1 /*
2 * Copyright (c) 1997, 2014, 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.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "gc_interface/collectedHeap.inline.hpp"
33 #include "interpreter/bytecode.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/fieldStreams.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "oops/method.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/jvmtiThreadState.hpp"
44 #include "prims/nativeLookup.hpp"
45 #include "prims/privilegedStack.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/atomic.inline.hpp"
48 #include "runtime/dtraceJSDT.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/init.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/jfieldIDWorkaround.hpp"
55 #include "runtime/orderAccess.inline.hpp"
56 #include "runtime/os.inline.hpp"
57 #include "runtime/perfData.hpp"
58 #include "runtime/reflection.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/vframe.hpp"
61 #include "runtime/vm_operations.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/management.hpp"
65 #include "services/threadService.hpp"
66 #include "trace/tracing.hpp"
67 #include "utilities/copy.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/dtrace.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/histogram.hpp"
72 #include "utilities/macros.hpp"
73 #include "utilities/top.hpp"
74 #include "utilities/utf8.hpp"
75 #if INCLUDE_CDS
76 #include "classfile/sharedClassUtil.hpp"
77 #include "classfile/systemDictionaryShared.hpp"
78 #endif
79 #ifdef TARGET_OS_FAMILY_linux
80 # include "jvm_linux.h"
81 #endif
82 #ifdef TARGET_OS_FAMILY_solaris
83 # include "jvm_solaris.h"
84 #endif
85 #ifdef TARGET_OS_FAMILY_windows
86 # include "jvm_windows.h"
87 #endif
88 #ifdef TARGET_OS_FAMILY_aix
89 # include "jvm_aix.h"
90 #endif
91 #ifdef TARGET_OS_FAMILY_bsd
92 # include "jvm_bsd.h"
93 #endif
94
95 #include <errno.h>
96
97 /*
98 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
99 such ctors and calls MUST NOT come between an oop declaration/init and its
100 usage because if objects are move this may cause various memory stomps, bus
101 errors and segfaults. Here is a cookbook for causing so called "naked oop
102 failures":
103
104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
105 JVMWrapper("JVM_GetClassDeclaredFields");
106
107 // Object address to be held directly in mirror & not visible to GC
108 oop mirror = JNIHandles::resolve_non_null(ofClass);
109
110 // If this ctor can hit a safepoint, moving objects around, then
111 ComplexConstructor foo;
112
113 // Boom! mirror may point to JUNK instead of the intended object
114 (some dereference of mirror)
115
116 // Here's another call that may block for GC, making mirror stale
117 MutexLocker ml(some_lock);
118
119 // And here's an initializer that can result in a stale oop
120 // all in one step.
121 oop o = call_that_can_throw_exception(TRAPS);
122
123
124 The solution is to keep the oop declaration BELOW the ctor or function
125 call that might cause a GC, do another resolve to reassign the oop, or
126 consider use of a Handle instead of an oop so there is immunity from object
127 motion. But note that the "QUICK" entries below do not have a handlemark
128 and thus can only support use of handles passed in.
129 */
130
131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
132 ResourceMark rm;
133 int line_number = -1;
134 const char * source_file = NULL;
135 const char * trace = "explicit";
136 InstanceKlass* caller = NULL;
137 JavaThread* jthread = JavaThread::current();
138 if (jthread->has_last_Java_frame()) {
139 vframeStream vfst(jthread);
140
141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
146
147 Method* last_caller = NULL;
148
149 while (!vfst.at_end()) {
150 Method* m = vfst.method();
151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
154 break;
155 }
156 last_caller = m;
157 vfst.next();
158 }
159 // if this is called from Class.forName0 and that is called from Class.forName,
160 // then print the caller of Class.forName. If this is Class.loadClass, then print
161 // that caller, otherwise keep quiet since this should be picked up elsewhere.
162 bool found_it = false;
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName0_name()) {
166 vfst.next();
167 if (!vfst.at_end() &&
168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
169 vfst.method()->name() == vmSymbols::forName_name()) {
170 vfst.next();
171 found_it = true;
172 }
173 } else if (last_caller != NULL &&
174 last_caller->method_holder()->name() ==
175 vmSymbols::java_lang_ClassLoader() &&
176 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
177 last_caller->name() == vmSymbols::loadClass_name())) {
178 found_it = true;
179 } else if (!vfst.at_end()) {
180 if (vfst.method()->is_native()) {
181 // JNI call
182 found_it = true;
183 }
184 }
185 if (found_it && !vfst.at_end()) {
186 // found the caller
187 caller = vfst.method()->method_holder();
188 line_number = vfst.method()->line_number_from_bci(vfst.bci());
189 if (line_number == -1) {
190 // show method name if it's a native method
191 trace = vfst.method()->name_and_sig_as_C_string();
192 }
193 Symbol* s = caller->source_file_name();
194 if (s != NULL) {
195 source_file = s->as_C_string();
196 }
197 }
198 }
199 if (caller != NULL) {
200 if (to_class != caller) {
201 const char * from = caller->external_name();
202 const char * to = to_class->external_name();
203 // print in a single call to reduce interleaving between threads
204 if (source_file != NULL) {
205 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
206 } else {
207 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
208 }
209 }
210 }
211 }
212
213 void trace_class_resolution(Klass* to_class) {
214 EXCEPTION_MARK;
215 trace_class_resolution_impl(to_class, THREAD);
216 if (HAS_PENDING_EXCEPTION) {
217 CLEAR_PENDING_EXCEPTION;
218 }
219 }
220
221 // Wrapper to trace JVM functions
222
223 #ifdef ASSERT
224 class JVMTraceWrapper : public StackObj {
225 public:
226 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
227 if (TraceJVMCalls) {
228 va_list ap;
229 va_start(ap, format);
230 tty->print("JVM ");
231 tty->vprint_cr(format, ap);
232 va_end(ap);
233 }
234 }
235 };
236
237 Histogram* JVMHistogram;
238 volatile jint JVMHistogram_lock = 0;
239
240 class JVMHistogramElement : public HistogramElement {
241 public:
242 JVMHistogramElement(const char* name);
243 };
244
245 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
246 _name = elementName;
247 uintx count = 0;
248
249 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
250 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
251 count +=1;
252 if ( (WarnOnStalledSpinLock > 0)
253 && (count % WarnOnStalledSpinLock == 0)) {
254 warning("JVMHistogram_lock seems to be stalled");
255 }
256 }
257 }
258
259 if(JVMHistogram == NULL)
260 JVMHistogram = new Histogram("JVM Call Counts",100);
261
262 JVMHistogram->add_element(this);
263 Atomic::dec(&JVMHistogram_lock);
264 }
265
266 #define JVMCountWrapper(arg) \
267 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
268 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
269
270 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
271 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
272 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
273 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
274 #else
275 #define JVMWrapper(arg1)
276 #define JVMWrapper2(arg1, arg2)
277 #define JVMWrapper3(arg1, arg2, arg3)
278 #define JVMWrapper4(arg1, arg2, arg3, arg4)
279 #endif
280
281
282 // Interface version /////////////////////////////////////////////////////////////////////
283
284
285 JVM_LEAF(jint, JVM_GetInterfaceVersion())
286 return JVM_INTERFACE_VERSION;
287 JVM_END
288
289
290 // java.lang.System //////////////////////////////////////////////////////////////////////
291
292
293 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
294 JVMWrapper("JVM_CurrentTimeMillis");
295 return os::javaTimeMillis();
296 JVM_END
297
298 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
299 JVMWrapper("JVM_NanoTime");
300 return os::javaTimeNanos();
301 JVM_END
302
303
304 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
305 jobject dst, jint dst_pos, jint length))
306 JVMWrapper("JVM_ArrayCopy");
307 // Check if we have null pointers
308 if (src == NULL || dst == NULL) {
309 THROW(vmSymbols::java_lang_NullPointerException());
310 }
311 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
312 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
313 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
314 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
315 // Do copy
316 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
317 JVM_END
318
319
320 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
321 JavaValue r(T_OBJECT);
322 // public synchronized Object put(Object key, Object value);
323 HandleMark hm(THREAD);
324 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
325 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
326 JavaCalls::call_virtual(&r,
327 props,
328 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
329 vmSymbols::put_name(),
330 vmSymbols::object_object_object_signature(),
331 key_str,
332 value_str,
333 THREAD);
334 }
335
336
337 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
338
339
340 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
341 JVMWrapper("JVM_InitProperties");
342 ResourceMark rm;
343
344 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
345
346 // System property list includes both user set via -D option and
347 // jvm system specific properties.
348 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
349 PUTPROP(props, p->key(), p->value());
350 }
351
352 // Convert the -XX:MaxDirectMemorySize= command line flag
353 // to the sun.nio.MaxDirectMemorySize property.
354 // Do this after setting user properties to prevent people
355 // from setting the value with a -D option, as requested.
356 {
357 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
358 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
359 } else {
360 char as_chars[256];
361 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize);
362 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
363 }
364 }
365
366 // JVM monitoring and management support
367 // Add the sun.management.compiler property for the compiler's name
368 {
369 #undef CSIZE
370 #if defined(_LP64) || defined(_WIN64)
371 #define CSIZE "64-Bit "
372 #else
373 #define CSIZE
374 #endif // 64bit
375
376 #ifdef TIERED
377 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
378 #else
379 #if defined(COMPILER1)
380 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
381 #elif defined(COMPILER2)
382 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
383 #else
384 const char* compiler_name = "";
385 #endif // compilers
386 #endif // TIERED
387
388 if (*compiler_name != '\0' &&
389 (Arguments::mode() != Arguments::_int)) {
390 PUTPROP(props, "sun.management.compiler", compiler_name);
391 }
392 }
393
394 return properties;
395 JVM_END
396
397
398 /*
399 * Return the temporary directory that the VM uses for the attach
400 * and perf data files.
401 *
402 * It is important that this directory is well-known and the
403 * same for all VM instances. It cannot be affected by configuration
404 * variables such as java.io.tmpdir.
405 */
406 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
407 JVMWrapper("JVM_GetTemporaryDirectory");
408 HandleMark hm(THREAD);
409 const char* temp_dir = os::get_temp_directory();
410 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
411 return (jstring) JNIHandles::make_local(env, h());
412 JVM_END
413
414
415 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
416
417 extern volatile jint vm_created;
418
419 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
420 before_exit(thread);
421 vm_exit(code);
422 JVM_END
423
424
425 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
426 JVMWrapper("JVM_GC");
427 if (!DisableExplicitGC) {
428 Universe::heap()->collect(GCCause::_java_lang_system_gc);
429 }
430 JVM_END
431
432
433 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
434 JVMWrapper("JVM_MaxObjectInspectionAge");
435 return Universe::heap()->millis_since_last_gc();
436 JVM_END
437
438
439 static inline jlong convert_size_t_to_jlong(size_t val) {
440 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
441 NOT_LP64 (return (jlong)val;)
442 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
443 }
444
445 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
446 JVMWrapper("JVM_TotalMemory");
447 size_t n = Universe::heap()->capacity();
448 return convert_size_t_to_jlong(n);
449 JVM_END
450
451
452 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
453 JVMWrapper("JVM_FreeMemory");
454 CollectedHeap* ch = Universe::heap();
455 size_t n;
456 {
457 MutexLocker x(Heap_lock);
458 n = ch->capacity() - ch->used();
459 }
460 return convert_size_t_to_jlong(n);
461 JVM_END
462
463
464 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
465 JVMWrapper("JVM_MaxMemory");
466 size_t n = Universe::heap()->max_capacity();
467 return convert_size_t_to_jlong(n);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
472 JVMWrapper("JVM_ActiveProcessorCount");
473 return os::active_processor_count();
474 JVM_END
475
476
477
478 // java.lang.Throwable //////////////////////////////////////////////////////
479
480
481 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
482 JVMWrapper("JVM_FillInStackTrace");
483 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
484 java_lang_Throwable::fill_in_stack_trace(exception);
485 JVM_END
486
487
488 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
489 JVMWrapper("JVM_GetStackTraceDepth");
490 oop exception = JNIHandles::resolve(throwable);
491 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
492 JVM_END
493
494
495 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
496 JVMWrapper("JVM_GetStackTraceElement");
497 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
498 oop exception = JNIHandles::resolve(throwable);
499 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
500 return JNIHandles::make_local(env, element);
501 JVM_END
502
503
504 // java.lang.Object ///////////////////////////////////////////////
505
506
507 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
508 JVMWrapper("JVM_IHashCode");
509 // as implemented in the classic virtual machine; return 0 if object is NULL
510 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
511 JVM_END
512
513
514 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
515 JVMWrapper("JVM_MonitorWait");
516 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
517 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
518 if (JvmtiExport::should_post_monitor_wait()) {
519 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
520
521 // The current thread already owns the monitor and it has not yet
522 // been added to the wait queue so the current thread cannot be
523 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
524 // event handler cannot accidentally consume an unpark() meant for
525 // the ParkEvent associated with this ObjectMonitor.
