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 "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 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* _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 return JNIHandles::make_local(hndl());
218 }
219
220 // method to create a local handle.
221 // This function allows caller to specify which
222 // threads local handle table to use.
223 jobject jni_reference(JavaThread *thread, Handle hndl) {
224 return JNIHandles::make_local(thread, hndl());
225 }
226
227 // method to destroy a local handle
228 void destroy_jni_reference(jobject jobj) {
229 JNIHandles::destroy_local(jobj);
230 }
231
232 // method to destroy a local handle.
233 // This function allows caller to specify which
234 // threads local handle table to use although currently it is
235 // not used.
236 void destroy_jni_reference(JavaThread *thread, jobject jobj) {
237 destroy_jni_reference(jobj);
238 }
239
240 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
241
242 // Event Dispatch
243
244 bool has_callback(jvmtiEvent event_type) {
245 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
246 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
247 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
248 }
249
250 jvmtiEventCallbacks* callbacks() {
251 return &_event_callbacks;
252 }
253
254 jvmtiExtEventCallbacks* ext_callbacks() {
255 return &_ext_event_callbacks;
256 }
257
258 void set_tag_map(JvmtiTagMap* tag_map) {
259 _tag_map = tag_map;
260 }
261
262 JvmtiTagMap* tag_map() {
263 return _tag_map;
264 }
265
266
267 // return true if event is enabled globally or for any thread
268 // True only if there is a callback for it.
269 bool is_enabled(jvmtiEvent event_type) {
270 return _env_event_enable.is_enabled(event_type);
271 }
272
273 // Random Utilities
274
275 protected:
276 // helper methods for creating arrays of global JNI Handles from local Handles
277 // allocated into environment specific storage
278 jobject * new_jobjectArray(int length, Handle *handles);
279 jthread * new_jthreadArray(int length, Handle *handles);
280 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
281
282 // convert from JNIHandle to JavaThread *
283 JavaThread * get_JavaThread(jthread jni_thread);
284
285 // convert to a jni jclass from a non-null Klass*
286 jclass get_jni_class_non_null(Klass* k);
287
288 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
289 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
290 JavaThread* java_thread,
291 javaVFrame *jvf,
292 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
293 jint depth);
294 vframe* vframeFor(JavaThread* java_thread, jint depth);
295
296 public:
297 // get a field descriptor for the specified class and field
298 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd);
299 // test for suspend - most (all?) of these should go away
300 static bool is_thread_fully_suspended(JavaThread *thread,
301 bool wait_for_suspend,
302 uint32_t *bits);
303
304
305 // JVMTI API helper functions which are called at safepoint or thread is suspended.
306 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
307 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
308 jmethodID* method_ptr, jlocation* location_ptr);
309 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
310 jobject object, jvmtiMonitorUsage* info_ptr);
311 jvmtiError get_stack_trace(JavaThread *java_thread,
312 jint stack_depth, jint max_count,
313 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
314 jvmtiError get_current_contended_monitor(JavaThread *calling_thread,
315 JavaThread *java_thread,
316 jobject *monitor_ptr);
317 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
318 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
319 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
320 jvalue value, TosState tos, Handle* ret_ob_h);
321 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
322 };
323
324 // This class is the only safe means of iterating through environments.
325 // Note that this iteratation includes invalid environments pending
326 // deallocation -- in fact, some uses depend on this behavior.
327
328 class JvmtiEnvIterator : public StackObj {
329 private:
330 bool _entry_was_marked;
331 public:
332 JvmtiEnvIterator() {
333 if (Threads::number_of_threads() == 0) {
334 _entry_was_marked = false; // we are single-threaded, no need
335 } else {
336 Thread::current()->entering_jvmti_env_iteration();
337 _entry_was_marked = true;
338 }
339 }
340 ~JvmtiEnvIterator() {
341 if (_entry_was_marked) {
342 Thread::current()->leaving_jvmti_env_iteration();
343 }
344 }
345 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
346 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
347 };
348
349 // VM operation to update for pop top frame.
350 class VM_UpdateForPopTopFrame : public VM_Operation {
351 private:
352 JvmtiThreadState* _state;
353 jvmtiError _result;
354
355 public:
356 VM_UpdateForPopTopFrame(JvmtiThreadState* state) {
357 _state = state;
358 _result = JVMTI_ERROR_NONE;
359 }
360 VMOp_Type type() const { return VMOp_UpdateForPopTopFrame; }
361 jvmtiError result() { return _result; }
362 void doit() {
363 JavaThread* jt = _state->get_thread();
364 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
365 _state->update_for_pop_top_frame();
366 } else {
367 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
368 }
369 }
370 };
371
372 // VM operation to set frame pop.
