|
Java example source code file (jvmtiThreadState.hpp)
The jvmtiThreadState.hpp Java example source code/* * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP #define SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP #include "jvmtifiles/jvmti.h" #include "memory/allocation.hpp" #include "memory/allocation.inline.hpp" #include "prims/jvmtiEventController.hpp" #include "runtime/thread.hpp" #include "utilities/growableArray.hpp" // // 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<mtInternal> { 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 clear_exception_detected() { _exception_detected = false; assert(_exception_caught == false, "_exception_caught is out of phase"); } 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 Klass* // of _the_class with a Klass* 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 Klass* class_to_verify_considering_redefinition(Klass* 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 // Can return NULL if JavaThread is exiting. 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) { if (thread->is_exiting()) { // don't add a JvmtiThreadState to a thread that is exiting return NULL; } state = new JvmtiThreadState(thread); } return state; } // retrieve or create JvmtiThreadState // Can return NULL if JavaThread is exiting. 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) NOT_JVMTI_RETURN; // GC support public: void set_should_post_on_exceptions(bool val) { _thread->set_should_post_on_exceptions_flag(val ? JNI_TRUE : JNI_FALSE); } }; class RedefineVerifyMark : public StackObj { private: JvmtiThreadState *_state; KlassHandle _scratch_class; Handle _scratch_mirror; public: RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class, JvmtiThreadState *state) : _state(state), _scratch_class(*scratch_class) { _state->set_class_versions_map(the_class, scratch_class); _scratch_mirror = Handle(_scratch_class->java_mirror()); (*scratch_class)->set_java_mirror((*the_class)->java_mirror()); } ~RedefineVerifyMark() { // Restore the scratch class's mirror, so when scratch_class is removed // the correct mirror pointing to it can be cleared. _scratch_class->set_java_mirror(_scratch_mirror()); _state->clear_class_versions_map(); } }; #endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_HPP Other Java examples (source code examples)Here is a short list of links related to this Java jvmtiThreadState.hpp source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.