|
1 /* |
|
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 * have any questions. |
|
22 * |
|
23 */ |
|
24 |
|
25 #ifndef _JAVA_JVMTIENVBASE_H_ |
|
26 #define _JAVA_JVMTIENVBASE_H_ |
|
27 |
|
28 // |
|
29 // Forward Declarations |
|
30 // |
|
31 |
|
32 class JvmtiEnv; |
|
33 class JvmtiThreadState; |
|
34 class JvmtiRawMonitor; // for jvmtiEnv.hpp |
|
35 class JvmtiEventControllerPrivate; |
|
36 class JvmtiTagMap; |
|
37 |
|
38 |
|
39 |
|
40 // One JvmtiEnv object is created per jvmti attachment; |
|
41 // done via JNI GetEnv() call. Multiple attachments are |
|
42 // allowed in jvmti. |
|
43 |
|
44 class JvmtiEnvBase : public CHeapObj { |
|
45 |
|
46 private: |
|
47 |
|
48 static JvmtiEnvBase* _head_environment; // head of environment list |
|
49 |
|
50 static bool _globally_initialized; |
|
51 static jvmtiPhase _phase; |
|
52 static volatile int _dying_thread_env_iteration_count; |
|
53 |
|
54 public: |
|
55 |
|
56 enum { |
|
57 JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */ |
|
58 JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102 /* version: 1.1.102 */ |
|
59 }; |
|
60 |
|
61 static jvmtiPhase get_phase() { return _phase; } |
|
62 static void set_phase(jvmtiPhase phase) { _phase = phase; } |
|
63 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; } |
|
64 |
|
65 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; } |
|
66 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; } |
|
67 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; } |
|
68 |
|
69 private: |
|
70 |
|
71 enum { |
|
72 JVMTI_MAGIC = 0x71EE, |
|
73 DISPOSED_MAGIC = 0xDEFC, |
|
74 BAD_MAGIC = 0xDEAD |
|
75 }; |
|
76 |
|
77 jvmtiEnv _jvmti_external; |
|
78 jint _magic; |
|
79 JvmtiEnvBase* _next; |
|
80 bool _is_retransformable; |
|
81 const void *_env_local_storage; // per env agent allocated data. |
|
82 jvmtiEventCallbacks _event_callbacks; |
|
83 jvmtiExtEventCallbacks _ext_event_callbacks; |
|
84 JvmtiTagMap* _tag_map; |
|
85 JvmtiEnvEventEnable _env_event_enable; |
|
86 jvmtiCapabilities _current_capabilities; |
|
87 jvmtiCapabilities _prohibited_capabilities; |
|
88 volatile bool _class_file_load_hook_ever_enabled; |
|
89 static volatile bool _needs_clean_up; |
|
90 char** _native_method_prefixes; |
|
91 int _native_method_prefix_count; |
|
92 |
|
93 protected: |
|
94 JvmtiEnvBase(); |
|
95 ~JvmtiEnvBase(); |
|
96 void dispose(); |
|
97 void env_dispose(); |
|
98 |
|
99 void set_env_local_storage(const void* data) { _env_local_storage = data; } |
|
100 const void* get_env_local_storage() { return _env_local_storage; } |
|
101 |
|
102 void record_class_file_load_hook_enabled(); |
|
103 void record_first_time_class_file_load_hook_enabled(); |
|
104 |
|
105 char** get_native_method_prefixes() { return _native_method_prefixes; } |
|
106 int get_native_method_prefix_count() { return _native_method_prefix_count; } |
|
107 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes); |
|
108 |
|
109 private: |
|
110 friend class JvmtiEventControllerPrivate; |
|
111 void initialize(); |
|
112 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks); |
|
113 static void globally_initialize(); |
|
114 static void periodic_clean_up(); |
|
115 |
|
116 friend class JvmtiEnvIterator; |
|
117 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; } |
|
118 void set_next_environment(JvmtiEnvBase* env) { _next = env; } |
|
119 static JvmtiEnv* head_environment() { return (JvmtiEnv*)_head_environment; } |
|
120 |
|
121 public: |
|
122 |
|
123 bool is_valid() { return _magic == JVMTI_MAGIC; } |
|
124 |
|
125 bool is_retransformable() { return _is_retransformable; } |
|
126 |
|
127 static ByteSize jvmti_external_offset() { |
|
128 return byte_offset_of(JvmtiEnvBase, _jvmti_external); |
|
129 }; |
|
130 |
|
131 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) { |
|
132 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset())); |
|
133 }; |
|
134 |
|
135 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; } |
|
136 |
|
137 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; } |
