1 /*
2 * Copyright (c) 2003, 2017, 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 "oops/oopHandle.hpp"
34 #include "runtime/fieldDescriptor.hpp"
35 #include "runtime/frame.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/thread.hpp"
38 #include "runtime/vm_operations.hpp"
39 #include "utilities/growableArray.hpp"
40 #include "utilities/macros.hpp"
41
42 //
43 // Forward Declarations
44 //
45
46 class JvmtiEnv;
47 class JvmtiThreadState;
48 class JvmtiRawMonitor; // for jvmtiEnv.hpp
49 class JvmtiEventControllerPrivate;
50 class JvmtiTagMap;
51
52
53
54 // One JvmtiEnv object is created per jvmti attachment;
55 // done via JNI GetEnv() call. Multiple attachments are
56 // allowed in jvmti.
57
58 class JvmtiEnvBase : public CHeapObj<mtInternal> {
59
60 private:
61
62 #if INCLUDE_JVMTI
63 static JvmtiEnvBase* _head_environment; // head of environment list
64 #endif // INCLUDE_JVMTI
65
66 static bool _globally_initialized;
67 static jvmtiPhase _phase;
68 static volatile int _dying_thread_env_iteration_count;
69
70 public:
71
72 enum {
73 JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */
74 JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102, /* version: 1.1.102 */
75 JDK17_JVMTI_VERSION = JVMTI_VERSION_1_2 + 2 /* version: 1.2.2 */
76 };
77
78 static jvmtiPhase get_phase() { return _phase; }
79 static jvmtiPhase get_phase(jvmtiEnv* env) { return ((JvmtiEnvBase*)JvmtiEnv_from_jvmti_env(env))->phase(); }
80 static void set_phase(jvmtiPhase phase) { _phase = phase; }
81 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; }
82
83 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; }
84 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; }
85 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; }
86
87 private:
88
89 enum {
90 JVMTI_MAGIC = 0x71EE,
91 DISPOSED_MAGIC = 0xDEFC,
92 BAD_MAGIC = 0xDEAD
93 };
94
95 jvmtiEnv _jvmti_external;
96 jint _magic;
97 jint _version; // version value passed to JNI GetEnv()
98 JvmtiEnvBase* _next;
99 bool _is_retransformable;
100 const void *_env_local_storage; // per env agent allocated data.
101 jvmtiEventCallbacks _event_callbacks;
102 jvmtiExtEventCallbacks _ext_event_callbacks;
103 JvmtiTagMap* _tag_map;
104 JvmtiEnvEventEnable _env_event_enable;
105 jvmtiCapabilities _current_capabilities;
106 jvmtiCapabilities _prohibited_capabilities;
107 volatile bool _class_file_load_hook_ever_enabled;
108 static volatile bool _needs_clean_up;
109 char** _native_method_prefixes;
110 int _native_method_prefix_count;
111
112 protected:
113 JvmtiEnvBase(jint version);
114 ~JvmtiEnvBase();
115 void dispose();
116 void env_dispose();
117
118 void set_env_local_storage(const void* data) { _env_local_storage = data; }
119 const void* get_env_local_storage() { return _env_local_storage; }
120
121 void record_class_file_load_hook_enabled();
122 void record_first_time_class_file_load_hook_enabled();
123
124 char** get_native_method_prefixes() { return _native_method_prefixes; }
125 int get_native_method_prefix_count() { return _native_method_prefix_count; }
126 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes);
127
128 private:
129 friend class JvmtiEventControllerPrivate;
130 void initialize();
131 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks);
132 static void globally_initialize();
133 static void periodic_clean_up();
134
135 friend class JvmtiEnvIterator;
136 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; }
137 void set_next_environment(JvmtiEnvBase* env) { _next = env; }
138 static JvmtiEnv* head_environment() {
139 JVMTI_ONLY(return (JvmtiEnv*)_head_environment);
140 NOT_JVMTI(return NULL);
141 }
142
143 public:
144
145 jvmtiPhase phase();
146 bool is_valid();
147
148 bool use_version_1_0_semantics(); // agent asked for version 1.0
149 bool use_version_1_1_semantics(); // agent asked for version 1.1
150 bool use_version_1_2_semantics(); // agent asked for version 1.2
151
152 bool is_retransformable() { return _is_retransformable; }
153
154 static ByteSize jvmti_external_offset() {
155 return byte_offset_of(JvmtiEnvBase, _jvmti_external);
156 };
157
158 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) {
159 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset()));
160 };
161
162 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; }
163
164 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; }
165
166 bool early_class_hook_env() {
167 return get_capabilities()->can_generate_early_class_hook_events != 0
168 && get_capabilities()->can_generate_all_class_hook_events != 0;
169 }
170
171 bool early_vmstart_env() {
172 return get_capabilities()->can_generate_early_vmstart != 0;
173 }
174
175 static char** get_all_native_method_prefixes(int* count_ptr);
176
177 // This test will answer true when all environments have been disposed and some have
178 // not yet been deallocated. As a result, this test should only be used as an
179 // optimization for the no environment case.