526 }
527 ObjectSynchronizer::wait(obj, ms, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
532 JVMWrapper("JVM_MonitorNotify");
533 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
534 ObjectSynchronizer::notify(obj, CHECK);
535 JVM_END
536
537
538 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
539 JVMWrapper("JVM_MonitorNotifyAll");
540 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
541 ObjectSynchronizer::notifyall(obj, CHECK);
542 JVM_END
543
544
545 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
546 JVMWrapper("JVM_Clone");
547 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
548 const KlassHandle klass (THREAD, obj->klass());
549 JvmtiVMObjectAllocEventCollector oam;
550
551 #ifdef ASSERT
552 // Just checking that the cloneable flag is set correct
553 if (obj->is_array()) {
554 guarantee(klass->is_cloneable(), "all arrays are cloneable");
555 } else {
556 guarantee(obj->is_instance(), "should be instanceOop");
557 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
558 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
559 }
560 #endif
561
562 // Check if class of obj supports the Cloneable interface.
563 // All arrays are considered to be cloneable (See JLS 20.1.5)
564 if (!klass->is_cloneable()) {
565 ResourceMark rm(THREAD);
566 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
567 }
568
569 // Make shallow object copy
570 const int size = obj->size();
571 oop new_obj_oop = NULL;
572 if (obj->is_array()) {
573 const int length = ((arrayOop)obj())->length();
574 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
575 } else {
576 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
577 }
578
579 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
580 // is modifying a reference field in the clonee, a non-oop-atomic copy might
581 // be suspended in the middle of copying the pointer and end up with parts
582 // of two different pointers in the field. Subsequent dereferences will crash.
583 // 4846409: an oop-copy of objects with long or double fields or arrays of same
584 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
585 // of oops. We know objects are aligned on a minimum of an jlong boundary.
586 // The same is true of StubRoutines::object_copy and the various oop_copy
587 // variants, and of the code generated by the inline_native_clone intrinsic.
588 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
589 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
590 (size_t)align_object_size(size) / HeapWordsPerLong);
591 // Clear the header
592 new_obj_oop->init_mark();
593
594 // Store check (mark entire object and let gc sort it out)
595 BarrierSet* bs = Universe::heap()->barrier_set();
596 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
597 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
598
599 Handle new_obj(THREAD, new_obj_oop);
600 // Special handling for MemberNames. Since they contain Method* metadata, they
601 // must be registered so that RedefineClasses can fix metadata contained in them.
602 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
603 java_lang_invoke_MemberName::is_method(new_obj())) {
604 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
605 // MemberName may be unresolved, so doesn't need registration until resolved.
606 if (method != NULL) {
607 methodHandle m(THREAD, method);
608 // This can safepoint and redefine method, so need both new_obj and method
609 // in a handle, for two different reasons. new_obj can move, method can be
610 // deleted if nothing is using it on the stack.
611 m->method_holder()->add_member_name(new_obj());
612 }
613 }
614
615 // Caution: this involves a java upcall, so the clone should be
616 // "gc-robust" by this stage.
617 if (klass->has_finalizer()) {
618 assert(obj->is_instance(), "should be instanceOop");
619 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
620 new_obj = Handle(THREAD, new_obj_oop);
621 }
622
623 return JNIHandles::make_local(env, new_obj());
624 JVM_END
625
626 // java.io.File ///////////////////////////////////////////////////////////////
627
628 JVM_LEAF(char*, JVM_NativePath(char* path))
629 JVMWrapper2("JVM_NativePath (%s)", path);
630 return os::native_path(path);
631 JVM_END
632
633
634 // Misc. class handling ///////////////////////////////////////////////////////////
635
636
637 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
638 JVMWrapper("JVM_GetCallerClass");
639
640 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
641 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
642 // temporarily for existing code to use until a replacement API is defined.
643 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
644 Klass* k = thread->security_get_caller_class(depth);
645 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
646 }
647
648 // Getting the class of the caller frame.
649 //
650 // The call stack at this point looks something like this:
651 //
652 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
653 // [1] [ @CallerSensitive API.method ]
654 // [.] [ (skipped intermediate frames) ]
655 // [n] [ caller ]
656 vframeStream vfst(thread);
657 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
658 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
659 Method* m = vfst.method();
660 assert(m != NULL, "sanity");
661 switch (n) {
662 case 0:
663 // This must only be called from Reflection.getCallerClass
664 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
665 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
666 }
667 // fall-through
668 case 1:
669 // Frame 0 and 1 must be caller sensitive.
670 if (!m->caller_sensitive()) {
671 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
672 }
673 break;
674 default:
675 if (!m->is_ignored_by_security_stack_walk()) {
676 // We have reached the desired frame; return the holder class.
677 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
678 }
679 break;
680 }
681 }
682 return NULL;
683 JVM_END
684
685
686 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
687 JVMWrapper("JVM_FindPrimitiveClass");
688 oop mirror = NULL;
689 BasicType t = name2type(utf);
690 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
691 mirror = Universe::java_mirror(t);
692 }
693 if (mirror == NULL) {
694 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
695 } else {
696 return (jclass) JNIHandles::make_local(env, mirror);
697 }
698 JVM_END
699
700
701 // Returns a class loaded by the bootstrap class loader; or null
702 // if not found. ClassNotFoundException is not thrown.
703 // FindClassFromBootLoader is exported to the launcher for windows.
704 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
705 const char* name))
706 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
707
708 // Java libraries should ensure that name is never null...
709 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
710 // It's impossible to create this class; the name cannot fit
711 // into the constant pool.
712 return NULL;
713 }
714
715 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
716 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
717 if (k == NULL) {
718 return NULL;
719 }
720
721 if (TraceClassResolution) {
722 trace_class_resolution(k);
723 }
724 return (jclass) JNIHandles::make_local(env, k->java_mirror());
725 JVM_END
726
727 // Find a class with this name in this loader, using the caller's protection domain.
728 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
729 jboolean init, jobject loader,
730 jclass caller))
731 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
732 // Java libraries should ensure that name is never null...
733 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
734 // It's impossible to create this class; the name cannot fit
735 // into the constant pool.
736 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
737 }
738
739 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
740
741 oop loader_oop = JNIHandles::resolve(loader);
742 oop from_class = JNIHandles::resolve(caller);
743 oop protection_domain = NULL;
744 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
745 // NPE. Put it in another way, the bootstrap class loader has all permission and
746 // thus no checkPackageAccess equivalence in the VM class loader.
747 // The caller is also passed as NULL by the java code if there is no security
748 // manager to avoid the performance cost of getting the calling class.
749 if (from_class != NULL && loader_oop != NULL) {
750 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
751 }
752
753 Handle h_loader(THREAD, loader_oop);
754 Handle h_prot(THREAD, protection_domain);
755 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
756 h_prot, false, THREAD);
757
758 if (TraceClassResolution && result != NULL) {
759 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
760 }
761 return result;
762 JVM_END
763
764 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
765 jboolean init, jclass from))
766 JVMWrapper2("JVM_FindClassFromClass %s", name);
767 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
768 // It's impossible to create this class; the name cannot fit
769 // into the constant pool.
770 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
771 }
772 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
773 oop from_class_oop = JNIHandles::resolve(from);
774 Klass* from_class = (from_class_oop == NULL)
775 ? (Klass*)NULL
776 : java_lang_Class::as_Klass(from_class_oop);
777 oop class_loader = NULL;
778 oop protection_domain = NULL;
779 if (from_class != NULL) {
780 class_loader = from_class->class_loader();
781 protection_domain = from_class->protection_domain();
782 }
783 Handle h_loader(THREAD, class_loader);
784 Handle h_prot (THREAD, protection_domain);
785 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
786 h_prot, true, thread);
787
788 if (TraceClassResolution && result != NULL) {
789 // this function is generally only used for class loading during verification.
790 ResourceMark rm;
791 oop from_mirror = JNIHandles::resolve_non_null(from);
792 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
793 const char * from_name = from_class->external_name();
794
795 oop mirror = JNIHandles::resolve_non_null(result);
796 Klass* to_class = java_lang_Class::as_Klass(mirror);
797 const char * to = to_class->external_name();
798 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
799 }
800
801 return result;
802 JVM_END
803
804 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
805 if (loader.is_null()) {
806 return;
807 }
808
809 // check whether the current caller thread holds the lock or not.
810 // If not, increment the corresponding counter
811 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
812 ObjectSynchronizer::owner_self) {
813 counter->inc();
814 }
815 }
816
817 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
818 // and JVM_DefineClassWithSourceCond()
819 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
820 jobject loader, const jbyte *buf,
821 jsize len, jobject pd, const char *source,
822 jboolean verify, TRAPS) {
823 if (source == NULL) source = "__JVM_DefineClass__";
824
825 assert(THREAD->is_Java_thread(), "must be a JavaThread");
826 JavaThread* jt = (JavaThread*) THREAD;
827
828 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
829 ClassLoader::perf_define_appclass_selftime(),
830 ClassLoader::perf_define_appclasses(),
831 jt->get_thread_stat()->perf_recursion_counts_addr(),
832 jt->get_thread_stat()->perf_timers_addr(),
833 PerfClassTraceTime::DEFINE_CLASS);
834
835 if (UsePerfData) {
836 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
837 }
838
839 // Since exceptions can be thrown, class initialization can take place
840 // if name is NULL no check for class name in .class stream has to be made.
841 TempNewSymbol class_name = NULL;
842 if (name != NULL) {
843 const int str_len = (int)strlen(name);
844 if (str_len > Symbol::max_length()) {
845 // It's impossible to create this class; the name cannot fit
846 // into the constant pool.
847 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
848 }
849 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
850 }
851
852 ResourceMark rm(THREAD);
853 ClassFileStream st((u1*) buf, len, (char *)source);
854 Handle class_loader (THREAD, JNIHandles::resolve(loader));
855 if (UsePerfData) {
856 is_lock_held_by_thread(class_loader,
857 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
858 THREAD);
859 }
860 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
861 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
862 protection_domain, &st,
863 verify != 0,
864 CHECK_NULL);
865
866 if (TraceClassResolution && k != NULL) {
867 trace_class_resolution(k);
868 }
869
870 return (jclass) JNIHandles::make_local(env, k->java_mirror());
871 }
872
873
874 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
875 JVMWrapper2("JVM_DefineClass %s", name);
876
877 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
878 JVM_END
879
880
881 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
882 JVMWrapper2("JVM_DefineClassWithSource %s", name);
883
884 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
885 JVM_END
886
887 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
888 jobject loader, const jbyte *buf,
889 jsize len, jobject pd,
890 const char *source, jboolean verify))
891 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
892
893 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
894 JVM_END
895
896 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
897 JVMWrapper("JVM_FindLoadedClass");
898 ResourceMark rm(THREAD);
899
900 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
901 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
902
903 const char* str = java_lang_String::as_utf8_string(string());
904 // Sanity check, don't expect null
905 if (str == NULL) return NULL;
906
907 const int str_len = (int)strlen(str);
908 if (str_len > Symbol::max_length()) {
909 // It's impossible to create this class; the name cannot fit
910 // into the constant pool.
911 return NULL;
912 }
913 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
914
915 // Security Note:
916 // The Java level wrapper will perform the necessary security check allowing
917 // us to pass the NULL as the initiating class loader.
918 Handle h_loader(THREAD, JNIHandles::resolve(loader));
919 if (UsePerfData) {
920 is_lock_held_by_thread(h_loader,
921 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
922 THREAD);
923 }
924
925 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
926 h_loader,
927 Handle(),
928 CHECK_NULL);
929 #if INCLUDE_CDS
930 if (k == NULL) {
931 // If the class is not already loaded, try to see if it's in the shared
932 // archive for the current classloader (h_loader).