|
138 |
|
139 static char** get_all_native_method_prefixes(int* count_ptr); |
|
140 |
|
141 // This test will answer true when all environments have been disposed and some have |
|
142 // not yet been deallocated. As a result, this test should only be used as an |
|
143 // optimization for the no environment case. |
|
144 static bool environments_might_exist() { |
|
145 return head_environment() != NULL; |
|
146 } |
|
147 |
|
148 static void check_for_periodic_clean_up(); |
|
149 |
|
150 JvmtiEnvEventEnable *env_event_enable() { |
|
151 return &_env_event_enable; |
|
152 } |
|
153 |
|
154 jvmtiError allocate(jlong size, unsigned char** mem_ptr) { |
|
155 if (size < 0) { |
|
156 return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
|
157 } |
|
158 if (size == 0) { |
|
159 *mem_ptr = NULL; |
|
160 } else { |
|
161 *mem_ptr = (unsigned char *)os::malloc((size_t)size); |
|
162 if (*mem_ptr == NULL) { |
|
163 return JVMTI_ERROR_OUT_OF_MEMORY; |
|
164 } |
|
165 } |
|
166 return JVMTI_ERROR_NONE; |
|
167 } |
|
168 |
|
169 jvmtiError deallocate(unsigned char* mem) { |
|
170 if (mem != NULL) { |
|
171 os::free(mem); |
|
172 } |
|
173 return JVMTI_ERROR_NONE; |
|
174 } |
|
175 |
|
176 |
|
177 // Memory functions |
|
178 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate |
|
179 |
|
180 // method to create a local handle |
|
181 jobject jni_reference(Handle hndl) { |
|
182 return JNIHandles::make_local(hndl()); |
|
183 } |
|
184 |
|
185 // method to create a local handle. |
|
186 // This function allows caller to specify which |
|
187 // threads local handle table to use. |
|
188 jobject jni_reference(JavaThread *thread, Handle hndl) { |
|
189 return JNIHandles::make_local(thread, hndl()); |
|
190 } |
|
191 |
|
192 // method to destroy a local handle |
|
193 void destroy_jni_reference(jobject jobj) { |
|
194 JNIHandles::destroy_local(jobj); |
|
195 } |
|
196 |
|
197 // method to destroy a local handle. |
|
198 // This function allows caller to specify which |
|
199 // threads local handle table to use although currently it is |
|
200 // not used. |
|
201 void destroy_jni_reference(JavaThread *thread, jobject jobj) { |
|
202 destroy_jni_reference(jobj); |
|
203 } |
|
204 |
|
205 jvmtiEnv* jvmti_external() { return &_jvmti_external; }; |
|
206 |
|
207 // Event Dispatch |
|
208 |
|
209 bool has_callback(jvmtiEvent event_type) { |
|
210 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL && |
|
211 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking"); |
|
212 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL; |
|
213 } |
|
214 |
|
215 jvmtiEventCallbacks* callbacks() { |
|
216 return &_event_callbacks; |
|
217 } |
|
218 |
|
219 jvmtiExtEventCallbacks* ext_callbacks() { |
|
220 return &_ext_event_callbacks; |
|
221 } |
|
222 |
|
223 void set_tag_map(JvmtiTagMap* tag_map) { |
|
224 _tag_map = tag_map; |
|
225 } |
|
226 |
|
227 JvmtiTagMap* tag_map() { |
|
228 return _tag_map; |
|
229 } |
|
230 |
|
231 |
|
232 // return true if event is enabled globally or for any thread |
|
233 // True only if there is a callback for it. |
|
234 bool is_enabled(jvmtiEvent event_type) { |
|
235 return _env_event_enable.is_enabled(event_type); |
|
236 } |
|
237 |
|
238 // Random Utilities |
|
239 |
|
240 protected: |
|
241 // helper methods for creating arrays of global JNI Handles from local Handles |
|
242 // allocated into environment specific storage |
|
243 jobject * new_jobjectArray(int length, Handle *handles); |
|
244 jthread * new_jthreadArray(int length, Handle *handles); |
|
245 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles); |
|
246 |
|
247 // convert from JNIHandle to JavaThread * |
|
248 JavaThread * get_JavaThread(jthread jni_thread); |
|
249 |
|
250 // convert to a jni jclass from a non-null klassOop |
|
251 jclass get_jni_class_non_null(klassOop k); |
|
252 |
|
253 void update_klass_field_access_flag(fieldDescriptor *fd); |
|
254 |
|
255 jint count_locked_objects(JavaThread *java_thread, Handle hobj); |
|
256 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread, |
