Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiEnvBase.hpp @ 1407:09e7826ecf01
Can now call to Java code from the VM.
Need to specify a JAR file with the classes from the Maxine subprojects C1X, CRI, and HotSpotVM in the bootclasspath.
See HotSpotVM/README.txt in the Maxine sources for details.
author | Thomas Wuerthinger <thomas.wuerthinger@gmail.com> |
---|---|
date | Tue, 11 May 2010 19:24:14 +0200 |
parents | dcb15a6f342d |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
1121 | 2 * Copyright 2003-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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; | |
1121 | 79 jint _version; // version value passed to JNI GetEnv() |
0 | 80 JvmtiEnvBase* _next; |
81 bool _is_retransformable; | |
82 const void *_env_local_storage; // per env agent allocated data. | |
83 jvmtiEventCallbacks _event_callbacks; | |
84 jvmtiExtEventCallbacks _ext_event_callbacks; | |
85 JvmtiTagMap* _tag_map; | |
86 JvmtiEnvEventEnable _env_event_enable; | |
87 jvmtiCapabilities _current_capabilities; | |
88 jvmtiCapabilities _prohibited_capabilities; | |
89 volatile bool _class_file_load_hook_ever_enabled; | |
90 static volatile bool _needs_clean_up; | |
91 char** _native_method_prefixes; | |
92 int _native_method_prefix_count; | |
93 | |
94 protected: | |
1121 | 95 JvmtiEnvBase(jint version); |
0 | 96 ~JvmtiEnvBase(); |
97 void dispose(); | |
98 void env_dispose(); | |
99 | |
100 void set_env_local_storage(const void* data) { _env_local_storage = data; } | |
101 const void* get_env_local_storage() { return _env_local_storage; } | |
102 | |
103 void record_class_file_load_hook_enabled(); | |
104 void record_first_time_class_file_load_hook_enabled(); | |
105 | |
106 char** get_native_method_prefixes() { return _native_method_prefixes; } | |
107 int get_native_method_prefix_count() { return _native_method_prefix_count; } | |
108 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes); | |
109 | |
110 private: | |
111 friend class JvmtiEventControllerPrivate; | |
112 void initialize(); | |
113 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks); | |
114 static void globally_initialize(); | |
115 static void periodic_clean_up(); | |
116 | |
117 friend class JvmtiEnvIterator; | |
118 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; } | |
119 void set_next_environment(JvmtiEnvBase* env) { _next = env; } | |
120 static JvmtiEnv* head_environment() { return (JvmtiEnv*)_head_environment; } | |
121 | |
122 public: | |
123 | |
611
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6567360: 3/4 SIGBUS in jvmti RawMonitor magic check for unaligned bad monitor pointer
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124 bool is_valid(); |
0 | 125 |
1121 | 126 bool use_version_1_0_semantics(); // agent asked for version 1.0 |
127 bool use_version_1_1_semantics(); // agent asked for version 1.1 | |
128 | |
0 | 129 bool is_retransformable() { return _is_retransformable; } |
130 | |
131 static ByteSize jvmti_external_offset() { | |
132 return byte_offset_of(JvmtiEnvBase, _jvmti_external); | |
133 }; | |
134 | |
135 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) { | |
136 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset())); | |
137 }; | |
138 | |
139 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; } | |
140 | |
141 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; } | |
142 | |
143 static char** get_all_native_method_prefixes(int* count_ptr); | |
144 | |
145 // This test will answer true when all environments have been disposed and some have | |
146 // not yet been deallocated. As a result, this test should only be used as an | |
147 // optimization for the no environment case. | |
148 static bool environments_might_exist() { | |
149 return head_environment() != NULL; | |
150 } | |
151 | |
152 static void check_for_periodic_clean_up(); | |
153 | |
154 JvmtiEnvEventEnable *env_event_enable() { | |
