1 /*
2 * Copyright (c) 2003, 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 #ifndef SHARE_VM_PRIMS_JVMTIENVBASE_HPP
26 #define SHARE_VM_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 "prims/jvmtiThreadState.inline.hpp"
33 #include "runtime/fieldDescriptor.hpp"
34 #include "runtime/frame.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/thread.hpp"
37 #include "runtime/vm_operations.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 void set_phase(jvmtiPhase phase) { _phase = phase; }
79 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; }
80
81 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; }
82 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; }
83 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; }
84
85 private:
86
87 enum {
88 JVMTI_MAGIC = 0x71EE,
89 DISPOSED_MAGIC = 0xDEFC,
90 BAD_MAGIC = 0xDEAD
91 };
92
93 jvmtiEnv _jvmti_external;
94 jint _magic;
95 jint _version; // version value passed to JNI GetEnv()
96 JvmtiEnvBase* _next;
97 bool _is_retransformable;
98 const void *_env_local_storage; // per env agent allocated data.
99 jvmtiEventCallbacks _event_callbacks;
100 jvmtiExtEventCallbacks _ext_event_callbacks;
101 JvmtiTagMap* _tag_map;
102 JvmtiEnvEventEnable _env_event_enable;
103 jvmtiCapabilities _current_capabilities;
104 jvmtiCapabilities _prohibited_capabilities;
105 volatile bool _class_file_load_hook_ever_enabled;
106 static volatile bool _needs_clean_up;
107 char** _native_method_prefixes;
108 int _native_method_prefix_count;
109
110 protected:
111 JvmtiEnvBase(jint version);
112 ~JvmtiEnvBase();
113 void dispose();
114 void env_dispose();
115
116 void set_env_local_storage(const void* data) { _env_local_storage = data; }
117 const void* get_env_local_storage() { return _env_local_storage; }
118
119 void record_class_file_load_hook_enabled();
120 void record_first_time_class_file_load_hook_enabled();
121
122 char** get_native_method_prefixes() { return _native_method_prefixes; }
123 int get_native_method_prefix_count() { return _native_method_prefix_count; }
124 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes);
125
126 private:
127 friend class JvmtiEventControllerPrivate;
128 void initialize();
129 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks);
130 static void globally_initialize();
131 static void periodic_clean_up();
132
133 friend class JvmtiEnvIterator;
134 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; }
135 void set_next_environment(JvmtiEnvBase* env) { _next = env; }
136 static JvmtiEnv* head_environment() {
137 JVMTI_ONLY(return (JvmtiEnv*)_head_environment);
138 NOT_JVMTI(return NULL);
139 }
140
141 public:
142
143 bool is_valid();
144
145 bool use_version_1_0_semantics(); // agent asked for version 1.0
146 bool use_version_1_1_semantics(); // agent asked for version 1.1
147 bool use_version_1_2_semantics(); // agent asked for version 1.2
148
149 bool is_retransformable() { return _is_retransformable; }
150
151 static ByteSize jvmti_external_offset() {
152 return byte_offset_of(JvmtiEnvBase, _jvmti_external);
153 };
154
155 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) {
156 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset()));
157 };
158
159 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; }
160
161 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; }
162
163 static char** get_all_native_method_prefixes(int* count_ptr);
164
165 // This test will answer true when all environments have been disposed and some have
166 // not yet been deallocated. As a result, this test should only be used as an
167 // optimization for the no environment case.
168 static bool environments_might_exist() {
169 return head_environment() != NULL;
170 }
171
172 static void check_for_periodic_clean_up();
173
174 JvmtiEnvEventEnable *env_event_enable() {
175 return &_env_event_enable;
176 }
177
178 jvmtiError allocate(jlong size, unsigned char** mem_ptr) {
179 if (size < 0) {
180 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
181 }
182 if (size == 0) {
183 *mem_ptr = NULL;
184 } else {
185 *mem_ptr = (unsigned char *)os::malloc((size_t)size, mtInternal);
186 if (*mem_ptr == NULL) {
187 return JVMTI_ERROR_OUT_OF_MEMORY;
188 }
189 }
190 return JVMTI_ERROR_NONE;
191 }
192
193 jvmtiError deallocate(unsigned char* mem) {
194 if (mem != NULL) {
195 os::free(mem, mtInternal);
196 }
197 return JVMTI_ERROR_NONE;
198 }
199
200
201 // Memory functions
202 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate
203
204 // method to create a local handle
205 jobject jni_reference(Handle hndl) {
206 return JNIHandles::make_local(hndl());
207 }
208
209 // method to create a local handle.
210 // This function allows caller to specify which
211 // threads local handle table to use.
