1 /*
2 * Copyright (c) 1998, 2019, 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_PRIMS_JVMTIEXPORT_HPP
26 #define SHARE_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 JVMTI_SUPPORT_FLAG(can_get_owned_monitor_info) // includes can_get_owned_monitor_stack_depth_info
95
96 friend class JvmtiEventControllerPrivate; // should only modify these flags
97 JVMTI_SUPPORT_FLAG(should_post_single_step)
98 JVMTI_SUPPORT_FLAG(should_post_field_access)
99 JVMTI_SUPPORT_FLAG(should_post_field_modification)
100 JVMTI_SUPPORT_FLAG(should_post_class_load)
101 JVMTI_SUPPORT_FLAG(should_post_class_prepare)
102 JVMTI_SUPPORT_FLAG(should_post_class_unload)
103 JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
104 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
105 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
106 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
107 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
108 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
109 JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
110 JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
111 JVMTI_SUPPORT_FLAG(should_post_data_dump)
112 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
113 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
114 JVMTI_SUPPORT_FLAG(should_post_on_exceptions)
115
116 // ------ the below maybe don't have to be (but are for now)
117 // fixed conditions here ------------
118 // any events can be enabled
119 JVMTI_SUPPORT_FLAG(should_post_thread_life)
120 JVMTI_SUPPORT_FLAG(should_post_object_free)
121 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
122
123 // we are holding objects on the heap - need to talk to GC - e.g.
124 // breakpoint info
125 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
126 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
127 JVMTI_SUPPORT_FLAG(should_post_sampled_object_alloc)
128
129 // If flag cannot be implemented, give an error if on=true
130 static void report_unsupported(bool on);
131
132 // these should only be called by the friend class
133 friend class JvmtiManageCapabilities;
134 inline static void set_can_modify_any_class(bool on) {
135 JVMTI_ONLY(_can_modify_any_class = (on != 0);)
136 }
137 inline static void set_can_access_local_variables(bool on) {
138 JVMTI_ONLY(_can_access_local_variables = (on != 0);)
139 }
140 inline static void set_can_hotswap_or_post_breakpoint(bool on) {
141 JVMTI_ONLY(_can_hotswap_or_post_breakpoint = (on != 0);)
142 }
143 inline static void set_can_walk_any_space(bool on) {
144 JVMTI_ONLY(_can_walk_any_space = (on != 0);)
145 }
146
147 enum {
148 JVMTI_VERSION_MASK = 0x70000000,
149 JVMTI_VERSION_VALUE = 0x30000000,
150 JVMDI_VERSION_VALUE = 0x20000000
151 };
152
153 static void post_field_modification(JavaThread *thread, Method* method, address location,
154 Klass* field_klass, Handle object, jfieldID field,
155 char sig_type, jvalue *value);
156
157
158 // posts a DynamicCodeGenerated event (internal/private implementation).
159 // The public post_dynamic_code_generated* functions make use of the
160 // internal implementation. Also called from JvmtiDeferredEvent::post()
161 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN;
162
163 static void post_class_unload_internal(const char *name) NOT_JVMTI_RETURN;
164 private:
165
166 // GenerateEvents support to allow posting of CompiledMethodLoad and
167 // DynamicCodeGenerated events for a given environment.
168 friend class JvmtiCodeBlobEvents;
169
170 static void post_compiled_method_load(JvmtiEnv* env, nmethod *nm) 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 uint64_t _redefinition_count;
179 friend class VM_RedefineClasses;
180 inline static void increment_redefinition_count() {
181 JVMTI_ONLY(_redefinition_count++;)
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 _redefinition_count != 0);
194 NOT_JVMTI(return false);
195 }
196
197 // Only set in safepoint, so no memory ordering needed.