180 static bool environments_might_exist() {
181 return head_environment() != NULL;
182 }
183
184 static void check_for_periodic_clean_up();
185
186 JvmtiEnvEventEnable *env_event_enable() {
187 return &_env_event_enable;
188 }
189
190 jvmtiError allocate(jlong size, unsigned char** mem_ptr) {
191 if (size < 0) {
192 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
193 }
194 if (size == 0) {
195 *mem_ptr = NULL;
196 } else {
197 *mem_ptr = (unsigned char *)os::malloc((size_t)size, mtInternal);
198 if (*mem_ptr == NULL) {
199 return JVMTI_ERROR_OUT_OF_MEMORY;
200 }
201 }
202 return JVMTI_ERROR_NONE;
203 }
204
205 jvmtiError deallocate(unsigned char* mem) {
206 if (mem != NULL) {
207 os::free(mem);
208 }
209 return JVMTI_ERROR_NONE;
210 }
211
212
213 // Memory functions
214 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate
215
216 // method to create a local handle
217 jobject jni_reference(Handle hndl) {
218 return JNIHandles::make_local(hndl());
219 }
220
221 // method to create a local handle.
222 // This function allows caller to specify which
223 // threads local handle table to use.
224 jobject jni_reference(JavaThread *thread, Handle hndl) {
225 return JNIHandles::make_local(thread, hndl());
226 }
227
228 // method to destroy a local handle
229 void destroy_jni_reference(jobject jobj) {
230 JNIHandles::destroy_local(jobj);
231 }
232
233 // method to destroy a local handle.
234 // This function allows caller to specify which
235 // threads local handle table to use although currently it is
236 // not used.
237 void destroy_jni_reference(JavaThread *thread, jobject jobj) {
238 destroy_jni_reference(jobj);
239 }
240
241 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
242
243 // Event Dispatch
244
245 bool has_callback(jvmtiEvent event_type) {
246 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
247 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
248 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
249 }
250
251 jvmtiEventCallbacks* callbacks() {
252 return &_event_callbacks;
253 }
254
255 jvmtiExtEventCallbacks* ext_callbacks() {
256 return &_ext_event_callbacks;
257 }
258
259 void set_tag_map(JvmtiTagMap* tag_map) {
260 _tag_map = tag_map;
261 }
262
263 JvmtiTagMap* tag_map() {
264 return _tag_map;
265 }
266
267
268 // return true if event is enabled globally or for any thread
269 // True only if there is a callback for it.
270 bool is_enabled(jvmtiEvent event_type) {
271 return _env_event_enable.is_enabled(event_type);
272 }
273
274 // Random Utilities
275
276 protected:
277 // helper methods for creating arrays of global JNI Handles from local Handles
278 // allocated into environment specific storage
279 jobject * new_jobjectArray(int length, Handle *handles);
280 jthread * new_jthreadArray(int length, Handle *handles);
281 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
282
283 // convert from JNIHandle to JavaThread *
284 JavaThread * get_JavaThread(jthread jni_thread);
285
286 // convert to a jni jclass from a non-null Klass*
287 jclass get_jni_class_non_null(Klass* k);
288
289 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
290 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
291 JavaThread* java_thread,
292 javaVFrame *jvf,
293 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
294 jint depth);
295 vframe* vframeFor(JavaThread* java_thread, jint depth);
296
297 public:
298 // get a field descriptor for the specified class and field
299 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd);
300 // test for suspend - most (all?) of these should go away
301 static bool is_thread_fully_suspended(JavaThread *thread,
302 bool wait_for_suspend,
303 uint32_t *bits);
304
305
306 // JVMTI API helper functions which are called at safepoint or thread is suspended.