212 jobject jni_reference(JavaThread *thread, Handle hndl) {
213 return JNIHandles::make_local(thread, hndl());
214 }
215
216 // method to destroy a local handle
217 void destroy_jni_reference(jobject jobj) {
218 JNIHandles::destroy_local(jobj);
219 }
220
221 // method to destroy a local handle.
222 // This function allows caller to specify which
223 // threads local handle table to use although currently it is
224 // not used.
225 void destroy_jni_reference(JavaThread *thread, jobject jobj) {
226 destroy_jni_reference(jobj);
227 }
228
229 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
230
231 // Event Dispatch
232
233 bool has_callback(jvmtiEvent event_type) {
234 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
235 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
236 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
237 }
238
239 jvmtiEventCallbacks* callbacks() {
240 return &_event_callbacks;
241 }
242
243 jvmtiExtEventCallbacks* ext_callbacks() {
244 return &_ext_event_callbacks;
245 }
246
247 void set_tag_map(JvmtiTagMap* tag_map) {
248 _tag_map = tag_map;
249 }
250
251 JvmtiTagMap* tag_map() {
252 return _tag_map;
253 }
254
255
256 // return true if event is enabled globally or for any thread
257 // True only if there is a callback for it.
258 bool is_enabled(jvmtiEvent event_type) {
259 return _env_event_enable.is_enabled(event_type);
260 }
261
262 // Random Utilities
263
264 protected:
265 // helper methods for creating arrays of global JNI Handles from local Handles
266 // allocated into environment specific storage
267 jobject * new_jobjectArray(int length, Handle *handles);
268 jthread * new_jthreadArray(int length, Handle *handles);
269 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
270
271 // convert from JNIHandle to JavaThread *
272 JavaThread * get_JavaThread(jthread jni_thread);
273
274 // convert to a jni jclass from a non-null Klass*
275 jclass get_jni_class_non_null(Klass* k);
276
277 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
278 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
279 JavaThread* java_thread,
280 javaVFrame *jvf,
281 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
282 jint depth);
283 vframe* vframeFor(JavaThread* java_thread, jint depth);
284
285 public:
286 // get a field descriptor for the specified class and field
287 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd);
288 // test for suspend - most (all?) of these should go away
289 static bool is_thread_fully_suspended(JavaThread *thread,
290 bool wait_for_suspend,
291 uint32_t *bits);
292
293
294 // JVMTI API helper functions which are called at safepoint or thread is suspended.
295 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
296 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
297 jmethodID* method_ptr, jlocation* location_ptr);
298 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
299 jobject object, jvmtiMonitorUsage* info_ptr);
300 jvmtiError get_stack_trace(JavaThread *java_thread,
301 jint stack_depth, jint max_count,
302 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
303 jvmtiError get_current_contended_monitor(JavaThread *calling_thread,
304 JavaThread *java_thread,
305 jobject *monitor_ptr);
306 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
307 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
308 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
309 jvalue value, TosState tos, Handle* ret_ob_h);
310 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
311 };
312
313 // This class is the only safe means of iterating through environments.
314 // Note that this iteratation includes invalid environments pending
315 // deallocation -- in fact, some uses depend on this behavior.
316
317 class JvmtiEnvIterator : public StackObj {
318 private:
319 bool _entry_was_marked;
320 public:
321 JvmtiEnvIterator() {
322 if (Threads::number_of_threads() == 0) {
323 _entry_was_marked = false; // we are single-threaded, no need
324 } else {
325 Thread::current()->entering_jvmti_env_iteration();
326 _entry_was_marked = true;
327 }
328 }
329 ~JvmtiEnvIterator() {
330 if (_entry_was_marked) {
331 Thread::current()->leaving_jvmti_env_iteration();
332 }
333 }
334 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
335 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
336 };
337
338 // VM operation to update for pop top frame.
339 class VM_UpdateForPopTopFrame : public VM_Operation {
340 private:
341 JvmtiThreadState* _state;
342 jvmtiError _result;
343
344 public:
345 VM_UpdateForPopTopFrame(JvmtiThreadState* state) {
346 _state = state;
347 _result = JVMTI_ERROR_NONE;
348 }
349 VMOp_Type type() const { return VMOp_UpdateForPopTopFrame; }
350 jvmtiError result() { return _result; }
351 void doit() {
352 JavaThread* jt = _state->get_thread();
353 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
354 _state->update_for_pop_top_frame();
355 } else {
356 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
357 }
358 }
359 };
360
361 // VM operation to set frame pop.
