diff -r 000000000000 -r a61af66fc99e src/share/vm/prims/jvmtiThreadState.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/prims/jvmtiThreadState.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,396 @@ +/* + * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#ifndef _JAVA_JVMTITHREADSTATE_H_ +#define _JAVA_JVMTITHREADSTATE_H_ + +// +// Forward Declarations +// + +class JvmtiEnvBase; +class JvmtiEnvThreadState; +class JvmtiDynamicCodeEventCollector; + +enum JvmtiClassLoadKind { + jvmti_class_load_kind_load = 100, + jvmti_class_load_kind_retransform, + jvmti_class_load_kind_redefine +}; + +/////////////////////////////////////////////////////////////// +// +// class JvmtiEnvThreadStateIterator +// +// The only safe means of iterating through the JvmtiEnvThreadStates +// in a JvmtiThreadState. +// Note that this iteratation includes invalid environments pending +// deallocation -- in fact, some uses depend on this behavior. +// +class JvmtiEnvThreadStateIterator : public StackObj { + private: + JvmtiThreadState* state; + public: + JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state); + ~JvmtiEnvThreadStateIterator(); + JvmtiEnvThreadState* first(); + JvmtiEnvThreadState* next(JvmtiEnvThreadState* ets); +}; + + +/////////////////////////////////////////////////////////////// +// +// class JvmtiThreadState +// +// The Jvmti state for each thread (across all JvmtiEnv): +// 1. Local table of enabled events. +class JvmtiThreadState : public CHeapObj { + private: + friend class JvmtiEnv; + JavaThread *_thread; + bool _exception_detected; + bool _exception_caught; + bool _hide_single_stepping; + bool _pending_step_for_popframe; + bool _pending_step_for_earlyret; + int _hide_level; + + // Used to send class being redefined/retransformed and kind of transform + // info to the class file load hook event handler. + KlassHandle *_class_being_redefined; + JvmtiClassLoadKind _class_load_kind; + + // This is only valid when is_interp_only_mode() returns true + int _cur_stack_depth; + + JvmtiThreadEventEnable _thread_event_enable; + + // for support of JvmtiEnvThreadState + JvmtiEnvThreadState* _head_env_thread_state; + + // doubly-linked linear list of active thread state + // needed in order to iterate the list without holding Threads_lock + static JvmtiThreadState *_head; + JvmtiThreadState *_next; + JvmtiThreadState *_prev; + + // holds the current dynamic code event collector, NULL if no event collector in use + JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector; + // holds the current vm object alloc event collector, NULL if no event collector in use + JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector; + + // Should only be created by factory methods + JvmtiThreadState(JavaThread *thread); + + friend class JvmtiEnvThreadStateIterator; + inline JvmtiEnvThreadState* head_env_thread_state(); + inline void set_head_env_thread_state(JvmtiEnvThreadState* ets); + + public: + ~JvmtiThreadState(); + + // is event_type enabled and usable for this thread in any enviroments? + bool is_enabled(jvmtiEvent event_type) { + return _thread_event_enable.is_enabled(event_type); + } + + JvmtiThreadEventEnable *thread_event_enable() { + return &_thread_event_enable; + } + + // Must only be called in situations where the state is for the current thread and + // the environment can not go away. To be safe, the returned JvmtiEnvThreadState + // must be used in such a way as there can be no intervening safepoints. + inline JvmtiEnvThreadState* env_thread_state(JvmtiEnvBase *env); + + static void periodic_clean_up(); + + void add_env(JvmtiEnvBase *env); + + // Used by the interpreter for fullspeed debugging support + bool is_interp_only_mode() { return _thread->is_interp_only_mode(); } + void enter_interp_only_mode(); + void leave_interp_only_mode(); + + // access to the linked list of all JVMTI thread states + static JvmtiThreadState *first() { + assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); + return _head; + } + + JvmtiThreadState *next() { + return _next; + } + + // Current stack depth is only valid when is_interp_only_mode() returns true. + // These functions should only be called at a safepoint - usually called from same thread. + // Returns the number of Java activations on the stack. + int cur_stack_depth(); + void invalidate_cur_stack_depth(); + void incr_cur_stack_depth(); + void decr_cur_stack_depth(); + + int count_frames(); + + inline JavaThread *get_thread() { return _thread; } + inline bool is_exception_detected() { return _exception_detected; } + inline bool is_exception_caught() { return _exception_caught; } + inline void set_exception_detected() { _exception_detected = true; + _exception_caught = false; } + inline void set_exception_caught() { _exception_caught = true; + _exception_detected = false; } + + inline void clear_hide_single_stepping() { + if (_hide_level > 0) { + _hide_level--; + } else { + assert(_hide_single_stepping, "hide_single_stepping is out of phase"); + _hide_single_stepping = false; + } + } + inline bool hide_single_stepping() { return _hide_single_stepping; } + inline void set_hide_single_stepping() { + if (_hide_single_stepping) { + _hide_level++; + } else { + assert(_hide_level == 0, "hide_level is out of phase"); + _hide_single_stepping = true; + } + } + + // Step pending flag is set when PopFrame is called and it is cleared + // when step for the Pop Frame is completed. + // This logic is used to distinguish b/w step for pop frame and repeat step. + void set_pending_step_for_popframe() { _pending_step_for_popframe = true; } + void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; } + bool is_pending_step_for_popframe() { return _pending_step_for_popframe; } + void process_pending_step_for_popframe(); + + // Step pending flag is set when ForceEarlyReturn is called and it is cleared + // when step for the ForceEarlyReturn is completed. + // This logic is used to distinguish b/w step for early return and repeat step. + void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; } + void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; } + bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; } + void process_pending_step_for_earlyret(); + + // Setter and getter method is used to send redefined class info + // when class file load hook event is posted. + // It is set while loading redefined class and cleared before the + // class file load hook event is posted. + inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) { + _class_being_redefined = h_class; + _class_load_kind = kind; + } + + inline void clear_class_being_redefined() { + _class_being_redefined = NULL; + _class_load_kind = jvmti_class_load_kind_load; + } + + inline KlassHandle *get_class_being_redefined() { + return _class_being_redefined; + } + + inline JvmtiClassLoadKind get_class_load_kind() { + return _class_load_kind; + } + + // RedefineClasses support + // The bug 6214132 caused the verification to fail. + // + // Below is the detailed description of the fix approach taken: + // 1. What's done in RedefineClasses() before verification: + // a) A reference to the class being redefined (_the_class) and a + // reference to new version of the class (_scratch_class) are + // saved here for use during the bytecode verification phase of + // RedefineClasses. See RedefineVerifyMark for how these fields + // are managed. + // b) The _java_mirror field from _the_class is copied to the + // _java_mirror field in _scratch_class. This means that a jclass + // returned for _the_class or _scratch_class will refer to the + // same Java mirror. The verifier will see the "one true mirror" + // for the class being verified. + // 2. What is done at verification: + // When the verifier makes calls into the VM to ask questions about + // the class being verified, it will pass the jclass to JVM_* functions. + // The jclass is always pointing to the mirror of _the_class. + // ~28 JVM_* functions called by the verifier for the information + // about CP entries and klass structure should check the jvmtiThreadState + // info about equivalent klass versions and use it to replace a klassOop + // of _the_class with a klassOop of _scratch_class. The function + // class_to_verify_considering_redefinition() must be called for it. + // + // Note again, that this redirection happens only for the verifier thread. + // Other threads have very small overhead by checking the existence + // of the jvmtiThreadSate and the information about klasses equivalence. + // No JNI functions need to be changed, they don't reference the klass guts. + // The JavaThread pointer is already available in all JVM_* functions + // used by the verifier, so there is no extra performance issue with it. + + private: + KlassHandle *_the_class_for_redefinition_verification; + KlassHandle *_scratch_class_for_redefinition_verification; + + public: + inline void set_class_versions_map(KlassHandle *the_class, + KlassHandle *scratch_class) { + _the_class_for_redefinition_verification = the_class; + _scratch_class_for_redefinition_verification = scratch_class; + } + + inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); } + + static inline + klassOop class_to_verify_considering_redefinition(klassOop klass, + JavaThread *thread) { + JvmtiThreadState *state = thread->jvmti_thread_state(); + if (state != NULL && state->_the_class_for_redefinition_verification != NULL) { + if ((*(state->_the_class_for_redefinition_verification))() == klass) { + klass = (*(state->_scratch_class_for_redefinition_verification))(); + } + } + return klass; + } + + // Todo: get rid of this! + private: + bool _debuggable; + public: + // Should the thread be enumerated by jvmtiInternal::GetAllThreads? + bool is_debuggable() { return _debuggable; } + // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable + void set_debuggable(bool debuggable) { _debuggable = debuggable; } + + public: + + bool may_be_walked(); + + // Thread local event collector setter and getter methods. + JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() { + return _dynamic_code_event_collector; + } + JvmtiVMObjectAllocEventCollector* get_vm_object_alloc_event_collector() { + return _vm_object_alloc_event_collector; + } + void set_dynamic_code_event_collector(JvmtiDynamicCodeEventCollector* collector) { + _dynamic_code_event_collector = collector; + } + void set_vm_object_alloc_event_collector(JvmtiVMObjectAllocEventCollector* collector) { + _vm_object_alloc_event_collector = collector; + } + + + // + // Frame routines + // + + public: + + // true when the thread was suspended with a pointer to the last Java frame. + bool has_last_frame() { return _thread->has_last_Java_frame(); } + + void update_for_pop_top_frame(); + + // already holding JvmtiThreadState_lock - retrieve or create JvmtiThreadState + inline static JvmtiThreadState *state_for_while_locked(JavaThread *thread) { + assert(JvmtiThreadState_lock->is_locked(), "sanity check"); + + JvmtiThreadState *state = thread->jvmti_thread_state(); + if (state == NULL) { + state = new JvmtiThreadState(thread); + } + return state; + } + + // retrieve or create JvmtiThreadState + inline static JvmtiThreadState *state_for(JavaThread *thread) { + JvmtiThreadState *state = thread->jvmti_thread_state(); + if (state == NULL) { + MutexLocker mu(JvmtiThreadState_lock); + // check again with the lock held + state = state_for_while_locked(thread); + } else { + CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); + } + return state; + } + + // JVMTI ForceEarlyReturn support + + // This is set to earlyret_pending to signal that top Java frame + // should be returned immediately + public: + int _earlyret_state; + TosState _earlyret_tos; + jvalue _earlyret_value; + oop _earlyret_oop; // Used to return an oop result into Java code from + // ForceEarlyReturnObject, GC-preserved + + // Setting and clearing earlyret_state + // earlyret_pending indicates that a ForceEarlyReturn() has been + // requested and not yet been completed. + public: + enum EarlyretState { + earlyret_inactive = 0, + earlyret_pending = 1 + }; + + void set_earlyret_pending(void) { _earlyret_state = earlyret_pending; } + void clr_earlyret_pending(void) { _earlyret_state = earlyret_inactive; } + bool is_earlyret_pending(void) { return (_earlyret_state == earlyret_pending); } + + TosState earlyret_tos() { return _earlyret_tos; } + oop earlyret_oop() const { return _earlyret_oop; } + void set_earlyret_oop (oop x) { _earlyret_oop = x; } + jvalue earlyret_value() { return _earlyret_value; } + void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; } + void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; } + + static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); } + static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); } + static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); } + static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); } + + void oops_do(OopClosure* f); // GC support +}; + +class RedefineVerifyMark : public StackObj { + private: + JvmtiThreadState *_state; + + public: + RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class, + JvmtiThreadState *state) : _state(state) + { + _state->set_class_versions_map(the_class, scratch_class); + (*scratch_class)->set_java_mirror((*the_class)->java_mirror()); + } + + ~RedefineVerifyMark() { + _state->clear_class_versions_map(); + } +}; + +#endif /* _JAVA_JVMTITHREADSTATE_H_ */