1 /*
2 * Copyright (c) 1998, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
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"
37 #include "utilities/macros.hpp"
38
39 // Must be included after jvmti.h.
40 #include "jvmticmlr.h"
41
42 // Forward declarations
43
44 class JvmtiEventControllerPrivate;
45 class JvmtiManageCapabilities;
46 class JvmtiEnv;
47 class JvmtiThreadState;
48
49 #define JVMTI_SUPPORT_FLAG(key) \
50 private: \
51 static bool _##key; \
52 public: \
53 inline static void set_##key(bool on) { \
54 JVMTI_ONLY(_##key = (on != 0)); \
55 NOT_JVMTI(report_unsupported(on)); \
56 } \
57 inline static bool key() { \
58 JVMTI_ONLY(return _##key); \
59 NOT_JVMTI(return false); \
60 }
61
62
63 // This class contains the JVMTI interface for the rest of hotspot.
64 //
65 class JvmtiExport : public AllStatic {
66 friend class VMStructs;
67 friend class CompileReplay;
68
69 private:
70
71 #if INCLUDE_JVMTI
72 static int _field_access_count;
73 static int _field_modification_count;
74
75 static bool _can_access_local_variables;
76 static bool _can_hotswap_or_post_breakpoint;
77 static bool _can_modify_any_class;
78 static bool _can_walk_any_space;
79 #endif // INCLUDE_JVMTI
80
81 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)
82 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)
83 JVMTI_SUPPORT_FLAG(can_post_interpreter_events)
84 JVMTI_SUPPORT_FLAG(can_post_on_exceptions)
85 JVMTI_SUPPORT_FLAG(can_post_breakpoint)
86 JVMTI_SUPPORT_FLAG(can_post_field_access)
87 JVMTI_SUPPORT_FLAG(can_post_field_modification)
88 JVMTI_SUPPORT_FLAG(can_post_method_entry)
89 JVMTI_SUPPORT_FLAG(can_post_method_exit)
90 JVMTI_SUPPORT_FLAG(can_pop_frame)
91 JVMTI_SUPPORT_FLAG(can_force_early_return)
92
93 JVMTI_SUPPORT_FLAG(early_vmstart_recorded)
94
95 friend class JvmtiEventControllerPrivate; // should only modify these flags
96 JVMTI_SUPPORT_FLAG(should_post_single_step)
97 JVMTI_SUPPORT_FLAG(should_post_field_access)
98 JVMTI_SUPPORT_FLAG(should_post_field_modification)
99 JVMTI_SUPPORT_FLAG(should_post_class_load)
100 JVMTI_SUPPORT_FLAG(should_post_class_prepare)
101 JVMTI_SUPPORT_FLAG(should_post_class_unload)
102 JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
103 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
104 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
105 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
106 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
107 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
108 JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
109 JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
110 JVMTI_SUPPORT_FLAG(should_post_data_dump)
111 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
112 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
113 JVMTI_SUPPORT_FLAG(should_post_on_exceptions)
114
115 // ------ the below maybe don't have to be (but are for now)
116 // fixed conditions here ------------
117 // any events can be enabled
118 JVMTI_SUPPORT_FLAG(should_post_thread_life)
119 JVMTI_SUPPORT_FLAG(should_post_object_free)
120 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
121
122 // we are holding objects on the heap - need to talk to GC - e.g.
123 // breakpoint info
124 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
125 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
126 JVMTI_SUPPORT_FLAG(should_post_sampled_object_alloc)
127
128 // If flag cannot be implemented, give an error if on=true
129 static void report_unsupported(bool on);
130
131 // these should only be called by the friend class
132 friend class JvmtiManageCapabilities;
133 inline static void set_can_modify_any_class(bool on) {
134 JVMTI_ONLY(_can_modify_any_class = (on != 0);)
135 }
136 inline static void set_can_access_local_variables(bool on) {
137 JVMTI_ONLY(_can_access_local_variables = (on != 0);)
138 }
139 inline static void set_can_hotswap_or_post_breakpoint(bool on) {
140 JVMTI_ONLY(_can_hotswap_or_post_breakpoint = (on != 0);)
141 }
142 inline static void set_can_walk_any_space(bool on) {
143 JVMTI_ONLY(_can_walk_any_space = (on != 0);)
144 }
145
146 enum {
147 JVMTI_VERSION_MASK = 0x70000000,
148 JVMTI_VERSION_VALUE = 0x30000000,
149 JVMDI_VERSION_VALUE = 0x20000000
150 };
151
152 static void post_field_modification(JavaThread *thread, Method* method, address location,
153 Klass* field_klass, Handle object, jfieldID field,
154 char sig_type, jvalue *value);
155
156
157 // posts a DynamicCodeGenerated event (internal/private implementation).
