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annotate src/share/vm/prims/jvmtiExport.hpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTIEXPORT_HPP |
26 #define SHARE_VM_PRIMS_JVMTIEXPORT_HPP | |
27 | |
28 #include "jvmtifiles/jvmti.h" | |
29 #include "memory/allocation.hpp" | |
30 #include "memory/iterator.hpp" | |
31 #include "oops/oop.hpp" | |
32 #include "oops/oopsHierarchy.hpp" | |
33 #include "runtime/frame.hpp" | |
34 #include "runtime/handles.hpp" | |
35 #include "utilities/globalDefinitions.hpp" | |
36 #include "utilities/growableArray.hpp" | |
0 | 37 |
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38 // Must be included after jvmti.h. |
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39 #include "code/jvmticmlr.h" |
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40 |
0 | 41 // Forward declarations |
42 | |
43 class JvmtiEventControllerPrivate; | |
44 class JvmtiManageCapabilities; | |
45 class JvmtiEnv; | |
46 class JvmtiThreadState; | |
47 class AttachOperation; | |
48 | |
49 #ifndef JVMTI_KERNEL | |
50 #define JVMTI_SUPPORT_FLAG(key) \ | |
51 private: \ | |
52 static bool _##key; \ | |
53 public: \ | |
54 inline static void set_##key(bool on) { _##key = (on != 0); } \ | |
55 inline static bool key() { return _##key; } | |
56 #else // JVMTI_KERNEL | |
57 #define JVMTI_SUPPORT_FLAG(key) \ | |
58 private: \ | |
59 const static bool _##key = false; \ | |
60 public: \ | |
61 inline static void set_##key(bool on) { report_unsupported(on); } \ | |
62 inline static bool key() { return _##key; } | |
63 #endif // JVMTI_KERNEL | |
64 | |
65 | |
66 // This class contains the JVMTI interface for the rest of hotspot. | |
67 // | |
68 class JvmtiExport : public AllStatic { | |
69 private: | |
70 static int _field_access_count; | |
71 static int _field_modification_count; | |
72 | |
73 static bool _can_access_local_variables; | |
74 static bool _can_hotswap_or_post_breakpoint; | |
75 static bool _can_modify_any_class; | |
76 static bool _can_walk_any_space; | |
77 | |
78 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension) | |
79 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order) | |
80 JVMTI_SUPPORT_FLAG(can_post_interpreter_events) | |
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81 JVMTI_SUPPORT_FLAG(can_post_on_exceptions) |
0 | 82 JVMTI_SUPPORT_FLAG(can_post_breakpoint) |
83 JVMTI_SUPPORT_FLAG(can_post_field_access) | |
84 JVMTI_SUPPORT_FLAG(can_post_field_modification) | |
85 JVMTI_SUPPORT_FLAG(can_post_method_entry) | |
86 JVMTI_SUPPORT_FLAG(can_post_method_exit) | |
87 JVMTI_SUPPORT_FLAG(can_pop_frame) | |
88 JVMTI_SUPPORT_FLAG(can_force_early_return) | |
89 | |
90 friend class JvmtiEventControllerPrivate; // should only modify these flags | |
91 JVMTI_SUPPORT_FLAG(should_post_single_step) | |
92 JVMTI_SUPPORT_FLAG(should_post_field_access) | |
93 JVMTI_SUPPORT_FLAG(should_post_field_modification) | |
94 JVMTI_SUPPORT_FLAG(should_post_class_load) | |
95 JVMTI_SUPPORT_FLAG(should_post_class_prepare) | |
96 JVMTI_SUPPORT_FLAG(should_post_class_unload) | |
97 JVMTI_SUPPORT_FLAG(should_post_native_method_bind) | |
98 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load) | |
99 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload) | |
100 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated) | |
101 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter) | |
102 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered) | |
103 JVMTI_SUPPORT_FLAG(should_post_monitor_wait) | |
104 JVMTI_SUPPORT_FLAG(should_post_monitor_waited) | |
105 JVMTI_SUPPORT_FLAG(should_post_data_dump) | |
106 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start) | |
107 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish) | |
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108 JVMTI_SUPPORT_FLAG(should_post_on_exceptions) |
0 | 109 |
110 // ------ the below maybe don't have to be (but are for now) | |
111 // fixed conditions here ------------ | |
112 // any events can be enabled | |
113 JVMTI_SUPPORT_FLAG(should_post_thread_life) | |
114 JVMTI_SUPPORT_FLAG(should_post_object_free) | |
115 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) | |
116 | |
117 // we are holding objects on the heap - need to talk to GC - e.g. | |
118 // breakpoint info | |
119 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) | |
120 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) | |
