIHandles::make_local(env, loader);
3116 }
3117 }
3118 }
3119 return NULL;
3120 JVM_END
3121
3122
3123 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3124 JVMWrapper("JVM_GetClassContext");
3125 ResourceMark rm(THREAD);
3126 JvmtiVMObjectAllocEventCollector oam;
3127 vframeStream vfst(thread);
3128
3129 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3130 // This must only be called from SecurityManager.getClassContext
3131 Method* m = vfst.method();
3132 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3133 m->name() == vmSymbols::getClassContext_name() &&
3134 m->signature() == vmSymbols::void_class_array_signature())) {
3135 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3136 }
3137 }
3138
3139 // Collect method holders
3140 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3141 for (; !vfst.at_end(); vfst.security_next()) {
3142 Method* m = vfst.method();
3143 // Native frames are not returned
3144 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3145 Klass* holder = m->method_holder();
3146 assert(holder->is_klass(), "just checking");
3147 klass_array->append(holder);
3148 }
3149 }
3150
3151 // Create result array of type [Ljava/lang/Class;
3152 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3153 // Fill in mirrors corresponding to method holders
3154 for (int i = 0; i < klass_array->length(); i++) {
3155 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3156 }
3157
3158 return (jobjectArray) JNIHandles::make_local(env, result);
3159 JVM_END
3160
3161
3162 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3163 JVMWrapper("JVM_ClassDepth");
3164 ResourceMark rm(THREAD);
3165 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3166 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3167
3168 const char* str = java_lang_String::as_utf8_string(class_name_str());
3169 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3170 if (class_name_sym == NULL) {
3171 return -1;
3172 }
3173
3174 int depth = 0;
3175
3176 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3177 if (!vfst.method()->is_native()) {
3178 InstanceKlass* holder = vfst.method()->method_holder();
3179 assert(holder->is_klass(), "just checking");
3180 if (holder->name() == class_name_sym) {
3181 return depth;
3182 }
3183 depth++;
3184 }
3185 }
3186 return -1;
3187 JVM_END
3188
3189
3190 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3191 JVMWrapper("JVM_ClassLoaderDepth");
3192 ResourceMark rm(THREAD);
3193 int depth = 0;
3194 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3195 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3196 bool trusted = is_trusted_frame(thread, &vfst);
3197 if (trusted) return -1;
3198
3199 Method* m = vfst.method();
3200 if (!m->is_native()) {
3201 InstanceKlass* holder = m->method_holder();
3202 assert(holder->is_klass(), "just checking");
3203 oop loader = holder->class_loader();
3204 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3205 return depth;
3206 }
3207 depth++;
3208 }
3209 }
3210 return -1;
3211 JVM_END
3212
3213
3214 // java.lang.Package ////////////////////////////////////////////////////////////////
3215
3216
3217 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3218 JVMWrapper("JVM_GetSystemPackage");
3219 ResourceMark rm(THREAD);
3220 JvmtiVMObjectAllocEventCollector oam;
3221 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3222 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3223 return (jstring) JNIHandles::make_local(result);
3224 JVM_END
3225
3226
3227 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3228 JVMWrapper("JVM_GetSystemPackages");
3229 JvmtiVMObjectAllocEventCollector oam;
3230 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3231 return (jobjectArray) JNIHandles::make_local(result);
3232 JVM_END
3233
3234
3235 // ObjectInputStream ///////////////////////////////////////////////////////////////
3236
3237 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3238 if (current_class == NULL) {
3239 return true;
3240 }
3241 if ((current_class == field_class) || access.is_public()) {
3242 return true;
3243 }
3244
3245 if (access.is_protected()) {
3246 // See if current_class is a subclass of field_class
3247 if (current_class->is_subclass_of(field_class)) {
3248 return true;
3249 }
3250 }
3251
3252 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3253 }
3254
3255 // Return the first non-null class loader up the execution stack, or null
3256 // if only code from the null class loader is on the stack.