307 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
308 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
309 jmethodID* method_ptr, jlocation* location_ptr);
310 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
311 jobject object, jvmtiMonitorUsage* info_ptr);
312 jvmtiError get_stack_trace(JavaThread *java_thread,
313 jint stack_depth, jint max_count,
314 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
315 jvmtiError get_current_contended_monitor(JavaThread *calling_thread,
316 JavaThread *java_thread,
317 jobject *monitor_ptr);
318 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
319 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
320 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
321 jvalue value, TosState tos, Handle* ret_ob_h);
322 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
323 };
324
325 // This class is the only safe means of iterating through environments.
326 // Note that this iteratation includes invalid environments pending
327 // deallocation -- in fact, some uses depend on this behavior.
328
329 class JvmtiEnvIterator : public StackObj {
330 private:
331 bool _entry_was_marked;
332 public:
333 JvmtiEnvIterator() {
334 if (Threads::number_of_threads() == 0) {
335 _entry_was_marked = false; // we are single-threaded, no need
336 } else {
337 Thread::current()->entering_jvmti_env_iteration();
338 _entry_was_marked = true;
339 }
340 }
341 ~JvmtiEnvIterator() {
342 if (_entry_was_marked) {
343 Thread::current()->leaving_jvmti_env_iteration();
344 }
345 }
346 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
347 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
348 };
349
350 // VM operation to update for pop top frame.
351 class VM_UpdateForPopTopFrame : public VM_Operation {
352 private:
353 JvmtiThreadState* _state;
354 jvmtiError _result;
355
356 public:
357 VM_UpdateForPopTopFrame(JvmtiThreadState* state) {
358 _state = state;
359 _result = JVMTI_ERROR_NONE;
360 }
361 VMOp_Type type() const { return VMOp_UpdateForPopTopFrame; }
362 jvmtiError result() { return _result; }
363 void doit() {
364 JavaThread* jt = _state->get_thread();
365 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
366 _state->update_for_pop_top_frame();
367 } else {
368 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
369 }
370 }
371 };
372
373 // VM operation to set frame pop.
374 class VM_SetFramePop : public VM_Operation {
375 private:
376 JvmtiEnv *_env;
377 JvmtiThreadState* _state;
378 jint _depth;
379 jvmtiError _result;
380
381 public:
382 VM_SetFramePop(JvmtiEnv *env, JvmtiThreadState* state, jint depth) {
383 _env = env;
384 _state = state;
385 _depth = depth;
386 _result = JVMTI_ERROR_NONE;
387 }
388 // Nested operation must be allowed for the VM_EnterInterpOnlyMode that is
389 // called from the JvmtiEventControllerPrivate::recompute_thread_enabled.
390 bool allow_nested_vm_operations() const { return true; }
391 VMOp_Type type() const { return VMOp_SetFramePop; }
392 jvmtiError result() { return _result; }
393 void doit() {
394 JavaThread* jt = _state->get_thread();
395 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
396 int frame_number = _state->count_frames() - _depth;
397 _state->env_thread_state((JvmtiEnvBase*)_env)->set_frame_pop(frame_number);
398 } else {
399 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
400 }
401 }
402 };
403
404
405 // VM operation to get monitor information with stack depth.
406 class VM_GetOwnedMonitorInfo : public VM_Operation {
407 private:
408 JvmtiEnv *_env;
409 JavaThread* _calling_thread;
410 JavaThread *_java_thread;
411 jvmtiError _result;
412 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
413
414 public:
415 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread,
416 JavaThread* java_thread,
417 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) {
418 _env = env;
419 _calling_thread = calling_thread;
420 _java_thread = java_thread;
421 _owned_monitors_list = owned_monitor_list;
422 _result = JVMTI_ERROR_NONE;
423 }
424 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; }
425 void doit() {
426 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
427 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
428 && _java_thread->threadObj() != NULL) {
429 _result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
430 _owned_monitors_list);
431 }
432 }
433 jvmtiError result() { return _result; }
434 };
435
436
437 // VM operation to get object monitor usage.
