1 /*
2 * Copyright (c) 2003, 2020, 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 #ifndef SHARE_PRIMS_JVMTIENVBASE_HPP
26 #define SHARE_PRIMS_JVMTIENVBASE_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "prims/jvmtiEnvThreadState.hpp"
30 #include "prims/jvmtiEventController.hpp"
31 #include "prims/jvmtiThreadState.hpp"
32 #include "oops/oopHandle.hpp"
33 #include "runtime/atomic.hpp"
34 #include "runtime/fieldDescriptor.hpp"
35 #include "runtime/frame.hpp"
36 #include "runtime/thread.hpp"
37 #include "runtime/vmOperations.hpp"
38 #include "utilities/growableArray.hpp"
39 #include "utilities/macros.hpp"
40
41 //
42 // Forward Declarations
43 //
44
45 class JvmtiEnv;
46 class JvmtiThreadState;
47 class JvmtiRawMonitor; // for jvmtiEnv.hpp
48 class JvmtiEventControllerPrivate;
49 class JvmtiTagMap;
50
51
52
53 // One JvmtiEnv object is created per jvmti attachment;
54 // done via JNI GetEnv() call. Multiple attachments are
55 // allowed in jvmti.
56
57 class JvmtiEnvBase : public CHeapObj<mtInternal> {
58
59 private:
60
61 #if INCLUDE_JVMTI
62 static JvmtiEnvBase* _head_environment; // head of environment list
63 #endif // INCLUDE_JVMTI
64
65 static bool _globally_initialized;
66 static jvmtiPhase _phase;
67 static volatile int _dying_thread_env_iteration_count;
68
69 public:
70
71 enum {
72 JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */
73 JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102, /* version: 1.1.102 */
74 JDK17_JVMTI_VERSION = JVMTI_VERSION_1_2 + 2 /* version: 1.2.2 */
75 };
76
77 static jvmtiPhase get_phase() { return _phase; }
78 static jvmtiPhase get_phase(jvmtiEnv* env) { return ((JvmtiEnvBase*)JvmtiEnv_from_jvmti_env(env))->phase(); }
79 static void set_phase(jvmtiPhase phase) { _phase = phase; }
80 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; }
81
82 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; }
83 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; }
84 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; }
85
86 private:
87
88 enum {
89 JVMTI_MAGIC = 0x71EE,
90 DISPOSED_MAGIC = 0xDEFC,
91 BAD_MAGIC = 0xDEAD
92 };
93
94 jvmtiEnv _jvmti_external;
95 jint _magic;
96 jint _version; // version value passed to JNI GetEnv()
97 JvmtiEnvBase* _next;
98 bool _is_retransformable;
99 const void *_env_local_storage; // per env agent allocated data.
100 jvmtiEventCallbacks _event_callbacks;
101 jvmtiExtEventCallbacks _ext_event_callbacks;
102 JvmtiTagMap* volatile _tag_map;
103 JvmtiEnvEventEnable _env_event_enable;
104 jvmtiCapabilities _current_capabilities;
105 jvmtiCapabilities _prohibited_capabilities;
106 volatile bool _class_file_load_hook_ever_enabled;
107 static volatile bool _needs_clean_up;
108 char** _native_method_prefixes;
109 int _native_method_prefix_count;
110
111 protected:
112 JvmtiEnvBase(jint version);
113 ~JvmtiEnvBase();
114 void dispose();
115 void env_dispose();
116
117 void set_env_local_storage(const void* data) { _env_local_storage = data; }
118 const void* get_env_local_storage() { return _env_local_storage; }
119
120 void record_class_file_load_hook_enabled();
121 void record_first_time_class_file_load_hook_enabled();
122
123 char** get_native_method_prefixes() { return _native_method_prefixes; }
124 int get_native_method_prefix_count() { return _native_method_prefix_count; }
125 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes);
126
127 private:
128 friend class JvmtiEventControllerPrivate;
129 void initialize();
130 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks);
131 static void globally_initialize();
132 static void periodic_clean_up();
133
134 friend class JvmtiEnvIterator;
135 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; }
136 void set_next_environment(JvmtiEnvBase* env) { _next = env; }
