Mercurial > hg > truffle
comparison src/share/vm/prims/jvmtiExport.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 98cd9901c161 |
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1 /* | |
2 * Copyright 1998-2006 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_JVMTIEXPORT_H_ | |
26 #define _JAVA_JVMTIEXPORT_H_ | |
27 | |
28 // Forward declarations | |
29 | |
30 class JvmtiEventControllerPrivate; | |
31 class JvmtiManageCapabilities; | |
32 class JvmtiEnv; | |
33 class JvmtiThreadState; | |
34 class AttachOperation; | |
35 | |
36 #ifndef JVMTI_KERNEL | |
37 #define JVMTI_SUPPORT_FLAG(key) \ | |
38 private: \ | |
39 static bool _##key; \ | |
40 public: \ | |
41 inline static void set_##key(bool on) { _##key = (on != 0); } \ | |
42 inline static bool key() { return _##key; } | |
43 #else // JVMTI_KERNEL | |
44 #define JVMTI_SUPPORT_FLAG(key) \ | |
45 private: \ | |
46 const static bool _##key = false; \ | |
47 public: \ | |
48 inline static void set_##key(bool on) { report_unsupported(on); } \ | |
49 inline static bool key() { return _##key; } | |
50 #endif // JVMTI_KERNEL | |
51 | |
52 | |
53 // This class contains the JVMTI interface for the rest of hotspot. | |
54 // | |
55 class JvmtiExport : public AllStatic { | |
56 private: | |
57 static int _field_access_count; | |
58 static int _field_modification_count; | |
59 | |
60 static bool _can_access_local_variables; | |
61 static bool _can_examine_or_deopt_anywhere; | |
62 static bool _can_hotswap_or_post_breakpoint; | |
63 static bool _can_modify_any_class; | |
64 static bool _can_walk_any_space; | |
65 | |
66 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension) | |
67 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order) | |
68 JVMTI_SUPPORT_FLAG(can_post_interpreter_events) | |
69 JVMTI_SUPPORT_FLAG(can_post_exceptions) | |
70 JVMTI_SUPPORT_FLAG(can_post_breakpoint) | |
71 JVMTI_SUPPORT_FLAG(can_post_field_access) | |
72 JVMTI_SUPPORT_FLAG(can_post_field_modification) | |
73 JVMTI_SUPPORT_FLAG(can_post_method_entry) | |
74 JVMTI_SUPPORT_FLAG(can_post_method_exit) | |
75 JVMTI_SUPPORT_FLAG(can_pop_frame) | |
76 JVMTI_SUPPORT_FLAG(can_force_early_return) | |
77 | |
78 friend class JvmtiEventControllerPrivate; // should only modify these flags | |
79 JVMTI_SUPPORT_FLAG(should_post_single_step) | |
80 JVMTI_SUPPORT_FLAG(should_post_field_access) | |
81 JVMTI_SUPPORT_FLAG(should_post_field_modification) | |
82 JVMTI_SUPPORT_FLAG(should_post_class_load) | |
83 JVMTI_SUPPORT_FLAG(should_post_class_prepare) | |
84 JVMTI_SUPPORT_FLAG(should_post_class_unload) | |
85 JVMTI_SUPPORT_FLAG(should_post_native_method_bind) | |
86 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load) | |
87 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload) | |
88 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated) | |
89 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter) | |
90 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered) | |
91 JVMTI_SUPPORT_FLAG(should_post_monitor_wait) | |
92 JVMTI_SUPPORT_FLAG(should_post_monitor_waited) | |
93 JVMTI_SUPPORT_FLAG(should_post_data_dump) | |
94 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start) | |
95 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish) | |
96 | |
97 // ------ the below maybe don't have to be (but are for now) | |
98 // fixed conditions here ------------ | |
99 // any events can be enabled | |
100 JVMTI_SUPPORT_FLAG(should_post_thread_life) | |
101 JVMTI_SUPPORT_FLAG(should_post_object_free) | |
102 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) | |
103 | |
104 // we are holding objects on the heap - need to talk to GC - e.g. | |
105 // breakpoint info | |
106 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) | |
107 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) | |
108 | |
109 // If flag cannot be implemented, give an error if on=true | |
110 static void report_unsupported(bool on); | |
111 | |
112 // these should only be called by the friend class | |
113 friend class JvmtiManageCapabilities; | |
114 inline static void set_can_examine_or_deopt_anywhere(bool on) { _can_examine_or_deopt_anywhere = (on != 0); } | |
115 inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); } | |
116 inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); } | |
117 inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); } | |
118 inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); } | |
119 | |
120 enum { | |
121 JVMTI_VERSION_MASK = 0x70000000, | |
122 JVMTI_VERSION_VALUE = 0x30000000, | |
123 JVMDI_VERSION_VALUE = 0x20000000 | |
124 }; | |
125 | |
