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 private:
164
165 // GenerateEvents support to allow posting of CompiledMethodLoad and
166 // DynamicCodeGenerated events for a given environment.
167 friend class JvmtiCodeBlobEvents;
168
169 static void post_compiled_method_load(JvmtiEnv* env, nmethod *nm) NOT_JVMTI_RETURN;
170 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
171 const void *code_end) NOT_JVMTI_RETURN;
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 uint64_t _redefinition_count;
178 friend class VM_RedefineClasses;
179 inline static void increment_redefinition_count() {
180 JVMTI_ONLY(_redefinition_count++;)
181 }
182 // Flag to indicate if the compiler has recorded all dependencies. When the
183 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler
184 // records all dependencies from startup. However if the capability is first
185 // enabled some time later then the dependencies recorded by the compiler
186 // are incomplete. This flag is used by RedefineClasses to know if the
187 // dependency information is complete or not.
188 static bool _all_dependencies_are_recorded;
189
190 public:
191 inline static bool has_redefined_a_class() {
192 JVMTI_ONLY(return _redefinition_count != 0);
193 NOT_JVMTI(return false);
194 }
195
196 // Only set in safepoint, so no memory ordering needed.
197 inline static uint64_t redefinition_count() {
198 JVMTI_ONLY(return _redefinition_count);
199 NOT_JVMTI(return 0);
200 }
201
202 inline static bool all_dependencies_are_recorded() {
203 return _all_dependencies_are_recorded;
204 }
205
206 inline static void set_all_dependencies_are_recorded(bool on) {
207 _all_dependencies_are_recorded = (on != 0);
208 }
209
210 // Add read edges to the unnamed modules of the bootstrap and app class loaders
211 static void add_default_read_edges(Handle h_module, TRAPS) NOT_JVMTI_RETURN;
212
213 // Add a read edge to the module
214 static jvmtiError add_module_reads(Handle module, Handle to_module, TRAPS);
215
216 // Updates a module to export a package
217 static jvmtiError add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS);
218
219 // Updates a module to open a package
220 static jvmtiError add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS);
221
222 // Add a used service to the module
223 static jvmtiError add_module_uses(Handle module, Handle service, TRAPS);
224
225 // Add a service provider to the module
226 static jvmtiError add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS);
227
228 // let JVMTI know that the JVM_OnLoad code is running
229 static void enter_onload_phase() NOT_JVMTI_RETURN;
230
231 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
232 static void enter_primordial_phase() NOT_JVMTI_RETURN;
233
234 // let JVMTI know that the VM isn't up yet but JNI is live
235 static void enter_early_start_phase() NOT_JVMTI_RETURN;
236 static void enter_start_phase() NOT_JVMTI_RETURN;
237
238 // let JVMTI know that the VM is fully up and running now
239 static void enter_live_phase() NOT_JVMTI_RETURN;
240
241 // ------ can_* conditions (below) are set at OnLoad and never changed ------------
242 inline static bool can_modify_any_class() {
243 JVMTI_ONLY(return _can_modify_any_class);
244 NOT_JVMTI(return false);
245 }
246 inline static bool can_access_local_variables() {
247 JVMTI_ONLY(return _can_access_local_variables);
248 NOT_JVMTI(return false);
249 }
250 inline static bool can_hotswap_or_post_breakpoint() {
251 JVMTI_ONLY(return _can_hotswap_or_post_breakpoint);
252 NOT_JVMTI(return false);
253 }
254 inline static bool can_walk_any_space() {
255 JVMTI_ONLY(return _can_walk_any_space);
256 NOT_JVMTI(return false);
257 }
258
259 // field access management
260 static address get_field_access_count_addr() NOT_JVMTI_RETURN_(0);
261
262 // field modification management
263 static address get_field_modification_count_addr() NOT_JVMTI_RETURN_(0);
264
265 // -----------------
266
267 static bool is_jvmti_version(jint version) {
268 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE);
269 NOT_JVMTI(return false);
270 }
271 static bool is_jvmdi_version(jint version) {
272 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE);
273 NOT_JVMTI(return false);
274 }
275 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version) NOT_JVMTI_RETURN_(0);
276 static void decode_version_values(jint version, int * major, int * minor,
277 int * micro) NOT_JVMTI_RETURN;
278
279 // single stepping management methods
280 static void at_single_stepping_point(JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
281 static void expose_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN;
282 static bool hide_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN_(false);
283
284 // Methods that notify the debugger that something interesting has happened in the VM.