137 static JvmtiEnv* head_environment() {
138 JVMTI_ONLY(return (JvmtiEnv*)_head_environment);
139 NOT_JVMTI(return NULL);
140 }
141
142 public:
143
144 jvmtiPhase phase();
145 bool is_valid();
146
147 bool use_version_1_0_semantics(); // agent asked for version 1.0
148 bool use_version_1_1_semantics(); // agent asked for version 1.1
149 bool use_version_1_2_semantics(); // agent asked for version 1.2
150
151 bool is_retransformable() { return _is_retransformable; }
152
153 static ByteSize jvmti_external_offset() {
154 return byte_offset_of(JvmtiEnvBase, _jvmti_external);
155 };
156
157 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) {
158 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset()));
159 };
160
161 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; }
162
163 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; }
164
165 bool early_class_hook_env() {
166 return get_capabilities()->can_generate_early_class_hook_events != 0
167 && get_capabilities()->can_generate_all_class_hook_events != 0;
168 }
169
170 bool early_vmstart_env() {
171 return get_capabilities()->can_generate_early_vmstart != 0;
172 }
173
174 static char** get_all_native_method_prefixes(int* count_ptr);
175
176 // This test will answer true when all environments have been disposed and some have
177 // not yet been deallocated. As a result, this test should only be used as an
178 // optimization for the no environment case.
179 static bool environments_might_exist() {
180 return head_environment() != NULL;
181 }
182
183 static void check_for_periodic_clean_up();
184
185 JvmtiEnvEventEnable *env_event_enable() {
186 return &_env_event_enable;
187 }
188
189 jvmtiError allocate(jlong size, unsigned char** mem_ptr) {
190 if (size < 0) {
191 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
192 }
193 if (size == 0) {
194 *mem_ptr = NULL;
195 } else {
196 *mem_ptr = (unsigned char *)os::malloc((size_t)size, mtInternal);
197 if (*mem_ptr == NULL) {
198 return JVMTI_ERROR_OUT_OF_MEMORY;
199 }
200 }
201 return JVMTI_ERROR_NONE;
202 }
203
204 jvmtiError deallocate(unsigned char* mem) {
205 if (mem != NULL) {
206 os::free(mem);
207 }
208 return JVMTI_ERROR_NONE;
209 }
210
211
212 // Memory functions
213 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate
214
215 // method to create a local handle
216 jobject jni_reference(Handle hndl);
217
218 // method to create a local handle.
219 // This function allows caller to specify which
220 // threads local handle table to use.
221 jobject jni_reference(JavaThread *thread, Handle hndl);
222
223 // method to destroy a local handle
224 void destroy_jni_reference(jobject jobj);
225
226 // method to destroy a local handle.
227 // This function allows caller to specify which
228 // threads local handle table to use.
229 void destroy_jni_reference(JavaThread *thread, jobject jobj);
230
231 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
232
233 // Event Dispatch
234
235 bool has_callback(jvmtiEvent event_type) {
236 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
237 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
238 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
239 }
240
241 jvmtiEventCallbacks* callbacks() {
242 return &_event_callbacks;
243 }
244
245 jvmtiExtEventCallbacks* ext_callbacks() {
246 return &_ext_event_callbacks;
247 }
248
249 void set_tag_map(JvmtiTagMap* tag_map) {
250 _tag_map = tag_map;
251 }
252
253 JvmtiTagMap* tag_map() {
254 return _tag_map;
255 }
256
257 JvmtiTagMap* tag_map_acquire() {
258 return Atomic::load_acquire(&_tag_map);
259 }
260
261 void release_set_tag_map(JvmtiTagMap* tag_map) {
262 Atomic::release_store(&_tag_map, tag_map);
263 }
264
265 // return true if event is enabled globally or for any thread
266 // True only if there is a callback for it.