933 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
934 klass_name, h_loader, CHECK_NULL);
935 k = ik();
936 }
937 #endif
938 return (k == NULL) ? NULL :
939 (jclass) JNIHandles::make_local(env, k->java_mirror());
940 JVM_END
941
942
943 // Reflection support //////////////////////////////////////////////////////////////////////////////
944
945 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
946 assert (cls != NULL, "illegal class");
947 JVMWrapper("JVM_GetClassName");
948 JvmtiVMObjectAllocEventCollector oam;
949 ResourceMark rm(THREAD);
950 const char* name;
951 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
952 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
953 } else {
954 // Consider caching interned string in Klass
955 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
956 assert(k->is_klass(), "just checking");
957 name = k->external_name();
958 }
959 oop result = StringTable::intern((char*) name, CHECK_NULL);
960 return (jstring) JNIHandles::make_local(env, result);
961 JVM_END
962
963
964 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
965 JVMWrapper("JVM_GetClassInterfaces");
966 JvmtiVMObjectAllocEventCollector oam;
967 oop mirror = JNIHandles::resolve_non_null(cls);
968
969 // Special handling for primitive objects
970 if (java_lang_Class::is_primitive(mirror)) {
971 // Primitive objects does not have any interfaces
972 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
973 return (jobjectArray) JNIHandles::make_local(env, r);
974 }
975
976 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
977 // Figure size of result array
978 int size;
979 if (klass->oop_is_instance()) {
980 size = InstanceKlass::cast(klass())->local_interfaces()->length();
981 } else {
982 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
983 size = 2;
984 }
985
986 // Allocate result array
987 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
988 objArrayHandle result (THREAD, r);
989 // Fill in result
990 if (klass->oop_is_instance()) {
991 // Regular instance klass, fill in all local interfaces
992 for (int index = 0; index < size; index++) {
993 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
994 result->obj_at_put(index, k->java_mirror());
995 }
996 } else {
997 // All arrays implement java.lang.Cloneable and java.io.Serializable
998 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
999 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1000 }
1001 return (jobjectArray) JNIHandles::make_local(env, result());
1002 JVM_END
1003
1004
1005 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1006 JVMWrapper("JVM_IsInterface");
1007 oop mirror = JNIHandles::resolve_non_null(cls);
1008 if (java_lang_Class::is_primitive(mirror)) {
1009 return JNI_FALSE;
1010 }
1011 Klass* k = java_lang_Class::as_Klass(mirror);
1012 jboolean result = k->is_interface();
1013 assert(!result || k->oop_is_instance(),
1014 "all interfaces are instance types");
1015 // The compiler intrinsic for isInterface tests the
1016 // Klass::_access_flags bits in the same way.
1017 return result;
1018 JVM_END
1019
1020
1021 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1022 JVMWrapper("JVM_GetClassSigners");
1023 JvmtiVMObjectAllocEventCollector oam;
1024 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1025 // There are no signers for primitive types
1026 return NULL;
1027 }
1028
1029 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1030
1031 // If there are no signers set in the class, or if the class
1032 // is an array, return NULL.
1033 if (signers == NULL) return NULL;
1034
1035 // copy of the signers array
1036 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1037 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1038 for (int index = 0; index < signers->length(); index++) {
1039 signers_copy->obj_at_put(index, signers->obj_at(index));
1040 }
1041
1042 // return the copy
1043 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1044 JVM_END
1045
1046
1047 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1048 JVMWrapper("JVM_SetClassSigners");
1049 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1050 // This call is ignored for primitive types and arrays.
1051 // Signers are only set once, ClassLoader.java, and thus shouldn't
1052 // be called with an array. Only the bootstrap loader creates arrays.
1053 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1054 if (k->oop_is_instance()) {
1055 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1056 }
1057 }
1058 JVM_END
1059
1060
1061 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1062 JVMWrapper("JVM_GetProtectionDomain");
1063 if (JNIHandles::resolve(cls) == NULL) {
1064 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1065 }
1066
1067 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1068 // Primitive types does not have a protection domain.
1069 return NULL;
1070 }
1071
1072 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1073 return (jobject) JNIHandles::make_local(env, pd);
1074 JVM_END
1075
1076
1077 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1078 // If there is a security manager and protection domain, check the access
1079 // in the protection domain, otherwise it is authorized.
1080 if (java_lang_System::has_security_manager()) {
1081
1082 // For bootstrapping, if pd implies method isn't in the JDK, allow
1083 // this context to revert to older behavior.
1084 // In this case the isAuthorized field in AccessControlContext is also not
1085 // present.
1086 if (Universe::protection_domain_implies_method() == NULL) {
1087 return true;
1088 }
1089
1090 // Whitelist certain access control contexts
1091 if (java_security_AccessControlContext::is_authorized(context)) {
1092 return true;
1093 }
1094
1095 oop prot = klass->protection_domain();
1096 if (prot != NULL) {
1097 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1098 // in the new wrapper.
1099 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1100 Handle h_prot(THREAD, prot);
1101 JavaValue result(T_BOOLEAN);
1102 JavaCallArguments args(h_prot);
1103 JavaCalls::call(&result, m, &args, CHECK_false);
1104 return (result.get_jboolean() != 0);
1105 }
1106 }
1107 return true;
1108 }
1109
1110 // Create an AccessControlContext with a protection domain with null codesource
1111 // and null permissions - which gives no permissions.
1112 oop create_dummy_access_control_context(TRAPS) {
1113 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1114 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1115 // Call constructor ProtectionDomain(null, null);
1116 JavaValue result(T_VOID);
1117 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1118 vmSymbols::object_initializer_name(),
1119 vmSymbols::codesource_permissioncollection_signature(),
1120 Handle(), Handle(), CHECK_NULL);
1121
1122 // new ProtectionDomain[] {pd};
1123 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1124 context->obj_at_put(0, obj());
1125
1126 // new AccessControlContext(new ProtectionDomain[] {pd})
1127 objArrayHandle h_context(THREAD, context);
1128 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1129 return acc;
1130 }
1131
1132 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1133 JVMWrapper("JVM_DoPrivileged");
1134
1135 if (action == NULL) {
1136 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1137 }
1138
1139 // Compute the frame initiating the do privileged operation and setup the privileged stack
1140 vframeStream vfst(thread);
1141 vfst.security_get_caller_frame(1);
1142
1143 if (vfst.at_end()) {
1144 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1145 }
1146
1147 Method* method = vfst.method();
1148 instanceKlassHandle klass (THREAD, method->method_holder());
1149
1150 // Check that action object understands "Object run()"
1151 Handle h_context;
1152 if (context != NULL) {
1153 h_context = Handle(THREAD, JNIHandles::resolve(context));
1154 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1155 if (!authorized) {
1156 // Create an unprivileged access control object and call it's run function
1157 // instead.
1158 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1159 h_context = Handle(THREAD, noprivs);
1160 }
1161 }
1162
1163 // Check that action object understands "Object run()"
1164 Handle object (THREAD, JNIHandles::resolve(action));
1165
1166 // get run() method
1167 Method* m_oop = object->klass()->uncached_lookup_method(
1168 vmSymbols::run_method_name(),
1169 vmSymbols::void_object_signature(),
1170 Klass::normal);
1171 methodHandle m (THREAD, m_oop);
1172 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1173 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1174 }
1175
1176 // Stack allocated list of privileged stack elements
1177 PrivilegedElement pi;
1178 if (!vfst.at_end()) {
1179 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1180 thread->set_privileged_stack_top(&pi);
1181 }
1182
1183
1184 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1185 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1186 Handle pending_exception;
1187 JavaValue result(T_OBJECT);
1188 JavaCallArguments args(object);
1189 JavaCalls::call(&result, m, &args, THREAD);
1190
1191 // done with action, remove ourselves from the list
1192 if (!vfst.at_end()) {
1193 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1194 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1195 }
1196
1197 if (HAS_PENDING_EXCEPTION) {
1198 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1199 CLEAR_PENDING_EXCEPTION;
1200 // JVMTI has already reported the pending exception
1201 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1202 if (THREAD->is_Java_thread()) {
1203 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1204 }
1205 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1206 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1207 // Throw a java.security.PrivilegedActionException(Exception e) exception
1208 JavaCallArguments args(pending_exception);
1209 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1210 vmSymbols::exception_void_signature(),
1211 &args);
1212 }
1213 }
1214
1215 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1216 return JNIHandles::make_local(env, (oop) result.get_jobject());
1217 JVM_END
1218
1219
1220 // Returns the inherited_access_control_context field of the running thread.
1221 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1222 JVMWrapper("JVM_GetInheritedAccessControlContext");
1223 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1224 return JNIHandles::make_local(env, result);
1225 JVM_END
1226
1227 class RegisterArrayForGC {
1228 private:
1229 JavaThread *_thread;
1230 public:
1231 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1232 _thread = thread;
1233 _thread->register_array_for_gc(array);
1234 }
1235
1236 ~RegisterArrayForGC() {
1237 _thread->register_array_for_gc(NULL);
1238 }
1239 };
1240
1241
1242 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1243 JVMWrapper("JVM_GetStackAccessControlContext");
1244 if (!UsePrivilegedStack) return NULL;
1245
1246 ResourceMark rm(THREAD);
1247 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1248 JvmtiVMObjectAllocEventCollector oam;
1249
1250 // count the protection domains on the execution stack. We collapse
1251 // duplicate consecutive protection domains into a single one, as
1252 // well as stopping when we hit a privileged frame.
1253
1254 // Use vframeStream to iterate through Java frames
1255 vframeStream vfst(thread);
1256
1257 oop previous_protection_domain = NULL;
1258 Handle privileged_context(thread, NULL);
1259 bool is_privileged = false;
1260 oop protection_domain = NULL;
1261
1262 for(; !vfst.at_end(); vfst.next()) {
1263 // get method of frame
1264 Method* method = vfst.method();
1265 intptr_t* frame_id = vfst.frame_id();
1266
1267 // check the privileged frames to see if we have a match
1268 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1269 // this frame is privileged
1270 is_privileged = true;
1271 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1272 protection_domain = thread->privileged_stack_top()->protection_domain();
1273 } else {
1274 protection_domain = method->method_holder()->protection_domain();
1275 }
1276
1277 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1278 local_array->push(protection_domain);
1279 previous_protection_domain = protection_domain;
1280 }
1281
1282 if (is_privileged) break;
1283 }
1284
1285
1286 // either all the domains on the stack were system domains, or
1287 // we had a privileged system domain
1288 if (local_array->is_empty()) {
1289 if (is_privileged && privileged_context.is_null()) return NULL;
1290
1291 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1292 return JNIHandles::make_local(env, result);
1293 }
1294
1295 // the resource area must be registered in case of a gc
1296 RegisterArrayForGC ragc(thread, local_array);
1297 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1298 local_array->length(), CHECK_NULL);
1299 objArrayHandle h_context(thread, context);
1300 for (int index = 0; index < local_array->length(); index++) {
1301 h_context->obj_at_put(index, local_array->at(index));
1302 }
1303
1304 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1305
1306 return JNIHandles::make_local(env, result);
1307 JVM_END
1308
1309
1310 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1311 JVMWrapper("JVM_IsArrayClass");
1312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1313 return (k != NULL) && k->oop_is_array() ? true : false;
1314 JVM_END
1315
1316
1317 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1318 JVMWrapper("JVM_IsPrimitiveClass");
1319 oop mirror = JNIHandles::resolve_non_null(cls);
1320 return (jboolean) java_lang_Class::is_primitive(mirror);
1321 JVM_END
1322
1323
1324 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1325 JVMWrapper("JVM_GetClassModifiers");
1326 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1327 // Primitive type
1328 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1329 }
1330
1331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1332 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1333 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1334 return k->modifier_flags();
1335 JVM_END
1336
1337
1338 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1339
1340 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1341 JvmtiVMObjectAllocEventCollector oam;
1342 // ofClass is a reference to a java_lang_Class object. The mirror object
1343 // of an InstanceKlass
1344
1345 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1346 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1347 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1348 return (jobjectArray)JNIHandles::make_local(env, result);
1349 }
1350
1351 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1352 InnerClassesIterator iter(k);
1353
1354 if (iter.length() == 0) {
1355 // Neither an inner nor outer class
1356 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1357 return (jobjectArray)JNIHandles::make_local(env, result);
1358 }
1359
1360 // find inner class info
1361 constantPoolHandle cp(thread, k->constants());
1362 int length = iter.length();
1363
1364 // Allocate temp. result array
1365 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1366 objArrayHandle result (THREAD, r);
1367 int members = 0;
1368
1369 for (; !iter.done(); iter.next()) {
1370 int ioff = iter.inner_class_info_index();
1371 int ooff = iter.outer_class_info_index();
1372
1373 if (ioff != 0 && ooff != 0) {
1374 // Check to see if the name matches the class we're looking for
1375 // before attempting to find the class.
1376 if (cp->klass_name_at_matches(k, ooff)) {
1377 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1378 if (outer_klass == k()) {
1379 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1380 instanceKlassHandle inner_klass (THREAD, ik);
1381
1382 // Throws an exception if outer klass has not declared k as
1383 // an inner klass
1384 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1385
1386 result->obj_at_put(members, inner_klass->java_mirror());
1387 members++;
1388 }
1389 }
1390 }
1391 }
1392
1393 if (members != length) {
1394 // Return array of right length
1395 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1396 for(int i = 0; i < members; i++) {
1397 res->obj_at_put(i, result->obj_at(i));
1398 }
1399 return (jobjectArray)JNIHandles::make_local(env, res);
1400 }
1401
1402 return (jobjectArray)JNIHandles::make_local(env, result());
1403 JVM_END
1404
1405
1406 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1407 {
1408 // ofClass is a reference to a java_lang_Class object.