155 return &_env_event_enable; | |
156 } | |
157 | |
158 jvmtiError allocate(jlong size, unsigned char** mem_ptr) { | |
159 if (size < 0) { | |
160 return JVMTI_ERROR_ILLEGAL_ARGUMENT; | |
161 } | |
162 if (size == 0) { | |
163 *mem_ptr = NULL; | |
164 } else { | |
165 *mem_ptr = (unsigned char *)os::malloc((size_t)size); | |
166 if (*mem_ptr == NULL) { | |
167 return JVMTI_ERROR_OUT_OF_MEMORY; | |
168 } | |
169 } | |
170 return JVMTI_ERROR_NONE; | |
171 } | |
172 | |
173 jvmtiError deallocate(unsigned char* mem) { | |
174 if (mem != NULL) { | |
175 os::free(mem); | |
176 } | |
177 return JVMTI_ERROR_NONE; | |
178 } | |
179 | |
180 | |
181 // Memory functions | |
182 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate | |
183 | |
184 // method to create a local handle | |
185 jobject jni_reference(Handle hndl) { | |
186 return JNIHandles::make_local(hndl()); | |
187 } | |
188 | |
189 // method to create a local handle. | |
190 // This function allows caller to specify which | |
191 // threads local handle table to use. | |
192 jobject jni_reference(JavaThread *thread, Handle hndl) { | |
193 return JNIHandles::make_local(thread, hndl()); | |
194 } | |
195 | |
196 // method to destroy a local handle | |
197 void destroy_jni_reference(jobject jobj) { | |
198 JNIHandles::destroy_local(jobj); | |
199 } | |
200 | |
201 // method to destroy a local handle. | |
202 // This function allows caller to specify which | |
203 // threads local handle table to use although currently it is | |
204 // not used. | |
205 void destroy_jni_reference(JavaThread *thread, jobject jobj) { | |
206 destroy_jni_reference(jobj); | |
207 } | |
208 | |
209 jvmtiEnv* jvmti_external() { return &_jvmti_external; }; | |
210 | |
211 // Event Dispatch | |
212 | |
213 bool has_callback(jvmtiEvent event_type) { | |
214 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL && | |
215 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking"); | |
216 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL; | |
217 } | |
218 | |
219 jvmtiEventCallbacks* callbacks() { | |
220 return &_event_callbacks; | |
221 } | |
222 | |
223 jvmtiExtEventCallbacks* ext_callbacks() { | |
224 return &_ext_event_callbacks; | |
225 } | |
226 | |
227 void set_tag_map(JvmtiTagMap* tag_map) { | |
228 _tag_map = tag_map; | |
229 } | |
230 | |
231 JvmtiTagMap* tag_map() { | |
232 return _tag_map; | |
233 } | |
234 | |
235 | |
236 // return true if event is enabled globally or for any thread | |
237 // True only if there is a callback for it. | |
238 bool is_enabled(jvmtiEvent event_type) { | |
239 return _env_event_enable.is_enabled(event_type); | |
240 } | |
241 | |
242 // Random Utilities | |
243 | |
244 protected: | |
245 // helper methods for creating arrays of global JNI Handles from local Handles | |
246 // allocated into environment specific storage | |
247 jobject * new_jobjectArray(int length, Handle *handles); | |
248 jthread * new_jthreadArray(int length, Handle *handles); | |
249 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles); | |
250 | |
251 // convert from JNIHandle to JavaThread * | |
252 JavaThread * get_JavaThread(jthread jni_thread); | |
253 | |
254 // convert to a jni jclass from a non-null klassOop | |
255 jclass get_jni_class_non_null(klassOop k); | |
256 | |
257 void update_klass_field_access_flag(fieldDescriptor *fd); | |
258 | |
259 jint count_locked_objects(JavaThread *java_thread, Handle hobj); | |
260 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread, | |
261 JavaThread* java_thread, | |
262 javaVFrame *jvf, | |
263 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, | |
264 jint depth); | |
265 vframe* vframeFor(JavaThread* java_thread, jint depth); | |
266 | |
267 public: | |
268 // get a field descriptor for the specified class and field | |
269 static bool get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd); | |