373 class VM_SetFramePop : public VM_Operation {
374 private:
375 JvmtiEnv *_env;
376 JvmtiThreadState* _state;
377 jint _depth;
378 jvmtiError _result;
379
380 public:
381 VM_SetFramePop(JvmtiEnv *env, JvmtiThreadState* state, jint depth) {
382 _env = env;
383 _state = state;
384 _depth = depth;
385 _result = JVMTI_ERROR_NONE;
386 }
387 // Nested operation must be allowed for the VM_EnterInterpOnlyMode that is
388 // called from the JvmtiEventControllerPrivate::recompute_thread_enabled.
389 bool allow_nested_vm_operations() const { return true; }
390 VMOp_Type type() const { return VMOp_SetFramePop; }
391 jvmtiError result() { return _result; }
392 void doit() {
393 JavaThread* jt = _state->get_thread();
394 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
395 int frame_number = _state->count_frames() - _depth;
396 _state->env_thread_state((JvmtiEnvBase*)_env)->set_frame_pop(frame_number);
397 } else {
398 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
399 }
400 }
401 };
402
403
404 // VM operation to get monitor information with stack depth.
405 class VM_GetOwnedMonitorInfo : public VM_Operation {
406 private:
407 JvmtiEnv *_env;
408 JavaThread* _calling_thread;
409 JavaThread *_java_thread;
410 jvmtiError _result;
411 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
412
413 public:
414 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread,
415 JavaThread* java_thread,
416 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) {
417 _env = env;
418 _calling_thread = calling_thread;
419 _java_thread = java_thread;
420 _owned_monitors_list = owned_monitor_list;
421 _result = JVMTI_ERROR_NONE;
422 }
423 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; }
424 void doit() {
425 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
426 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
427 && _java_thread->threadObj() != NULL) {
428 _result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
429 _owned_monitors_list);
430 }
431 }
432 jvmtiError result() { return _result; }
433 };
434
435
436 // VM operation to get object monitor usage.
437 class VM_GetObjectMonitorUsage : public VM_Operation {
438 private:
439 JvmtiEnv *_env;
440 jobject _object;
441 JavaThread* _calling_thread;
442 jvmtiMonitorUsage* _info_ptr;
443 jvmtiError _result;
444
445 public:
446 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
447 _env = env;
448 _object = object;
449 _calling_thread = calling_thread;
450 _info_ptr = info_ptr;
451 }
452 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
453 jvmtiError result() { return _result; }
454 void doit() {
455 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
456 }
457
458 };
459
460 // VM operation to get current contended monitor.
461 class VM_GetCurrentContendedMonitor : public VM_Operation {
462 private:
463 JvmtiEnv *_env;
464 JavaThread *_calling_thread;
465 JavaThread *_java_thread;
466 jobject *_owned_monitor_ptr;
467 jvmtiError _result;
468
469 public:
470 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) {
471 _env = env;
472 _calling_thread = calling_thread;
473 _java_thread = java_thread;
474 _owned_monitor_ptr = mon_ptr;
475 }
476 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; }
477 jvmtiError result() { return _result; }
478 void doit() {
479 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
480 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
481 _java_thread->threadObj() != NULL) {
482 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
483 }
484 }
485 };
486
487 // VM operation to get stack trace at safepoint.
488 class VM_GetStackTrace : public VM_Operation {
489 private:
490 JvmtiEnv *_env;
491 JavaThread *_java_thread;
492 jint _start_depth;
493 jint _max_count;
494 jvmtiFrameInfo *_frame_buffer;
495 jint *_count_ptr;
496 jvmtiError _result;
497
498 public:
499 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread,
500 jint start_depth, jint max_count,
501 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
502 _env = env;
503 _java_thread = java_thread;
504 _start_depth = start_depth;
505 _max_count = max_count;
506 _frame_buffer = frame_buffer;
507 _count_ptr = count_ptr;
508 }
509 jvmtiError result() { return _result; }
510 VMOp_Type type() const { return VMOp_GetStackTrace; }
511 void doit() {
512 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
513 if (Threads::includes(_java_thread) && !_java_thread->is_exiting()
514 && _java_thread->threadObj() != NULL) {
515 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
516 _start_depth, _max_count,
517 _frame_buffer, _count_ptr);
518 }
519 }
520 };
521
522 // forward declaration
523 struct StackInfoNode;
524
525 // VM operation to get stack trace at safepoint.
526 class VM_GetMultipleStackTraces : public VM_Operation {
527 private:
528 JvmtiEnv *_env;
529 jint _max_frame_count;
530 jvmtiStackInfo *_stack_info;
531 jvmtiError _result;
532 int _frame_count_total;
533 struct StackInfoNode *_head;
534
535 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
536 jint max_frame_count() { return _max_frame_count; }
537 struct StackInfoNode *head() { return _head; }
538 void set_head(StackInfoNode *head) { _head = head; }
539
540 protected:
541 void set_result(jvmtiError result) { _result = result; }
542 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
543 void allocate_and_fill_stacks(jint thread_count);
544
545 public:
546 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) {
547 _env = env;
548 _max_frame_count = max_frame_count;
549 _frame_count_total = 0;
550 _head = NULL;
551 _result = JVMTI_ERROR_NONE;
552 }
553 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; }
554 jvmtiStackInfo *stack_info() { return _stack_info; }
555 jvmtiError result() { return _result; }
556 };
557
558
559 // VM operation to get stack trace at safepoint.
