76 private:
77 friend class JvmtiEnv;
78 JavaThread *_thread;
79 bool _hide_single_stepping;
80 bool _pending_step_for_popframe;
81 bool _pending_step_for_earlyret;
82 int _hide_level;
83
84 public:
85 enum ExceptionState {
86 ES_CLEARED,
87 ES_DETECTED,
88 ES_CAUGHT
89 };
90
91 private:
92 ExceptionState _exception_state;
93
94 // Used to send class being redefined/retransformed and kind of transform
95 // info to the class file load hook event handler.
96 KlassHandle *_class_being_redefined;
97 JvmtiClassLoadKind _class_load_kind;
98
99 // This is only valid when is_interp_only_mode() returns true
100 int _cur_stack_depth;
101
102 JvmtiThreadEventEnable _thread_event_enable;
103
104 // for support of JvmtiEnvThreadState
105 JvmtiEnvThreadState* _head_env_thread_state;
106
107 // doubly-linked linear list of active thread state
108 // needed in order to iterate the list without holding Threads_lock
109 static JvmtiThreadState *_head;
110 JvmtiThreadState *_next;
111 JvmtiThreadState *_prev;
112
113 // holds the current dynamic code event collector, NULL if no event collector in use
114 JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
115 // holds the current vm object alloc event collector, NULL if no event collector in use
116 JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;
203 // Step pending flag is set when PopFrame is called and it is cleared
204 // when step for the Pop Frame is completed.
205 // This logic is used to distinguish b/w step for pop frame and repeat step.
206 void set_pending_step_for_popframe() { _pending_step_for_popframe = true; }
207 void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
208 bool is_pending_step_for_popframe() { return _pending_step_for_popframe; }
209 void process_pending_step_for_popframe();
210
211 // Step pending flag is set when ForceEarlyReturn is called and it is cleared
212 // when step for the ForceEarlyReturn is completed.
213 // This logic is used to distinguish b/w step for early return and repeat step.
214 void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; }
215 void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
216 bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; }
217 void process_pending_step_for_earlyret();
218
219 // Setter and getter method is used to send redefined class info
220 // when class file load hook event is posted.
221 // It is set while loading redefined class and cleared before the
222 // class file load hook event is posted.
223 inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) {
224 _class_being_redefined = h_class;
225 _class_load_kind = kind;
226 }
227
228 inline void clear_class_being_redefined() {
229 _class_being_redefined = NULL;
230 _class_load_kind = jvmti_class_load_kind_load;
231 }
232
233 inline KlassHandle *get_class_being_redefined() {
234 return _class_being_redefined;
235 }
236
237 inline JvmtiClassLoadKind get_class_load_kind() {
238 return _class_load_kind;
239 }
240
241 // RedefineClasses support
242 // The bug 6214132 caused the verification to fail.
243 //
244 // Below is the detailed description of the fix approach taken:
245 // 1. What's done in RedefineClasses() before verification:
246 // a) A reference to the class being redefined (_the_class) and a
247 // reference to new version of the class (_scratch_class) are
248 // saved here for use during the bytecode verification phase of
249 // RedefineClasses. See RedefineVerifyMark for how these fields
250 // are managed.
251 // b) The _java_mirror field from _the_class is copied to the
252 // _java_mirror field in _scratch_class. This means that a jclass
253 // returned for _the_class or _scratch_class will refer to the
254 // same Java mirror. The verifier will see the "one true mirror"
255 // for the class being verified.
256 // 2. What is done at verification:
257 // When the verifier makes calls into the VM to ask questions about
258 // the class being verified, it will pass the jclass to JVM_* functions.
259 // The jclass is always pointing to the mirror of _the_class.
260 // ~28 JVM_* functions called by the verifier for the information
261 // about CP entries and klass structure should check the jvmtiThreadState
262 // info about equivalent klass versions and use it to replace a Klass*
263 // of _the_class with a Klass* of _scratch_class. The function
264 // class_to_verify_considering_redefinition() must be called for it.
265 //
266 // Note again, that this redirection happens only for the verifier thread.
267 // Other threads have very small overhead by checking the existence
268 // of the jvmtiThreadSate and the information about klasses equivalence.
269 // No JNI functions need to be changed, they don't reference the klass guts.
270 // The JavaThread pointer is already available in all JVM_* functions
271 // used by the verifier, so there is no extra performance issue with it.