1409 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1410 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1411 return NULL;
1412 }
1413
1414 bool inner_is_member = false;
1415 Klass* outer_klass
1416 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1417 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1418 if (outer_klass == NULL) return NULL; // already a top-level class
1419 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1420 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1421 }
1422 JVM_END
1423
1424 // should be in InstanceKlass.cpp, but is here for historical reasons
1425 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1426 bool* inner_is_member,
1427 TRAPS) {
1428 Thread* thread = THREAD;
1429 InnerClassesIterator iter(k);
1430 if (iter.length() == 0) {
1431 // No inner class info => no declaring class
1432 return NULL;
1433 }
1434
1435 constantPoolHandle i_cp(thread, k->constants());
1436
1437 bool found = false;
1438 Klass* ok;
1439 instanceKlassHandle outer_klass;
1440 *inner_is_member = false;
1441
1442 // Find inner_klass attribute
1443 for (; !iter.done() && !found; iter.next()) {
1444 int ioff = iter.inner_class_info_index();
1445 int ooff = iter.outer_class_info_index();
1446 int noff = iter.inner_name_index();
1447 if (ioff != 0) {
1448 // Check to see if the name matches the class we're looking for
1449 // before attempting to find the class.
1450 if (i_cp->klass_name_at_matches(k, ioff)) {
1451 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1452 found = (k() == inner_klass);
1453 if (found && ooff != 0) {
1454 ok = i_cp->klass_at(ooff, CHECK_NULL);
1455 outer_klass = instanceKlassHandle(thread, ok);
1456 *inner_is_member = true;
1457 }
1458 }
1459 }
1460 }
1461
1462 if (found && outer_klass.is_null()) {
1463 // It may be anonymous; try for that.
1464 int encl_method_class_idx = k->enclosing_method_class_index();
1465 if (encl_method_class_idx != 0) {
1466 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1467 outer_klass = instanceKlassHandle(thread, ok);
1468 *inner_is_member = false;
1469 }
1470 }
1471
1472 // If no inner class attribute found for this class.
1473 if (outer_klass.is_null()) return NULL;
1474
1475 // Throws an exception if outer klass has not declared k as an inner klass
1476 // We need evidence that each klass knows about the other, or else
1477 // the system could allow a spoof of an inner class to gain access rights.
1478 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1479 return outer_klass();
1480 }
1481
1482 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1483 assert (cls != NULL, "illegal class");
1484 JVMWrapper("JVM_GetClassSignature");
1485 JvmtiVMObjectAllocEventCollector oam;
1486 ResourceMark rm(THREAD);
1487 // Return null for arrays and primatives
1488 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1490 if (k->oop_is_instance()) {
1491 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1492 if (sym == NULL) return NULL;
1493 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1494 return (jstring) JNIHandles::make_local(env, str());
1495 }
1496 }
1497 return NULL;
1498 JVM_END
1499
1500
1501 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1502 assert (cls != NULL, "illegal class");
1503 JVMWrapper("JVM_GetClassAnnotations");
1504
1505 // Return null for arrays and primitives
1506 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1507 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1508 if (k->oop_is_instance()) {
1509 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1510 return (jbyteArray) JNIHandles::make_local(env, a);
1511 }
1512 }
1513 return NULL;
1514 JVM_END
1515
1516
1517 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1518 // some of this code was adapted from from jni_FromReflectedField
1519
1520 oop reflected = JNIHandles::resolve_non_null(field);
1521 oop mirror = java_lang_reflect_Field::clazz(reflected);
1522 Klass* k = java_lang_Class::as_Klass(mirror);
1523 int slot = java_lang_reflect_Field::slot(reflected);
1524 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1525
1526 KlassHandle kh(THREAD, k);
1527 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1528
1529 if (modifiers & JVM_ACC_STATIC) {
1530 // for static fields we only look in the current class
1531 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1532 assert(false, "cannot find static field");
1533 return false;
1534 }
1535 } else {
1536 // for instance fields we start with the current class and work
1537 // our way up through the superclass chain
1538 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1539 assert(false, "cannot find instance field");
1540 return false;
1541 }
1542 }
1543 return true;
1544 }
1545
1546 static Method* jvm_get_method_common(jobject method) {
1547 // some of this code was adapted from from jni_FromReflectedMethod
1548
1549 oop reflected = JNIHandles::resolve_non_null(method);
1550 oop mirror = NULL;
1551 int slot = 0;
1552
1553 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1554 mirror = java_lang_reflect_Constructor::clazz(reflected);
1555 slot = java_lang_reflect_Constructor::slot(reflected);
1556 } else {
1557 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1558 "wrong type");
1559 mirror = java_lang_reflect_Method::clazz(reflected);
1560 slot = java_lang_reflect_Method::slot(reflected);
1561 }
1562 Klass* k = java_lang_Class::as_Klass(mirror);
1563
1564 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1565 assert(m != NULL, "cannot find method");
1566 return m; // caller has to deal with NULL in product mode
1567 }
1568
1569 /* Type use annotations support (JDK 1.8) */
1570
1571 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1572 assert (cls != NULL, "illegal class");
1573 JVMWrapper("JVM_GetClassTypeAnnotations");
1574 ResourceMark rm(THREAD);
1575 // Return null for arrays and primitives
1576 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1578 if (k->oop_is_instance()) {
1579 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1580 if (type_annotations != NULL) {
1581 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1582 return (jbyteArray) JNIHandles::make_local(env, a);
1583 }
1584 }
1585 }
1586 return NULL;
1587 JVM_END
1588
1589 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1590 assert (method != NULL, "illegal method");
1591 JVMWrapper("JVM_GetMethodTypeAnnotations");
1592
1593 // method is a handle to a java.lang.reflect.Method object
1594 Method* m = jvm_get_method_common(method);
1595 if (m == NULL) {
1596 return NULL;
1597 }
1598
1599 AnnotationArray* type_annotations = m->type_annotations();
1600 if (type_annotations != NULL) {
1601 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1602 return (jbyteArray) JNIHandles::make_local(env, a);
1603 }
1604
1605 return NULL;
1606 JVM_END
1607
1608 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1609 assert (field != NULL, "illegal field");
1610 JVMWrapper("JVM_GetFieldTypeAnnotations");
1611
1612 fieldDescriptor fd;
1613 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1614 if (!gotFd) {
1615 return NULL;
1616 }
1617
1618 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1619 JVM_END
1620
1621 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1622 if (!cp->is_within_bounds(index)) {
1623 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1624 }
1625 }
1626
1627 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1628 {
1629 JVMWrapper("JVM_GetMethodParameters");
1630 // method is a handle to a java.lang.reflect.Method object
1631 Method* method_ptr = jvm_get_method_common(method);
1632 methodHandle mh (THREAD, method_ptr);
1633 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1634 const int num_params = mh->method_parameters_length();
1635
1636 if (num_params < 0) {
1637 // A -1 return value from method_parameters_length means there is no
1638 // parameter data. Return null to indicate this to the reflection
1639 // API.
1640 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1641 return (jobjectArray)NULL;
1642 } else {
1643 // Otherwise, we return something up to reflection, even if it is
1644 // a zero-length array. Why? Because in some cases this can
1645 // trigger a MalformedParametersException.
1646
1647 // make sure all the symbols are properly formatted
1648 for (int i = 0; i < num_params; i++) {
1649 MethodParametersElement* params = mh->method_parameters_start();
1650 int index = params[i].name_cp_index;
1651 bounds_check(mh->constants(), index, CHECK_NULL);
1652
1653 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1654 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1655 "Wrong type at constant pool index");
1656 }
1657
1658 }
1659
1660 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1661 objArrayHandle result (THREAD, result_oop);
1662
1663 for (int i = 0; i < num_params; i++) {
1664 MethodParametersElement* params = mh->method_parameters_start();
1665 // For a 0 index, give a NULL symbol
1666 Symbol* sym = 0 != params[i].name_cp_index ?
1667 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1668 int flags = params[i].flags;
1669 oop param = Reflection::new_parameter(reflected_method, i, sym,
1670 flags, CHECK_NULL);
1671 result->obj_at_put(i, param);
1672 }
1673 return (jobjectArray)JNIHandles::make_local(env, result());
1674 }
1675 }
1676 JVM_END
1677
1678 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1679
1680 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1681 {
1682 JVMWrapper("JVM_GetClassDeclaredFields");
1683 JvmtiVMObjectAllocEventCollector oam;
1684
1685 // Exclude primitive types and array types
1686 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1687 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1688 // Return empty array
1689 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1690 return (jobjectArray) JNIHandles::make_local(env, res);
1691 }
1692
1693 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1694 constantPoolHandle cp(THREAD, k->constants());
1695
1696 // Ensure class is linked
1697 k->link_class(CHECK_NULL);
1698
1699 // 4496456 We need to filter out java.lang.Throwable.backtrace
1700 bool skip_backtrace = false;
1701
1702 // Allocate result
1703 int num_fields;
1704
1705 if (publicOnly) {
1706 num_fields = 0;
1707 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1708 if (fs.access_flags().is_public()) ++num_fields;
1709 }
1710 } else {
1711 num_fields = k->java_fields_count();
1712
1713 if (k() == SystemDictionary::Throwable_klass()) {
1714 num_fields--;
1715 skip_backtrace = true;
1716 }
1717 }
1718
1719 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1720 objArrayHandle result (THREAD, r);
1721
1722 int out_idx = 0;
1723 fieldDescriptor fd;
1724 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1725 if (skip_backtrace) {
1726 // 4496456 skip java.lang.Throwable.backtrace
1727 int offset = fs.offset();
1728 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1729 }
1730
1731 if (!publicOnly || fs.access_flags().is_public()) {
1732 fd.reinitialize(k(), fs.index());
1733 oop field = Reflection::new_field(&fd, CHECK_NULL);
1734 result->obj_at_put(out_idx, field);
1735 ++out_idx;
1736 }
1737 }
1738 assert(out_idx == num_fields, "just checking");
1739 return (jobjectArray) JNIHandles::make_local(env, result());
1740 }
1741 JVM_END
1742
1743 static bool select_method(methodHandle method, bool want_constructor) {
1744 if (want_constructor) {
1745 return (method->is_initializer() && !method->is_static());
1746 } else {
1747 return (!method->is_initializer() && !method->is_overpass());
1748 }
1749 }
1750
1751 static jobjectArray get_class_declared_methods_helper(
1752 JNIEnv *env,
1753 jclass ofClass, jboolean publicOnly,
1754 bool want_constructor,
1755 Klass* klass, TRAPS) {
1756
1757 JvmtiVMObjectAllocEventCollector oam;
1758
1759 // Exclude primitive types and array types
1760 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1761 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1762 // Return empty array
1763 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1764 return (jobjectArray) JNIHandles::make_local(env, res);
1765 }
1766
1767 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1768
1769 // Ensure class is linked
1770 k->link_class(CHECK_NULL);
1771
1772 Array<Method*>* methods = k->methods();
1773 int methods_length = methods->length();
1774
1775 // Save original method_idnum in case of redefinition, which can change
1776 // the idnum of obsolete methods. The new method will have the same idnum
1777 // but if we refresh the methods array, the counts will be wrong.
1778 ResourceMark rm(THREAD);
1779 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1780 int num_methods = 0;
1781
1782 for (int i = 0; i < methods_length; i++) {
1783 methodHandle method(THREAD, methods->at(i));
1784 if (select_method(method, want_constructor)) {
1785 if (!publicOnly || method->is_public()) {
1786 idnums->push(method->method_idnum());
1787 ++num_methods;
1788 }
1789 }
1790 }
1791
1792 // Allocate result
1793 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1794 objArrayHandle result (THREAD, r);
1795
1796 // Now just put the methods that we selected above, but go by their idnum
1797 // in case of redefinition. The methods can be redefined at any safepoint,
1798 // so above when allocating the oop array and below when creating reflect
1799 // objects.