3257
3258 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3259 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3260 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3261 oop loader = vfst.method()->method_holder()->class_loader();
3262 if (loader != NULL) {
3263 return JNIHandles::make_local(env, loader);
3264 }
3265 }
3266 return NULL;
3267 JVM_END
3268
3269
3270 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3271
3272
3273 // resolve array handle and check arguments
3274 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3275 if (arr == NULL) {
3276 THROW_0(vmSymbols::java_lang_NullPointerException());
3277 }
3278 oop a = JNIHandles::resolve_non_null(arr);
3279 if (!a->is_array()) {
3280 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3281 } else if (type_array_only && !a->is_typeArray()) {
3282 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3283 }
3284 return arrayOop(a);
3285 }
3286
3287
3288 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3289 JVMWrapper("JVM_GetArrayLength");
3290 arrayOop a = check_array(env, arr, false, CHECK_0);
3291 return a->length();
3292 JVM_END
3293
3294
3295 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3296 JVMWrapper("JVM_Array_Get");
3297 JvmtiVMObjectAllocEventCollector oam;
3298 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3299 jvalue value;
3300 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3301 oop box = Reflection::box(&value, type, CHECK_NULL);
3302 return JNIHandles::make_local(env, box);
3303 JVM_END
3304
3305
3306 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3307 JVMWrapper("JVM_GetPrimitiveArrayElement");
3308 jvalue value;
3309 value.i = 0; // to initialize value before getting used in CHECK
3310 arrayOop a = check_array(env, arr, true, CHECK_(value));
3311 assert(a->is_typeArray(), "just checking");
3312 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3313 BasicType wide_type = (BasicType) wCode;
3314 if (type != wide_type) {
3315 Reflection::widen(&value, type, wide_type, CHECK_(value));
3316 }
3317 return value;
3318 JVM_END
3319
3320
3321 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3322 JVMWrapper("JVM_SetArrayElement");
3323 arrayOop a = check_array(env, arr, false, CHECK);
3324 oop box = JNIHandles::resolve(val);
3325 jvalue value;
3326 value.i = 0; // to initialize value before getting used in CHECK
3327 BasicType value_type;
3328 if (a->is_objArray()) {
3329 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3330 value_type = Reflection::unbox_for_regular_object(box, &value);
3331 } else {
3332 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3333 }
3334 Reflection::array_set(&value, a, index, value_type, CHECK);
3335 JVM_END
3336
3337
3338 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3339 JVMWrapper("JVM_SetPrimitiveArrayElement");
3340 arrayOop a = check_array(env, arr, true, CHECK);
3341 assert(a->is_typeArray(), "just checking");
3342 BasicType value_type = (BasicType) vCode;
3343 Reflection::array_set(&v, a, index, value_type, CHECK);
3344 JVM_END
3345
3346
3347 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3348 JVMWrapper("JVM_NewArray");
3349 JvmtiVMObjectAllocEventCollector oam;
3350 oop element_mirror = JNIHandles::resolve(eltClass);
3351 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3352 return JNIHandles::make_local(env, result);
3353 JVM_END
3354
3355
3356 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3357 JVMWrapper("JVM_NewMultiArray");
3358 JvmtiVMObjectAllocEventCollector oam;
3359 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3360 oop element_mirror = JNIHandles::resolve(eltClass);
3361 assert(dim_array->is_typeArray(), "just checking");
3362 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3363 return JNIHandles::make_local(env, result);
3364 JVM_END
3365
3366
3367 // Library support ///////////////////////////////////////////////////////////////////////////
3368
3369 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3370 //%note jvm_ct
3371 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3372 char ebuf[1024];
3373 void *load_result;
3374 {
3375 ThreadToNativeFromVM ttnfvm(thread);
3376 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3377 }
3378 if (load_result == NULL) {
3379 char msg[1024];
3380 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3381 // Since 'ebuf' may contain a string encoded using
3382 // platform encoding scheme, we need to pass
3383 // Exceptions::unsafe_to_utf8 to the new_exception method
3384 // as the last argument. See bug 6367357.