362 class VM_SetFramePop : public VM_Operation {
363 private:
364 JvmtiEnv *_env;
365 JvmtiThreadState* _state;
366 jint _depth;
367 jvmtiError _result;
368
369 public:
370 VM_SetFramePop(JvmtiEnv *env, JvmtiThreadState* state, jint depth) {
371 _env = env;
372 _state = state;
373 _depth = depth;
374 _result = JVMTI_ERROR_NONE;
375 }
376 // Nested operation must be allowed for the VM_EnterInterpOnlyMode that is
377 // called from the JvmtiEventControllerPrivate::recompute_thread_enabled.
378 bool allow_nested_vm_operations() const { return true; }
379 VMOp_Type type() const { return VMOp_SetFramePop; }
380 jvmtiError result() { return _result; }
381 void doit() {
382 JavaThread* jt = _state->get_thread();
383 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
384 int frame_number = _state->count_frames() - _depth;
385 _state->env_thread_state((JvmtiEnvBase*)_env)->set_frame_pop(frame_number);
386 } else {
387 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
388 }
389 }
390 };
391
392
393 // VM operation to get monitor information with stack depth.
394 class VM_GetOwnedMonitorInfo : public VM_Operation {
395 private:
396 JvmtiEnv *_env;
397 JavaThread* _calling_thread;
398 JavaThread *_java_thread;
399 jvmtiError _result;
400 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
401
402 public:
403 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread,
404 JavaThread* java_thread,
405 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) {
406 _env = env;
407 _calling_thread = calling_thread;
408 _java_thread = java_thread;
409 _owned_monitors_list = owned_monitor_list;
410 _result = JVMTI_ERROR_NONE;
411 }
412 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; }
413 void doit() {
414 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
415 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
416 && _java_thread->threadObj() != NULL) {
417 _result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
418 _owned_monitors_list);
419 }
420 }
421 jvmtiError result() { return _result; }
422 };
423
424
425 // VM operation to get object monitor usage.
426 class VM_GetObjectMonitorUsage : public VM_Operation {
427 private:
428 JvmtiEnv *_env;
429 jobject _object;
430 JavaThread* _calling_thread;
431 jvmtiMonitorUsage* _info_ptr;
432 jvmtiError _result;
433
434 public:
435 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
436 _env = env;
437 _object = object;
438 _calling_thread = calling_thread;
439 _info_ptr = info_ptr;
440 }
441 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
442 jvmtiError result() { return _result; }
443 void doit() {
444 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
445 }
446
447 };
448
449 // VM operation to get current contended monitor.
450 class VM_GetCurrentContendedMonitor : public VM_Operation {
451 private:
452 JvmtiEnv *_env;
453 JavaThread *_calling_thread;
454 JavaThread *_java_thread;
455 jobject *_owned_monitor_ptr;
456 jvmtiError _result;
457
458 public:
459 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) {
460 _env = env;
461 _calling_thread = calling_thread;
462 _java_thread = java_thread;
463 _owned_monitor_ptr = mon_ptr;
464 }
465 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; }
466 jvmtiError result() { return _result; }
467 void doit() {
468 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
469 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
470 _java_thread->threadObj() != NULL) {
471 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
472 }
473 }
474 };
475
476 // VM operation to get stack trace at safepoint.
477 class VM_GetStackTrace : public VM_Operation {
478 private:
479 JvmtiEnv *_env;
480 JavaThread *_java_thread;
481 jint _start_depth;
482 jint _max_count;
483 jvmtiFrameInfo *_frame_buffer;
484 jint *_count_ptr;
485 jvmtiError _result;
486
487 public:
488 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread,
489 jint start_depth, jint max_count,
490 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
491 _env = env;
492 _java_thread = java_thread;
493 _start_depth = start_depth;
494 _max_count = max_count;
495 _frame_buffer = frame_buffer;
496 _count_ptr = count_ptr;
497 }
498 jvmtiError result() { return _result; }
499 VMOp_Type type() const { return VMOp_GetStackTrace; }
500 void doit() {
501 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
502 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
503 && _java_thread->threadObj() != NULL) {
504 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
505 _start_depth, _max_count,
506 _frame_buffer, _count_ptr);
507 }
508 }
509 };
510
511 // forward declaration
512 struct StackInfoNode;
513
514 // VM operation to get stack trace at safepoint.