126 static void post_field_modification(JavaThread *thread, methodOop method, address location, | |
127 KlassHandle field_klass, Handle object, jfieldID field, | |
128 char sig_type, jvalue *value); | |
129 | |
130 | |
131 private: | |
132 // CompiledMethodUnload events are reported from the VM thread so they | |
133 // are collected in lists (of jmethodID/addresses) and the events are posted later | |
134 // from threads posting CompieldMethodLoad or DynamicCodeGenerated events. | |
135 static bool _have_pending_compiled_method_unload_events; | |
136 static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids; | |
137 static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins; | |
138 static JavaThread* _current_poster; | |
139 | |
140 // tests if there are CompiledMethodUnload events pending | |
141 inline static bool have_pending_compiled_method_unload_events() { | |
142 return _have_pending_compiled_method_unload_events; | |
143 } | |
144 | |
145 // posts any pending CompiledMethodUnload events. | |
146 static void post_pending_compiled_method_unload_events(); | |
147 | |
148 // posts a DynamicCodeGenerated event (internal/private implementation). | |
149 // The public post_dynamic_code_generated* functions make use of the | |
150 // internal implementation. | |
151 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; | |
152 | |
153 | |
154 // GenerateEvents support to allow posting of CompiledMethodLoad and | |
155 // DynamicCodeGenerated events for a given environment. | |
156 friend class JvmtiCodeBlobEvents; | |
157 | |
158 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, | |
159 const void *code_begin, const jint map_length, | |
160 const jvmtiAddrLocationMap* map) KERNEL_RETURN; | |
161 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, | |
162 const void *code_end) KERNEL_RETURN; | |
163 | |
164 // The RedefineClasses() API breaks some invariants in the "regular" | |
165 // system. For example, there are sanity checks when GC'ing nmethods | |
166 // that require the containing class to be unloading. However, when a | |
167 // method is redefined, the old method and nmethod can become GC'able | |
168 // without the containing class unloading. The state of becoming | |
169 // GC'able can be asynchronous to the RedefineClasses() call since | |
170 // the old method may still be running and cannot be GC'ed until | |
171 // after all old invocations have finished. Additionally, a method | |
172 // that has not been redefined may have an nmethod that depends on | |
173 // the redefined method. The dependent nmethod will get deopted in | |
174 // this case and may also be GC'able without the containing class | |
175 // being unloaded. | |
176 // | |
177 // This flag indicates whether RedefineClasses() has ever redefined | |
178 // one or more classes during the lifetime of the VM. The flag should | |
179 // only be set by the friend class and can be queried by other sub | |
180 // systems as needed to relax invariant checks. | |
181 static bool _has_redefined_a_class; | |
182 friend class VM_RedefineClasses; | |
183 inline static void set_has_redefined_a_class() { | |
184 _has_redefined_a_class = true; | |
185 } | |
186 | |
187 // Flag to indicate if the compiler has recorded all dependencies. When the | |
188 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler | |
189 // records all dependencies from startup. However if the capability is first | |
190 // enabled some time later then the dependencies recorded by the compiler | |
191 // are incomplete. This flag is used by RedefineClasses to know if the | |
192 // dependency information is complete or not. | |
193 static bool _all_dependencies_are_recorded; | |
194 | |
195 public: | |
196 inline static bool has_redefined_a_class() { | |
197 return _has_redefined_a_class; | |
198 } | |
199 | |
200 inline static bool all_dependencies_are_recorded() { | |
201 return _all_dependencies_are_recorded; | |
202 } | |
203 | |
204 inline static void set_all_dependencies_are_recorded(bool on) { | |
205 _all_dependencies_are_recorded = (on != 0); | |
206 } | |
207 | |
208 | |
209 // let JVMTI know that the JVM_OnLoad code is running | |
210 static void enter_onload_phase(); | |
211 | |
212 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) | |
213 static void enter_primordial_phase(); | |
214 | |
215 // let JVMTI know that the VM isn't up yet but JNI is live | |
216 static void enter_start_phase(); | |
217 | |
218 // let JVMTI know that the VM is fully up and running now | |
219 static void enter_live_phase(); | |
220 | |
221 // ------ can_* conditions (below) are set at OnLoad and never changed ------------ | |
