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