438 class VM_GetObjectMonitorUsage : public VM_Operation {
439 private:
440 JvmtiEnv *_env;
441 jobject _object;
442 JavaThread* _calling_thread;
443 jvmtiMonitorUsage* _info_ptr;
444 jvmtiError _result;
445
446 public:
447 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
448 _env = env;
449 _object = object;
450 _calling_thread = calling_thread;
451 _info_ptr = info_ptr;
452 }
453 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
454 jvmtiError result() { return _result; }
455 void doit() {
456 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
457 }
458
459 };
460
461 // VM operation to get current contended monitor.
462 class VM_GetCurrentContendedMonitor : public VM_Operation {
463 private:
464 JvmtiEnv *_env;
465 JavaThread *_calling_thread;
466 JavaThread *_java_thread;
467 jobject *_owned_monitor_ptr;
468 jvmtiError _result;
469
470 public:
471 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) {
472 _env = env;
473 _calling_thread = calling_thread;
474 _java_thread = java_thread;
475 _owned_monitor_ptr = mon_ptr;
476 }
477 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; }
478 jvmtiError result() { return _result; }
479 void doit() {
480 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
481 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
482 _java_thread->threadObj() != NULL) {
483 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
484 }
485 }
486 };
487
488 // VM operation to get stack trace at safepoint.
489 class VM_GetStackTrace : public VM_Operation {
490 private:
491 JvmtiEnv *_env;
492 JavaThread *_java_thread;
493 jint _start_depth;
494 jint _max_count;
495 jvmtiFrameInfo *_frame_buffer;
496 jint *_count_ptr;
497 jvmtiError _result;
498
499 public:
500 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread,
501 jint start_depth, jint max_count,
502 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
503 _env = env;
504 _java_thread = java_thread;
505 _start_depth = start_depth;
506 _max_count = max_count;
507 _frame_buffer = frame_buffer;
508 _count_ptr = count_ptr;
509 }
510 jvmtiError result() { return _result; }
511 VMOp_Type type() const { return VMOp_GetStackTrace; }
512 void doit() {
513 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
514 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
515 && _java_thread->threadObj() != NULL) {
516 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
517 _start_depth, _max_count,
518 _frame_buffer, _count_ptr);
519 }
520 }
521 };
522
523 // forward declaration
524 struct StackInfoNode;
525
526 // VM operation to get stack trace at safepoint.
527 class VM_GetMultipleStackTraces : public VM_Operation {
528 private:
529 JvmtiEnv *_env;
530 jint _max_frame_count;
531 jvmtiStackInfo *_stack_info;
532 jvmtiError _result;
533 int _frame_count_total;
534 struct StackInfoNode *_head;
535
536 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
537 jint max_frame_count() { return _max_frame_count; }
538 struct StackInfoNode *head() { return _head; }
539 void set_head(StackInfoNode *head) { _head = head; }
540
541 protected:
542 void set_result(jvmtiError result) { _result = result; }
543 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
544 void allocate_and_fill_stacks(jint thread_count);
545
546 public:
547 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) {
548 _env = env;
549 _max_frame_count = max_frame_count;
550 _frame_count_total = 0;
551 _head = NULL;
552 _result = JVMTI_ERROR_NONE;
553 }
554 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; }
555 jvmtiStackInfo *stack_info() { return _stack_info; }
556 jvmtiError result() { return _result; }
557 };
558
559
560 // VM operation to get stack trace at safepoint.
561 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces {
562 private:
563 JavaThread *_calling_thread;
564 jint _final_thread_count;
565
566 public:
567 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
568 jint max_frame_count)
569 : VM_GetMultipleStackTraces(env, max_frame_count) {
570 _calling_thread = calling_thread;
571 }
572 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
573 void doit();
574 jint final_thread_count() { return _final_thread_count; }
575 };
576
577 // VM operation to get stack trace at safepoint.