515 class VM_GetMultipleStackTraces : public VM_Operation {
516 private:
517 JvmtiEnv *_env;
518 jint _max_frame_count;
519 jvmtiStackInfo *_stack_info;
520 jvmtiError _result;
521 int _frame_count_total;
522 struct StackInfoNode *_head;
523
524 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
525 jint max_frame_count() { return _max_frame_count; }
526 struct StackInfoNode *head() { return _head; }
527 void set_head(StackInfoNode *head) { _head = head; }
528
529 protected:
530 void set_result(jvmtiError result) { _result = result; }
531 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
532 void allocate_and_fill_stacks(jint thread_count);
533
534 public:
535 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) {
536 _env = env;
537 _max_frame_count = max_frame_count;
538 _frame_count_total = 0;
539 _head = NULL;
540 _result = JVMTI_ERROR_NONE;
541 }
542 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; }
543 jvmtiStackInfo *stack_info() { return _stack_info; }
544 jvmtiError result() { return _result; }
545 };
546
547
548 // VM operation to get stack trace at safepoint.
549 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces {
550 private:
551 JavaThread *_calling_thread;
552 jint _final_thread_count;
553
554 public:
555 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
556 jint max_frame_count)
557 : VM_GetMultipleStackTraces(env, max_frame_count) {
558 _calling_thread = calling_thread;
559 }
560 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
561 void doit();
562 jint final_thread_count() { return _final_thread_count; }
563 };
564
565 // VM operation to get stack trace at safepoint.
566 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces {
567 private:
568 jint _thread_count;
569 const jthread* _thread_list;
570
571 public:
572 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
573 : VM_GetMultipleStackTraces(env, max_frame_count) {
574 _thread_count = thread_count;
575 _thread_list = thread_list;
576 }
577 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
578 void doit();
579 };
580
581
582 // VM operation to count stack frames at safepoint.
583 class VM_GetFrameCount : public VM_Operation {
584 private:
585 JvmtiEnv *_env;
586 JvmtiThreadState *_state;
587 jint *_count_ptr;
588 jvmtiError _result;
589
590 public:
591 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) {
592 _env = env;
593 _state = state;
594 _count_ptr = count_ptr;
595 }
596 VMOp_Type type() const { return VMOp_GetFrameCount; }
597 jvmtiError result() { return _result; }
598 void doit() {
599 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
600 JavaThread* jt = _state->get_thread();
601 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
602 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
603 }
604 }
605 };
606
607 // VM operation to frame location at safepoint.
608 class VM_GetFrameLocation : public VM_Operation {
609 private:
610 JvmtiEnv *_env;
611 JavaThread* _java_thread;
612 jint _depth;
613 jmethodID* _method_ptr;
614 jlocation* _location_ptr;
615 jvmtiError _result;
616
617 public:
618 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth,
619 jmethodID* method_ptr, jlocation* location_ptr) {
620 _env = env;
621 _java_thread = java_thread;
622 _depth = depth;
623 _method_ptr = method_ptr;
624 _location_ptr = location_ptr;
625 }
626 VMOp_Type type() const { return VMOp_GetFrameLocation; }
627 jvmtiError result() { return _result; }
628 void doit() {
629 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
630 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
631 _java_thread->threadObj() != NULL) {
632 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
633 _method_ptr, _location_ptr);
634 }
635 }
636 };
637
638
639 // ResourceTracker
640 //
641 // ResourceTracker works a little like a ResourceMark. All allocates
642 // using the resource tracker are recorded. If an allocate using the
643 // resource tracker fails the destructor will free any resources
644 // that were allocated using the tracker.
645 // The motive for this class is to avoid messy error recovery code
646 // in situations where multiple allocations are done in sequence. If
647 // the second or subsequent allocation fails it avoids any code to
648 // release memory allocated in the previous calls.
649 //
650 // Usage :-
651 // ResourceTracker rt(env);
652 // :
653 // err = rt.allocate(1024, &ptr);
654
655 class ResourceTracker : public StackObj {
656 private:
657 JvmtiEnv* _env;
658 GrowableArray<unsigned char*> *_allocations;
659 bool _failed;
660 public:
661 ResourceTracker(JvmtiEnv* env);
662 ~ResourceTracker();
663 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
664 unsigned char* allocate(jlong size);
665 char* strdup(const char* str);
666 };
667
668
669 // Jvmti monitor closure to collect off stack monitors.
670 class JvmtiMonitorClosure: public MonitorClosure {
671 private:
672 JavaThread *_java_thread;
673 JavaThread *_calling_thread;
674 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
675 jvmtiError _error;
676 JvmtiEnvBase *_env;
677
678 public:
679 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
680 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
681 JvmtiEnvBase *env) {
682 _java_thread = thread;
683 _calling_thread = calling_thread;
684 _owned_monitors_list = owned_monitors;
685 _error = JVMTI_ERROR_NONE;
686 _env = env;
687 }
688 void do_monitor(ObjectMonitor* mon);
689 jvmtiError error() { return _error;}
690 };
691
692 #endif // SHARE_VM_PRIMS_JVMTIENVBASE_HPP