1800 for (int i = 0; i < num_methods; i++) {
1801 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1802 if (method.is_null()) {
1803 // Method may have been deleted and seems this API can handle null
1804 // Otherwise should probably put a method that throws NSME
1805 result->obj_at_put(i, NULL);
1806 } else {
1807 oop m;
1808 if (want_constructor) {
1809 m = Reflection::new_constructor(method, CHECK_NULL);
1810 } else {
1811 m = Reflection::new_method(method, false, CHECK_NULL);
1812 }
1813 result->obj_at_put(i, m);
1814 }
1815 }
1816
1817 return (jobjectArray) JNIHandles::make_local(env, result());
1818 }
1819
1820 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1821 {
1822 JVMWrapper("JVM_GetClassDeclaredMethods");
1823 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1824 /*want_constructor*/ false,
1825 SystemDictionary::reflect_Method_klass(), THREAD);
1826 }
1827 JVM_END
1828
1829 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1830 {
1831 JVMWrapper("JVM_GetClassDeclaredConstructors");
1832 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1833 /*want_constructor*/ true,
1834 SystemDictionary::reflect_Constructor_klass(), THREAD);
1835 }
1836 JVM_END
1837
1838 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1839 {
1840 JVMWrapper("JVM_GetClassAccessFlags");
1841 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1842 // Primitive type
1843 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1844 }
1845
1846 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1847 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1848 }
1849 JVM_END
1850
1851
1852 // Constant pool access //////////////////////////////////////////////////////////
1853
1854 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1855 {
1856 JVMWrapper("JVM_GetClassConstantPool");
1857 JvmtiVMObjectAllocEventCollector oam;
1858
1859 // Return null for primitives and arrays
1860 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1861 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1862 if (k->oop_is_instance()) {
1863 instanceKlassHandle k_h(THREAD, k);
1864 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1865 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1866 return JNIHandles::make_local(jcp());
1867 }
1868 }
1869 return NULL;
1870 }
1871 JVM_END
1872
1873
1874 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1875 {
1876 JVMWrapper("JVM_ConstantPoolGetSize");
1877 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1878 return cp->length();
1879 }
1880 JVM_END
1881
1882
1883 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1884 {
1885 JVMWrapper("JVM_ConstantPoolGetClassAt");
1886 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1887 bounds_check(cp, index, CHECK_NULL);
1888 constantTag tag = cp->tag_at(index);
1889 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1890 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1891 }
1892 Klass* k = cp->klass_at(index, CHECK_NULL);
1893 return (jclass) JNIHandles::make_local(k->java_mirror());
1894 }
1895 JVM_END
1896
1897 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1898 {
1899 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1900 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1901 bounds_check(cp, index, CHECK_NULL);
1902 constantTag tag = cp->tag_at(index);
1903 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1904 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1905 }
1906 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1907 if (k == NULL) return NULL;
1908 return (jclass) JNIHandles::make_local(k->java_mirror());
1909 }
1910 JVM_END
1911
1912 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1913 constantTag tag = cp->tag_at(index);
1914 if (!tag.is_method() && !tag.is_interface_method()) {
1915 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1916 }
1917 int klass_ref = cp->uncached_klass_ref_index_at(index);
1918 Klass* k_o;
1919 if (force_resolution) {
1920 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1921 } else {
1922 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1923 if (k_o == NULL) return NULL;
1924 }
1925 instanceKlassHandle k(THREAD, k_o);
1926 Symbol* name = cp->uncached_name_ref_at(index);
1927 Symbol* sig = cp->uncached_signature_ref_at(index);
1928 methodHandle m (THREAD, k->find_method(name, sig));
1929 if (m.is_null()) {
1930 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1931 }
1932 oop method;
1933 if (!m->is_initializer() || m->is_static()) {
1934 method = Reflection::new_method(m, true, CHECK_NULL);
1935 } else {
1936 method = Reflection::new_constructor(m, CHECK_NULL);
1937 }
1938 return JNIHandles::make_local(method);
1939 }
1940
1941 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1942 {
1943 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1944 JvmtiVMObjectAllocEventCollector oam;
1945 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1946 bounds_check(cp, index, CHECK_NULL);
1947 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1948 return res;
1949 }
1950 JVM_END
1951
1952 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1953 {
1954 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1955 JvmtiVMObjectAllocEventCollector oam;
1956 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1957 bounds_check(cp, index, CHECK_NULL);
1958 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1959 return res;
1960 }
1961 JVM_END
1962
1963 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1964 constantTag tag = cp->tag_at(index);
1965 if (!tag.is_field()) {
1966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1967 }
1968 int klass_ref = cp->uncached_klass_ref_index_at(index);
1969 Klass* k_o;
1970 if (force_resolution) {
1971 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1972 } else {
1973 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1974 if (k_o == NULL) return NULL;
1975 }
1976 instanceKlassHandle k(THREAD, k_o);
1977 Symbol* name = cp->uncached_name_ref_at(index);
1978 Symbol* sig = cp->uncached_signature_ref_at(index);
1979 fieldDescriptor fd;
1980 Klass* target_klass = k->find_field(name, sig, &fd);
1981 if (target_klass == NULL) {
1982 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1983 }
1984 oop field = Reflection::new_field(&fd, CHECK_NULL);
1985 return JNIHandles::make_local(field);
1986 }
1987
1988 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1989 {
1990 JVMWrapper("JVM_ConstantPoolGetFieldAt");
1991 JvmtiVMObjectAllocEventCollector oam;
1992 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1993 bounds_check(cp, index, CHECK_NULL);
1994 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
1995 return res;
1996 }
1997 JVM_END
1998
1999 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2000 {
2001 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2002 JvmtiVMObjectAllocEventCollector oam;
2003 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2004 bounds_check(cp, index, CHECK_NULL);
2005 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2006 return res;
2007 }
2008 JVM_END
2009
2010 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2011 {
2012 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2013 JvmtiVMObjectAllocEventCollector oam;
2014 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2015 bounds_check(cp, index, CHECK_NULL);
2016 constantTag tag = cp->tag_at(index);
2017 if (!tag.is_field_or_method()) {
2018 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2019 }
2020 int klass_ref = cp->uncached_klass_ref_index_at(index);
2021 Symbol* klass_name = cp->klass_name_at(klass_ref);
2022 Symbol* member_name = cp->uncached_name_ref_at(index);
2023 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2024 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2025 objArrayHandle dest(THREAD, dest_o);
2026 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2027 dest->obj_at_put(0, str());
2028 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2029 dest->obj_at_put(1, str());
2030 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2031 dest->obj_at_put(2, str());
2032 return (jobjectArray) JNIHandles::make_local(dest());
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2037 {
2038 JVMWrapper("JVM_ConstantPoolGetIntAt");
2039 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2040 bounds_check(cp, index, CHECK_0);
2041 constantTag tag = cp->tag_at(index);
2042 if (!tag.is_int()) {
2043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2044 }
2045 return cp->int_at(index);
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2050 {
2051 JVMWrapper("JVM_ConstantPoolGetLongAt");
2052 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2053 bounds_check(cp, index, CHECK_(0L));
2054 constantTag tag = cp->tag_at(index);
2055 if (!tag.is_long()) {
2056 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2057 }
2058 return cp->long_at(index);
2059 }
2060 JVM_END
2061
2062 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2063 {
2064 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2065 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2066 bounds_check(cp, index, CHECK_(0.0f));
2067 constantTag tag = cp->tag_at(index);
2068 if (!tag.is_float()) {
2069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2070 }
2071 return cp->float_at(index);
2072 }
2073 JVM_END
2074
2075 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2076 {
2077 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2078 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2079 bounds_check(cp, index, CHECK_(0.0));
2080 constantTag tag = cp->tag_at(index);
2081 if (!tag.is_double()) {
2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2083 }
2084 return cp->double_at(index);
2085 }
2086 JVM_END
2087
2088 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2089 {
2090 JVMWrapper("JVM_ConstantPoolGetStringAt");
2091 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092 bounds_check(cp, index, CHECK_NULL);
2093 constantTag tag = cp->tag_at(index);
2094 if (!tag.is_string()) {
2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096 }
2097 oop str = cp->string_at(index, CHECK_NULL);
2098 return (jstring) JNIHandles::make_local(str);
2099 }
2100 JVM_END
2101
2102 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2103 {
2104 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2105 JvmtiVMObjectAllocEventCollector oam;
2106 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2107 bounds_check(cp, index, CHECK_NULL);
2108 constantTag tag = cp->tag_at(index);
2109 if (!tag.is_symbol()) {
2110 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2111 }
2112 Symbol* sym = cp->symbol_at(index);
2113 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2114 return (jstring) JNIHandles::make_local(str());
2115 }
2116 JVM_END
2117
2118
2119 // Assertion support. //////////////////////////////////////////////////////////
2120
2121 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2122 JVMWrapper("JVM_DesiredAssertionStatus");
2123 assert(cls != NULL, "bad class");
2124
2125 oop r = JNIHandles::resolve(cls);
2126 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2127 if (java_lang_Class::is_primitive(r)) return false;
2128
2129 Klass* k = java_lang_Class::as_Klass(r);
2130 assert(k->oop_is_instance(), "must be an instance klass");
2131 if (! k->oop_is_instance()) return false;
2132
2133 ResourceMark rm(THREAD);
2134 const char* name = k->name()->as_C_string();
2135 bool system_class = k->class_loader() == NULL;
2136 return JavaAssertions::enabled(name, system_class);
2137
2138 JVM_END
2139
2140
2141 // Return a new AssertionStatusDirectives object with the fields filled in with
2142 // command-line assertion arguments (i.e., -ea, -da).
2143 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2144 JVMWrapper("JVM_AssertionStatusDirectives");
2145 JvmtiVMObjectAllocEventCollector oam;
2146 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2147 return JNIHandles::make_local(env, asd);
2148 JVM_END
2149
2150 // Verification ////////////////////////////////////////////////////////////////////////////////
2151
2152 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2153
2154 // RedefineClasses support: bug 6214132 caused verification to fail.
2155 // All functions from this section should call the jvmtiThreadSate function:
2156 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2157 // The function returns a Klass* of the _scratch_class if the verifier
2158 // was invoked in the middle of the class redefinition.
2159 // Otherwise it returns its argument value which is the _the_class Klass*.
2160 // Please, refer to the description in the jvmtiThreadSate.hpp.
2161
2162 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2163 JVMWrapper("JVM_GetClassNameUTF");
2164 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2165 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2166 return k->name()->as_utf8();
2167 JVM_END
2168
2169
2170 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2171 JVMWrapper("JVM_GetClassCPTypes");
2172 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2173 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2174 // types will have length zero if this is not an InstanceKlass
2175 // (length is determined by call to JVM_GetClassCPEntriesCount)
2176 if (k->oop_is_instance()) {
2177 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2178 for (int index = cp->length() - 1; index >= 0; index--) {
2179 constantTag tag = cp->tag_at(index);
2180 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2181 }
2182 }
2183 JVM_END
2184
2185
2186 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2187 JVMWrapper("JVM_GetClassCPEntriesCount");
2188 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2189 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2190 if (!k->oop_is_instance())
2191 return 0;
2192 return InstanceKlass::cast(k)->constants()->length();
2193 JVM_END
2194
2195
2196 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2197 JVMWrapper("JVM_GetClassFieldsCount");
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)->java_fields_count();
2203 JVM_END
2204
2205
2206 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2207 JVMWrapper("JVM_GetClassMethodsCount");
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)->methods()->length();
2213 JVM_END
2214
2215
2216 // The following methods, used for the verifier, are never called with
2217 // array klasses, so a direct cast to InstanceKlass is safe.
2218 // Typically, these methods are called in a loop with bounds determined
2219 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2220 // zero for arrays.
2221 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2222 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2223 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2224 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2225 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2226 int length = method->checked_exceptions_length();
2227 if (length > 0) {
2228 CheckedExceptionElement* table= method->checked_exceptions_start();
2229 for (int i = 0; i < length; i++) {
2230 exceptions[i] = table[i].class_cp_index;
2231 }
2232 }
2233 JVM_END
2234
2235
2236 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2237 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2238 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2239 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2240 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2241 return method->checked_exceptions_length();
2242 JVM_END
2243
2244
2245 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2246 JVMWrapper("JVM_GetMethodIxByteCode");
2247 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2248 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2249 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2250 memcpy(code, method->code_base(), method->code_size());
2251 JVM_END
2252
2253
2254 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2255 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2256 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2257 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2258 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2259 return method->code_size();
2260 JVM_END
2261
2262
2263 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2264 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2265 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2266 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2267 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2268 ExceptionTable extable(method);
2269 entry->start_pc = extable.start_pc(entry_index);
2270 entry->end_pc = extable.end_pc(entry_index);
2271 entry->handler_pc = extable.handler_pc(entry_index);
2272 entry->catchType = extable.catch_type_index(entry_index);
2273 JVM_END
2274
2275
2276 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2277 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2278 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2279 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2280 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2281 return method->exception_table_length();
2282 JVM_END
2283
2284
2285 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2286 JVMWrapper("JVM_GetMethodIxModifiers");
2287 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2288 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2289 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2290 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2291 JVM_END
2292
2293
2294 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2295 JVMWrapper("JVM_GetFieldIxModifiers");
2296 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2297 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2298 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2299 JVM_END
2300
2301
2302 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2303 JVMWrapper("JVM_GetMethodIxLocalsCount");
2304 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2305 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2306 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2307 return method->max_locals();
2308 JVM_END
2309
2310
2311 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2312 JVMWrapper("JVM_GetMethodIxArgsSize");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2316 return method->size_of_parameters();
2317 JVM_END
2318
2319
2320 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2321 JVMWrapper("JVM_GetMethodIxMaxStack");
2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2325 return method->verifier_max_stack();
2326 JVM_END
2327
2328
2329 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2330 JVMWrapper("JVM_IsConstructorIx");
2331 ResourceMark rm(THREAD);
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->name() == vmSymbols::object_initializer_name();
2336 JVM_END
2337
2338
2339 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2340 JVMWrapper("JVM_IsVMGeneratedMethodIx");
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->is_overpass();
2346 JVM_END
2347
2348 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2349 JVMWrapper("JVM_GetMethodIxIxUTF");
2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2352 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2353 return method->name()->as_utf8();
2354 JVM_END
2355
2356
2357 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2358 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2362 return method->signature()->as_utf8();
2363 JVM_END
2364
2365 /**
2366 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2367 * read entries in the constant pool. Since the old verifier always
2368 * works on a copy of the code, it will not see any rewriting that
2369 * may possibly occur in the middle of verification. So it is important
2370 * that nothing it calls tries to use the cpCache instead of the raw
2371 * constant pool, so we must use cp->uncached_x methods when appropriate.