|
257 JavaThread* java_thread, |
|
258 javaVFrame *jvf, |
|
259 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, |
|
260 jint depth); |
|
261 vframe* vframeFor(JavaThread* java_thread, jint depth); |
|
262 |
|
263 public: |
|
264 // get a field descriptor for the specified class and field |
|
265 static bool get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd); |
|
266 // test for suspend - most (all?) of these should go away |
|
267 static bool is_thread_fully_suspended(JavaThread *thread, |
|
268 bool wait_for_suspend, |
|
269 uint32_t *bits); |
|
270 |
|
271 |
|
272 // JVMTI API helper functions which are called at safepoint or thread is suspended. |
|
273 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr); |
|
274 jvmtiError get_frame_location(JavaThread* java_thread, jint depth, |
|
275 jmethodID* method_ptr, jlocation* location_ptr); |
|
276 jvmtiError get_object_monitor_usage(JavaThread *calling_thread, |
|
277 jobject object, jvmtiMonitorUsage* info_ptr); |
|
278 jvmtiError get_stack_trace(JavaThread *java_thread, |
|
279 jint stack_depth, jint max_count, |
|
280 jvmtiFrameInfo* frame_buffer, jint* count_ptr); |
|
281 jvmtiError get_current_contended_monitor(JavaThread *calling_thread, |
|
282 JavaThread *java_thread, |
|
283 jobject *monitor_ptr); |
|
284 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, |
|
285 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list); |
|
286 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread, |
|
287 jvalue value, TosState tos, Handle* ret_ob_h); |
|
288 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos); |
|
289 }; |
|
290 |
|
291 // This class is the only safe means of iterating through environments. |
|
292 // Note that this iteratation includes invalid environments pending |
|
293 // deallocation -- in fact, some uses depend on this behavior. |
|
294 |
|
295 class JvmtiEnvIterator : public StackObj { |
|
296 private: |
|
297 bool _entry_was_marked; |
|
298 public: |
|
299 JvmtiEnvIterator() { |
|
300 if (Threads::number_of_threads() == 0) { |
|
301 _entry_was_marked = false; // we are single-threaded, no need |
|
302 } else { |
|
303 Thread::current()->entering_jvmti_env_iteration(); |
|
304 _entry_was_marked = true; |
|
305 } |
|
306 } |
|
307 ~JvmtiEnvIterator() { |
|
308 if (_entry_was_marked) { |
|
309 Thread::current()->leaving_jvmti_env_iteration(); |
|
310 } |
|
311 } |
|
312 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); } |
|
313 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); } |
|
314 }; |
|
315 |
|
316 |
|
317 // VM operation to get monitor information with stack depth. |
|
318 class VM_GetOwnedMonitorInfo : public VM_Operation { |
|
319 private: |
|
320 JvmtiEnv *_env; |
|
321 JavaThread* _calling_thread; |
|
322 JavaThread *_java_thread; |
|
323 jvmtiError _result; |
|
324 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; |
|
325 |
|
326 public: |
|
327 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread, |
|
328 JavaThread* java_thread, |
|
329 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) { |
|
330 _env = env; |
|
331 _calling_thread = calling_thread; |
|
332 _java_thread = java_thread; |
|
333 _owned_monitors_list = owned_monitor_list; |
|
334 _result = JVMTI_ERROR_NONE; |
|
335 } |
|
336 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; } |
|
337 void doit() { |
|
338 ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread, |
|
339 _owned_monitors_list); |
|
340 } |
|
341 jvmtiError result() { return _result; } |
|
342 }; |
|
343 |
|
344 |
|
345 // VM operation to get object monitor usage. |
|
346 class VM_GetObjectMonitorUsage : public VM_Operation { |
|
347 private: |
|
348 JvmtiEnv *_env; |
|
349 jobject _object; |
|
350 JavaThread* _calling_thread; |
|
351 jvmtiMonitorUsage* _info_ptr; |
|
352 jvmtiError _result; |
|
353 |
|
354 public: |
|
355 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { |
|
356 _env = env; |
|
357 _object = object; |
|
358 _calling_thread = calling_thread; |
|