158 // The public post_dynamic_code_generated* functions make use of the
159 // internal implementation. Also called from JvmtiDeferredEvent::post()
160 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN;
161
162 private:
163
164 // GenerateEvents support to allow posting of CompiledMethodLoad and
165 // DynamicCodeGenerated events for a given environment.
166 friend class JvmtiCodeBlobEvents;
167
168 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
169 const void *code_begin, const jint map_length,
170 const jvmtiAddrLocationMap* map) NOT_JVMTI_RETURN;
171 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
172 const void *code_end) NOT_JVMTI_RETURN;
173
174 // This flag indicates whether RedefineClasses() has ever redefined
175 // one or more classes during the lifetime of the VM. The flag should
176 // only be set by the friend class and can be queried by other sub
177 // systems as needed to relax invariant checks.
178 static bool _has_redefined_a_class;
179 friend class VM_RedefineClasses;
180 inline static void set_has_redefined_a_class() {
181 JVMTI_ONLY(_has_redefined_a_class = true;)
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 JVMTI_ONLY(return _has_redefined_a_class);
194 NOT_JVMTI(return false);
195 }
196
197 inline static bool all_dependencies_are_recorded() {
198 return _all_dependencies_are_recorded;
199 }
200
201 inline static void set_all_dependencies_are_recorded(bool on) {
202 _all_dependencies_are_recorded = (on != 0);
203 }
204
205 // Add read edges to the unnamed modules of the bootstrap and app class loaders
206 static void add_default_read_edges(Handle h_module, TRAPS) NOT_JVMTI_RETURN;
207
208 // Add a read edge to the module
209 static jvmtiError add_module_reads(Handle module, Handle to_module, TRAPS);
210
211 // Updates a module to export a package
212 static jvmtiError add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS);
213
214 // Updates a module to open a package
215 static jvmtiError add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS);
216
217 // Add a used service to the module
218 static jvmtiError add_module_uses(Handle module, Handle service, TRAPS);
219
220 // Add a service provider to the module
221 static jvmtiError add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS);
222
223 // let JVMTI know that the JVM_OnLoad code is running
224 static void enter_onload_phase() NOT_JVMTI_RETURN;
225
226 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
227 static void enter_primordial_phase() NOT_JVMTI_RETURN;
228
229 // let JVMTI know that the VM isn't up yet but JNI is live
230 static void enter_early_start_phase() NOT_JVMTI_RETURN;
231 static void enter_start_phase() NOT_JVMTI_RETURN;
232
233 // let JVMTI know that the VM is fully up and running now
234 static void enter_live_phase() NOT_JVMTI_RETURN;
235
236 // ------ can_* conditions (below) are set at OnLoad and never changed ------------
237 inline static bool can_modify_any_class() {
238 JVMTI_ONLY(return _can_modify_any_class);
239 NOT_JVMTI(return false);
240 }
241 inline static bool can_access_local_variables() {
242 JVMTI_ONLY(return _can_access_local_variables);
243 NOT_JVMTI(return false);
244 }
245 inline static bool can_hotswap_or_post_breakpoint() {
246 JVMTI_ONLY(return _can_hotswap_or_post_breakpoint);
247 NOT_JVMTI(return false);
248 }
249 inline static bool can_walk_any_space() {
250 JVMTI_ONLY(return _can_walk_any_space);
251 NOT_JVMTI(return false);
252 }
253
254 // field access management
255 static address get_field_access_count_addr() NOT_JVMTI_RETURN_(0);
256
257 // field modification management
258 static address get_field_modification_count_addr() NOT_JVMTI_RETURN_(0);
259
260 // -----------------
261
262 static bool is_jvmti_version(jint version) {
263 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE);
264 NOT_JVMTI(return false);
265 }
266 static bool is_jvmdi_version(jint version) {
267 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE);
268 NOT_JVMTI(return false);
269 }
270 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version) NOT_JVMTI_RETURN_(0);
271 static void decode_version_values(jint version, int * major, int * minor,
272 int * micro) NOT_JVMTI_RETURN;
273
274 // single stepping management methods
275 static void at_single_stepping_point(JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
276 static void expose_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN;
277 static bool hide_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN_(false);
278
279 // Methods that notify the debugger that something interesting has happened in the VM.