198 inline static uint64_t redefinition_count() {
199 JVMTI_ONLY(return _redefinition_count);
200 NOT_JVMTI(return 0);
201 }
202
203 inline static bool all_dependencies_are_recorded() {
204 return _all_dependencies_are_recorded;
205 }
206
207 inline static void set_all_dependencies_are_recorded(bool on) {
208 _all_dependencies_are_recorded = (on != 0);
209 }
210
211 // Add read edges to the unnamed modules of the bootstrap and app class loaders
212 static void add_default_read_edges(Handle h_module, TRAPS) NOT_JVMTI_RETURN;
213
214 // Add a read edge to the module
215 static jvmtiError add_module_reads(Handle module, Handle to_module, TRAPS);
216
217 // Updates a module to export a package
218 static jvmtiError add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS);
219
220 // Updates a module to open a package
221 static jvmtiError add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS);
222
223 // Add a used service to the module
224 static jvmtiError add_module_uses(Handle module, Handle service, TRAPS);
225
226 // Add a service provider to the module
227 static jvmtiError add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS);
228
229 // let JVMTI know that the JVM_OnLoad code is running
230 static void enter_onload_phase() NOT_JVMTI_RETURN;
231
232 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
233 static void enter_primordial_phase() NOT_JVMTI_RETURN;
234
235 // let JVMTI know that the VM isn't up yet but JNI is live
236 static void enter_early_start_phase() NOT_JVMTI_RETURN;
237 static void enter_start_phase() NOT_JVMTI_RETURN;
238
239 // let JVMTI know that the VM is fully up and running now
240 static void enter_live_phase() NOT_JVMTI_RETURN;
241
242 // ------ can_* conditions (below) are set at OnLoad and never changed ------------
243 inline static bool can_modify_any_class() {
244 JVMTI_ONLY(return _can_modify_any_class);
245 NOT_JVMTI(return false);
246 }
247 inline static bool can_access_local_variables() {
248 JVMTI_ONLY(return _can_access_local_variables);
249 NOT_JVMTI(return false);
250 }
251 inline static bool can_hotswap_or_post_breakpoint() {
252 JVMTI_ONLY(return _can_hotswap_or_post_breakpoint);
253 NOT_JVMTI(return false);
254 }
255 inline static bool can_walk_any_space() {
256 JVMTI_ONLY(return _can_walk_any_space);
257 NOT_JVMTI(return false);
258 }
259
260 // field access management
261 static address get_field_access_count_addr() NOT_JVMTI_RETURN_(0);
262
263 // field modification management
264 static address get_field_modification_count_addr() NOT_JVMTI_RETURN_(0);
265
266 // -----------------
267
268 static bool is_jvmti_version(jint version) {
269 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE);
270 NOT_JVMTI(return false);
271 }
272 static bool is_jvmdi_version(jint version) {
273 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE);
274 NOT_JVMTI(return false);
275 }
276 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version) NOT_JVMTI_RETURN_(0);
277 static void decode_version_values(jint version, int * major, int * minor,
278 int * micro) NOT_JVMTI_RETURN;
279
280 // single stepping management methods
281 static void at_single_stepping_point(JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
282 static void expose_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN;
283 static bool hide_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN_(false);
284
285 // Methods that notify the debugger that something interesting has happened in the VM.
286 static void post_early_vm_start () NOT_JVMTI_RETURN;
287 static void post_vm_start () NOT_JVMTI_RETURN;
288 static void post_vm_initialized () NOT_JVMTI_RETURN;
289 static void post_vm_death () NOT_JVMTI_RETURN;
290
291 static void post_single_step (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
292 static void post_raw_breakpoint (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
293
294 static void post_exception_throw (JavaThread *thread, Method* method, address location, oop exception) NOT_JVMTI_RETURN;
295 static void notice_unwind_due_to_exception (JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) NOT_JVMTI_RETURN;
296
297 static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
298 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
299 NOT_JVMTI_RETURN_(NULL);
300 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
301 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
302 NOT_JVMTI_RETURN_(NULL);
303 static void post_field_access_by_jni (JavaThread *thread, oop obj,
304 Klass* klass, jfieldID fieldID, bool is_static) NOT_JVMTI_RETURN;
305 static void post_field_access (JavaThread *thread, Method* method,
306 address location, Klass* field_klass, Handle object, jfieldID field) NOT_JVMTI_RETURN;
307 static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
308 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
309 jvalue *value) NOT_JVMTI_RETURN_(NULL);
310 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
311 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
312 jvalue *value) NOT_JVMTI_RETURN_(NULL);
313 static void post_field_modification_by_jni(JavaThread *thread, oop obj,
314 Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
315 jvalue *value);
316 static void post_raw_field_modification(JavaThread *thread, Method* method,
317 address location, Klass* field_klass, Handle object, jfieldID field,
318 char sig_type, jvalue *value) NOT_JVMTI_RETURN;
319
320 static void post_method_entry (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
321 static void post_method_exit (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
322
323 static void post_class_load (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
324 static void post_class_unload (Klass* klass) NOT_JVMTI_RETURN;
325 static void post_class_prepare (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
326
327 static void post_thread_start (JavaThread *thread) NOT_JVMTI_RETURN;
328 static void post_thread_end (JavaThread *thread) NOT_JVMTI_RETURN;
329
330 // Support for java.lang.instrument agent loading.
331 static bool _should_post_class_file_load_hook;
332 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
333 inline static bool should_post_class_file_load_hook() {
334 JVMTI_ONLY(return _should_post_class_file_load_hook);
335 NOT_JVMTI(return false;)
336 }
337 static bool is_early_phase() NOT_JVMTI_RETURN_(false);
338 static bool has_early_class_hook_env() NOT_JVMTI_RETURN_(false);
339 // Return true if the class was modified by the hook.
