author | ysr |
Thu, 03 Dec 2009 15:01:57 -0800 | |
changeset 4461 | c17c526d36ef |
parent 2135 | f82c3012ec86 |
child 4761 | bdb7375a1fee |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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#ifndef _JAVA_JVMTITHREADSTATE_H_ |
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#define _JAVA_JVMTITHREADSTATE_H_ |
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// |
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// Forward Declarations |
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// |
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class JvmtiEnvBase; |
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class JvmtiEnvThreadState; |
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class JvmtiDynamicCodeEventCollector; |
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enum JvmtiClassLoadKind { |
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jvmti_class_load_kind_load = 100, |
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jvmti_class_load_kind_retransform, |
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jvmti_class_load_kind_redefine |
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}; |
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/////////////////////////////////////////////////////////////// |
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// |
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// class JvmtiEnvThreadStateIterator |
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// |
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// The only safe means of iterating through the JvmtiEnvThreadStates |
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// in a JvmtiThreadState. |
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// Note that this iteratation includes invalid environments pending |
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// deallocation -- in fact, some uses depend on this behavior. |
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// |
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class JvmtiEnvThreadStateIterator : public StackObj { |
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private: |
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JvmtiThreadState* state; |
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public: |
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JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state); |
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~JvmtiEnvThreadStateIterator(); |
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JvmtiEnvThreadState* first(); |
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JvmtiEnvThreadState* next(JvmtiEnvThreadState* ets); |
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}; |
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/////////////////////////////////////////////////////////////// |
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// |
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// class JvmtiThreadState |
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// |
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// The Jvmti state for each thread (across all JvmtiEnv): |
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// 1. Local table of enabled events. |
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class JvmtiThreadState : public CHeapObj { |
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private: |
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friend class JvmtiEnv; |
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JavaThread *_thread; |
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bool _exception_detected; |
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bool _exception_caught; |
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bool _hide_single_stepping; |
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bool _pending_step_for_popframe; |
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bool _pending_step_for_earlyret; |
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int _hide_level; |
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// Used to send class being redefined/retransformed and kind of transform |
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// info to the class file load hook event handler. |
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KlassHandle *_class_being_redefined; |
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JvmtiClassLoadKind _class_load_kind; |
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// This is only valid when is_interp_only_mode() returns true |
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int _cur_stack_depth; |
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JvmtiThreadEventEnable _thread_event_enable; |
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// for support of JvmtiEnvThreadState |
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JvmtiEnvThreadState* _head_env_thread_state; |
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// doubly-linked linear list of active thread state |
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// needed in order to iterate the list without holding Threads_lock |
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static JvmtiThreadState *_head; |
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JvmtiThreadState *_next; |
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JvmtiThreadState *_prev; |
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// holds the current dynamic code event collector, NULL if no event collector in use |
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JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector; |
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// holds the current vm object alloc event collector, NULL if no event collector in use |
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JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector; |
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// Should only be created by factory methods |
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JvmtiThreadState(JavaThread *thread); |
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friend class JvmtiEnvThreadStateIterator; |
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inline JvmtiEnvThreadState* head_env_thread_state(); |
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inline void set_head_env_thread_state(JvmtiEnvThreadState* ets); |
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public: |
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~JvmtiThreadState(); |
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// is event_type enabled and usable for this thread in any enviroments? |
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bool is_enabled(jvmtiEvent event_type) { |
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return _thread_event_enable.is_enabled(event_type); |
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} |
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JvmtiThreadEventEnable *thread_event_enable() { |
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return &_thread_event_enable; |
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} |
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// Must only be called in situations where the state is for the current thread and |
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// the environment can not go away. To be safe, the returned JvmtiEnvThreadState |
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// must be used in such a way as there can be no intervening safepoints. |
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inline JvmtiEnvThreadState* env_thread_state(JvmtiEnvBase *env); |
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static void periodic_clean_up(); |
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void add_env(JvmtiEnvBase *env); |
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// Used by the interpreter for fullspeed debugging support |
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bool is_interp_only_mode() { return _thread->is_interp_only_mode(); } |
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void enter_interp_only_mode(); |
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void leave_interp_only_mode(); |
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// access to the linked list of all JVMTI thread states |
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static JvmtiThreadState *first() { |
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
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return _head; |
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} |
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JvmtiThreadState *next() { |