285 static void post_early_vm_start () NOT_JVMTI_RETURN;
286 static void post_vm_start () NOT_JVMTI_RETURN;
287 static void post_vm_initialized () NOT_JVMTI_RETURN;
288 static void post_vm_death () NOT_JVMTI_RETURN;
289
290 static void post_single_step (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
291 static void post_raw_breakpoint (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN;
292
293 static void post_exception_throw (JavaThread *thread, Method* method, address location, oop exception) NOT_JVMTI_RETURN;
294 static void notice_unwind_due_to_exception (JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) NOT_JVMTI_RETURN;
295
296 static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
297 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
298 NOT_JVMTI_RETURN_(NULL);
299 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
300 oop obj, Klass* klass, jfieldID fieldID, bool is_static)
301 NOT_JVMTI_RETURN_(NULL);
302 static void post_field_access_by_jni (JavaThread *thread, oop obj,
303 Klass* klass, jfieldID fieldID, bool is_static) NOT_JVMTI_RETURN;
304 static void post_field_access (JavaThread *thread, Method* method,
305 address location, Klass* field_klass, Handle object, jfieldID field) NOT_JVMTI_RETURN;
306 static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
307 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
308 jvalue *value) NOT_JVMTI_RETURN_(NULL);
309 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
310 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
311 jvalue *value) NOT_JVMTI_RETURN_(NULL);
312 static void post_field_modification_by_jni(JavaThread *thread, oop obj,
313 Klass* klass, jfieldID fieldID, bool is_static, char sig_type,
314 jvalue *value);
315 static void post_raw_field_modification(JavaThread *thread, Method* method,
316 address location, Klass* field_klass, Handle object, jfieldID field,
317 char sig_type, jvalue *value) NOT_JVMTI_RETURN;
318
319 static void post_method_entry (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
320 static void post_method_exit (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN;
321
322 static void post_class_load (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
323 static void post_class_unload (Klass* klass) NOT_JVMTI_RETURN;
324 static void post_class_prepare (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN;
325
326 static void post_thread_start (JavaThread *thread) NOT_JVMTI_RETURN;
327 static void post_thread_end (JavaThread *thread) NOT_JVMTI_RETURN;
328
329 // Support for java.lang.instrument agent loading.
330 static bool _should_post_class_file_load_hook;
331 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
332 inline static bool should_post_class_file_load_hook() {
333 JVMTI_ONLY(return _should_post_class_file_load_hook);
334 NOT_JVMTI(return false;)
335 }
336 static bool is_early_phase() NOT_JVMTI_RETURN_(false);
337 static bool has_early_class_hook_env() NOT_JVMTI_RETURN_(false);
338 // Return true if the class was modified by the hook.
339 static bool post_class_file_load_hook(Symbol* h_name, Handle class_loader,
340 Handle h_protection_domain,
341 unsigned char **data_ptr, unsigned char **end_ptr,
342 JvmtiCachedClassFileData **cache_ptr) NOT_JVMTI_RETURN_(false);
343 static void post_native_method_bind(Method* method, address* function_ptr) NOT_JVMTI_RETURN;
344 static void post_compiled_method_load(nmethod *nm) NOT_JVMTI_RETURN;
345 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN;
346
347 // used to post a CompiledMethodUnload event
348 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) NOT_JVMTI_RETURN;
349
350 // similiar to post_dynamic_code_generated except that it can be used to
351 // post a DynamicCodeGenerated event while holding locks in the VM. Any event
352 // posted using this function is recorded by the enclosing event collector
353 // -- JvmtiDynamicCodeEventCollector.
354 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) NOT_JVMTI_RETURN;
355
356 static void post_garbage_collection_finish() NOT_JVMTI_RETURN;
357 static void post_garbage_collection_start() NOT_JVMTI_RETURN;
358 static void post_data_dump() NOT_JVMTI_RETURN;
359 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
360 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN;
361 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) NOT_JVMTI_RETURN;
362 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) NOT_JVMTI_RETURN;
363 static void post_object_free(JvmtiEnv* env, jlong tag) NOT_JVMTI_RETURN;
364 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) NOT_JVMTI_RETURN;
365 static void record_vm_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
366 // Post objects collected by vm_object_alloc_event_collector.