222 inline static bool can_examine_or_deopt_anywhere() { return _can_examine_or_deopt_anywhere; } | |
223 inline static bool can_modify_any_class() { return _can_modify_any_class; } | |
224 inline static bool can_access_local_variables() { return _can_access_local_variables; } | |
225 inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; } | |
226 inline static bool can_walk_any_space() { return _can_walk_any_space; } | |
227 | |
228 // field access management | |
229 static address get_field_access_count_addr(); | |
230 | |
231 // field modification management | |
232 static address get_field_modification_count_addr(); | |
233 | |
234 // ----------------- | |
235 | |
236 static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; } | |
237 static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; } | |
238 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version); | |
239 | |
240 // single stepping management methods | |
241 static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
242 static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN; | |
243 static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;); | |
244 | |
245 // Methods that notify the debugger that something interesting has happened in the VM. | |
246 static void post_vm_start (); | |
247 static void post_vm_initialized (); | |
248 static void post_vm_death (); | |
249 | |
250 static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
251 static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
252 | |
253 static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN; | |
254 static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN; | |
255 | |
256 static oop jni_GetField_probe (JavaThread *thread, jobject jobj, | |
257 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
258 KERNEL_RETURN_(return NULL;); | |
259 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, | |
260 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
261 KERNEL_RETURN_(return NULL;); | |
262 static void post_field_access_by_jni (JavaThread *thread, oop obj, | |
263 klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN; | |
264 static void post_field_access (JavaThread *thread, methodOop method, | |
265 address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN; | |
266 static oop jni_SetField_probe (JavaThread *thread, jobject jobj, | |
267 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
268 jvalue *value) KERNEL_RETURN_(return NULL;); | |
269 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, | |
270 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
271 jvalue *value) KERNEL_RETURN_(return NULL;); | |
272 static void post_field_modification_by_jni(JavaThread *thread, oop obj, | |
273 klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
274 jvalue *value); | |
275 static void post_raw_field_modification(JavaThread *thread, methodOop method, | |
276 address location, KlassHandle field_klass, Handle object, jfieldID field, | |
277 char sig_type, jvalue *value) KERNEL_RETURN; | |
278 | |
279 static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
280 static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
281 | |
282 static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
283 static void post_class_unload (klassOop klass) KERNEL_RETURN; | |
284 static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
285 | |
286 static void post_thread_start (JavaThread *thread) KERNEL_RETURN; | |
287 static void post_thread_end (JavaThread *thread) KERNEL_RETURN; | |
288 | |
289 // Support for java.lang.instrument agent loading. | |
290 static bool _should_post_class_file_load_hook; | |
291 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } | |
292 inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; } | |
293 static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader, | |
294 Handle h_protection_domain, | |
295 unsigned char **data_ptr, unsigned char **end_ptr, | |
296 unsigned char **cached_data_ptr, | |
297 jint *cached_length_ptr); | |
298 static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN; | |
299 static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN; | |
300 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; | |
301 | |
302 // used at a safepoint to post a CompiledMethodUnload event | |
303 static void post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) KERNEL_RETURN; | |
304 | |
305 // similiar to post_dynamic_code_generated except that it can be used to | |
306 // post a DynamicCodeGenerated event while holding locks in the VM. Any event | |