340 static bool post_class_file_load_hook(Symbol* h_name, Handle class_loader,
341 Handle h_protection_domain,
342 unsigned char **data_ptr, unsigned char **end_ptr,
343 JvmtiCachedClassFileData **cache_ptr) NOT_JVMTI_RETURN_(false);
344 static void post_native_method_bind(Method* method, address* function_ptr) NOT_JVMTI_RETURN;
345 static void post_compiled_method_load(nmethod *nm) NOT_JVMTI_RETURN;
346 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN;
347
348 // used to post a CompiledMethodUnload event
349 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) NOT_JVMTI_RETURN;
350
351 // similiar to post_dynamic_code_generated except that it can be used to
352 // post a DynamicCodeGenerated event while holding locks in the VM. Any event
353 // posted using this function is recorded by the enclosing event collector
354 // -- JvmtiDynamicCodeEventCollector.
355 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) NOT_JVMTI_RETURN;
356
357 static void post_garbage_collection_finish() NOT_JVMTI_RETURN;
358 static void post_garbage_collection_start() NOT_JVMTI_RETURN;
359 static void post_data_dump() NOT_JVMTI_RETURN;
360 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
361 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
362 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) NOT_JVMTI_RETURN;
363 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) NOT_JVMTI_RETURN;
364 static void post_object_free(JvmtiEnv* env, jlong tag) NOT_JVMTI_RETURN;
365 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) NOT_JVMTI_RETURN;
366 static void record_vm_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
367 // Post objects collected by vm_object_alloc_event_collector.
368 static void post_vm_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
369 // Collects vm internal objects for later event posting.
370 inline static void vm_object_alloc_event_collector(oop object) {
371 if (should_post_vm_object_alloc()) {
372 record_vm_internal_object_allocation(object);
373 }
374 }
375
376 static void record_sampled_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
377 // Post objects collected by sampled_object_alloc_event_collector.
378 static void post_sampled_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
379
380 // Collects vm internal objects for later event posting.
381 inline static void sampled_object_alloc_event_collector(oop object) {
382 if (should_post_sampled_object_alloc()) {
383 record_sampled_internal_object_allocation(object);
384 }
385 }
386
387 inline static void post_array_size_exhausted() {
388 if (should_post_resource_exhausted()) {
389 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
390 "Requested array size exceeds VM limit");
391 }
392 }
393
394 static void cleanup_thread (JavaThread* thread) NOT_JVMTI_RETURN;
395 static void clear_detected_exception (JavaThread* thread) NOT_JVMTI_RETURN;
396
397 static void oops_do(OopClosure* f) NOT_JVMTI_RETURN;
398 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) NOT_JVMTI_RETURN;
399
400 static void transition_pending_onload_raw_monitors() NOT_JVMTI_RETURN;
401
402 #if INCLUDE_SERVICES
403 // attach support
404 static jint load_agent_library(const char *agent, const char *absParam, const char *options, outputStream* out) NOT_JVMTI_RETURN_(JNI_ERR);
405 #endif
406
407 // SetNativeMethodPrefix support
408 static char** get_all_native_method_prefixes(int* count_ptr) NOT_JVMTI_RETURN_(NULL);
409
410 // JavaThread lifecycle support:
411 static jvmtiError cv_external_thread_to_JavaThread(ThreadsList * t_list,
412 jthread thread,
413 JavaThread ** jt_pp,
414 oop * thread_oop_p);
415 static jvmtiError cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
416 JavaThread ** jt_pp);
417 };
418
419 // Support class used by JvmtiDynamicCodeEventCollector and others. It
420 // describes a single code blob by name and address range.
421 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> {
422 private:
423 char _name[64];
424 address _code_begin;
425 address _code_end;
426
427 public:
428 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
429 assert(name != NULL, "all code blobs must be named");
430 strncpy(_name, name, sizeof(_name) - 1);
431 _name[sizeof(_name)-1] = '\0';
432 _code_begin = code_begin;
433 _code_end = code_end;
434 }
435 char* name() { return _name; }
436 address code_begin() { return _code_begin; }
437 address code_end() { return _code_end; }
438 };
439
440 // JvmtiEventCollector is a helper class to setup thread for
441 // event collection.
442 class JvmtiEventCollector : public StackObj {
443 private:
444 JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
445 bool _unset_jvmti_thread_state;
446
447 public:
448 JvmtiEventCollector() : _prev(NULL), _unset_jvmti_thread_state(false) {}
449
450 void setup_jvmti_thread_state(); // Set this collector in current thread, returns if success.
451 void unset_jvmti_thread_state(); // Reset previous collector in current thread.