272
273 private:
274 KlassHandle *_the_class_for_redefinition_verification;
275 KlassHandle *_scratch_class_for_redefinition_verification;
276
277 public:
278 inline void set_class_versions_map(KlassHandle *the_class,
279 KlassHandle *scratch_class) {
280 _the_class_for_redefinition_verification = the_class;
281 _scratch_class_for_redefinition_verification = scratch_class;
282 }
283
284 inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
285
286 static inline
287 Klass* class_to_verify_considering_redefinition(Klass* klass,
288 JavaThread *thread) {
289 JvmtiThreadState *state = thread->jvmti_thread_state();
290 if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
291 if ((*(state->_the_class_for_redefinition_verification))() == klass) {
292 klass = (*(state->_scratch_class_for_redefinition_verification))();
293 }
294 }
295 return klass;
296 }
297
298 // Todo: get rid of this!
299 private:
300 bool _debuggable;
301 public:
302 // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
303 bool is_debuggable() { return _debuggable; }
304 // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
305 void set_debuggable(bool debuggable) { _debuggable = debuggable; }
306
307 public:
308
309 bool may_be_walked();
310
311 // Thread local event collector setter and getter methods.
312 JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {
392 TosState earlyret_tos() { return _earlyret_tos; }
393 oop earlyret_oop() const { return _earlyret_oop; }
394 void set_earlyret_oop (oop x) { _earlyret_oop = x; }
395 jvalue earlyret_value() { return _earlyret_value; }
396 void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; }
397 void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
398
399 static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
400 static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
401 static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
402 static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
403
404 void oops_do(OopClosure* f) NOT_JVMTI_RETURN; // GC support
405
406 public:
407 void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); }
408 };
409
410 class RedefineVerifyMark : public StackObj {
411 private:
412 JvmtiThreadState *_state;
413 KlassHandle _scratch_class;
414 Handle _scratch_mirror;
415
416 public:
417 RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class,
418 JvmtiThreadState *state) : _state(state), _scratch_class(*scratch_class)
419 {
420 _state->set_class_versions_map(the_class, scratch_class);
421 _scratch_mirror = Handle(Thread::current(), _scratch_class->java_mirror());
422 (*scratch_class)->set_java_mirror((*the_class)->java_mirror());
423 }
424
425 ~RedefineVerifyMark() {
426 // Restore the scratch class's mirror, so when scratch_class is removed
427 // the correct mirror pointing to it can be cleared.
428 _scratch_class->set_java_mirror(_scratch_mirror());
429 _state->clear_class_versions_map();
430 }
431 };
432
433 #endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP
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76 private:
77 friend class JvmtiEnv;
78 JavaThread *_thread;
79 bool _hide_single_stepping;
80 bool _pending_step_for_popframe;
81 bool _pending_step_for_earlyret;
82 int _hide_level;
83
84 public:
85 enum ExceptionState {
86 ES_CLEARED,
87 ES_DETECTED,
88 ES_CAUGHT
89 };
90
91 private:
92 ExceptionState _exception_state;
93
94 // Used to send class being redefined/retransformed and kind of transform
95 // info to the class file load hook event handler.
96 Klass* _class_being_redefined;
97 JvmtiClassLoadKind _class_load_kind;
98
99 // This is only valid when is_interp_only_mode() returns true
100 int _cur_stack_depth;
101
102 JvmtiThreadEventEnable _thread_event_enable;
103
104 // for support of JvmtiEnvThreadState
105 JvmtiEnvThreadState* _head_env_thread_state;
106
107 // doubly-linked linear list of active thread state
108 // needed in order to iterate the list without holding Threads_lock
109 static JvmtiThreadState *_head;
110 JvmtiThreadState *_next;
111 JvmtiThreadState *_prev;
112
113 // holds the current dynamic code event collector, NULL if no event collector in use
114 JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
115 // holds the current vm object alloc event collector, NULL if no event collector in use
116 JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;
203 // Step pending flag is set when PopFrame is called and it is cleared
204 // when step for the Pop Frame is completed.
205 // This logic is used to distinguish b/w step for pop frame and repeat step.
206 void set_pending_step_for_popframe() { _pending_step_for_popframe = true; }
207 void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
208 bool is_pending_step_for_popframe() { return _pending_step_for_popframe; }
209 void process_pending_step_for_popframe();
210
211 // Step pending flag is set when ForceEarlyReturn is called and it is cleared
212 // when step for the ForceEarlyReturn is completed.
213 // This logic is used to distinguish b/w step for early return and repeat step.
214 void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; }
215 void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
216 bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; }
217 void process_pending_step_for_earlyret();
218
219 // Setter and getter method is used to send redefined class info
220 // when class file load hook event is posted.
221 // It is set while loading redefined class and cleared before the
222 // class file load hook event is posted.