270 // test for suspend - most (all?) of these should go away | |
271 static bool is_thread_fully_suspended(JavaThread *thread, | |
272 bool wait_for_suspend, | |
273 uint32_t *bits); | |
274 | |
275 | |
276 // JVMTI API helper functions which are called at safepoint or thread is suspended. | |
277 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr); | |
278 jvmtiError get_frame_location(JavaThread* java_thread, jint depth, | |
279 jmethodID* method_ptr, jlocation* location_ptr); | |
280 jvmtiError get_object_monitor_usage(JavaThread *calling_thread, | |
281 jobject object, jvmtiMonitorUsage* info_ptr); | |
282 jvmtiError get_stack_trace(JavaThread *java_thread, | |
283 jint stack_depth, jint max_count, | |
284 jvmtiFrameInfo* frame_buffer, jint* count_ptr); | |
285 jvmtiError get_current_contended_monitor(JavaThread *calling_thread, | |
286 JavaThread *java_thread, | |
287 jobject *monitor_ptr); | |
288 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, | |
289 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list); | |
290 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread, | |
291 jvalue value, TosState tos, Handle* ret_ob_h); | |
292 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos); | |
293 }; | |
294 | |
295 // This class is the only safe means of iterating through environments. | |
296 // Note that this iteratation includes invalid environments pending | |
297 // deallocation -- in fact, some uses depend on this behavior. | |
298 | |
299 class JvmtiEnvIterator : public StackObj { | |
300 private: | |
301 bool _entry_was_marked; | |
302 public: | |
303 JvmtiEnvIterator() { | |
304 if (Threads::number_of_threads() == 0) { | |
305 _entry_was_marked = false; // we are single-threaded, no need | |
306 } else { | |
307 Thread::current()->entering_jvmti_env_iteration(); | |
308 _entry_was_marked = true; | |
309 } | |
310 } | |
311 ~JvmtiEnvIterator() { | |
312 if (_entry_was_marked) { | |
313 Thread::current()->leaving_jvmti_env_iteration(); | |
314 } | |
315 } | |
316 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); } | |
317 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); } | |
318 }; | |
319 | |
320 | |
321 // VM operation to get monitor information with stack depth. | |
322 class VM_GetOwnedMonitorInfo : public VM_Operation { | |
323 private: | |
324 JvmtiEnv *_env; | |
325 JavaThread* _calling_thread; | |
326 JavaThread *_java_thread; | |
327 jvmtiError _result; | |
328 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; | |
329 | |
330 public: | |
331 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread, | |
332 JavaThread* java_thread, | |
333 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) { | |
334 _env = env; | |
335 _calling_thread = calling_thread; | |
336 _java_thread = java_thread; | |
337 _owned_monitors_list = owned_monitor_list; | |
338 _result = JVMTI_ERROR_NONE; | |
339 } | |
340 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; } | |
341 void doit() { | |
342 ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread, | |
343 _owned_monitors_list); | |
344 } | |
345 jvmtiError result() { return _result; } | |
346 }; | |
347 | |
348 | |
349 // VM operation to get object monitor usage. | |
350 class VM_GetObjectMonitorUsage : public VM_Operation { | |
351 private: | |
352 JvmtiEnv *_env; | |
353 jobject _object; | |
354 JavaThread* _calling_thread; | |
355 jvmtiMonitorUsage* _info_ptr; | |
356 jvmtiError _result; | |
357 | |
358 public: | |
359 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { | |
360 _env = env; | |
361 _object = object; | |
362 _calling_thread = calling_thread; | |
363 _info_ptr = info_ptr; | |
364 } | |
365 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; } | |
366 jvmtiError result() { return _result; } | |
367 void doit() { | |
368 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr); | |
369 } | |
370 | |
371 }; | |
372 | |
