Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiExport.hpp @ 1257:7b4415a18c8a
Merge
author | kvn |
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date | Fri, 12 Feb 2010 15:27:36 -0800 |
parents | 6deeaebad47a |
children | b4776199210f |
rev | line source |
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0 | 1 /* |
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2 * Copyright 1998-2010 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_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) | |
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69 JVMTI_SUPPORT_FLAG(can_post_on_exceptions) |
0 | 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) | |
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96 JVMTI_SUPPORT_FLAG(should_post_on_exceptions) |
0 | 97 |
98 // ------ the below maybe don't have to be (but are for now) | |
99 // fixed conditions here ------------ | |
100 // any events can be enabled | |
101 JVMTI_SUPPORT_FLAG(should_post_thread_life) | |
102 JVMTI_SUPPORT_FLAG(should_post_object_free) | |
103 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) | |
104 | |
105 // we are holding objects on the heap - need to talk to GC - e.g. | |
106 // breakpoint info | |
107 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) | |
108 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) | |
109 | |
110 // If flag cannot be implemented, give an error if on=true | |
111 static void report_unsupported(bool on); | |
112 | |
113 // these should only be called by the friend class | |
114 friend class JvmtiManageCapabilities; | |
115 inline static void set_can_examine_or_deopt_anywhere(bool on) { _can_examine_or_deopt_anywhere = (on != 0); } | |
116 inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); } | |
117 inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); } | |
118 inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); } | |
119 inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); } | |
120 | |
121 enum { | |
122 JVMTI_VERSION_MASK = 0x70000000, | |
123 JVMTI_VERSION_VALUE = 0x30000000, | |
124 JVMDI_VERSION_VALUE = 0x20000000 | |
125 }; | |
126 | |
127 static void post_field_modification(JavaThread *thread, methodOop method, address location, | |
128 KlassHandle field_klass, Handle object, jfieldID field, | |
129 char sig_type, jvalue *value); | |
130 | |
131 | |
132 private: | |
133 // CompiledMethodUnload events are reported from the VM thread so they | |
134 // are collected in lists (of jmethodID/addresses) and the events are posted later | |
135 // from threads posting CompieldMethodLoad or DynamicCodeGenerated events. | |
136 static bool _have_pending_compiled_method_unload_events; | |
137 static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids; | |
138 static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins; | |
139 static JavaThread* _current_poster; | |
140 | |
141 // tests if there are CompiledMethodUnload events pending | |
142 inline static bool have_pending_compiled_method_unload_events() { | |
143 return _have_pending_compiled_method_unload_events; | |
144 } | |
145 | |
146 // posts any pending CompiledMethodUnload events. | |
147 static void post_pending_compiled_method_unload_events(); | |
148 | |
149 // posts a DynamicCodeGenerated event (internal/private implementation). | |
150 // The public post_dynamic_code_generated* functions make use of the | |
151 // internal implementation. | |
152 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; | |
153 | |
154 | |
155 // GenerateEvents support to allow posting of CompiledMethodLoad and | |
156 // DynamicCodeGenerated events for a given environment. | |
157 friend class JvmtiCodeBlobEvents; | |
158 | |
159 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, | |
160 const void *code_begin, const jint map_length, | |
161 const jvmtiAddrLocationMap* map) KERNEL_RETURN; | |
162 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, | |
163 const void *code_end) KERNEL_RETURN; | |
164 | |
165 // The RedefineClasses() API breaks some invariants in the "regular" | |
166 // system. For example, there are sanity checks when GC'ing nmethods | |
167 // that require the containing class to be unloading. However, when a | |
168 // method is redefined, the old method and nmethod can become GC'able | |
169 // without the containing class unloading. The state of becoming | |
170 // GC'able can be asynchronous to the RedefineClasses() call since | |
171 // the old method may still be running and cannot be GC'ed until | |
172 // after all old invocations have finished. Additionally, a method | |
173 // that has not been redefined may have an nmethod that depends on | |
174 // the redefined method. The dependent nmethod will get deopted in | |
175 // this case and may also be GC'able without the containing class | |
176 // being unloaded. | |
177 // | |
178 // This flag indicates whether RedefineClasses() has ever redefined | |
179 // one or more classes during the lifetime of the VM. The flag should | |
180 // only be set by the friend class and can be queried by other sub | |
181 // systems as needed to relax invariant checks. | |