121 | |
122 // If flag cannot be implemented, give an error if on=true | |
123 static void report_unsupported(bool on); | |
124 | |
125 // these should only be called by the friend class | |
126 friend class JvmtiManageCapabilities; | |
127 inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); } | |
128 inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); } | |
129 inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); } | |
130 inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); } | |
131 | |
132 enum { | |
133 JVMTI_VERSION_MASK = 0x70000000, | |
134 JVMTI_VERSION_VALUE = 0x30000000, | |
135 JVMDI_VERSION_VALUE = 0x20000000 | |
136 }; | |
137 | |
138 static void post_field_modification(JavaThread *thread, methodOop method, address location, | |
139 KlassHandle field_klass, Handle object, jfieldID field, | |
140 char sig_type, jvalue *value); | |
141 | |
142 | |
143 // posts a DynamicCodeGenerated event (internal/private implementation). | |
144 // The public post_dynamic_code_generated* functions make use of the | |
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145 // internal implementation. Also called from JvmtiDeferredEvent::post() |
0 | 146 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; |
147 | |
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148 private: |
0 | 149 |
150 // GenerateEvents support to allow posting of CompiledMethodLoad and | |
151 // DynamicCodeGenerated events for a given environment. | |
152 friend class JvmtiCodeBlobEvents; | |
153 | |
154 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, | |
155 const void *code_begin, const jint map_length, | |
156 const jvmtiAddrLocationMap* map) KERNEL_RETURN; | |
157 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, | |
158 const void *code_end) KERNEL_RETURN; | |
159 | |
160 // The RedefineClasses() API breaks some invariants in the "regular" | |
161 // system. For example, there are sanity checks when GC'ing nmethods | |
162 // that require the containing class to be unloading. However, when a | |
163 // method is redefined, the old method and nmethod can become GC'able | |
164 // without the containing class unloading. The state of becoming | |
165 // GC'able can be asynchronous to the RedefineClasses() call since | |
166 // the old method may still be running and cannot be GC'ed until | |
167 // after all old invocations have finished. Additionally, a method | |
168 // that has not been redefined may have an nmethod that depends on | |
169 // the redefined method. The dependent nmethod will get deopted in | |
170 // this case and may also be GC'able without the containing class | |
171 // being unloaded. | |
172 // | |
173 // This flag indicates whether RedefineClasses() has ever redefined | |
174 // one or more classes during the lifetime of the VM. The flag should | |
175 // only be set by the friend class and can be queried by other sub | |
176 // systems as needed to relax invariant checks. | |
177 static bool _has_redefined_a_class; | |
178 friend class VM_RedefineClasses; | |
179 inline static void set_has_redefined_a_class() { | |
180 _has_redefined_a_class = true; | |
181 } | |
182 | |
183 // Flag to indicate if the compiler has recorded all dependencies. When the | |
184 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler | |
185 // records all dependencies from startup. However if the capability is first | |
186 // enabled some time later then the dependencies recorded by the compiler | |
187 // are incomplete. This flag is used by RedefineClasses to know if the | |
188 // dependency information is complete or not. | |
189 static bool _all_dependencies_are_recorded; | |
190 | |
191 public: | |
192 inline static bool has_redefined_a_class() { | |
193 return _has_redefined_a_class; | |
194 } | |
195 | |
196 inline static bool all_dependencies_are_recorded() { | |
197 return _all_dependencies_are_recorded; | |
198 } | |
199 | |
200 inline static void set_all_dependencies_are_recorded(bool on) { | |
201 _all_dependencies_are_recorded = (on != 0); | |
202 } | |
203 | |
204 | |
205 // let JVMTI know that the JVM_OnLoad code is running | |
206 static void enter_onload_phase(); | |
207 | |
208 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) | |
209 static void enter_primordial_phase(); | |
210 | |
211 // let JVMTI know that the VM isn't up yet but JNI is live | |