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return _next; |
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} |
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// Current stack depth is only valid when is_interp_only_mode() returns true. |
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// These functions should only be called at a safepoint - usually called from same thread. |
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// Returns the number of Java activations on the stack. |
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int cur_stack_depth(); |
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void invalidate_cur_stack_depth(); |
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void incr_cur_stack_depth(); |
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void decr_cur_stack_depth(); |
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int count_frames(); |
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inline JavaThread *get_thread() { return _thread; } |
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inline bool is_exception_detected() { return _exception_detected; } |
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inline bool is_exception_caught() { return _exception_caught; } |
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inline void set_exception_detected() { _exception_detected = true; |
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_exception_caught = false; } |
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inline void set_exception_caught() { _exception_caught = true; |
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_exception_detected = false; } |
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inline void clear_hide_single_stepping() { |
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if (_hide_level > 0) { |
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_hide_level--; |
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} else { |
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assert(_hide_single_stepping, "hide_single_stepping is out of phase"); |
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_hide_single_stepping = false; |
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} |
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} |
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inline bool hide_single_stepping() { return _hide_single_stepping; } |
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inline void set_hide_single_stepping() { |
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if (_hide_single_stepping) { |
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_hide_level++; |
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} else { |
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assert(_hide_level == 0, "hide_level is out of phase"); |
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_hide_single_stepping = true; |
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} |
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} |
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// Step pending flag is set when PopFrame is called and it is cleared |
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// when step for the Pop Frame is completed. |
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// This logic is used to distinguish b/w step for pop frame and repeat step. |
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void set_pending_step_for_popframe() { _pending_step_for_popframe = true; } |
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void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; } |
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bool is_pending_step_for_popframe() { return _pending_step_for_popframe; } |
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void process_pending_step_for_popframe(); |
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// Step pending flag is set when ForceEarlyReturn is called and it is cleared |
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// when step for the ForceEarlyReturn is completed. |
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// This logic is used to distinguish b/w step for early return and repeat step. |
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void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; } |
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void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; } |
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bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; } |
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void process_pending_step_for_earlyret(); |
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// Setter and getter method is used to send redefined class info |
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// when class file load hook event is posted. |
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// It is set while loading redefined class and cleared before the |
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// class file load hook event is posted. |
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inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) { |
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_class_being_redefined = h_class; |
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_class_load_kind = kind; |
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} |
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inline void clear_class_being_redefined() { |
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_class_being_redefined = NULL; |
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_class_load_kind = jvmti_class_load_kind_load; |
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} |
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inline KlassHandle *get_class_being_redefined() { |
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return _class_being_redefined; |
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} |
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inline JvmtiClassLoadKind get_class_load_kind() { |
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return _class_load_kind; |
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} |
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// RedefineClasses support |
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// The bug 6214132 caused the verification to fail. |
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// |
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// Below is the detailed description of the fix approach taken: |
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// 1. What's done in RedefineClasses() before verification: |
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// a) A reference to the class being redefined (_the_class) and a |
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// reference to new version of the class (_scratch_class) are |
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// saved here for use during the bytecode verification phase of |
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// RedefineClasses. See RedefineVerifyMark for how these fields |
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// are managed. |
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// b) The _java_mirror field from _the_class is copied to the |
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// _java_mirror field in _scratch_class. This means that a jclass |
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// returned for _the_class or _scratch_class will refer to the |
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// same Java mirror. The verifier will see the "one true mirror" |
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// for the class being verified. |
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// 2. What is done at verification: |
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// When the verifier makes calls into the VM to ask questions about |
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// the class being verified, it will pass the jclass to JVM_* functions. |
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// The jclass is always pointing to the mirror of _the_class. |
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// ~28 JVM_* functions called by the verifier for the information |
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// about CP entries and klass structure should check the jvmtiThreadState |
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// info about equivalent klass versions and use it to replace a klassOop |
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// of _the_class with a klassOop of _scratch_class. The function |
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// class_to_verify_considering_redefinition() must be called for it. |