267 bool is_enabled(jvmtiEvent event_type) {
268 return _env_event_enable.is_enabled(event_type);
269 }
270
271 // Random Utilities
272
273 protected:
274 // helper methods for creating arrays of global JNI Handles from local Handles
275 // allocated into environment specific storage
276 jobject * new_jobjectArray(int length, Handle *handles);
277 jthread * new_jthreadArray(int length, Handle *handles);
278 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
279
280 // convert to a jni jclass from a non-null Klass*
281 jclass get_jni_class_non_null(Klass* k);
282
283 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
284 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
285 JavaThread* java_thread,
286 javaVFrame *jvf,
287 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
288 jint depth);
289 vframe* vframeFor(JavaThread* java_thread, jint depth);
290
291 public:
292 // get a field descriptor for the specified class and field
293 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd);
294
295 // JVMTI API helper functions which are called when target thread is suspended
296 // or at safepoint / thread local handshake.
297 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
298 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
299 jmethodID* method_ptr, jlocation* location_ptr);
300 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
301 jobject object, jvmtiMonitorUsage* info_ptr);
302 jvmtiError get_stack_trace(JavaThread *java_thread,
303 jint stack_depth, jint max_count,
304 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
305 jvmtiError get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread,
306 jobject *monitor_ptr);
307 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
308 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
309 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
310 jvalue value, TosState tos, Handle* ret_ob_h);
311 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
312 };
313
314 // This class is the only safe means of iterating through environments.
315 // Note that this iteratation includes invalid environments pending
316 // deallocation -- in fact, some uses depend on this behavior.
317
318 class JvmtiEnvIterator : public StackObj {
319 private:
320 bool _entry_was_marked;
321 public:
322 JvmtiEnvIterator() {
323 if (Threads::number_of_threads() == 0) {
324 _entry_was_marked = false; // we are single-threaded, no need
325 } else {
326 Thread::current()->entering_jvmti_env_iteration();
327 _entry_was_marked = true;
328 }
329 }
330 ~JvmtiEnvIterator() {
331 if (_entry_was_marked) {
332 Thread::current()->leaving_jvmti_env_iteration();
333 }
334 }
335 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
336 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
337 };
338
339 // HandshakeClosure to update for pop top frame.
340 class UpdateForPopTopFrameClosure : public HandshakeClosure {
341 private:
342 JvmtiThreadState* _state;
343 jvmtiError _result;
344
345 public:
346 UpdateForPopTopFrameClosure(JvmtiThreadState* state)
347 : HandshakeClosure("UpdateForPopTopFrame"),
348 _state(state),
349 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {}
350 jvmtiError result() { return _result; }
351 void do_thread(Thread *target);
352 };
353
354 // HandshakeClosure to set frame pop.
355 class SetFramePopClosure : public HandshakeClosure {
356 private:
357 JvmtiEnv *_env;
358 JvmtiThreadState* _state;
359 jint _depth;
360 jvmtiError _result;
361
362 public:
363 SetFramePopClosure(JvmtiEnv *env, JvmtiThreadState* state, jint depth)
364 : HandshakeClosure("SetFramePop"),
365 _env(env),
366 _state(state),
367 _depth(depth),
368 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {}
369 jvmtiError result() { return _result; }
370 void do_thread(Thread *target);
371 };
372
373
374 // HandshakeClosure to get monitor information with stack depth.
375 class GetOwnedMonitorInfoClosure : public HandshakeClosure {
376 private:
377 JavaThread* _calling_thread;
378 JvmtiEnv *_env;
379 jvmtiError _result;
380 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
381
382 public:
383 GetOwnedMonitorInfoClosure(JavaThread* calling_thread, JvmtiEnv* env,
384 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list)
385 : HandshakeClosure("GetOwnedMonitorInfo"),
386 _calling_thread(calling_thread),
387 _env(env),
388 _result(JVMTI_ERROR_THREAD_NOT_ALIVE),
389 _owned_monitors_list(owned_monitor_list) {}
390 jvmtiError result() { return _result; }
391 void do_thread(Thread *target);
392 };
393
394
395 // VM operation to get object monitor usage.
396 class VM_GetObjectMonitorUsage : public VM_Operation {
397 private:
398 JvmtiEnv *_env;
399 jobject _object;
400 JavaThread* _calling_thread;
401 jvmtiMonitorUsage* _info_ptr;
402 jvmtiError _result;
403
404 public:
405 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
406 _env = env;
407 _object = object;
408 _calling_thread = calling_thread;
409 _info_ptr = info_ptr;
410 }
411 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
412 jvmtiError result() { return _result; }
413 void doit() {
414 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
415 }
416
417 };
418
419 // HandshakeClosure to get current contended monitor.