359 _info_ptr = info_ptr; |
|
360 } |
|
361 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; } |
|
362 jvmtiError result() { return _result; } |
|
363 void doit() { |
|
364 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr); |
|
365 } |
|
366 |
|
367 }; |
|
368 |
|
369 // VM operation to get current contended monitor. |
|
370 class VM_GetCurrentContendedMonitor : public VM_Operation { |
|
371 private: |
|
372 JvmtiEnv *_env; |
|
373 JavaThread *_calling_thread; |
|
374 JavaThread *_java_thread; |
|
375 jobject *_owned_monitor_ptr; |
|
376 jvmtiError _result; |
|
377 |
|
378 public: |
|
379 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) { |
|
380 _env = env; |
|
381 _calling_thread = calling_thread; |
|
382 _java_thread = java_thread; |
|
383 _owned_monitor_ptr = mon_ptr; |
|
384 } |
|
385 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; } |
|
386 jvmtiError result() { return _result; } |
|
387 void doit() { |
|
388 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr); |
|
389 } |
|
390 }; |
|
391 |
|
392 // VM operation to get stack trace at safepoint. |
|
393 class VM_GetStackTrace : public VM_Operation { |
|
394 private: |
|
395 JvmtiEnv *_env; |
|
396 JavaThread *_java_thread; |
|
397 jint _start_depth; |
|
398 jint _max_count; |
|
399 jvmtiFrameInfo *_frame_buffer; |
|
400 jint *_count_ptr; |
|
401 jvmtiError _result; |
|
402 |
|
403 public: |
|
404 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread, |
|
405 jint start_depth, jint max_count, |
|
406 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { |
|
407 _env = env; |
|
408 _java_thread = java_thread; |
|
409 _start_depth = start_depth; |
|
410 _max_count = max_count; |
|
411 _frame_buffer = frame_buffer; |
|
412 _count_ptr = count_ptr; |
|
413 } |
|
414 jvmtiError result() { return _result; } |
|
415 VMOp_Type type() const { return VMOp_GetStackTrace; } |
|
416 void doit() { |
|
417 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread, |
|
418 _start_depth, _max_count, |
|
419 _frame_buffer, _count_ptr); |
|
420 } |
|
421 }; |
|
422 |
|
423 // forward declaration |
|
424 struct StackInfoNode; |
|
425 |
|
426 // VM operation to get stack trace at safepoint. |
|
427 class VM_GetMultipleStackTraces : public VM_Operation { |
|
428 private: |
|
429 JvmtiEnv *_env; |
|
430 jint _max_frame_count; |
|
431 jvmtiStackInfo *_stack_info; |
|
432 jvmtiError _result; |
|
433 int _frame_count_total; |
|
434 struct StackInfoNode *_head; |
|
435 |
|
436 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; } |
|
437 jint max_frame_count() { return _max_frame_count; } |
|
438 struct StackInfoNode *head() { return _head; } |
|
439 void set_head(StackInfoNode *head) { _head = head; } |
|
440 |
|
441 protected: |
|
442 void set_result(jvmtiError result) { _result = result; } |
|
443 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop); |
|
444 void allocate_and_fill_stacks(jint thread_count); |
|
445 |
|
446 public: |
|
447 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) { |
|
448 _env = env; |
|
449 _max_frame_count = max_frame_count; |
|
450 _frame_count_total = 0; |
|
451 _head = NULL; |
|
452 _result = JVMTI_ERROR_NONE; |
|
453 } |
|
454 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; } |
|
455 jvmtiStackInfo *stack_info() { return _stack_info; } |
|
456 jvmtiError result() { return _result; } |
|
457 }; |
|
458 |
|
459 |
|
460 // VM operation to get stack trace at safepoint. |
|
461 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces { |
|
462 private: |
|
463 JavaThread *_calling_thread; |
|
464 jint _final_thread_count; |
|
465 |
|
466 public: |
|
467 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread, |
|
468 jint max_frame_count) |
|
469 : VM_GetMultipleStackTraces(env, max_frame_count) { |
|
470 _calling_thread = calling_thread; |
|
471 } |
|
472 VMOp_Type type() const { return VMOp_GetAllStackTraces; } |
|
473 void doit(); |
|
474 jint final_thread_count() { return _final_thread_count; } |
|
475 }; |
|
476 |
|
477 // VM operation to get stack trace at safepoint. |