182 static bool _has_redefined_a_class; | |
183 friend class VM_RedefineClasses; | |
184 inline static void set_has_redefined_a_class() { | |
185 _has_redefined_a_class = true; | |
186 } | |
187 | |
188 // Flag to indicate if the compiler has recorded all dependencies. When the | |
189 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler | |
190 // records all dependencies from startup. However if the capability is first | |
191 // enabled some time later then the dependencies recorded by the compiler | |
192 // are incomplete. This flag is used by RedefineClasses to know if the | |
193 // dependency information is complete or not. | |
194 static bool _all_dependencies_are_recorded; | |
195 | |
196 public: | |
197 inline static bool has_redefined_a_class() { | |
198 return _has_redefined_a_class; | |
199 } | |
200 | |
201 inline static bool all_dependencies_are_recorded() { | |
202 return _all_dependencies_are_recorded; | |
203 } | |
204 | |
205 inline static void set_all_dependencies_are_recorded(bool on) { | |
206 _all_dependencies_are_recorded = (on != 0); | |
207 } | |
208 | |
209 | |
210 // let JVMTI know that the JVM_OnLoad code is running | |
211 static void enter_onload_phase(); | |
212 | |
213 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) | |
214 static void enter_primordial_phase(); | |
215 | |
216 // let JVMTI know that the VM isn't up yet but JNI is live | |
217 static void enter_start_phase(); | |
218 | |
219 // let JVMTI know that the VM is fully up and running now | |
220 static void enter_live_phase(); | |
221 | |
222 // ------ can_* conditions (below) are set at OnLoad and never changed ------------ | |
223 inline static bool can_examine_or_deopt_anywhere() { return _can_examine_or_deopt_anywhere; } | |
224 inline static bool can_modify_any_class() { return _can_modify_any_class; } | |
225 inline static bool can_access_local_variables() { return _can_access_local_variables; } | |
226 inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; } | |
227 inline static bool can_walk_any_space() { return _can_walk_any_space; } | |
228 | |
229 // field access management | |
230 static address get_field_access_count_addr(); | |
231 | |
232 // field modification management | |
233 static address get_field_modification_count_addr(); | |
234 | |
235 // ----------------- | |
236 | |
237 static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; } | |
238 static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; } | |
239 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version); | |
1121 | 240 static void decode_version_values(jint version, int * major, int * minor, |
241 int * micro); | |
0 | 242 |
243 // single stepping management methods | |
244 static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
245 static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN; | |
246 static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;); | |
247 | |
248 // Methods that notify the debugger that something interesting has happened in the VM. | |
249 static void post_vm_start (); | |
250 static void post_vm_initialized (); | |
251 static void post_vm_death (); | |
252 | |
253 static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
254 static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
255 | |
256 static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN; | |
257 static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN; | |
258 | |
259 static oop jni_GetField_probe (JavaThread *thread, jobject jobj, | |
260 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
261 KERNEL_RETURN_(return NULL;); | |
262 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, | |
263 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
264 KERNEL_RETURN_(return NULL;); | |
265 static void post_field_access_by_jni (JavaThread *thread, oop obj, | |
266 klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN; | |
267 static void post_field_access (JavaThread *thread, methodOop method, | |
268 address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN; | |
269 static oop jni_SetField_probe (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 oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, | |
273 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
274 jvalue *value) KERNEL_RETURN_(return NULL;); | |
275 static void post_field_modification_by_jni(JavaThread *thread, oop obj, | |
276 klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
277 jvalue *value); | |
278 static void post_raw_field_modification(JavaThread *thread, methodOop method, | |
279 address location, KlassHandle field_klass, Handle object, jfieldID field, | |
280 char sig_type, jvalue *value) KERNEL_RETURN; | |
281 | |
282 static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
283 static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
284 | |
285 static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
286 static void post_class_unload (klassOop klass) KERNEL_RETURN; | |
287 static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
288 | |
289 static void post_thread_start (JavaThread *thread) KERNEL_RETURN; | |
290 static void post_thread_end (JavaThread *thread) KERNEL_RETURN; | |