367 static void post_vm_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
368 // Collects vm internal objects for later event posting.
369 inline static void vm_object_alloc_event_collector(oop object) {
370 if (should_post_vm_object_alloc()) {
371 record_vm_internal_object_allocation(object);
372 }
373 }
374
375 static void record_sampled_internal_object_allocation(oop object) NOT_JVMTI_RETURN;
376 // Post objects collected by sampled_object_alloc_event_collector.
377 static void post_sampled_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN;
378
379 // Collects vm internal objects for later event posting.
380 inline static void sampled_object_alloc_event_collector(oop object) {
381 if (should_post_sampled_object_alloc()) {
382 record_sampled_internal_object_allocation(object);
383 }
384 }
385
386 inline static void post_array_size_exhausted() {
387 if (should_post_resource_exhausted()) {
388 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
389 "Requested array size exceeds VM limit");
390 }
391 }
392
393 static void cleanup_thread (JavaThread* thread) NOT_JVMTI_RETURN;
394 static void clear_detected_exception (JavaThread* thread) NOT_JVMTI_RETURN;
395
396 static void oops_do(OopClosure* f) NOT_JVMTI_RETURN;
397 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) NOT_JVMTI_RETURN;
398
399 static void transition_pending_onload_raw_monitors() NOT_JVMTI_RETURN;
400
401 #if INCLUDE_SERVICES
402 // attach support
403 static jint load_agent_library(const char *agent, const char *absParam, const char *options, outputStream* out) NOT_JVMTI_RETURN_(JNI_ERR);
404 #endif
405
406 // SetNativeMethodPrefix support
407 static char** get_all_native_method_prefixes(int* count_ptr) NOT_JVMTI_RETURN_(NULL);
408
409 // JavaThread lifecycle support:
410 static jvmtiError cv_external_thread_to_JavaThread(ThreadsList * t_list,
411 jthread thread,
412 JavaThread ** jt_pp,
413 oop * thread_oop_p);
414 static jvmtiError cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
415 JavaThread ** jt_pp);
416 };
417
418 // Support class used by JvmtiDynamicCodeEventCollector and others. It
419 // describes a single code blob by name and address range.
420 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> {
421 private:
422 char _name[64];
423 address _code_begin;
424 address _code_end;
425
426 public:
427 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
428 assert(name != NULL, "all code blobs must be named");
429 strncpy(_name, name, sizeof(_name) - 1);
430 _name[sizeof(_name)-1] = '\0';
431 _code_begin = code_begin;
432 _code_end = code_end;
433 }
434 char* name() { return _name; }
435 address code_begin() { return _code_begin; }
436 address code_end() { return _code_end; }
437 };
438
439 // JvmtiEventCollector is a helper class to setup thread for
440 // event collection.
441 class JvmtiEventCollector : public StackObj {
442 private:
443 JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
444 bool _unset_jvmti_thread_state;
445
446 public:
447 JvmtiEventCollector() : _prev(NULL), _unset_jvmti_thread_state(false) {}
448
449 void setup_jvmti_thread_state(); // Set this collector in current thread, returns if success.
450 void unset_jvmti_thread_state(); // Reset previous collector in current thread.
451 virtual bool is_dynamic_code_event() { return false; }
452 virtual bool is_vm_object_alloc_event(){ return false; }
453 virtual bool is_sampled_object_alloc_event(){ return false; }
454 JvmtiEventCollector *get_prev() { return _prev; }
455 };
456
457 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
458 // interface. It collects "dynamic code generated" events that are posted
459 // while holding locks. When the event collector goes out of scope the
460 // events will be posted.
461 //
462 // Usage :-
463 //
464 // {
465 // JvmtiDynamicCodeEventCollector event_collector;
466 // :
467 // { MutexLocker ml(...)
468 // :
469 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
470 // }
471 // // event collector goes out of scope => post events to profiler.