280 static void post_early_vm_start () NOT_JVMTI_RETURN;
281 static void post_vm_start () NOT_JVMTI_RETURN;
282 static void post_vm_initialized () NOT_JVMTI_RETURN;
283 static void post_vm_death () NOT_JVMTI_RETURN;
284
285 static void post_single_step (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
286 static void post_raw_breakpoint (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
287
288 static void post_exception_throw (JavaThread *thread, Method* method, address location, oop exception) NOT_JVMTI_RETURN;
289 static void notice_unwind_due_to_exception (JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) NOT_JVMTI_RETURN;
290
291 static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
292 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
293 NOT_JVMTI_RETURN_(NULL);
294 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
295 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
296 NOT_JVMTI_RETURN_(NULL);
297 static void post_field_access_by_jni (JavaThread *thread, oop obj,
298 Klass* klass, jfieldID fieldID, bool is_static) NOT_JVMTI_RETURN;
299 static void post_field_access (JavaThread *thread, Method* method,
300 address location, Klass* field_klass, Handle object, jfieldID field) NOT_JVMTI_RETURN;
301 static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
302 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
303 jvalue *value) NOT_JVMTI_RETURN_(NULL);
304 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
305 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
306 jvalue *value) NOT_JVMTI_RETURN_(NULL);
307 static void post_field_modification_by_jni(JavaThread *thread, oop obj,
308 Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
309 jvalue *value);
310 static void post_raw_field_modification(JavaThread *thread, Method* method,
311 address location, Klass* field_klass, Handle object, jfieldID field,
312 char sig_type, jvalue *value) NOT_JVMTI_RETURN;
313
314 static void post_method_entry (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
315 static void post_method_exit (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
316
317 static void post_class_load (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
318 static void post_class_unload (Klass* klass) NOT_JVMTI_RETURN;
319 static void post_class_prepare (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
320
321 static void post_thread_start (JavaThread *thread) NOT_JVMTI_RETURN;
322 static void post_thread_end (JavaThread *thread) NOT_JVMTI_RETURN;
323
324 // Support for java.lang.instrument agent loading.
325 static bool _should_post_class_file_load_hook;
326 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
327 inline static bool should_post_class_file_load_hook() {
328 JVMTI_ONLY(return _should_post_class_file_load_hook);
329 NOT_JVMTI(return false;)
330 }
331 static bool early_class_hook_env();
332 // Return true if the class was modified by the hook.
333 static bool post_class_file_load_hook(Symbol* h_name, Handle class_loader,
334 Handle h_protection_domain,
335 unsigned char **data_ptr, unsigned char **end_ptr,
336 JvmtiCachedClassFileData **cache_ptr) NOT_JVMTI_RETURN_(false);
337 static void post_native_method_bind(Method* method, address* function_ptr) NOT_JVMTI_RETURN;
338 static void post_compiled_method_load(nmethod *nm) NOT_JVMTI_RETURN;
339 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN;
340
341 // used to post a CompiledMethodUnload event
342 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) NOT_JVMTI_RETURN;
343
344 // similiar to post_dynamic_code_generated except that it can be used to
345 // post a DynamicCodeGenerated event while holding locks in the VM. Any event
346 // posted using this function is recorded by the enclosing event collector
347 // -- JvmtiDynamicCodeEventCollector.