452 virtual bool is_dynamic_code_event() { return false; }
453 virtual bool is_vm_object_alloc_event(){ return false; }
454 virtual bool is_sampled_object_alloc_event(){ return false; }
455 JvmtiEventCollector *get_prev() { return _prev; }
456 };
457
458 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
459 // interface. It collects "dynamic code generated" events that are posted
460 // while holding locks. When the event collector goes out of scope the
461 // events will be posted.
462 //
463 // Usage :-
464 //
465 // {
466 // JvmtiDynamicCodeEventCollector event_collector;
467 // :
468 // { MutexLocker ml(...)
469 // :
470 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
471 // }
472 // // event collector goes out of scope => post events to profiler.
473 // }
474
475 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
476 private:
477 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
478
479 friend class JvmtiExport;
480 void register_stub(const char* name, address start, address end);
481
482 public:
483 JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
484 ~JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
485 bool is_dynamic_code_event() { return true; }
486
487 };
488
489 // Used as a base class for object allocation collection and then posting
490 // the allocations to any event notification callbacks.
491 //
492 class JvmtiObjectAllocEventCollector : public JvmtiEventCollector {
493 protected:
494 GrowableArray<oop>* _allocated; // field to record collected allocated object oop.
495 bool _enable; // This flag is enabled in constructor if set up in the thread state
496 // and disabled in destructor before posting event. To avoid
497 // collection of objects allocated while running java code inside
498 // agent post_X_object_alloc() event handler.
499 void (*_post_callback)(JavaThread*, oop); // what callback to use when destroying the collector.
500
501 //GC support
502 void oops_do(OopClosure* f);
503
504 friend class JvmtiExport;
505
506 // Record allocated object oop.
507 inline void record_allocation(oop obj);
508
509 //GC support
510 static void oops_do_for_all_threads(OopClosure* f);
511
512 public:
513 JvmtiObjectAllocEventCollector() NOT_JVMTI_RETURN;
514
515 void generate_call_for_allocated();
516
517 bool is_enabled() { return _enable; }
518 void set_enabled(bool on) { _enable = on; }
519 };
520
521 // Used to record vm internally allocated object oops and post
522 // vm object alloc event for objects visible to java world.
523 // Constructor enables JvmtiThreadState flag and all vm allocated
524 // objects are recorded in a growable array. When destructor is
525 // called the vm object alloc event is posted for each object
526 // visible to java world.
527 // See jvm.cpp file for its usage.
528 //
529 class JvmtiVMObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
530 public:
531 JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
532 ~JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
533 virtual bool is_vm_object_alloc_event() { return true; }
534 };
535
536 // Used to record sampled allocated object oops and post
537 // sampled object alloc event.
538 // Constructor enables JvmtiThreadState flag and all sampled allocated
539 // objects are recorded in a growable array. When destructor is
540 // called the sampled object alloc event is posted for each sampled object.
541 // See jvm.cpp file for its usage.
542 //
543 class JvmtiSampledObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
544 public:
545 JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
546 ~JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
547 bool is_sampled_object_alloc_event() { return true; }
548 static bool object_alloc_is_safe_to_sample() NOT_JVMTI_RETURN_(false);
549 };
550
551 // Marker class to disable the posting of VMObjectAlloc events
552 // within its scope.
553 //
554 // Usage :-
555 //
556 // {
557 // NoJvmtiVMObjectAllocMark njm;
558 // :
559 // // VMObjAlloc event will not be posted
560 // JvmtiExport::vm_object_alloc_event_collector(obj);
561 // :
562 // }
563
564 class NoJvmtiVMObjectAllocMark : public StackObj {
565 private:
566 // enclosing collector if enabled, NULL otherwise
567 JvmtiVMObjectAllocEventCollector *_collector;
568
569 bool was_enabled() { return _collector != NULL; }
570
571 public:
572 NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
573 ~NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
574 };
575
576
577 // Base class for reporting GC events to JVMTI.
578 class JvmtiGCMarker : public StackObj {
579 public:
580 JvmtiGCMarker() NOT_JVMTI_RETURN;
581 ~JvmtiGCMarker() NOT_JVMTI_RETURN;
582 };
583
584 // JvmtiHideSingleStepping is a helper class for hiding
585 // internal single step events.
586 class JvmtiHideSingleStepping : public StackObj {
587 private:
588 bool _single_step_hidden;
589 JavaThread * _thread;
590
591 public:
592 JvmtiHideSingleStepping(JavaThread * thread) {
593 assert(thread != NULL, "sanity check");
594
595 _single_step_hidden = false;
596 _thread = thread;
597 if (JvmtiExport::should_post_single_step()) {
598 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
599 }
600 }
601
602 ~JvmtiHideSingleStepping() {
603 if (_single_step_hidden) {
604 JvmtiExport::expose_single_stepping(_thread);
605 }
606 }
607 };
608
609 #endif // SHARE_PRIMS_JVMTIEXPORT_HPP