373 // VM operation to get current contended monitor. | |
374 class VM_GetCurrentContendedMonitor : public VM_Operation { | |
375 private: | |
376 JvmtiEnv *_env; | |
377 JavaThread *_calling_thread; | |
378 JavaThread *_java_thread; | |
379 jobject *_owned_monitor_ptr; | |
380 jvmtiError _result; | |
381 | |
382 public: | |
383 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) { | |
384 _env = env; | |
385 _calling_thread = calling_thread; | |
386 _java_thread = java_thread; | |
387 _owned_monitor_ptr = mon_ptr; | |
388 } | |
389 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; } | |
390 jvmtiError result() { return _result; } | |
391 void doit() { | |
392 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr); | |
393 } | |
394 }; | |
395 | |
396 // VM operation to get stack trace at safepoint. | |
397 class VM_GetStackTrace : public VM_Operation { | |
398 private: | |
399 JvmtiEnv *_env; | |
400 JavaThread *_java_thread; | |
401 jint _start_depth; | |
402 jint _max_count; | |
403 jvmtiFrameInfo *_frame_buffer; | |
404 jint *_count_ptr; | |
405 jvmtiError _result; | |
406 | |
407 public: | |
408 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread, | |
409 jint start_depth, jint max_count, | |
410 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { | |
411 _env = env; | |
412 _java_thread = java_thread; | |
413 _start_depth = start_depth; | |
414 _max_count = max_count; | |
415 _frame_buffer = frame_buffer; | |
416 _count_ptr = count_ptr; | |
417 } | |
418 jvmtiError result() { return _result; } | |
419 VMOp_Type type() const { return VMOp_GetStackTrace; } | |
420 void doit() { | |
421 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread, | |
422 _start_depth, _max_count, | |
423 _frame_buffer, _count_ptr); | |
424 } | |
425 }; | |
426 | |
427 // forward declaration | |
428 struct StackInfoNode; | |
429 | |
430 // VM operation to get stack trace at safepoint. | |
431 class VM_GetMultipleStackTraces : public VM_Operation { | |
432 private: | |
433 JvmtiEnv *_env; | |
434 jint _max_frame_count; | |
435 jvmtiStackInfo *_stack_info; | |
436 jvmtiError _result; | |
437 int _frame_count_total; | |
438 struct StackInfoNode *_head; | |
439 | |
440 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; } | |
441 jint max_frame_count() { return _max_frame_count; } | |
442 struct StackInfoNode *head() { return _head; } | |
443 void set_head(StackInfoNode *head) { _head = head; } | |
444 | |
445 protected: | |
446 void set_result(jvmtiError result) { _result = result; } | |
447 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop); | |
448 void allocate_and_fill_stacks(jint thread_count); | |
449 | |
450 public: | |
451 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) { | |
452 _env = env; | |
453 _max_frame_count = max_frame_count; | |
454 _frame_count_total = 0; | |
455 _head = NULL; | |
456 _result = JVMTI_ERROR_NONE; | |
457 } | |
458 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; } | |
459 jvmtiStackInfo *stack_info() { return _stack_info; } | |
460 jvmtiError result() { return _result; } | |
461 }; | |
462 | |
463 | |
464 // VM operation to get stack trace at safepoint. | |
465 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces { | |
466 private: | |
467 JavaThread *_calling_thread; | |
468 jint _final_thread_count; | |
469 | |
470 public: | |
471 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread, | |
472 jint max_frame_count) | |
473 : VM_GetMultipleStackTraces(env, max_frame_count) { | |
474 _calling_thread = calling_thread; | |
475 } | |
476 VMOp_Type type() const { return VMOp_GetAllStackTraces; } | |
477 void doit(); | |
478 jint final_thread_count() { return _final_thread_count; } | |
479 }; | |
480 | |
481 // VM operation to get stack trace at safepoint. | |
482 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces { | |
483 private: | |
484 jint _thread_count; | |