|
478 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces { |
|
479 private: |
|
480 jint _thread_count; |
|
481 const jthread* _thread_list; |
|
482 |
|
483 public: |
|
484 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count) |
|
485 : VM_GetMultipleStackTraces(env, max_frame_count) { |
|
486 _thread_count = thread_count; |
|
487 _thread_list = thread_list; |
|
488 } |
|
489 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; } |
|
490 void doit(); |
|
491 }; |
|
492 |
|
493 |
|
494 // VM operation to count stack frames at safepoint. |
|
495 class VM_GetFrameCount : public VM_Operation { |
|
496 private: |
|
497 JvmtiEnv *_env; |
|
498 JvmtiThreadState *_state; |
|
499 jint *_count_ptr; |
|
500 jvmtiError _result; |
|
501 |
|
502 public: |
|
503 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) { |
|
504 _env = env; |
|
505 _state = state; |
|
506 _count_ptr = count_ptr; |
|
507 } |
|
508 VMOp_Type type() const { return VMOp_GetFrameCount; } |
|
509 jvmtiError result() { return _result; } |
|
510 void doit() { |
|
511 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr); |
|
512 } |
|
513 }; |
|
514 |
|
515 // VM operation to frame location at safepoint. |
|
516 class VM_GetFrameLocation : public VM_Operation { |
|
517 private: |
|
518 JvmtiEnv *_env; |
|
519 JavaThread* _java_thread; |
|
520 jint _depth; |
|
521 jmethodID* _method_ptr; |
|
522 jlocation* _location_ptr; |
|
523 jvmtiError _result; |
|
524 |
|
525 public: |
|
526 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth, |
|
527 jmethodID* method_ptr, jlocation* location_ptr) { |
|
528 _env = env; |
|
529 _java_thread = java_thread; |
|
530 _depth = depth; |
|
531 _method_ptr = method_ptr; |
|
532 _location_ptr = location_ptr; |
|
533 } |
|
534 VMOp_Type type() const { return VMOp_GetFrameLocation; } |
|
535 jvmtiError result() { return _result; } |
|
536 void doit() { |
|
537 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth, |
|
538 _method_ptr, _location_ptr); |
|
539 } |
|
540 }; |
|
541 |
|
542 |
|
543 // ResourceTracker |
|
544 // |
|
545 // ResourceTracker works a little like a ResourceMark. All allocates |
|
546 // using the resource tracker are recorded. If an allocate using the |
|
547 // resource tracker fails the destructor will free any resources |
|
548 // that were allocated using the tracker. |
|
549 // The motive for this class is to avoid messy error recovery code |
|
550 // in situations where multiple allocations are done in sequence. If |
|
551 // the second or subsequent allocation fails it avoids any code to |
|
552 // release memory allocated in the previous calls. |
|
553 // |
|
554 // Usage :- |
|
555 // ResourceTracker rt(env); |
|
556 // : |
|
557 // err = rt.allocate(1024, &ptr); |
|
558 |
|
559 class ResourceTracker : public StackObj { |
|
560 private: |
|
561 JvmtiEnv* _env; |
|
562 GrowableArray<unsigned char*> *_allocations; |
|
563 bool _failed; |
|
564 public: |
|
565 ResourceTracker(JvmtiEnv* env); |
|
566 ~ResourceTracker(); |
|
567 jvmtiError allocate(jlong size, unsigned char** mem_ptr); |
|
568 unsigned char* allocate(jlong size); |
|
569 char* strdup(const char* str); |
|
570 }; |
|
571 |
|
572 |
|
573 // Jvmti monitor closure to collect off stack monitors. |
|
574 class JvmtiMonitorClosure: public MonitorClosure { |
|
575 private: |
|
576 JavaThread *_java_thread; |
|
577 JavaThread *_calling_thread; |
|
578 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; |
|
579 jvmtiError _error; |
|
580 JvmtiEnvBase *_env; |
|
581 |
|
582 public: |
|
583 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread, |
|
584 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors, |
|
585 JvmtiEnvBase *env) { |
|
586 _java_thread = thread; |
|
587 _calling_thread = calling_thread; |
|
588 _owned_monitors_list = owned_monitors; |
|
589 _error = JVMTI_ERROR_NONE; |
|
590 _env = env; |
|
591 } |
|
592 void do_monitor(ObjectMonitor* mon); |
|
593 jvmtiError error() { return _error;} |
|
594 }; |
|
595 |
|
596 #endif /* _JAVA_JVMTIENVBASE_H_ */ |