307 // posted using this function is recorded by the enclosing event collector | |
308 // -- JvmtiDynamicCodeEventCollector. | |
309 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN; | |
310 | |
311 static void post_garbage_collection_finish() KERNEL_RETURN; | |
312 static void post_garbage_collection_start() KERNEL_RETURN; | |
313 static void post_data_dump() KERNEL_RETURN; | |
314 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
315 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
316 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN; | |
317 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN; | |
318 static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN; | |
319 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN; | |
320 static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN; | |
321 // Post objects collected by vm_object_alloc_event_collector. | |
322 static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN; | |
323 // Collects vm internal objects for later event posting. | |
324 inline static void vm_object_alloc_event_collector(oop object) { | |
325 if (should_post_vm_object_alloc()) { | |
326 record_vm_internal_object_allocation(object); | |
327 } | |
328 } | |
329 | |
330 static void cleanup_thread (JavaThread* thread) KERNEL_RETURN; | |
331 | |
332 static void oops_do(OopClosure* f) KERNEL_RETURN; | |
333 | |
334 static void transition_pending_onload_raw_monitors() KERNEL_RETURN; | |
335 | |
336 #ifndef SERVICES_KERNEL | |
337 // attach support | |
338 static jint load_agent_library(AttachOperation* op, outputStream* out); | |
339 #endif // SERVICES_KERNEL | |
340 | |
341 // SetNativeMethodPrefix support | |
342 static char** get_all_native_method_prefixes(int* count_ptr); | |
343 | |
344 // call after CMS has completed referencing processing | |
345 static void cms_ref_processing_epilogue() KERNEL_RETURN; | |
346 }; | |
347 | |
348 // Support class used by JvmtiDynamicCodeEventCollector and others. It | |
349 // describes a single code blob by name and address range. | |
350 class JvmtiCodeBlobDesc : public CHeapObj { | |
351 private: | |
352 char _name[64]; | |
353 address _code_begin; | |
354 address _code_end; | |
355 | |
356 public: | |
357 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { | |
358 assert(name != NULL, "all code blobs must be named"); | |
359 strncpy(_name, name, sizeof(_name)); | |
360 _name[sizeof(_name)-1] = '\0'; | |
361 _code_begin = code_begin; | |
362 _code_end = code_end; | |
363 } | |
364 char* name() { return _name; } | |
365 address code_begin() { return _code_begin; } | |
366 address code_end() { return _code_end; } | |
367 }; | |
368 | |
369 // JvmtiEventCollector is a helper class to setup thread for | |
370 // event collection. | |
371 class JvmtiEventCollector : public StackObj { | |
372 private: | |
373 JvmtiEventCollector* _prev; // Save previous one to support nested event collector. | |
374 | |
375 public: | |
376 void setup_jvmti_thread_state(); // Set this collector in current thread. | |
377 void unset_jvmti_thread_state(); // Reset previous collector in current thread. | |
378 virtual bool is_dynamic_code_event() { return false; } | |
379 virtual bool is_vm_object_alloc_event(){ return false; } | |
380 JvmtiEventCollector *get_prev() { return _prev; } | |
381 }; | |
382 | |
383 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport | |
384 // interface. It collects "dynamic code generated" events that are posted | |
385 // while holding locks. When the event collector goes out of scope the | |
386 // events will be posted. | |
387 // | |
388 // Usage :- | |
389 // | |
390 // { | |
391 // JvmtiDynamicCodeEventCollector event_collector; | |
392 // : | |
393 // { MutexLocker ml(...) | |
394 // : | |
395 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) | |
396 // } | |
397 // // event collector goes out of scope => post events to profiler. | |
398 // } | |
399 | |
400 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { | |
401 private: | |
402 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events | |
403 | |
404 friend class JvmtiExport; | |
405 void register_stub(const char* name, address start, address end); | |
406 | |
407 public: | |
408 JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
409 ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
410 bool is_dynamic_code_event() { return true; } | |
411 | |
412 }; | |
413 | |
414 // Used to record vm internally allocated object oops and post | |
415 // vm object alloc event for objects visible to java world. | |
416 // Constructor enables JvmtiThreadState flag and all vm allocated | |