560 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces {
561 private:
562 JavaThread *_calling_thread;
563 jint _final_thread_count;
564
565 public:
566 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
567 jint max_frame_count)
568 : VM_GetMultipleStackTraces(env, max_frame_count) {
569 _calling_thread = calling_thread;
570 }
571 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
572 void doit();
573 jint final_thread_count() { return _final_thread_count; }
574 };
575
576 // VM operation to get stack trace at safepoint.
577 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces {
578 private:
579 jint _thread_count;
580 const jthread* _thread_list;
581
582 public:
583 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
584 : VM_GetMultipleStackTraces(env, max_frame_count) {
585 _thread_count = thread_count;
586 _thread_list = thread_list;
587 }
588 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
589 void doit();
590 };
591
592
593 // VM operation to count stack frames at safepoint.
594 class VM_GetFrameCount : public VM_Operation {
595 private:
596 JvmtiEnv *_env;
597 JvmtiThreadState *_state;
598 jint *_count_ptr;
599 jvmtiError _result;
600
601 public:
602 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) {
603 _env = env;
604 _state = state;
605 _count_ptr = count_ptr;
606 }
607 VMOp_Type type() const { return VMOp_GetFrameCount; }
608 jvmtiError result() { return _result; }
609 void doit() {
610 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
611 JavaThread* jt = _state->get_thread();
612 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
613 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
614 }
615 }
616 };
617
618 // VM operation to frame location at safepoint.
619 class VM_GetFrameLocation : public VM_Operation {
620 private:
621 JvmtiEnv *_env;
622 JavaThread* _java_thread;
623 jint _depth;
624 jmethodID* _method_ptr;
625 jlocation* _location_ptr;
626 jvmtiError _result;
627
628 public:
629 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth,
630 jmethodID* method_ptr, jlocation* location_ptr) {
631 _env = env;
632 _java_thread = java_thread;
633 _depth = depth;
634 _method_ptr = method_ptr;
635 _location_ptr = location_ptr;
636 }
637 VMOp_Type type() const { return VMOp_GetFrameLocation; }
638 jvmtiError result() { return _result; }
639 void doit() {
640 _result = JVMTI_ERROR_THREAD_NOT_ALIVE;
641 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() &&
642 _java_thread->threadObj() != NULL) {
643 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
644 _method_ptr, _location_ptr);
645 }
646 }
647 };
648
649
650 // ResourceTracker
651 //
652 // ResourceTracker works a little like a ResourceMark. All allocates
653 // using the resource tracker are recorded. If an allocate using the
654 // resource tracker fails the destructor will free any resources
655 // that were allocated using the tracker.
656 // The motive for this class is to avoid messy error recovery code
657 // in situations where multiple allocations are done in sequence. If
658 // the second or subsequent allocation fails it avoids any code to
659 // release memory allocated in the previous calls.
660 //
661 // Usage :-
662 // ResourceTracker rt(env);
663 // :
664 // err = rt.allocate(1024, &ptr);
665
666 class ResourceTracker : public StackObj {
667 private:
668 JvmtiEnv* _env;
669 GrowableArray<unsigned char*> *_allocations;
670 bool _failed;
671 public:
672 ResourceTracker(JvmtiEnv* env);
673 ~ResourceTracker();
674 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
675 unsigned char* allocate(jlong size);
676 char* strdup(const char* str);
677 };
678
679
680 // Jvmti monitor closure to collect off stack monitors.
681 class JvmtiMonitorClosure: public MonitorClosure {
682 private:
683 JavaThread *_java_thread;
684 JavaThread *_calling_thread;
685 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
686 jvmtiError _error;
687 JvmtiEnvBase *_env;
688
689 public:
690 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
691 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
692 JvmtiEnvBase *env) {
693 _java_thread = thread;
694 _calling_thread = calling_thread;
695 _owned_monitors_list = owned_monitors;
696 _error = JVMTI_ERROR_NONE;
697 _env = env;
698 }
699 void do_monitor(ObjectMonitor* mon);
700 jvmtiError error() { return _error;}
701 };
702
703
704 // Jvmti module closure to collect all modules loaded to the system.
705 class JvmtiModuleClosure : public StackObj {
706 private:
707 static GrowableArray<jobject> *_tbl; // Protected with Module_lock
708
709 static void do_module(ModuleEntry* entry) {
710 assert_locked_or_safepoint(Module_lock);
711 jobject module = entry->module_handle();
712 guarantee(module != NULL, "module object is NULL");
713 _tbl->push(module);
714 }
715
716 public:
717 jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr);
718 };
719
720 #endif // SHARE_VM_PRIMS_JVMTIENVBASE_HPP