3385 Handle h_exception =
3386 Exceptions::new_exception(thread,
3387 vmSymbols::java_lang_UnsatisfiedLinkError(),
3388 msg, Exceptions::unsafe_to_utf8);
3389
3390 THROW_HANDLE_0(h_exception);
3391 }
3392 return load_result;
3393 JVM_END
3394
3395
3396 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3397 JVMWrapper("JVM_UnloadLibrary");
3398 os::dll_unload(handle);
3399 JVM_END
3400
3401
3402 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3403 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3404 return os::dll_lookup(handle, name);
3405 JVM_END
3406
3407
3408 // JNI version ///////////////////////////////////////////////////////////////////////////////
3409
3410 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3411 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3412 return Threads::is_supported_jni_version_including_1_1(version);
3413 JVM_END
3414
3415
3416 // String support ///////////////////////////////////////////////////////////////////////////
3417
3418 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3419 JVMWrapper("JVM_InternString");
3420 JvmtiVMObjectAllocEventCollector oam;
3421 if (str == NULL) return NULL;
3422 oop string = JNIHandles::resolve_non_null(str);
3423 oop result = StringTable::intern(string, CHECK_NULL);
3424 return (jstring) JNIHandles::make_local(env, result);
3425 JVM_END
3426
3427
3428 // Raw monitor support //////////////////////////////////////////////////////////////////////
3429
3430 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3431 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3432 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3433 // that only works with java threads.
3434
3435
3436 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3437 VM_Exit::block_if_vm_exited();
3438 JVMWrapper("JVM_RawMonitorCreate");
3439 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3440 }
3441
3442
3443 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3444 VM_Exit::block_if_vm_exited();
3445 JVMWrapper("JVM_RawMonitorDestroy");
3446 delete ((Mutex*) mon);
3447 }
3448
3449
3450 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3451 VM_Exit::block_if_vm_exited();
3452 JVMWrapper("JVM_RawMonitorEnter");
3453 ((Mutex*) mon)->jvm_raw_lock();
3454 return 0;
3455 }
3456
3457
3458 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3459 VM_Exit::block_if_vm_exited();
3460 JVMWrapper("JVM_RawMonitorExit");
3461 ((Mutex*) mon)->jvm_raw_unlock();
3462 }
3463
3464
3465 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3466
3467 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3468 Handle loader, Handle protection_domain,
3469 jboolean throwError, TRAPS) {
3470 // Security Note:
3471 // The Java level wrapper will perform the necessary security check allowing
3472 // us to pass the NULL as the initiating class loader. The VM is responsible for
3473 // the checkPackageAccess relative to the initiating class loader via the
3474 // protection_domain. The protection_domain is passed as NULL by the java code
3475 // if there is no security manager in 3-arg Class.forName().
3476 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3477
3478 KlassHandle klass_handle(THREAD, klass);
3479 // Check if we should initialize the class
3480 if (init && klass_handle->oop_is_instance()) {
3481 klass_handle->initialize(CHECK_NULL);
3482 }
3483 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3484 }
3485
3486
3487 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3488
3489 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3490 JVMWrapper("JVM_InvokeMethod");
3491 Handle method_handle;
3492 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3493 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3494 Handle receiver(THREAD, JNIHandles::resolve(obj));
3495 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3496 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3497 jobject res = JNIHandles::make_local(env, result);
3498 if (JvmtiExport::should_post_vm_object_alloc()) {
3499 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3500 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3501 if (java_lang_Class::is_primitive(ret_type)) {
3502 // Only for primitive type vm allocates memory for java object.
3503 // See box() method.