291 | |
292 // Support for java.lang.instrument agent loading. | |
293 static bool _should_post_class_file_load_hook; | |
294 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } | |
295 inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; } | |
296 static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader, | |
297 Handle h_protection_domain, | |
298 unsigned char **data_ptr, unsigned char **end_ptr, | |
299 unsigned char **cached_data_ptr, | |
300 jint *cached_length_ptr); | |
301 static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN; | |
302 static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN; | |
303 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; | |
304 | |
305 // used at a safepoint to post a CompiledMethodUnload event | |
306 static void post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) KERNEL_RETURN; | |
307 | |
308 // similiar to post_dynamic_code_generated except that it can be used to | |
309 // post a DynamicCodeGenerated event while holding locks in the VM. Any event | |
310 // posted using this function is recorded by the enclosing event collector | |
311 // -- JvmtiDynamicCodeEventCollector. | |
312 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN; | |
313 | |
314 static void post_garbage_collection_finish() KERNEL_RETURN; | |
315 static void post_garbage_collection_start() KERNEL_RETURN; | |
316 static void post_data_dump() KERNEL_RETURN; | |
317 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
318 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
319 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN; | |
320 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN; | |
321 static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN; | |
322 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN; | |
323 static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN; | |
324 // Post objects collected by vm_object_alloc_event_collector. | |
325 static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN; | |
326 // Collects vm internal objects for later event posting. | |
327 inline static void vm_object_alloc_event_collector(oop object) { | |
328 if (should_post_vm_object_alloc()) { | |
329 record_vm_internal_object_allocation(object); | |
330 } | |
331 } | |
332 | |
333 static void cleanup_thread (JavaThread* thread) KERNEL_RETURN; | |
334 | |
335 static void oops_do(OopClosure* f) KERNEL_RETURN; | |
336 | |
337 static void transition_pending_onload_raw_monitors() KERNEL_RETURN; | |
338 | |
339 #ifndef SERVICES_KERNEL | |
340 // attach support | |
341 static jint load_agent_library(AttachOperation* op, outputStream* out); | |
342 #endif // SERVICES_KERNEL | |
343 | |
344 // SetNativeMethodPrefix support | |
345 static char** get_all_native_method_prefixes(int* count_ptr); | |
346 | |
347 // call after CMS has completed referencing processing | |
348 static void cms_ref_processing_epilogue() KERNEL_RETURN; | |
349 }; | |
350 | |
351 // Support class used by JvmtiDynamicCodeEventCollector and others. It | |
352 // describes a single code blob by name and address range. | |
353 class JvmtiCodeBlobDesc : public CHeapObj { | |
354 private: | |
355 char _name[64]; | |
356 address _code_begin; | |
357 address _code_end; | |
358 | |
359 public: | |
360 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { | |
361 assert(name != NULL, "all code blobs must be named"); | |
362 strncpy(_name, name, sizeof(_name)); | |
363 _name[sizeof(_name)-1] = '\0'; | |
364 _code_begin = code_begin; | |
365 _code_end = code_end; | |
366 } | |
367 char* name() { return _name; } | |
368 address code_begin() { return _code_begin; } | |
369 address code_end() { return _code_end; } | |
370 }; | |
371 | |
372 // JvmtiEventCollector is a helper class to setup thread for | |
373 // event collection. | |
374 class JvmtiEventCollector : public StackObj { | |
375 private: | |
376 JvmtiEventCollector* _prev; // Save previous one to support nested event collector. | |
377 | |
378 public: | |
379 void setup_jvmti_thread_state(); // Set this collector in current thread. | |
380 void unset_jvmti_thread_state(); // Reset previous collector in current thread. | |
381 virtual bool is_dynamic_code_event() { return false; } | |
382 virtual bool is_vm_object_alloc_event(){ return false; } | |
383 JvmtiEventCollector *get_prev() { return _prev; } | |
384 }; | |
385 | |
386 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport | |
387 // interface. It collects "dynamic code generated" events that are posted | |
388 // while holding locks. When the event collector goes out of scope the | |
389 // events will be posted. | |
390 // | |
391 // Usage :- | |
392 // | |
393 // { | |
394 // JvmtiDynamicCodeEventCollector event_collector; | |
395 // : | |
396 // { MutexLocker ml(...) | |
397 // : | |
398 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) | |
399 // } | |
400 // // event collector goes out of scope => post events to profiler. | |
401 // } | |
402 | |
403 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { | |
404 private: | |
405 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events | |