578 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces {
579 private:
580 jint _thread_count;
581 const jthread* _thread_list;
582
583 public:
584 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
585 : VM_GetMultipleStackTraces(env, max_frame_count) {
586 _thread_count = thread_count;
587 _thread_list = thread_list;
588 }
589 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
590 void doit();
591 };
592
593
594 // VM operation to count stack frames at safepoint.
595 class VM_GetFrameCount : public VM_Operation {
596 private:
597 JvmtiEnv *_env;
598 JvmtiThreadState *_state;
599 jint *_count_ptr;
600 jvmtiError _result;
601
602 public:
603 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) {
604 _env = env;
605 _state = state;
606 _count_ptr = count_ptr;
607 }
608 VMOp_Type type() const { return VMOp_GetFrameCount; }
609 jvmtiError result() { return _result; }
610 void doit() {
611 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
612 JavaThread* jt = _state->get_thread();
613 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
614 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
615 }
616 }
617 };
618
619 // VM operation to frame location at safepoint.
620 class VM_GetFrameLocation : public VM_Operation {
621 private:
622 JvmtiEnv *_env;
623 JavaThread* _java_thread;
624 jint _depth;
625 jmethodID* _method_ptr;
626 jlocation* _location_ptr;
627 jvmtiError _result;
628
629 public:
630 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth,
631 jmethodID* method_ptr, jlocation* location_ptr) {
632 _env = env;
633 _java_thread = java_thread;
634 _depth = depth;
635 _method_ptr = method_ptr;
636 _location_ptr = location_ptr;
637 }
638 VMOp_Type type() const { return VMOp_GetFrameLocation; }
639 jvmtiError result() { return _result; }
640 void doit() {
641 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
642 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
643 _java_thread->threadObj() != NULL) {
644 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
645 _method_ptr, _location_ptr);
646 }
647 }
648 };
649
650
651 // ResourceTracker
652 //
653 // ResourceTracker works a little like a ResourceMark. All allocates
654 // using the resource tracker are recorded. If an allocate using the
655 // resource tracker fails the destructor will free any resources
656 // that were allocated using the tracker.
657 // The motive for this class is to avoid messy error recovery code
658 // in situations where multiple allocations are done in sequence. If
659 // the second or subsequent allocation fails it avoids any code to
660 // release memory allocated in the previous calls.
661 //
662 // Usage :-
663 // ResourceTracker rt(env);
664 // :
665 // err = rt.allocate(1024, &ptr);
666
667 class ResourceTracker : public StackObj {
668 private:
669 JvmtiEnv* _env;
670 GrowableArray<unsigned char*> *_allocations;
671 bool _failed;
672 public:
673 ResourceTracker(JvmtiEnv* env);
674 ~ResourceTracker();
675 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
676 unsigned char* allocate(jlong size);
677 char* strdup(const char* str);
678 };
679
680
681 // Jvmti monitor closure to collect off stack monitors.
682 class JvmtiMonitorClosure: public MonitorClosure {
683 private:
684 JavaThread *_java_thread;
685 JavaThread *_calling_thread;
686 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
687 jvmtiError _error;
688 JvmtiEnvBase *_env;
689
690 public:
691 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
692 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
693 JvmtiEnvBase *env) {
694 _java_thread = thread;
695 _calling_thread = calling_thread;
696 _owned_monitors_list = owned_monitors;
697 _error = JVMTI_ERROR_NONE;
698 _env = env;
699 }
700 void do_monitor(ObjectMonitor* mon);
701 jvmtiError error() { return _error;}
702 };
703
704
705 // Jvmti module closure to collect all modules loaded to the system.
706 class JvmtiModuleClosure : public StackObj {
707 private:
708 static GrowableArray<OopHandle> *_tbl; // Protected with Module_lock
709
710 static void do_module(ModuleEntry* entry) {
711 assert_locked_or_safepoint(Module_lock);
712 OopHandle module = entry->module_handle();
713 guarantee(module.resolve() != NULL, "module object is NULL");
714 _tbl->push(module);
715 }
716
717 public:
718 jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr);
719 };
720
721 #endif // SHARE_VM_PRIMS_JVMTIENVBASE_HPP