348 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) NOT_JVMTI_RETURN;
349
350 static void post_garbage_collection_finish() NOT_JVMTI_RETURN;
351 static void post_garbage_collection_start() NOT_JVMTI_RETURN;
352 static void post_data_dump() NOT_JVMTI_RETURN;
353 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
354 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
355 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) NOT_JVMTI_RETURN;
356 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) NOT_JVMTI_RETURN;
357 static void post_object_free(JvmtiEnv* env, jlong tag) NOT_JVMTI_RETURN;
358 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) NOT_JVMTI_RETURN;
359 static void record_vm_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
360 // Post objects collected by vm_object_alloc_event_collector.
361 static void post_vm_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
362 // Collects vm internal objects for later event posting.
363 inline static void vm_object_alloc_event_collector(oop object) {
364 if (should_post_vm_object_alloc()) {
365 record_vm_internal_object_allocation(object);
366 }
367 }
368
369 static void record_sampled_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
370 // Post objects collected by sampled_object_alloc_event_collector.
371 static void post_sampled_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
372
373 // Collects vm internal objects for later event posting.
374 inline static void sampled_object_alloc_event_collector(oop object) {
375 if (should_post_sampled_object_alloc()) {
376 record_sampled_internal_object_allocation(object);
377 }
378 }
379
380 inline static void post_array_size_exhausted() {
381 if (should_post_resource_exhausted()) {
382 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
383 "Requested array size exceeds VM limit");
384 }
385 }
386
387 static void cleanup_thread (JavaThread* thread) NOT_JVMTI_RETURN;
388 static void clear_detected_exception (JavaThread* thread) NOT_JVMTI_RETURN;
389
390 static void oops_do(OopClosure* f) NOT_JVMTI_RETURN;
391 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) NOT_JVMTI_RETURN;
392 static void gc_epilogue() NOT_JVMTI_RETURN;
393
394 static void transition_pending_onload_raw_monitors() NOT_JVMTI_RETURN;
395
396 #if INCLUDE_SERVICES
397 // attach support
398 static jint load_agent_library(const char *agent, const char *absParam, const char *options, outputStream* out) NOT_JVMTI_RETURN_(JNI_ERR);
399 #endif
400
401 // SetNativeMethodPrefix support
402 static char** get_all_native_method_prefixes(int* count_ptr) NOT_JVMTI_RETURN_(NULL);
403
404 // JavaThread lifecycle support:
405 static jvmtiError cv_external_thread_to_JavaThread(ThreadsList * t_list,
406 jthread thread,
407 JavaThread ** jt_pp,
408 oop * thread_oop_p);
409 static jvmtiError cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
410 JavaThread ** jt_pp);
411 };
412
413 // Support class used by JvmtiDynamicCodeEventCollector and others. It
414 // describes a single code blob by name and address range.
415 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> {
416 private:
417 char _name[64];
418 address _code_begin;
419 address _code_end;
420
421 public:
422 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
423 assert(name != NULL, "all code blobs must be named");
424 strncpy(_name, name, sizeof(_name));
425 _name[sizeof(_name)-1] = '\0';
426 _code_begin = code_begin;
427 _code_end = code_end;
428 }
429 char* name() { return _name; }
430 address code_begin() { return _code_begin; }
431 address code_end() { return _code_end; }
432 };
433
434 // JvmtiEventCollector is a helper class to setup thread for
435 // event collection.
436 class JvmtiEventCollector : public StackObj {
437 private:
438 JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
439 bool _unset_jvmti_thread_state;
440
441 public:
442 JvmtiEventCollector() : _prev(NULL), _unset_jvmti_thread_state(false) {}
443
444 void setup_jvmti_thread_state(); // Set this collector in current thread, returns if success.
445 void unset_jvmti_thread_state(); // Reset previous collector in current thread.
446 virtual bool is_dynamic_code_event() { return false; }
447 virtual bool is_vm_object_alloc_event(){ return false; }
448 virtual bool is_sampled_object_alloc_event(){ return false; }
449 JvmtiEventCollector *get_prev() { return _prev; }
450 };
451
452 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
453 // interface. It collects "dynamic code generated" events that are posted
454 // while holding locks. When the event collector goes out of scope the
455 // events will be posted.
456 //
457 // Usage :-
458 //
459 // {
460 // JvmtiDynamicCodeEventCollector event_collector;
461 // :
462 // { MutexLocker ml(...)
463 // :
464 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
465 // }
466 // // event collector goes out of scope => post events to profiler.