2372 */
2373 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2374 JVMWrapper("JVM_GetCPFieldNameUTF");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2378 switch (cp->tag_at(cp_index).value()) {
2379 case JVM_CONSTANT_Fieldref:
2380 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2381 default:
2382 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2383 }
2384 ShouldNotReachHere();
2385 return NULL;
2386 JVM_END
2387
2388
2389 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2390 JVMWrapper("JVM_GetCPMethodNameUTF");
2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2393 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2394 switch (cp->tag_at(cp_index).value()) {
2395 case JVM_CONSTANT_InterfaceMethodref:
2396 case JVM_CONSTANT_Methodref:
2397 case JVM_CONSTANT_NameAndType: // for invokedynamic
2398 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2399 default:
2400 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2401 }
2402 ShouldNotReachHere();
2403 return NULL;
2404 JVM_END
2405
2406
2407 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2408 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2412 switch (cp->tag_at(cp_index).value()) {
2413 case JVM_CONSTANT_InterfaceMethodref:
2414 case JVM_CONSTANT_Methodref:
2415 case JVM_CONSTANT_NameAndType: // for invokedynamic
2416 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2417 default:
2418 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2419 }
2420 ShouldNotReachHere();
2421 return NULL;
2422 JVM_END
2423
2424
2425 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2426 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2429 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2430 switch (cp->tag_at(cp_index).value()) {
2431 case JVM_CONSTANT_Fieldref:
2432 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2433 default:
2434 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2435 }
2436 ShouldNotReachHere();
2437 return NULL;
2438 JVM_END
2439
2440
2441 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2442 JVMWrapper("JVM_GetCPClassNameUTF");
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2446 Symbol* classname = cp->klass_name_at(cp_index);
2447 return classname->as_utf8();
2448 JVM_END
2449
2450
2451 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2452 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2456 switch (cp->tag_at(cp_index).value()) {
2457 case JVM_CONSTANT_Fieldref: {
2458 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2459 Symbol* classname = cp->klass_name_at(class_index);
2460 return classname->as_utf8();
2461 }
2462 default:
2463 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2464 }
2465 ShouldNotReachHere();
2466 return NULL;
2467 JVM_END
2468
2469
2470 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2471 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2475 switch (cp->tag_at(cp_index).value()) {
2476 case JVM_CONSTANT_Methodref:
2477 case JVM_CONSTANT_InterfaceMethodref: {
2478 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2479 Symbol* classname = cp->klass_name_at(class_index);
2480 return classname->as_utf8();
2481 }
2482 default:
2483 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2484 }
2485 ShouldNotReachHere();
2486 return NULL;
2487 JVM_END
2488
2489
2490 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2491 JVMWrapper("JVM_GetCPFieldModifiers");
2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2496 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2497 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2498 switch (cp->tag_at(cp_index).value()) {
2499 case JVM_CONSTANT_Fieldref: {
2500 Symbol* name = cp->uncached_name_ref_at(cp_index);
2501 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2502 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2503 if (fs.name() == name && fs.signature() == signature) {
2504 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2505 }
2506 }
2507 return -1;
2508 }
2509 default:
2510 fatal("JVM_GetCPFieldModifiers: illegal constant");
2511 }
2512 ShouldNotReachHere();
2513 return 0;
2514 JVM_END
2515
2516
2517 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2518 JVMWrapper("JVM_GetCPMethodModifiers");
2519 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2520 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2523 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2524 switch (cp->tag_at(cp_index).value()) {
2525 case JVM_CONSTANT_Methodref:
2526 case JVM_CONSTANT_InterfaceMethodref: {
2527 Symbol* name = cp->uncached_name_ref_at(cp_index);
2528 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2529 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2530 int methods_count = methods->length();
2531 for (int i = 0; i < methods_count; i++) {
2532 Method* method = methods->at(i);
2533 if (method->name() == name && method->signature() == signature) {
2534 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2535 }
2536 }
2537 return -1;
2538 }
2539 default:
2540 fatal("JVM_GetCPMethodModifiers: illegal constant");
2541 }
2542 ShouldNotReachHere();
2543 return 0;
2544 JVM_END
2545
2546
2547 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2548
2549 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2550 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2551 JVM_END
2552
2553
2554 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2555 JVMWrapper("JVM_IsSameClassPackage");
2556 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2557 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2558 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2559 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2560 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2561 JVM_END
2562
2563 // Printing support //////////////////////////////////////////////////
2564 extern "C" {
2565
2566 ATTRIBUTE_PRINTF(3, 0)
2567 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2568 // see bug 4399518, 4417214
2569 if ((intptr_t)count <= 0) return -1;
2570
2571 int result = vsnprintf(str, count, fmt, args);
2572 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2573 // characters which would have been written had the buffer been large
2574 // enough; on Windows, it returns -1. We handle both cases here and
2575 // always return -1, and perform null termination.
2576 if ((result > 0 && (size_t)result >= count) || result == -1) {
2577 str[count - 1] = '\0';
2578 result = -1;
2579 }
2580
2581 return result;
2582 }
2583
2584 ATTRIBUTE_PRINTF(3, 0)
2585 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2586 va_list args;
2587 int len;
2588 va_start(args, fmt);
2589 len = jio_vsnprintf(str, count, fmt, args);
2590 va_end(args);
2591 return len;
2592 }
2593
2594 ATTRIBUTE_PRINTF(2,3)
2595 int jio_fprintf(FILE* f, const char *fmt, ...) {
2596 int len;
2597 va_list args;
2598 va_start(args, fmt);
2599 len = jio_vfprintf(f, fmt, args);
2600 va_end(args);
2601 return len;
2602 }
2603
2604 ATTRIBUTE_PRINTF(2, 0)
2605 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2606 if (Arguments::vfprintf_hook() != NULL) {
2607 return Arguments::vfprintf_hook()(f, fmt, args);
2608 } else {
2609 return vfprintf(f, fmt, args);
2610 }
2611 }
2612
2613 ATTRIBUTE_PRINTF(1, 2)
2614 JNIEXPORT int jio_printf(const char *fmt, ...) {
2615 int len;
2616 va_list args;
2617 va_start(args, fmt);
2618 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2619 va_end(args);
2620 return len;
2621 }
2622
2623
2624 // HotSpot specific jio method
2625 void jio_print(const char* s) {
2626 // Try to make this function as atomic as possible.
2627 if (Arguments::vfprintf_hook() != NULL) {
2628 jio_fprintf(defaultStream::output_stream(), "%s", s);
2629 } else {
2630 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2631 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2632 }
2633 }
2634
2635 } // Extern C
2636
2637 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2638
2639 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2640 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2641 // OSThread objects. The exception to this rule is when the target object is the thread
2642 // doing the operation, in which case we know that the thread won't exit until the
2643 // operation is done (all exits being voluntary). There are a few cases where it is
2644 // rather silly to do operations on yourself, like resuming yourself or asking whether
2645 // you are alive. While these can still happen, they are not subject to deadlocks if
2646 // the lock is held while the operation occurs (this is not the case for suspend, for
2647 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2648 // implementation is local to this file, we always lock Threads_lock for that one.
2649
2650 static void thread_entry(JavaThread* thread, TRAPS) {
2651 HandleMark hm(THREAD);
2652 Handle obj(THREAD, thread->threadObj());
2653 JavaValue result(T_VOID);
2654 JavaCalls::call_virtual(&result,
2655 obj,
2656 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2657 vmSymbols::run_method_name(),
2658 vmSymbols::void_method_signature(),
2659 THREAD);
2660 }
2661
2662
2663 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2664 JVMWrapper("JVM_StartThread");
2665 JavaThread *native_thread = NULL;
2666
2667 // We cannot hold the Threads_lock when we throw an exception,
2668 // due to rank ordering issues. Example: we might need to grab the
2669 // Heap_lock while we construct the exception.
2670 bool throw_illegal_thread_state = false;
2671
2672 // We must release the Threads_lock before we can post a jvmti event
2673 // in Thread::start.
2674 {
2675 // Ensure that the C++ Thread and OSThread structures aren't freed before
2676 // we operate.
2677 MutexLocker mu(Threads_lock);
2678
2679 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2680 // re-starting an already started thread, so we should usually find
2681 // that the JavaThread is null. However for a JNI attached thread
2682 // there is a small window between the Thread object being created
2683 // (with its JavaThread set) and the update to its threadStatus, so we
2684 // have to check for this
2685 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2686 throw_illegal_thread_state = true;
2687 } else {
2688 // We could also check the stillborn flag to see if this thread was already stopped, but
2689 // for historical reasons we let the thread detect that itself when it starts running
2690
2691 jlong size =
2692 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2693 // Allocate the C++ Thread structure and create the native thread. The
2694 // stack size retrieved from java is signed, but the constructor takes
2695 // size_t (an unsigned type), so avoid passing negative values which would
2696 // result in really large stacks.
2697 size_t sz = size > 0 ? (size_t) size : 0;
2698 native_thread = new JavaThread(&thread_entry, sz);
2699
2700 // At this point it may be possible that no osthread was created for the
2701 // JavaThread due to lack of memory. Check for this situation and throw
2702 // an exception if necessary. Eventually we may want to change this so
2703 // that we only grab the lock if the thread was created successfully -
2704 // then we can also do this check and throw the exception in the
2705 // JavaThread constructor.
2706 if (native_thread->osthread() != NULL) {
2707 // Note: the current thread is not being used within "prepare".
2708 native_thread->prepare(jthread);
2709 }
2710 }
2711 }
2712
2713 if (throw_illegal_thread_state) {
2714 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2715 }
2716
2717 assert(native_thread != NULL, "Starting null thread?");
2718
2719 if (native_thread->osthread() == NULL) {
2720 // No one should hold a reference to the 'native_thread'.
2721 delete native_thread;
2722 if (JvmtiExport::should_post_resource_exhausted()) {
2723 JvmtiExport::post_resource_exhausted(
2724 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2725 os::native_thread_creation_failed_msg());
2726 }
2727 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2728 os::native_thread_creation_failed_msg());
2729 }
2730
2731 Thread::start(native_thread);
2732
2733 JVM_END
2734
2735 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2736 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2737 // but is thought to be reliable and simple. In the case, where the receiver is the
2738 // same thread as the sender, no safepoint is needed.
2739 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2740 JVMWrapper("JVM_StopThread");
2741
2742 oop java_throwable = JNIHandles::resolve(throwable);
2743 if (java_throwable == NULL) {
2744 THROW(vmSymbols::java_lang_NullPointerException());
2745 }
2746 oop java_thread = JNIHandles::resolve_non_null(jthread);
2747 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2748 Events::log_exception(JavaThread::current(),
2749 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2750 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2751 // First check if thread is alive
2752 if (receiver != NULL) {
2753 // Check if exception is getting thrown at self (use oop equality, since the
2754 // target object might exit)
2755 if (java_thread == thread->threadObj()) {
2756 THROW_OOP(java_throwable);
2757 } else {
2758 // Enques a VM_Operation to stop all threads and then deliver the exception...
2759 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2760 }
2761 }
2762 else {
2763 // Either:
2764 // - target thread has not been started before being stopped, or
2765 // - target thread already terminated
2766 // We could read the threadStatus to determine which case it is
2767 // but that is overkill as it doesn't matter. We must set the
2768 // stillborn flag for the first case, and if the thread has already
2769 // exited setting this flag has no affect
2770 java_lang_Thread::set_stillborn(java_thread);
2771 }
2772 JVM_END
2773
2774
2775 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2776 JVMWrapper("JVM_IsThreadAlive");
2777
2778 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2779 return java_lang_Thread::is_alive(thread_oop);
2780 JVM_END
2781
2782
2783 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2784 JVMWrapper("JVM_SuspendThread");
2785 oop java_thread = JNIHandles::resolve_non_null(jthread);
2786 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2787
2788 if (receiver != NULL) {
2789 // thread has run and has not exited (still on threads list)
2790
2791 {
2792 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2793 if (receiver->is_external_suspend()) {
2794 // Don't allow nested external suspend requests. We can't return
2795 // an error from this interface so just ignore the problem.
2796 return;
2797 }
2798 if (receiver->is_exiting()) { // thread is in the process of exiting
2799 return;
2800 }
2801 receiver->set_external_suspend();
2802 }
2803
2804 // java_suspend() will catch threads in the process of exiting
2805 // and will ignore them.
2806 receiver->java_suspend();
2807
2808 // It would be nice to have the following assertion in all the
2809 // time, but it is possible for a racing resume request to have
2810 // resumed this thread right after we suspended it. Temporarily
2811 // enable this assertion if you are chasing a different kind of
2812 // bug.