417 // objects are recorded in a growable array. When destructor is | |
418 // called the vm object alloc event is posted for each objects | |
419 // visible to java world. | |
420 // See jvm.cpp file for its usage. | |
421 // | |
422 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector { | |
423 private: | |
424 GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop. | |
425 bool _enable; // This flag is enabled in constructor and disabled | |
426 // in destructor before posting event. To avoid | |
427 // collection of objects allocated while running java code inside | |
428 // agent post_vm_object_alloc() event handler. | |
429 | |
430 //GC support | |
431 void oops_do(OopClosure* f); | |
432 | |
433 friend class JvmtiExport; | |
434 // Record vm allocated object oop. | |
435 inline void record_allocation(oop obj); | |
436 | |
437 //GC support | |
438 static void oops_do_for_all_threads(OopClosure* f); | |
439 | |
440 public: | |
441 JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
442 ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
443 bool is_vm_object_alloc_event() { return true; } | |
444 | |
445 bool is_enabled() { return _enable; } | |
446 void set_enabled(bool on) { _enable = on; } | |
447 }; | |
448 | |
449 | |
450 | |
451 // Marker class to disable the posting of VMObjectAlloc events | |
452 // within its scope. | |
453 // | |
454 // Usage :- | |
455 // | |
456 // { | |
457 // NoJvmtiVMObjectAllocMark njm; | |
458 // : | |
459 // // VMObjAlloc event will not be posted | |
460 // JvmtiExport::vm_object_alloc_event_collector(obj); | |
461 // : | |
462 // } | |
463 | |
464 class NoJvmtiVMObjectAllocMark : public StackObj { | |
465 private: | |
466 // enclosing collector if enabled, NULL otherwise | |
467 JvmtiVMObjectAllocEventCollector *_collector; | |
468 | |
469 bool was_enabled() { return _collector != NULL; } | |
470 | |
471 public: | |
472 NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
473 ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
474 }; | |
475 | |
476 | |
477 // Base class for reporting GC events to JVMTI. | |
478 class JvmtiGCMarker : public StackObj { | |
479 private: | |
480 bool _full; // marks a "full" GC | |
481 unsigned int _invocation_count; // GC invocation count | |
482 protected: | |
483 JvmtiGCMarker(bool full) KERNEL_RETURN; // protected | |
484 ~JvmtiGCMarker() KERNEL_RETURN; // protected | |
485 }; | |
486 | |
487 | |
488 // Support class used to report GC events to JVMTI. The class is stack | |
489 // allocated and should be placed in the doit() implementation of all | |
490 // vm operations that do a stop-the-world GC for failed allocation. | |
491 // | |
492 // Usage :- | |
493 // | |
494 // void VM_GenCollectForAllocation::doit() { | |
495 // JvmtiGCForAllocationMarker jgcm; | |
496 // : | |
497 // } | |
498 // | |
499 // If jvmti is not enabled the constructor and destructor is essentially | |
500 // a no-op (no overhead). | |
501 // | |
502 class JvmtiGCForAllocationMarker : public JvmtiGCMarker { | |
503 public: | |
504 JvmtiGCForAllocationMarker() : JvmtiGCMarker(false) { | |
505 } | |
506 }; | |
507 | |
508 // Support class used to report GC events to JVMTI. The class is stack | |
509 // allocated and should be placed in the doit() implementation of all | |
510 // vm operations that do a "full" stop-the-world GC. This class differs | |
511 // from JvmtiGCForAllocationMarker in that this class assumes that a | |
512 // "full" GC will happen. | |
513 // | |
514 // Usage :- | |
515 // | |
516 // void VM_GenCollectFull::doit() { | |
517 // JvmtiGCFullMarker jgcm; | |
518 // : | |
519 // } | |
520 // | |
521 class JvmtiGCFullMarker : public JvmtiGCMarker { | |
522 public: | |
523 JvmtiGCFullMarker() : JvmtiGCMarker(true) { | |
524 } | |
525 }; | |
526 | |
527 | |
528 // JvmtiHideSingleStepping is a helper class for hiding | |
529 // internal single step events. | |
530 class JvmtiHideSingleStepping : public StackObj { | |
531 private: | |
532 bool _single_step_hidden; | |
533 JavaThread * _thread; | |
534 | |
535 public: | |
536 JvmtiHideSingleStepping(JavaThread * thread) { | |
537 assert(thread != NULL, "sanity check"); | |
538 | |
539 _single_step_hidden = false; | |
540 _thread = thread; | |
541 if (JvmtiExport::should_post_single_step()) { | |
542 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); | |
543 } | |
544 } | |
545 | |
546 ~JvmtiHideSingleStepping() { | |
547 if (_single_step_hidden) { | |
548 JvmtiExport::expose_single_stepping(_thread); | |
549 } | |
550 } | |
551 }; | |
552 | |
553 #endif /* _JAVA_JVMTIEXPORT_H_ */ |