467 // }
468
469 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
470 private:
471 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
472
473 friend class JvmtiExport;
474 void register_stub(const char* name, address start, address end);
475
476 public:
477 JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
478 ~JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
479 bool is_dynamic_code_event() { return true; }
480
481 };
482
483 // Used as a base class for object allocation collection and then posting
484 // the allocations to any event notification callbacks.
485 //
486 class JvmtiObjectAllocEventCollector : public JvmtiEventCollector {
487 protected:
488 GrowableArray<oop>* _allocated; // field to record collected allocated object oop.
489 bool _enable; // This flag is enabled in constructor if set up in the thread state
490 // and disabled in destructor before posting event. To avoid
491 // collection of objects allocated while running java code inside
492 // agent post_X_object_alloc() event handler.
493 void (*_post_callback)(JavaThread*, oop); // what callback to use when destroying the collector.
494
495 //GC support
496 void oops_do(OopClosure* f);
497
498 friend class JvmtiExport;
499
500 // Record allocated object oop.
501 inline void record_allocation(oop obj);
502
503 //GC support
504 static void oops_do_for_all_threads(OopClosure* f);
505
506 public:
507 JvmtiObjectAllocEventCollector() NOT_JVMTI_RETURN;
508
509 void generate_call_for_allocated();
510
511 bool is_enabled() { return _enable; }
512 void set_enabled(bool on) { _enable = on; }
513 };
514
515 // Used to record vm internally allocated object oops and post
516 // vm object alloc event for objects visible to java world.
517 // Constructor enables JvmtiThreadState flag and all vm allocated
518 // objects are recorded in a growable array. When destructor is
519 // called the vm object alloc event is posted for each object
520 // visible to java world.
521 // See jvm.cpp file for its usage.
522 //
523 class JvmtiVMObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
524 public:
525 JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
526 ~JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
527 virtual bool is_vm_object_alloc_event() { return true; }
528 };
529
530 // Used to record sampled allocated object oops and post
531 // sampled object alloc event.
532 // Constructor enables JvmtiThreadState flag and all sampled allocated
533 // objects are recorded in a growable array. When destructor is
534 // called the sampled object alloc event is posted for each sampled object.
535 // See jvm.cpp file for its usage.
536 //
537 class JvmtiSampledObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
538 public:
539 JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
540 ~JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
541 bool is_sampled_object_alloc_event() { return true; }
542 static bool object_alloc_is_safe_to_sample();
543 };
544
545 // Marker class to disable the posting of VMObjectAlloc events
546 // within its scope.
547 //
548 // Usage :-
549 //
550 // {
551 // NoJvmtiVMObjectAllocMark njm;
552 // :
553 // // VMObjAlloc event will not be posted
554 // JvmtiExport::vm_object_alloc_event_collector(obj);
555 // :
556 // }
557
558 class NoJvmtiVMObjectAllocMark : public StackObj {
559 private:
560 // enclosing collector if enabled, NULL otherwise
561 JvmtiVMObjectAllocEventCollector *_collector;
562
563 bool was_enabled() { return _collector != NULL; }
564
565 public:
566 NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
567 ~NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
568 };
569
570
571 // Base class for reporting GC events to JVMTI.
572 class JvmtiGCMarker : public StackObj {
573 public:
574 JvmtiGCMarker() NOT_JVMTI_RETURN;
575 ~JvmtiGCMarker() NOT_JVMTI_RETURN;
576 };
577
578 // JvmtiHideSingleStepping is a helper class for hiding
579 // internal single step events.
580 class JvmtiHideSingleStepping : public StackObj {
581 private:
582 bool _single_step_hidden;
583 JavaThread * _thread;
584
585 public:
586 JvmtiHideSingleStepping(JavaThread * thread) {
587 assert(thread != NULL, "sanity check");
588
589 _single_step_hidden = false;
590 _thread = thread;
591 if (JvmtiExport::should_post_single_step()) {
592 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
593 }
594 }
595
596 ~JvmtiHideSingleStepping() {
597 if (_single_step_hidden) {
598 JvmtiExport::expose_single_stepping(_thread);
599 }
600 }
601 };
602
603 #endif // SHARE_VM_PRIMS_JVMTIEXPORT_HPP