472 // }
473
474 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
475 private:
476 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
477
478 friend class JvmtiExport;
479 void register_stub(const char* name, address start, address end);
480
481 public:
482 JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
483 ~JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN;
484 bool is_dynamic_code_event() { return true; }
485
486 };
487
488 // Used as a base class for object allocation collection and then posting
489 // the allocations to any event notification callbacks.
490 //
491 class JvmtiObjectAllocEventCollector : public JvmtiEventCollector {
492 protected:
493 GrowableArray<oop>* _allocated; // field to record collected allocated object oop.
494 bool _enable; // This flag is enabled in constructor if set up in the thread state
495 // and disabled in destructor before posting event. To avoid
496 // collection of objects allocated while running java code inside
497 // agent post_X_object_alloc() event handler.
498 void (*_post_callback)(JavaThread*, oop); // what callback to use when destroying the collector.
499
500 //GC support
501 void oops_do(OopClosure* f);
502
503 friend class JvmtiExport;
504
505 // Record allocated object oop.
506 inline void record_allocation(oop obj);
507
508 //GC support
509 static void oops_do_for_all_threads(OopClosure* f);
510
511 public:
512 JvmtiObjectAllocEventCollector() NOT_JVMTI_RETURN;
513
514 void generate_call_for_allocated();
515
516 bool is_enabled() { return _enable; }
517 void set_enabled(bool on) { _enable = on; }
518 };
519
520 // Used to record vm internally allocated object oops and post
521 // vm object alloc event for objects visible to java world.
522 // Constructor enables JvmtiThreadState flag and all vm allocated
523 // objects are recorded in a growable array. When destructor is
524 // called the vm object alloc event is posted for each object
525 // visible to java world.
526 // See jvm.cpp file for its usage.
527 //
528 class JvmtiVMObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
529 public:
530 JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
531 ~JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN;
532 virtual bool is_vm_object_alloc_event() { return true; }
533 };
534
535 // Used to record sampled allocated object oops and post
536 // sampled object alloc event.
537 // Constructor enables JvmtiThreadState flag and all sampled allocated
538 // objects are recorded in a growable array. When destructor is
539 // called the sampled object alloc event is posted for each sampled object.
540 // See jvm.cpp file for its usage.
541 //
542 class JvmtiSampledObjectAllocEventCollector : public JvmtiObjectAllocEventCollector {
543 public:
544 JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
545 ~JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN;
546 bool is_sampled_object_alloc_event() { return true; }
547 static bool object_alloc_is_safe_to_sample() NOT_JVMTI_RETURN_(false);
548 };
549
550 // Marker class to disable the posting of VMObjectAlloc events
551 // within its scope.
552 //
553 // Usage :-
554 //
555 // {
556 // NoJvmtiVMObjectAllocMark njm;
557 // :
558 // // VMObjAlloc event will not be posted
559 // JvmtiExport::vm_object_alloc_event_collector(obj);
560 // :
561 // }
562
563 class NoJvmtiVMObjectAllocMark : public StackObj {
564 private:
565 // enclosing collector if enabled, NULL otherwise
566 JvmtiVMObjectAllocEventCollector *_collector;
567
568 bool was_enabled() { return _collector != NULL; }
569
570 public:
571 NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
572 ~NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN;
573 };
574
575
576 // Base class for reporting GC events to JVMTI.
577 class JvmtiGCMarker : public StackObj {
578 public:
579 JvmtiGCMarker() NOT_JVMTI_RETURN;
580 ~JvmtiGCMarker() NOT_JVMTI_RETURN;
581 };
582
583 // JvmtiHideSingleStepping is a helper class for hiding
584 // internal single step events.
585 class JvmtiHideSingleStepping : public StackObj {
586 private:
587 bool _single_step_hidden;
588 JavaThread * _thread;
589
590 public:
591 JvmtiHideSingleStepping(JavaThread * thread) {
592 assert(thread != NULL, "sanity check");
593
594 _single_step_hidden = false;
595 _thread = thread;
596 if (JvmtiExport::should_post_single_step()) {
597 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
598 }
599 }
600
601 ~JvmtiHideSingleStepping() {
602 if (_single_step_hidden) {
603 JvmtiExport::expose_single_stepping(_thread);
604 }
605 }
606 };
607
608 #endif // SHARE_PRIMS_JVMTIEXPORT_HPP