420 class GetCurrentContendedMonitorClosure : public HandshakeClosure {
421 private:
422 JavaThread *_calling_thread;
423 JvmtiEnv *_env;
424 jobject *_owned_monitor_ptr;
425 jvmtiError _result;
426
427 public:
428 GetCurrentContendedMonitorClosure(JavaThread* calling_thread, JvmtiEnv *env, jobject *mon_ptr)
429 : HandshakeClosure("GetCurrentContendedMonitor"),
430 _calling_thread(calling_thread),
431 _env(env),
432 _owned_monitor_ptr(mon_ptr),
433 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {}
434 jvmtiError result() { return _result; }
435 void do_thread(Thread *target);
436 };
437
438 // HandshakeClosure to get stack trace.
439 class GetStackTraceClosure : public HandshakeClosure {
440 private:
441 JvmtiEnv *_env;
442 jint _start_depth;
443 jint _max_count;
444 jvmtiFrameInfo *_frame_buffer;
445 jint *_count_ptr;
446 jvmtiError _result;
447
448 public:
449 GetStackTraceClosure(JvmtiEnv *env, jint start_depth, jint max_count,
450 jvmtiFrameInfo* frame_buffer, jint* count_ptr)
451 : HandshakeClosure("GetStackTrace"),
452 _env(env),
453 _start_depth(start_depth),
454 _max_count(max_count),
455 _frame_buffer(frame_buffer),
456 _count_ptr(count_ptr),
457 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {
458 }
459 jvmtiError result() { return _result; }
460 void do_thread(Thread *target);
461 };
462
463 // forward declaration
464 struct StackInfoNode;
465
466 // Get stack trace at safepoint or at direct handshake.
467 class MultipleStackTracesCollector {
468 private:
469 JvmtiEnv *_env;
470 jint _max_frame_count;
471 jvmtiStackInfo *_stack_info;
472 jvmtiError _result;
473 int _frame_count_total;
474 struct StackInfoNode *_head;
475
476 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
477 jint max_frame_count() { return _max_frame_count; }
478 struct StackInfoNode *head() { return _head; }
479 void set_head(StackInfoNode *head) { _head = head; }
480
481 public:
482 MultipleStackTracesCollector(JvmtiEnv *env, jint max_frame_count)
483 : _env(env),
484 _max_frame_count(max_frame_count),
485 _stack_info(NULL),
486 _result(JVMTI_ERROR_NONE),
487 _frame_count_total(0),
488 _head(NULL) {
489 }
490 void set_result(jvmtiError result) { _result = result; }
491 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
492 void allocate_and_fill_stacks(jint thread_count);
493 jvmtiStackInfo *stack_info() { return _stack_info; }
494 jvmtiError result() { return _result; }
495 };
496
497
498 // VM operation to get stack trace at safepoint.
499 class VM_GetAllStackTraces : public VM_Operation {
500 private:
501 JavaThread *_calling_thread;
502 jint _final_thread_count;
503 MultipleStackTracesCollector _collector;
504
505 public:
506 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
507 jint max_frame_count)
508 : _calling_thread(calling_thread),
509 _final_thread_count(0),
510 _collector(env, max_frame_count) {
511 }
512 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
513 void doit();
514 jint final_thread_count() { return _final_thread_count; }
515 jvmtiStackInfo *stack_info() { return _collector.stack_info(); }
516 jvmtiError result() { return _collector.result(); }
517 };
518
519 // VM operation to get stack trace at safepoint.
520 class VM_GetThreadListStackTraces : public VM_Operation {
521 private:
522 jint _thread_count;
523 const jthread* _thread_list;
524 MultipleStackTracesCollector _collector;
525
526 public:
527 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
528 : _thread_count(thread_count),
529 _thread_list(thread_list),
530 _collector(env, max_frame_count) {
531 }
532 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
533 void doit();
534 jvmtiStackInfo *stack_info() { return _collector.stack_info(); }
535 jvmtiError result() { return _collector.result(); }
536 };
537
538 // HandshakeClosure to get single stack trace.