406 | |
407 friend class JvmtiExport; | |
408 void register_stub(const char* name, address start, address end); | |
409 | |
410 public: | |
411 JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
412 ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
413 bool is_dynamic_code_event() { return true; } | |
414 | |
415 }; | |
416 | |
417 // Used to record vm internally allocated object oops and post | |
418 // vm object alloc event for objects visible to java world. | |
419 // Constructor enables JvmtiThreadState flag and all vm allocated | |
420 // objects are recorded in a growable array. When destructor is | |
421 // called the vm object alloc event is posted for each objects | |
422 // visible to java world. | |
423 // See jvm.cpp file for its usage. | |
424 // | |
425 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector { | |
426 private: | |
427 GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop. | |
428 bool _enable; // This flag is enabled in constructor and disabled | |
429 // in destructor before posting event. To avoid | |
430 // collection of objects allocated while running java code inside | |
431 // agent post_vm_object_alloc() event handler. | |
432 | |
433 //GC support | |
434 void oops_do(OopClosure* f); | |
435 | |
436 friend class JvmtiExport; | |
437 // Record vm allocated object oop. | |
438 inline void record_allocation(oop obj); | |
439 | |
440 //GC support | |
441 static void oops_do_for_all_threads(OopClosure* f); | |
442 | |
443 public: | |
444 JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
445 ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
446 bool is_vm_object_alloc_event() { return true; } | |
447 | |
448 bool is_enabled() { return _enable; } | |
449 void set_enabled(bool on) { _enable = on; } | |
450 }; | |
451 | |
452 | |
453 | |
454 // Marker class to disable the posting of VMObjectAlloc events | |
455 // within its scope. | |
456 // | |
457 // Usage :- | |
458 // | |
459 // { | |
460 // NoJvmtiVMObjectAllocMark njm; | |
461 // : | |
462 // // VMObjAlloc event will not be posted | |
463 // JvmtiExport::vm_object_alloc_event_collector(obj); | |
464 // : | |
465 // } | |
466 | |
467 class NoJvmtiVMObjectAllocMark : public StackObj { | |
468 private: | |
469 // enclosing collector if enabled, NULL otherwise | |
470 JvmtiVMObjectAllocEventCollector *_collector; | |
471 | |
472 bool was_enabled() { return _collector != NULL; } | |
473 | |
474 public: | |
475 NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
476 ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
477 }; | |
478 | |
479 | |
480 // Base class for reporting GC events to JVMTI. | |
481 class JvmtiGCMarker : public StackObj { | |
482 private: | |
483 bool _full; // marks a "full" GC | |
484 unsigned int _invocation_count; // GC invocation count | |
485 protected: | |
486 JvmtiGCMarker(bool full) KERNEL_RETURN; // protected | |
487 ~JvmtiGCMarker() KERNEL_RETURN; // protected | |
488 }; | |
489 | |
490 | |
491 // Support class used to report GC events to JVMTI. The class is stack | |
492 // allocated and should be placed in the doit() implementation of all | |
493 // vm operations that do a stop-the-world GC for failed allocation. | |
494 // | |
495 // Usage :- | |
496 // | |
497 // void VM_GenCollectForAllocation::doit() { | |
498 // JvmtiGCForAllocationMarker jgcm; | |
499 // : | |
500 // } | |
501 // | |
502 // If jvmti is not enabled the constructor and destructor is essentially | |
503 // a no-op (no overhead). | |
504 // | |
505 class JvmtiGCForAllocationMarker : public JvmtiGCMarker { | |
506 public: | |
507 JvmtiGCForAllocationMarker() : JvmtiGCMarker(false) { | |
508 } | |
509 }; | |
510 | |
511 // Support class used to report GC events to JVMTI. The class is stack | |
512 // allocated and should be placed in the doit() implementation of all | |
513 // vm operations that do a "full" stop-the-world GC. This class differs | |
514 // from JvmtiGCForAllocationMarker in that this class assumes that a | |
515 // "full" GC will happen. | |
516 // | |
517 // Usage :- | |
518 // | |
519 // void VM_GenCollectFull::doit() { | |
520 // JvmtiGCFullMarker jgcm; | |
521 // : | |
522 // } | |
523 // | |
524 class JvmtiGCFullMarker : public JvmtiGCMarker { | |
525 public: | |
526 JvmtiGCFullMarker() : JvmtiGCMarker(true) { | |
527 } | |
528 }; | |
529 | |
530 | |
531 // JvmtiHideSingleStepping is a helper class for hiding | |
532 // internal single step events. | |
533 class JvmtiHideSingleStepping : public StackObj { | |
534 private: | |
535 bool _single_step_hidden; | |
536 JavaThread * _thread; | |
537 | |
538 public: | |
539 JvmtiHideSingleStepping(JavaThread * thread) { | |
540 assert(thread != NULL, "sanity check"); | |
541 | |
542 _single_step_hidden = false; | |
543 _thread = thread; | |
544 if (JvmtiExport::should_post_single_step()) { | |
545 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); | |
546 } | |
547 } | |
548 | |
549 ~JvmtiHideSingleStepping() { | |
550 if (_single_step_hidden) { | |
551 JvmtiExport::expose_single_stepping(_thread); | |
552 } | |
553 } | |
554 }; | |
555 | |
556 #endif /* _JAVA_JVMTIEXPORT_H_ */ |