2813 //
2814 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2815 // receiver->is_being_ext_suspended(), "thread is not suspended");
2816 }
2817 JVM_END
2818
2819
2820 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2821 JVMWrapper("JVM_ResumeThread");
2822 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2823 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2824 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2825 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2826 // looks at it.
2827 MutexLocker ml(Threads_lock);
2828 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2829 if (thr != NULL) {
2830 // the thread has run and is not in the process of exiting
2831 thr->java_resume();
2832 }
2833 JVM_END
2834
2835
2836 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2837 JVMWrapper("JVM_SetThreadPriority");
2838 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2839 MutexLocker ml(Threads_lock);
2840 oop java_thread = JNIHandles::resolve_non_null(jthread);
2841 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2842 JavaThread* thr = java_lang_Thread::thread(java_thread);
2843 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2844 Thread::set_priority(thr, (ThreadPriority)prio);
2845 }
2846 JVM_END
2847
2848
2849 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2850 JVMWrapper("JVM_Yield");
2851 if (os::dont_yield()) return;
2852 HOTSPOT_THREAD_YIELD();
2853
2854 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2855 // Critical for similar threading behaviour
2856 if (ConvertYieldToSleep) {
2857 os::sleep(thread, MinSleepInterval, false);
2858 } else {
2859 os::naked_yield();
2860 }
2861 JVM_END
2862
2863
2864 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2865 JVMWrapper("JVM_Sleep");
2866
2867 if (millis < 0) {
2868 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2869 }
2870
2871 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2872 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2873 }
2874
2875 // Save current thread state and restore it at the end of this block.
2876 // And set new thread state to SLEEPING.
2877 JavaThreadSleepState jtss(thread);
2878
2879 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2880
2881 EventThreadSleep event;
2882
2883 if (millis == 0) {
2884 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2885 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2886 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2887 // for SOLARIS
2888 if (ConvertSleepToYield) {
2889 os::naked_yield();
2890 } else {
2891 ThreadState old_state = thread->osthread()->get_state();
2892 thread->osthread()->set_state(SLEEPING);
2893 os::sleep(thread, MinSleepInterval, false);
2894 thread->osthread()->set_state(old_state);
2895 }
2896 } else {
2897 ThreadState old_state = thread->osthread()->get_state();
2898 thread->osthread()->set_state(SLEEPING);
2899 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2900 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2901 // us while we were sleeping. We do not overwrite those.
2902 if (!HAS_PENDING_EXCEPTION) {
2903 if (event.should_commit()) {
2904 event.set_time(millis);
2905 event.commit();
2906 }
2907 HOTSPOT_THREAD_SLEEP_END(1);
2908
2909 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2910 // to properly restore the thread state. That's likely wrong.
2911 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2912 }
2913 }
2914 thread->osthread()->set_state(old_state);
2915 }
2916 if (event.should_commit()) {
2917 event.set_time(millis);
2918 event.commit();
2919 }
2920 HOTSPOT_THREAD_SLEEP_END(0);
2921 JVM_END
2922
2923 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2924 JVMWrapper("JVM_CurrentThread");
2925 oop jthread = thread->threadObj();
2926 assert (thread != NULL, "no current thread!");
2927 return JNIHandles::make_local(env, jthread);
2928 JVM_END
2929
2930
2931 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2932 JVMWrapper("JVM_CountStackFrames");
2933
2934 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2935 oop java_thread = JNIHandles::resolve_non_null(jthread);
2936 bool throw_illegal_thread_state = false;
2937 int count = 0;
2938
2939 {
2940 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2941 // We need to re-resolve the java_thread, since a GC might have happened during the
2942 // acquire of the lock
2943 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2944
2945 if (thr == NULL) {
2946 // do nothing
2947 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2948 // Check whether this java thread has been suspended already. If not, throws
2949 // IllegalThreadStateException. We defer to throw that exception until
2950 // Threads_lock is released since loading exception class has to leave VM.
2951 // The correct way to test a thread is actually suspended is
2952 // wait_for_ext_suspend_completion(), but we can't call that while holding
2953 // the Threads_lock. The above tests are sufficient for our purposes
2954 // provided the walkability of the stack is stable - which it isn't
2955 // 100% but close enough for most practical purposes.
2956 throw_illegal_thread_state = true;
2957 } else {
2958 // Count all java activation, i.e., number of vframes
2959 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
2960 // Native frames are not counted
2961 if (!vfst.method()->is_native()) count++;
2962 }
2963 }
2964 }
2965
2966 if (throw_illegal_thread_state) {
2967 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
2968 "this thread is not suspended");
2969 }
2970 return count;
2971 JVM_END
2972
2973 // Consider: A better way to implement JVM_Interrupt() is to acquire
2974 // Threads_lock to resolve the jthread into a Thread pointer, fetch
2975 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
2976 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
2977 // outside the critical section. Threads_lock is hot so we want to minimize
2978 // the hold-time. A cleaner interface would be to decompose interrupt into
2979 // two steps. The 1st phase, performed under Threads_lock, would return
2980 // a closure that'd be invoked after Threads_lock was dropped.
2981 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
2982 // admit spurious wakeups.
2983
2984 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2985 JVMWrapper("JVM_Interrupt");
2986
2987 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2988 oop java_thread = JNIHandles::resolve_non_null(jthread);
2989 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2990 // We need to re-resolve the java_thread, since a GC might have happened during the
2991 // acquire of the lock
2992 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2993 if (thr != NULL) {
2994 Thread::interrupt(thr);
2995 }
2996 JVM_END
2997
2998
2999 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3000 JVMWrapper("JVM_IsInterrupted");
3001
3002 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3003 oop java_thread = JNIHandles::resolve_non_null(jthread);
3004 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3005 // We need to re-resolve the java_thread, since a GC might have happened during the
3006 // acquire of the lock
3007 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3008 if (thr == NULL) {
3009 return JNI_FALSE;
3010 } else {
3011 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3012 }
3013 JVM_END
3014
3015
3016 // Return true iff the current thread has locked the object passed in
3017
3018 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3019 JVMWrapper("JVM_HoldsLock");
3020 assert(THREAD->is_Java_thread(), "sanity check");
3021 if (obj == NULL) {
3022 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3023 }
3024 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3025 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3026 JVM_END
3027
3028
3029 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3030 JVMWrapper("JVM_DumpAllStacks");
3031 VM_PrintThreads op;
3032 VMThread::execute(&op);
3033 if (JvmtiExport::should_post_data_dump()) {
3034 JvmtiExport::post_data_dump();
3035 }
3036 JVM_END
3037
3038 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3039 JVMWrapper("JVM_SetNativeThreadName");
3040 ResourceMark rm(THREAD);
3041 oop java_thread = JNIHandles::resolve_non_null(jthread);
3042 JavaThread* thr = java_lang_Thread::thread(java_thread);
3043 // Thread naming only supported for the current thread, doesn't work for
3044 // target threads.
3045 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3046 // we don't set the name of an attached thread to avoid stepping
3047 // on other programs
3048 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3049 os::set_native_thread_name(thread_name);
3050 }
3051 JVM_END
3052
3053 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3054
3055 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3056 assert(jthread->is_Java_thread(), "must be a Java thread");
3057 if (jthread->privileged_stack_top() == NULL) return false;
3058 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3059 oop loader = jthread->privileged_stack_top()->class_loader();
3060 if (loader == NULL) return true;
3061 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3062 if (trusted) return true;
3063 }
3064 return false;
3065 }
3066
3067 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3068 JVMWrapper("JVM_CurrentLoadedClass");
3069 ResourceMark rm(THREAD);
3070
3071 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3072 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3073 bool trusted = is_trusted_frame(thread, &vfst);
3074 if (trusted) return NULL;
3075
3076 Method* m = vfst.method();
3077 if (!m->is_native()) {
3078 InstanceKlass* holder = m->method_holder();
3079 oop loader = holder->class_loader();
3080 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3081 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3082 }
3083 }
3084 }
3085 return NULL;
3086 JVM_END
3087
3088
3089 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3090 JVMWrapper("JVM_CurrentClassLoader");
3091 ResourceMark rm(THREAD);
3092
3093 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3094
3095 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3096 bool trusted = is_trusted_frame(thread, &vfst);
3097 if (trusted) return NULL;
3098
3099 Method* m = vfst.method();
3100 if (!m->is_native()) {
3101 InstanceKlass* holder = m->method_holder();
3102 assert(holder->is_klass(), "just checking");
3103 oop loader = holder->class_loader();
3104 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3105 return JNIHandles::make_local(env, loader);
3106 }
3107 }
3108 }
3109 return NULL;
3110 JVM_END
3111
3112
3113 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3114 JVMWrapper("JVM_GetClassContext");
3115 ResourceMark rm(THREAD);
3116 JvmtiVMObjectAllocEventCollector oam;
3117 vframeStream vfst(thread);
3118
3119 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3120 // This must only be called from SecurityManager.getClassContext
3121 Method* m = vfst.method();
3122 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3123 m->name() == vmSymbols::getClassContext_name() &&
3124 m->signature() == vmSymbols::void_class_array_signature())) {
3125 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3126 }
3127 }
3128
3129 // Collect method holders
3130 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3131 for (; !vfst.at_end(); vfst.security_next()) {
3132 Method* m = vfst.method();
3133 // Native frames are not returned
3134 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3135 Klass* holder = m->method_holder();
3136 assert(holder->is_klass(), "just checking");
3137 klass_array->append(holder);
3138 }
3139 }
3140
3141 // Create result array of type [Ljava/lang/Class;
3142 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3143 // Fill in mirrors corresponding to method holders
3144 for (int i = 0; i < klass_array->length(); i++) {
3145 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3146 }
3147
3148 return (jobjectArray) JNIHandles::make_local(env, result);
3149 JVM_END
3150
3151
3152 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3153 JVMWrapper("JVM_ClassDepth");
3154 ResourceMark rm(THREAD);
3155 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3156 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3157
3158 const char* str = java_lang_String::as_utf8_string(class_name_str());
3159 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3160 if (class_name_sym == NULL) {
3161 return -1;
3162 }
3163
3164 int depth = 0;
3165
3166 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3167 if (!vfst.method()->is_native()) {
3168 InstanceKlass* holder = vfst.method()->method_holder();
3169 assert(holder->is_klass(), "just checking");
3170 if (holder->name() == class_name_sym) {
3171 return depth;
3172 }
3173 depth++;
3174 }
3175 }
3176 return -1;
3177 JVM_END
3178
3179
3180 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3181 JVMWrapper("JVM_ClassLoaderDepth");
3182 ResourceMark rm(THREAD);
3183 int depth = 0;
3184 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3185 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3186 bool trusted = is_trusted_frame(thread, &vfst);
3187 if (trusted) return -1;
3188
3189 Method* m = vfst.method();
3190 if (!m->is_native()) {
3191 InstanceKlass* holder = m->method_holder();
3192 assert(holder->is_klass(), "just checking");
3193 oop loader = holder->class_loader();
3194 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3195 return depth;
3196 }
3197 depth++;
3198 }
3199 }
3200 return -1;
3201 JVM_END
3202
3203
3204 // java.lang.Package ////////////////////////////////////////////////////////////////
3205
3206
3207 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3208 JVMWrapper("JVM_GetSystemPackage");
3209 ResourceMark rm(THREAD);
3210 JvmtiVMObjectAllocEventCollector oam;
3211 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3212 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3213 return (jstring) JNIHandles::make_local(result);
3214 JVM_END
3215
3216
3217 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3218 JVMWrapper("JVM_GetSystemPackages");
3219 JvmtiVMObjectAllocEventCollector oam;
3220 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3221 return (jobjectArray) JNIHandles::make_local(result);
3222 JVM_END
3223
3224
3225 // ObjectInputStream ///////////////////////////////////////////////////////////////
3226
3227 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3228 if (current_class == NULL) {
3229 return true;
3230 }
3231 if ((current_class == field_class) || access.is_public()) {
3232 return true;
3233 }
3234
3235 if (access.is_protected()) {
3236 // See if current_class is a subclass of field_class
3237 if (current_class->is_subclass_of(field_class)) {
3238 return true;
3239 }
3240 }
3241
3242 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3243 }
3244
3245 // Return the first non-null class loader up the execution stack, or null
3246 // if only code from the null class loader is on the stack.