212 static void enter_start_phase(); | |
213 | |
214 // let JVMTI know that the VM is fully up and running now | |
215 static void enter_live_phase(); | |
216 | |
217 // ------ can_* conditions (below) are set at OnLoad and never changed ------------ | |
218 inline static bool can_modify_any_class() { return _can_modify_any_class; } | |
219 inline static bool can_access_local_variables() { return _can_access_local_variables; } | |
220 inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; } | |
221 inline static bool can_walk_any_space() { return _can_walk_any_space; } | |
222 | |
223 // field access management | |
224 static address get_field_access_count_addr(); | |
225 | |
226 // field modification management | |
227 static address get_field_modification_count_addr(); | |
228 | |
229 // ----------------- | |
230 | |
231 static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; } | |
232 static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; } | |
233 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version); | |
1121 | 234 static void decode_version_values(jint version, int * major, int * minor, |
235 int * micro); | |
0 | 236 |
237 // single stepping management methods | |
238 static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
239 static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN; | |
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240 static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(false); |
0 | 241 |
242 // Methods that notify the debugger that something interesting has happened in the VM. | |
243 static void post_vm_start (); | |
244 static void post_vm_initialized (); | |
245 static void post_vm_death (); | |
246 | |
247 static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
248 static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; | |
249 | |
250 static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN; | |
251 static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN; | |
252 | |
253 static oop jni_GetField_probe (JavaThread *thread, jobject jobj, | |
254 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
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255 KERNEL_RETURN_(NULL); |
0 | 256 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, |
257 oop obj, klassOop klass, jfieldID fieldID, bool is_static) | |
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258 KERNEL_RETURN_(NULL); |
0 | 259 static void post_field_access_by_jni (JavaThread *thread, oop obj, |
260 klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN; | |
261 static void post_field_access (JavaThread *thread, methodOop method, | |
262 address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN; | |
263 static oop jni_SetField_probe (JavaThread *thread, jobject jobj, | |
264 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
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265 jvalue *value) KERNEL_RETURN_(NULL); |
0 | 266 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, |
267 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
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268 jvalue *value) KERNEL_RETURN_(NULL); |
0 | 269 static void post_field_modification_by_jni(JavaThread *thread, oop obj, |
270 klassOop klass, jfieldID fieldID, bool is_static, char sig_type, | |
271 jvalue *value); | |
272 static void post_raw_field_modification(JavaThread *thread, methodOop method, | |
273 address location, KlassHandle field_klass, Handle object, jfieldID field, | |
274 char sig_type, jvalue *value) KERNEL_RETURN; | |
275 | |
276 static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
277 static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; | |
278 | |
279 static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
280 static void post_class_unload (klassOop klass) KERNEL_RETURN; | |
281 static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN; | |
282 | |
283 static void post_thread_start (JavaThread *thread) KERNEL_RETURN; | |
284 static void post_thread_end (JavaThread *thread) KERNEL_RETURN; | |
285 | |
286 // Support for java.lang.instrument agent loading. | |
287 static bool _should_post_class_file_load_hook; | |
288 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } | |
289 inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; } | |
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290 static void post_class_file_load_hook(Symbol* h_name, Handle class_loader, |