3504 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3505 }
3506 }
3507 return res;
3508 } else {
3509 THROW_0(vmSymbols::java_lang_StackOverflowError());
3510 }
3511 JVM_END
3512
3513
3514 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3515 JVMWrapper("JVM_NewInstanceFromConstructor");
3516 oop constructor_mirror = JNIHandles::resolve(c);
3517 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3518 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3519 jobject res = JNIHandles::make_local(env, result);
3520 if (JvmtiExport::should_post_vm_object_alloc()) {
3521 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3522 }
3523 return res;
3524 JVM_END
3525
3526 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3527
3528 JVM_LEAF(jboolean, JVM_SupportsCX8())
3529 JVMWrapper("JVM_SupportsCX8");
3530 return VM_Version::supports_cx8();
3531 JVM_END
3532
3533 // Returns an array of all live Thread objects (VM internal JavaThreads,
3534 // jvmti agent threads, and JNI attaching threads are skipped)
3535 // See CR 6404306 regarding JNI attaching threads
3536 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3537 ResourceMark rm(THREAD);
3538 ThreadsListEnumerator tle(THREAD, false, false);
3539 JvmtiVMObjectAllocEventCollector oam;
3540
3541 int num_threads = tle.num_threads();
3542 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3543 objArrayHandle threads_ah(THREAD, r);
3544
3545 for (int i = 0; i < num_threads; i++) {
3546 Handle h = tle.get_threadObj(i);
3547 threads_ah->obj_at_put(i, h());
3548 }
3549
3550 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3551 JVM_END
3552
3553
3554 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3555 // Return StackTraceElement[][], each element is the stack trace of a thread in
3556 // the corresponding entry in the given threads array
3557 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3558 JVMWrapper("JVM_DumpThreads");
3559 JvmtiVMObjectAllocEventCollector oam;
3560
3561 // Check if threads is null
3562 if (threads == NULL) {
3563 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3564 }
3565
3566 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3567 objArrayHandle ah(THREAD, a);
3568 int num_threads = ah->length();
3569 // check if threads is non-empty array
3570 if (num_threads == 0) {
3571 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3572 }
3573
3574 // check if threads is not an array of objects of Thread class
3575 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3576 if (k != SystemDictionary::Thread_klass()) {
3577 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3578 }
3579
3580 ResourceMark rm(THREAD);
3581
3582 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3583 for (int i = 0; i < num_threads; i++) {
3584 oop thread_obj = ah->obj_at(i);
3585 instanceHandle h(THREAD, (instanceOop) thread_obj);
3586 thread_handle_array->append(h);
3587 }
3588
3589 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3590 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3591
3592 JVM_END
3593
3594 // JVM monitoring and management support
3595 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3596 return Management::get_jmm_interface(version);
3597 JVM_END
3598
3599 // com.sun.tools.attach.VirtualMachine agent properties support
3600 //
3601 // Initialize the agent properties with the properties maintained in the VM
3602 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3603 JVMWrapper("JVM_InitAgentProperties");
3604 ResourceMark rm;
3605
3606 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3607
3608 PUTPROP(props, "sun.java.command", Arguments::java_command());
3609 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3610 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3611 return properties;
3612 JVM_END
3613
3614 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3615 {
3616 JVMWrapper("JVM_GetEnclosingMethodInfo");
3617 JvmtiVMObjectAllocEventCollector oam;
3618
3619 if (ofClass == NULL) {
3620 return NULL;
3621 }
3622 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3623 // Special handling for primitive objects
3624 if (java_lang_Class::is_primitive(mirror())) {
3625 return NULL;
3626 }
3627 Klass* k = java_lang_Class::as_Klass(mirror());
3628 if (!k->oop_is_instance()) {
3629 return NULL;
3630 }
3631 instanceKlassHandle ik_h(THREAD, k);
3632 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3633 if (encl_method_class_idx == 0) {
3634 return NULL;
3635 }
3636 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3637 objArrayHandle dest(THREAD, dest_o);
3638 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3639 dest->obj_at_put(0, enc_k->java_mirror());
3640 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3641 if (encl_method_method_idx != 0) {
3642 Symbol* sym = ik_h->constants()->symbol_at(
3643 extract_low_short_from_int(
3644 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3645 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3646 dest->obj_at_put(1, str());
3647 sym = ik_h->constants()->symbol_at(
3648 extract_high_short_from_int(
3649 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3650 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3651 dest->obj_at_put(2, str());
3652 }
3653 return (jobjectArray) JNIHandles::make_local(dest());
3654 }
3655 JVM_END
3656
3657 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3658 {
3659 memset(info, 0, info_size);
3660
3661 info->jvm_version = Abstract_VM_Version::jvm_version();
3662 info->update_version = 0; /* 0 in HotSpot Express VM */
3663 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3664
3665 // when we add a new capability in the jvm_version_info struct, we should also
3666 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3667 // counter defined in runtimeService.cpp.
3668 info->is_attachable = AttachListener::is_attach_supported();
3669 }
3670 JVM_END