3247
3248 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3249 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3250 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3251 oop loader = vfst.method()->method_holder()->class_loader();
3252 if (loader != NULL) {
3253 return JNIHandles::make_local(env, loader);
3254 }
3255 }
3256 return NULL;
3257 JVM_END
3258
3259
3260 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3261
3262
3263 // resolve array handle and check arguments
3264 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3265 if (arr == NULL) {
3266 THROW_0(vmSymbols::java_lang_NullPointerException());
3267 }
3268 oop a = JNIHandles::resolve_non_null(arr);
3269 if (!a->is_array()) {
3270 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3271 } else if (type_array_only && !a->is_typeArray()) {
3272 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3273 }
3274 return arrayOop(a);
3275 }
3276
3277
3278 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3279 JVMWrapper("JVM_GetArrayLength");
3280 arrayOop a = check_array(env, arr, false, CHECK_0);
3281 return a->length();
3282 JVM_END
3283
3284
3285 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3286 JVMWrapper("JVM_Array_Get");
3287 JvmtiVMObjectAllocEventCollector oam;
3288 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3289 jvalue value;
3290 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3291 oop box = Reflection::box(&value, type, CHECK_NULL);
3292 return JNIHandles::make_local(env, box);
3293 JVM_END
3294
3295
3296 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3297 JVMWrapper("JVM_GetPrimitiveArrayElement");
3298 jvalue value;
3299 value.i = 0; // to initialize value before getting used in CHECK
3300 arrayOop a = check_array(env, arr, true, CHECK_(value));
3301 assert(a->is_typeArray(), "just checking");
3302 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3303 BasicType wide_type = (BasicType) wCode;
3304 if (type != wide_type) {
3305 Reflection::widen(&value, type, wide_type, CHECK_(value));
3306 }
3307 return value;
3308 JVM_END
3309
3310
3311 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3312 JVMWrapper("JVM_SetArrayElement");
3313 arrayOop a = check_array(env, arr, false, CHECK);
3314 oop box = JNIHandles::resolve(val);
3315 jvalue value;
3316 value.i = 0; // to initialize value before getting used in CHECK
3317 BasicType value_type;
3318 if (a->is_objArray()) {
3319 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3320 value_type = Reflection::unbox_for_regular_object(box, &value);
3321 } else {
3322 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3323 }
3324 Reflection::array_set(&value, a, index, value_type, CHECK);
3325 JVM_END
3326
3327
3328 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3329 JVMWrapper("JVM_SetPrimitiveArrayElement");
3330 arrayOop a = check_array(env, arr, true, CHECK);
3331 assert(a->is_typeArray(), "just checking");
3332 BasicType value_type = (BasicType) vCode;
3333 Reflection::array_set(&v, a, index, value_type, CHECK);
3334 JVM_END
3335
3336
3337 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3338 JVMWrapper("JVM_NewArray");
3339 JvmtiVMObjectAllocEventCollector oam;
3340 oop element_mirror = JNIHandles::resolve(eltClass);
3341 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3342 return JNIHandles::make_local(env, result);
3343 JVM_END
3344
3345
3346 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3347 JVMWrapper("JVM_NewMultiArray");
3348 JvmtiVMObjectAllocEventCollector oam;
3349 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3350 oop element_mirror = JNIHandles::resolve(eltClass);
3351 assert(dim_array->is_typeArray(), "just checking");
3352 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3353 return JNIHandles::make_local(env, result);
3354 JVM_END
3355
3356
3357 // Library support ///////////////////////////////////////////////////////////////////////////
3358
3359 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3360 //%note jvm_ct
3361 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3362 char ebuf[1024];
3363 void *load_result;
3364 {
3365 ThreadToNativeFromVM ttnfvm(thread);
3366 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3367 }
3368 if (load_result == NULL) {
3369 char msg[1024];
3370 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3371 // Since 'ebuf' may contain a string encoded using
3372 // platform encoding scheme, we need to pass
3373 // Exceptions::unsafe_to_utf8 to the new_exception method
3374 // as the last argument. See bug 6367357.
3375 Handle h_exception =
3376 Exceptions::new_exception(thread,
3377 vmSymbols::java_lang_UnsatisfiedLinkError(),
3378 msg, Exceptions::unsafe_to_utf8);
3379
3380 THROW_HANDLE_0(h_exception);
3381 }
3382 return load_result;
3383 JVM_END
3384
3385
3386 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3387 JVMWrapper("JVM_UnloadLibrary");
3388 os::dll_unload(handle);
3389 JVM_END
3390
3391
3392 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3393 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3394 return os::dll_lookup(handle, name);
3395 JVM_END
3396
3397
3398 // JNI version ///////////////////////////////////////////////////////////////////////////////
3399
3400 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3401 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3402 return Threads::is_supported_jni_version_including_1_1(version);
3403 JVM_END
3404
3405
3406 // String support ///////////////////////////////////////////////////////////////////////////
3407
3408 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3409 JVMWrapper("JVM_InternString");
3410 JvmtiVMObjectAllocEventCollector oam;
3411 if (str == NULL) return NULL;
3412 oop string = JNIHandles::resolve_non_null(str);
3413 oop result = StringTable::intern(string, CHECK_NULL);
3414 return (jstring) JNIHandles::make_local(env, result);
3415 JVM_END
3416
3417
3418 // Raw monitor support //////////////////////////////////////////////////////////////////////
3419
3420 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3421 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3422 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3423 // that only works with java threads.
3424
3425
3426 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3427 VM_Exit::block_if_vm_exited();
3428 JVMWrapper("JVM_RawMonitorCreate");
3429 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3430 }
3431
3432
3433 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3434 VM_Exit::block_if_vm_exited();
3435 JVMWrapper("JVM_RawMonitorDestroy");
3436 delete ((Mutex*) mon);
3437 }
3438
3439
3440 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3441 VM_Exit::block_if_vm_exited();
3442 JVMWrapper("JVM_RawMonitorEnter");
3443 ((Mutex*) mon)->jvm_raw_lock();
3444 return 0;
3445 }
3446
3447
3448 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3449 VM_Exit::block_if_vm_exited();
3450 JVMWrapper("JVM_RawMonitorExit");
3451 ((Mutex*) mon)->jvm_raw_unlock();
3452 }
3453
3454
3455 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3456
3457 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3458 Handle loader, Handle protection_domain,
3459 jboolean throwError, TRAPS) {
3460 // Security Note:
3461 // The Java level wrapper will perform the necessary security check allowing
3462 // us to pass the NULL as the initiating class loader. The VM is responsible for
3463 // the checkPackageAccess relative to the initiating class loader via the
3464 // protection_domain. The protection_domain is passed as NULL by the java code
3465 // if there is no security manager in 3-arg Class.forName().
3466 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3467
3468 KlassHandle klass_handle(THREAD, klass);
3469 // Check if we should initialize the class
3470 if (init && klass_handle->oop_is_instance()) {
3471 klass_handle->initialize(CHECK_NULL);
3472 }
3473 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3474 }
3475
3476
3477 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3478
3479 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3480 JVMWrapper("JVM_InvokeMethod");
3481 Handle method_handle;
3482 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3483 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3484 Handle receiver(THREAD, JNIHandles::resolve(obj));
3485 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3486 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3487 jobject res = JNIHandles::make_local(env, result);
3488 if (JvmtiExport::should_post_vm_object_alloc()) {
3489 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3490 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3491 if (java_lang_Class::is_primitive(ret_type)) {
3492 // Only for primitive type vm allocates memory for java object.
3493 // See box() method.
3494 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3495 }
3496 }
3497 return res;
3498 } else {
3499 THROW_0(vmSymbols::java_lang_StackOverflowError());
3500 }
3501 JVM_END
3502
3503
3504 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3505 JVMWrapper("JVM_NewInstanceFromConstructor");
3506 oop constructor_mirror = JNIHandles::resolve(c);
3507 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3508 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3509 jobject res = JNIHandles::make_local(env, result);
3510 if (JvmtiExport::should_post_vm_object_alloc()) {
3511 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3512 }
3513 return res;
3514 JVM_END
3515
3516 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3517
3518 JVM_LEAF(jboolean, JVM_SupportsCX8())
3519 JVMWrapper("JVM_SupportsCX8");
3520 return VM_Version::supports_cx8();
3521 JVM_END
3522
3523 // DTrace ///////////////////////////////////////////////////////////////////
3524
3525 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env))
3526 JVMWrapper("JVM_DTraceGetVersion");
3527 return (jint)JVM_TRACING_DTRACE_VERSION;
3528 JVM_END
3529
3530 JVM_ENTRY(jlong,JVM_DTraceActivate(
3531 JNIEnv* env, jint version, jstring module_name, jint providers_count,
3532 JVM_DTraceProvider* providers))
3533 JVMWrapper("JVM_DTraceActivate");
3534 return DTraceJSDT::activate(
3535 version, module_name, providers_count, providers, THREAD);
3536 JVM_END
3537
3538 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method))
3539 JVMWrapper("JVM_DTraceIsProbeEnabled");
3540 return DTraceJSDT::is_probe_enabled(method);
3541 JVM_END
3542
3543 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle))
3544 JVMWrapper("JVM_DTraceDispose");
3545 DTraceJSDT::dispose(handle);
3546 JVM_END
3547
3548 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env))
3549 JVMWrapper("JVM_DTraceIsSupported");
3550 return DTraceJSDT::is_supported();
3551 JVM_END
3552
3553 // Returns an array of all live Thread objects (VM internal JavaThreads,
3554 // jvmti agent threads, and JNI attaching threads are skipped)
3555 // See CR 6404306 regarding JNI attaching threads
3556 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3557 ResourceMark rm(THREAD);
3558 ThreadsListEnumerator tle(THREAD, false, false);
3559 JvmtiVMObjectAllocEventCollector oam;
3560
3561 int num_threads = tle.num_threads();
3562 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3563 objArrayHandle threads_ah(THREAD, r);
3564
3565 for (int i = 0; i < num_threads; i++) {
3566 Handle h = tle.get_threadObj(i);
3567 threads_ah->obj_at_put(i, h());
3568 }
3569
3570 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3571 JVM_END
3572
3573
3574 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3575 // Return StackTraceElement[][], each element is the stack trace of a thread in
3576 // the corresponding entry in the given threads array
3577 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3578 JVMWrapper("JVM_DumpThreads");
3579 JvmtiVMObjectAllocEventCollector oam;
3580
3581 // Check if threads is null
3582 if (threads == NULL) {
3583 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3584 }
3585
3586 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3587 objArrayHandle ah(THREAD, a);
3588 int num_threads = ah->length();
3589 // check if threads is non-empty array
3590 if (num_threads == 0) {
3591 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3592 }
3593
3594 // check if threads is not an array of objects of Thread class
3595 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3596 if (k != SystemDictionary::Thread_klass()) {
3597 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3598 }
3599
3600 ResourceMark rm(THREAD);
3601
3602 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3603 for (int i = 0; i < num_threads; i++) {
3604 oop thread_obj = ah->obj_at(i);
3605 instanceHandle h(THREAD, (instanceOop) thread_obj);
3606 thread_handle_array->append(h);
3607 }
3608
3609 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3610 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3611
3612 JVM_END
3613
3614 // JVM monitoring and management support
3615 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3616 return Management::get_jmm_interface(version);
3617 JVM_END
3618
3619 // com.sun.tools.attach.VirtualMachine agent properties support
3620 //
3621 // Initialize the agent properties with the properties maintained in the VM
3622 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3623 JVMWrapper("JVM_InitAgentProperties");
3624 ResourceMark rm;
3625
3626 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3627
3628 PUTPROP(props, "sun.java.command", Arguments::java_command());
3629 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3630 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3631 return properties;
3632 JVM_END
3633
3634 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3635 {
3636 JVMWrapper("JVM_GetEnclosingMethodInfo");
3637 JvmtiVMObjectAllocEventCollector oam;
3638
3639 if (ofClass == NULL) {
3640 return NULL;
3641 }
3642 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3643 // Special handling for primitive objects
3644 if (java_lang_Class::is_primitive(mirror())) {
3645 return NULL;
3646 }
3647 Klass* k = java_lang_Class::as_Klass(mirror());
3648 if (!k->oop_is_instance()) {
3649 return NULL;
3650 }
3651 instanceKlassHandle ik_h(THREAD, k);
3652 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3653 if (encl_method_class_idx == 0) {
3654 return NULL;
3655 }
3656 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3657 objArrayHandle dest(THREAD, dest_o);
3658 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3659 dest->obj_at_put(0, enc_k->java_mirror());
3660 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3661 if (encl_method_method_idx != 0) {
3662 Symbol* sym = ik_h->constants()->symbol_at(
3663 extract_low_short_from_int(
3664 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3665 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3666 dest->obj_at_put(1, str());
3667 sym = ik_h->constants()->symbol_at(
3668 extract_high_short_from_int(
3669 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3670 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3671 dest->obj_at_put(2, str());
3672 }
3673 return (jobjectArray) JNIHandles::make_local(dest());
3674 }
3675 JVM_END
3676
3677 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3678 {
3679 memset(info, 0, info_size);
3680
3681 info->jvm_version = Abstract_VM_Version::jvm_version();
3682 info->update_version = 0; /* 0 in HotSpot Express VM */
3683 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3684
3685 // when we add a new capability in the jvm_version_info struct, we should also
3686 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3687 // counter defined in runtimeService.cpp.
3688 info->is_attachable = AttachListener::is_attach_supported();
3689 }
3690 JVM_END