539 class GetSingleStackTraceClosure : public HandshakeClosure {
540 private:
541 JavaThread *_calling_thread;
542 jthread _jthread;
543 MultipleStackTracesCollector _collector;
544
545 public:
546 GetSingleStackTraceClosure(JvmtiEnv *env, JavaThread *calling_thread,
547 jthread thread, jint max_frame_count)
548 : HandshakeClosure("GetSingleStackTrace"),
549 _calling_thread(calling_thread),
550 _jthread(thread),
551 _collector(env, max_frame_count) {
552 }
553 void do_thread(Thread *target);
554 jvmtiStackInfo *stack_info() { return _collector.stack_info(); }
555 jvmtiError result() { return _collector.result(); }
556 };
557
558 // HandshakeClosure to count stack frames.
559 class GetFrameCountClosure : public HandshakeClosure {
560 private:
561 JvmtiEnv *_env;
562 JvmtiThreadState *_state;
563 jint *_count_ptr;
564 jvmtiError _result;
565
566 public:
567 GetFrameCountClosure(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr)
568 : HandshakeClosure("GetFrameCount"),
569 _env(env),
570 _state(state),
571 _count_ptr(count_ptr),
572 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {
573 }
574 jvmtiError result() { return _result; }
575 void do_thread(Thread *target);
576 };
577
578 // HandshakeClosure to get frame location.
579 class GetFrameLocationClosure : public HandshakeClosure {
580 private:
581 JvmtiEnv *_env;
582 jint _depth;
583 jmethodID* _method_ptr;
584 jlocation* _location_ptr;
585 jvmtiError _result;
586
587 public:
588 GetFrameLocationClosure(JvmtiEnv *env, jint depth,
589 jmethodID* method_ptr, jlocation* location_ptr)
590 : HandshakeClosure("GetFrameLocation"),
591 _env(env),
592 _depth(depth),
593 _method_ptr(method_ptr),
594 _location_ptr(location_ptr),
595 _result(JVMTI_ERROR_THREAD_NOT_ALIVE) {
596 }
597 jvmtiError result() { return _result; }
598 void do_thread(Thread *target);
599 };
600
601
602 // ResourceTracker
603 //
604 // ResourceTracker works a little like a ResourceMark. All allocates
605 // using the resource tracker are recorded. If an allocate using the
606 // resource tracker fails the destructor will free any resources
607 // that were allocated using the tracker.
608 // The motive for this class is to avoid messy error recovery code
609 // in situations where multiple allocations are done in sequence. If
610 // the second or subsequent allocation fails it avoids any code to
611 // release memory allocated in the previous calls.
612 //
613 // Usage :-
614 // ResourceTracker rt(env);
615 // :
616 // err = rt.allocate(1024, &ptr);
617
618 class ResourceTracker : public StackObj {
619 private:
620 JvmtiEnv* _env;
621 GrowableArray<unsigned char*> *_allocations;
622 bool _failed;
623 public:
624 ResourceTracker(JvmtiEnv* env);
625 ~ResourceTracker();
626 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
627 unsigned char* allocate(jlong size);
628 char* strdup(const char* str);
629 };
630
631
632 // Jvmti monitor closure to collect off stack monitors.
633 class JvmtiMonitorClosure: public MonitorClosure {
634 private:
635 JavaThread *_java_thread;
636 JavaThread *_calling_thread;
637 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
638 jvmtiError _error;
639 JvmtiEnvBase *_env;
640
641 public:
642 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
643 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
644 JvmtiEnvBase *env) {
645 _java_thread = thread;
646 _calling_thread = calling_thread;
647 _owned_monitors_list = owned_monitors;
648 _error = JVMTI_ERROR_NONE;
649 _env = env;
650 }
651 void do_monitor(ObjectMonitor* mon);
652 jvmtiError error() { return _error;}
653 };
654
655
656 // Jvmti module closure to collect all modules loaded to the system.
657 class JvmtiModuleClosure : public StackObj {
658 private:
659 static GrowableArray<OopHandle> *_tbl; // Protected with Module_lock
660
661 static void do_module(ModuleEntry* entry);
662 public:
663 jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr);
664 };
665
666 #endif // SHARE_PRIMS_JVMTIENVBASE_HPP