223 inline void set_class_being_redefined(Klass* k, JvmtiClassLoadKind kind) {
224 _class_being_redefined = k;
225 _class_load_kind = kind;
226 }
227
228 inline void clear_class_being_redefined() {
229 _class_being_redefined = NULL;
230 _class_load_kind = jvmti_class_load_kind_load;
231 }
232
233 inline Klass* get_class_being_redefined() {
234 return _class_being_redefined;
235 }
236
237 inline JvmtiClassLoadKind get_class_load_kind() {
238 return _class_load_kind;
239 }
240
241 // RedefineClasses support
242 // The bug 6214132 caused the verification to fail.
243 //
244 // Below is the detailed description of the fix approach taken:
245 // 1. What's done in RedefineClasses() before verification:
246 // a) A reference to the class being redefined (_the_class) and a
247 // reference to new version of the class (_scratch_class) are
248 // saved here for use during the bytecode verification phase of
249 // RedefineClasses. See RedefineVerifyMark for how these fields
250 // are managed.
251 // b) The _java_mirror field from _the_class is copied to the
252 // _java_mirror field in _scratch_class. This means that a jclass
253 // returned for _the_class or _scratch_class will refer to the
254 // same Java mirror. The verifier will see the "one true mirror"
255 // for the class being verified.
256 // 2. What is done at verification:
257 // When the verifier makes calls into the VM to ask questions about
258 // the class being verified, it will pass the jclass to JVM_* functions.
259 // The jclass is always pointing to the mirror of _the_class.
260 // ~28 JVM_* functions called by the verifier for the information
261 // about CP entries and klass structure should check the jvmtiThreadState
262 // info about equivalent klass versions and use it to replace a Klass*
263 // of _the_class with a Klass* of _scratch_class. The function
264 // class_to_verify_considering_redefinition() must be called for it.
265 //
266 // Note again, that this redirection happens only for the verifier thread.
267 // Other threads have very small overhead by checking the existence
268 // of the jvmtiThreadSate and the information about klasses equivalence.
269 // No JNI functions need to be changed, they don't reference the klass guts.
270 // The JavaThread pointer is already available in all JVM_* functions
271 // used by the verifier, so there is no extra performance issue with it.
272
273 private:
274 Klass* _the_class_for_redefinition_verification;
275 Klass* _scratch_class_for_redefinition_verification;
276
277 public:
278 inline void set_class_versions_map(Klass* the_class,
279 Klass* scratch_class) {
280 _the_class_for_redefinition_verification = the_class;
281 _scratch_class_for_redefinition_verification = scratch_class;
282 }
283
284 inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
285
286 static inline
287 Klass* class_to_verify_considering_redefinition(Klass* klass,
288 JavaThread *thread) {
289 JvmtiThreadState *state = thread->jvmti_thread_state();
290 if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
291 if (state->_the_class_for_redefinition_verification == klass) {
292 klass = state->_scratch_class_for_redefinition_verification;
293 }
294 }
295 return klass;
296 }
297
298 // Todo: get rid of this!
299 private:
300 bool _debuggable;
301 public:
302 // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
303 bool is_debuggable() { return _debuggable; }
304 // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
305 void set_debuggable(bool debuggable) { _debuggable = debuggable; }
306
307 public:
308
309 bool may_be_walked();
310
311 // Thread local event collector setter and getter methods.
312 JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {
392 TosState earlyret_tos() { return _earlyret_tos; }
393 oop earlyret_oop() const { return _earlyret_oop; }
394 void set_earlyret_oop (oop x) { _earlyret_oop = x; }
395 jvalue earlyret_value() { return _earlyret_value; }
396 void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; }
397 void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
398
399 static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
400 static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
401 static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
402 static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
403
404 void oops_do(OopClosure* f) NOT_JVMTI_RETURN; // GC support
405
406 public:
407 void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); }
408 };
409
410 class RedefineVerifyMark : public StackObj {
411 private:
412 JvmtiThreadState* _state;
413 Klass* _scratch_class;
414 Handle _scratch_mirror;
415
416 public:
417 RedefineVerifyMark(Klass* the_class, Klass* scratch_class,
418 JvmtiThreadState *state) : _state(state), _scratch_class(scratch_class)
419 {
420 _state->set_class_versions_map(the_class, scratch_class);
421 _scratch_mirror = Handle(Thread::current(), _scratch_class->java_mirror());
422 _scratch_class->set_java_mirror(the_class->java_mirror());
423 }
424
425 ~RedefineVerifyMark() {
426 // Restore the scratch class's mirror, so when scratch_class is removed
427 // the correct mirror pointing to it can be cleared.
428 _scratch_class->set_java_mirror(_scratch_mirror());
429 _state->clear_class_versions_map();
430 }
431 };
432
433 #endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP
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