485 const jthread* _thread_list; | |
486 | |
487 public: | |
488 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count) | |
489 : VM_GetMultipleStackTraces(env, max_frame_count) { | |
490 _thread_count = thread_count; | |
491 _thread_list = thread_list; | |
492 } | |
493 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; } | |
494 void doit(); | |
495 }; | |
496 | |
497 | |
498 // VM operation to count stack frames at safepoint. | |
499 class VM_GetFrameCount : public VM_Operation { | |
500 private: | |
501 JvmtiEnv *_env; | |
502 JvmtiThreadState *_state; | |
503 jint *_count_ptr; | |
504 jvmtiError _result; | |
505 | |
506 public: | |
507 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) { | |
508 _env = env; | |
509 _state = state; | |
510 _count_ptr = count_ptr; | |
511 } | |
512 VMOp_Type type() const { return VMOp_GetFrameCount; } | |
513 jvmtiError result() { return _result; } | |
514 void doit() { | |
515 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr); | |
516 } | |
517 }; | |
518 | |
519 // VM operation to frame location at safepoint. | |
520 class VM_GetFrameLocation : public VM_Operation { | |
521 private: | |
522 JvmtiEnv *_env; | |
523 JavaThread* _java_thread; | |
524 jint _depth; | |
525 jmethodID* _method_ptr; | |
526 jlocation* _location_ptr; | |
527 jvmtiError _result; | |
528 | |
529 public: | |
530 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth, | |
531 jmethodID* method_ptr, jlocation* location_ptr) { | |
532 _env = env; | |
533 _java_thread = java_thread; | |
534 _depth = depth; | |
535 _method_ptr = method_ptr; | |
536 _location_ptr = location_ptr; | |
537 } | |
538 VMOp_Type type() const { return VMOp_GetFrameLocation; } | |
539 jvmtiError result() { return _result; } | |
540 void doit() { | |
541 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth, | |
542 _method_ptr, _location_ptr); | |
543 } | |
544 }; | |
545 | |
546 | |
547 // ResourceTracker | |
548 // | |
549 // ResourceTracker works a little like a ResourceMark. All allocates | |
550 // using the resource tracker are recorded. If an allocate using the | |
551 // resource tracker fails the destructor will free any resources | |
552 // that were allocated using the tracker. | |
553 // The motive for this class is to avoid messy error recovery code | |
554 // in situations where multiple allocations are done in sequence. If | |
555 // the second or subsequent allocation fails it avoids any code to | |
556 // release memory allocated in the previous calls. | |
557 // | |
558 // Usage :- | |
559 // ResourceTracker rt(env); | |
560 // : | |
561 // err = rt.allocate(1024, &ptr); | |
562 | |
563 class ResourceTracker : public StackObj { | |
564 private: | |
565 JvmtiEnv* _env; | |
566 GrowableArray<unsigned char*> *_allocations; | |
567 bool _failed; | |
568 public: | |
569 ResourceTracker(JvmtiEnv* env); | |
570 ~ResourceTracker(); | |
571 jvmtiError allocate(jlong size, unsigned char** mem_ptr); | |
572 unsigned char* allocate(jlong size); | |
573 char* strdup(const char* str); | |
574 }; | |
575 | |
576 | |
577 // Jvmti monitor closure to collect off stack monitors. | |
578 class JvmtiMonitorClosure: public MonitorClosure { | |
579 private: | |
580 JavaThread *_java_thread; | |
581 JavaThread *_calling_thread; | |
582 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; | |
583 jvmtiError _error; | |
584 JvmtiEnvBase *_env; | |
585 | |
586 public: | |
587 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread, | |
588 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors, | |
589 JvmtiEnvBase *env) { | |
590 _java_thread = thread; | |
591 _calling_thread = calling_thread; | |
592 _owned_monitors_list = owned_monitors; | |
593 _error = JVMTI_ERROR_NONE; | |
594 _env = env; | |
595 } | |
596 void do_monitor(ObjectMonitor* mon); | |
597 jvmtiError error() { return _error;} | |
598 }; | |
599 | |
600 #endif /* _JAVA_JVMTIENVBASE_H_ */ |