0 | 291 Handle h_protection_domain, |
292 unsigned char **data_ptr, unsigned char **end_ptr, | |
293 unsigned char **cached_data_ptr, | |
294 jint *cached_length_ptr); | |
295 static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN; | |
296 static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN; | |
297 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; | |
298 | |
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299 // used to post a CompiledMethodUnload event |
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300 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) KERNEL_RETURN; |
0 | 301 |
302 // similiar to post_dynamic_code_generated except that it can be used to | |
303 // post a DynamicCodeGenerated event while holding locks in the VM. Any event | |
304 // posted using this function is recorded by the enclosing event collector | |
305 // -- JvmtiDynamicCodeEventCollector. | |
306 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN; | |
307 | |
308 static void post_garbage_collection_finish() KERNEL_RETURN; | |
309 static void post_garbage_collection_start() KERNEL_RETURN; | |
310 static void post_data_dump() KERNEL_RETURN; | |
311 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
312 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; | |
313 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN; | |
314 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN; | |
315 static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN; | |
316 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN; | |
317 static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN; | |
318 // Post objects collected by vm_object_alloc_event_collector. | |
319 static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN; | |
320 // Collects vm internal objects for later event posting. | |
321 inline static void vm_object_alloc_event_collector(oop object) { | |
322 if (should_post_vm_object_alloc()) { | |
323 record_vm_internal_object_allocation(object); | |
324 } | |
325 } | |
326 | |
327 static void cleanup_thread (JavaThread* thread) KERNEL_RETURN; | |
328 | |
329 static void oops_do(OopClosure* f) KERNEL_RETURN; | |
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330 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) KERNEL_RETURN; |
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331 static void gc_epilogue() KERNEL_RETURN; |
0 | 332 |
333 static void transition_pending_onload_raw_monitors() KERNEL_RETURN; | |
334 | |
335 #ifndef SERVICES_KERNEL | |
336 // attach support | |
337 static jint load_agent_library(AttachOperation* op, outputStream* out); | |
338 #endif // SERVICES_KERNEL | |
339 | |
340 // SetNativeMethodPrefix support | |
341 static char** get_all_native_method_prefixes(int* count_ptr); | |
342 }; | |
343 | |
344 // Support class used by JvmtiDynamicCodeEventCollector and others. It | |
345 // describes a single code blob by name and address range. | |
346 class JvmtiCodeBlobDesc : public CHeapObj { | |
347 private: | |
348 char _name[64]; | |
349 address _code_begin; | |
350 address _code_end; | |
351 | |
352 public: | |
353 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { | |
354 assert(name != NULL, "all code blobs must be named"); | |
355 strncpy(_name, name, sizeof(_name)); | |
356 _name[sizeof(_name)-1] = '\0'; | |
357 _code_begin = code_begin; | |
358 _code_end = code_end; | |
359 } | |
360 char* name() { return _name; } | |
361 address code_begin() { return _code_begin; } | |
362 address code_end() { return _code_end; } | |
363 }; | |
364 | |
365 // JvmtiEventCollector is a helper class to setup thread for | |
366 // event collection. | |
367 class JvmtiEventCollector : public StackObj { | |
368 private: | |
369 JvmtiEventCollector* _prev; // Save previous one to support nested event collector. | |
370 | |
371 public: | |
372 void setup_jvmti_thread_state(); // Set this collector in current thread. | |
373 void unset_jvmti_thread_state(); // Reset previous collector in current thread. | |
374 virtual bool is_dynamic_code_event() { return false; } | |
375 virtual bool is_vm_object_alloc_event(){ return false; } | |
376 JvmtiEventCollector *get_prev() { return _prev; } | |
377 }; | |
378 | |
379 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport | |
380 // interface. It collects "dynamic code generated" events that are posted | |
381 // while holding locks. When the event collector goes out of scope the | |
382 // events will be posted. | |
383 // | |
384 // Usage :- | |
385 // | |
386 // { | |
387 // JvmtiDynamicCodeEventCollector event_collector; | |
388 // : | |
389 // { MutexLocker ml(...) | |
390 // : | |
391 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) | |
392 // } | |
393 // // event collector goes out of scope => post events to profiler. | |
394 // } | |
395 | |
396 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { | |
397 private: | |
398 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events | |
399 | |
400 friend class JvmtiExport; | |
401 void register_stub(const char* name, address start, address end); | |
402 | |
403 public: | |
404 JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
405 ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN; | |
406 bool is_dynamic_code_event() { return true; } | |
407 | |
408 }; | |
409 | |
410 // Used to record vm internally allocated object oops and post | |
411 // vm object alloc event for objects visible to java world. | |
412 // Constructor enables JvmtiThreadState flag and all vm allocated | |
413 // objects are recorded in a growable array. When destructor is | |
414 // called the vm object alloc event is posted for each objects | |
415 // visible to java world. | |
416 // See jvm.cpp file for its usage. | |
417 // | |
418 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector { | |
419 private: | |
420 GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop. | |
421 bool _enable; // This flag is enabled in constructor and disabled | |
422 // in destructor before posting event. To avoid | |
423 // collection of objects allocated while running java code inside | |
424 // agent post_vm_object_alloc() event handler. | |
425 | |
426 //GC support | |
427 void oops_do(OopClosure* f); | |
428 | |
429 friend class JvmtiExport; | |
430 // Record vm allocated object oop. | |
431 inline void record_allocation(oop obj); | |
432 | |
433 //GC support | |
434 static void oops_do_for_all_threads(OopClosure* f); | |
435 | |
436 public: | |
437 JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
438 ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; | |
439 bool is_vm_object_alloc_event() { return true; } | |
440 | |
441 bool is_enabled() { return _enable; } | |
442 void set_enabled(bool on) { _enable = on; } | |
443 }; | |
444 | |
445 | |
446 | |
447 // Marker class to disable the posting of VMObjectAlloc events | |
448 // within its scope. | |
449 // | |
450 // Usage :- | |
451 // | |
452 // { | |
453 // NoJvmtiVMObjectAllocMark njm; | |
454 // : | |
455 // // VMObjAlloc event will not be posted | |
456 // JvmtiExport::vm_object_alloc_event_collector(obj); | |
457 // : | |
458 // } | |
459 | |
460 class NoJvmtiVMObjectAllocMark : public StackObj { | |
461 private: | |
462 // enclosing collector if enabled, NULL otherwise | |
463 JvmtiVMObjectAllocEventCollector *_collector; | |
464 | |
465 bool was_enabled() { return _collector != NULL; } | |
466 | |
467 public: | |
468 NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
469 ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN; | |
470 }; | |
471 | |
472 | |
473 // Base class for reporting GC events to JVMTI. | |
474 class JvmtiGCMarker : public StackObj { | |
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475 public: |
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476 JvmtiGCMarker() KERNEL_RETURN; |
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477 ~JvmtiGCMarker() KERNEL_RETURN; |
0 | 478 }; |
479 | |
480 // JvmtiHideSingleStepping is a helper class for hiding | |
481 // internal single step events. | |
482 class JvmtiHideSingleStepping : public StackObj { | |
483 private: | |
484 bool _single_step_hidden; | |
485 JavaThread * _thread; | |
486 | |
487 public: | |
488 JvmtiHideSingleStepping(JavaThread * thread) { | |
489 assert(thread != NULL, "sanity check"); | |
490 | |
491 _single_step_hidden = false; | |
492 _thread = thread; | |
493 if (JvmtiExport::should_post_single_step()) { | |
494 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); | |
495 } | |
496 } | |
497 | |
498 ~JvmtiHideSingleStepping() { | |
499 if (_single_step_hidden) { | |
500 JvmtiExport::expose_single_stepping(_thread); | |
501 } | |
502 } | |
503 }; | |
504 | |
1972 | 505 #endif // SHARE_VM_PRIMS_JVMTIEXPORT_HPP |