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// |
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// Note again, that this redirection happens only for the verifier thread. |
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// Other threads have very small overhead by checking the existence |
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// of the jvmtiThreadSate and the information about klasses equivalence. |
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// No JNI functions need to be changed, they don't reference the klass guts. |
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// The JavaThread pointer is already available in all JVM_* functions |
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// used by the verifier, so there is no extra performance issue with it. |
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private: |
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KlassHandle *_the_class_for_redefinition_verification; |
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KlassHandle *_scratch_class_for_redefinition_verification; |
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public: |
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inline void set_class_versions_map(KlassHandle *the_class, |
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KlassHandle *scratch_class) { |
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_the_class_for_redefinition_verification = the_class; |
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_scratch_class_for_redefinition_verification = scratch_class; |
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} |
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inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); } |
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static inline |
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klassOop class_to_verify_considering_redefinition(klassOop klass, |
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JavaThread *thread) { |
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JvmtiThreadState *state = thread->jvmti_thread_state(); |
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if (state != NULL && state->_the_class_for_redefinition_verification != NULL) { |
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if ((*(state->_the_class_for_redefinition_verification))() == klass) { |
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klass = (*(state->_scratch_class_for_redefinition_verification))(); |
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} |
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} |
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return klass; |
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} |
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// Todo: get rid of this! |
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private: |
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bool _debuggable; |
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public: |
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// Should the thread be enumerated by jvmtiInternal::GetAllThreads? |
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bool is_debuggable() { return _debuggable; } |
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// If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable |
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void set_debuggable(bool debuggable) { _debuggable = debuggable; } |
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public: |
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bool may_be_walked(); |
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// Thread local event collector setter and getter methods. |
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JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() { |
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return _dynamic_code_event_collector; |
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} |
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JvmtiVMObjectAllocEventCollector* get_vm_object_alloc_event_collector() { |
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return _vm_object_alloc_event_collector; |
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} |
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void set_dynamic_code_event_collector(JvmtiDynamicCodeEventCollector* collector) { |
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_dynamic_code_event_collector = collector; |
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} |
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void set_vm_object_alloc_event_collector(JvmtiVMObjectAllocEventCollector* collector) { |
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_vm_object_alloc_event_collector = collector; |
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} |
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// |
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// Frame routines |
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// |
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public: |
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// true when the thread was suspended with a pointer to the last Java frame. |
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bool has_last_frame() { return _thread->has_last_Java_frame(); } |
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void update_for_pop_top_frame(); |
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// already holding JvmtiThreadState_lock - retrieve or create JvmtiThreadState |
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// Can return NULL if JavaThread is exiting. |
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inline static JvmtiThreadState *state_for_while_locked(JavaThread *thread) { |
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assert(JvmtiThreadState_lock->is_locked(), "sanity check"); |
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JvmtiThreadState *state = thread->jvmti_thread_state(); |
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if (state == NULL) { |
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if (thread->is_exiting()) { |
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// don't add a JvmtiThreadState to a thread that is exiting |
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return NULL; |
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} |
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state = new JvmtiThreadState(thread); |
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} |
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return state; |
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} |
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// retrieve or create JvmtiThreadState |
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// Can return NULL if JavaThread is exiting. |
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inline static JvmtiThreadState *state_for(JavaThread *thread) { |
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JvmtiThreadState *state = thread->jvmti_thread_state(); |
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if (state == NULL) { |
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MutexLocker mu(JvmtiThreadState_lock); |
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// check again with the lock held |
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state = state_for_while_locked(thread); |
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} else { |
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CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
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} |
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return state; |
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} |
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// JVMTI ForceEarlyReturn support |
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// This is set to earlyret_pending to signal that top Java frame |
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// should be returned immediately |
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public: |
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int _earlyret_state; |
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TosState _earlyret_tos; |
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jvalue _earlyret_value; |
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oop _earlyret_oop; // Used to return an oop result into Java code from |
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// ForceEarlyReturnObject, GC-preserved |
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// Setting and clearing earlyret_state |
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// earlyret_pending indicates that a ForceEarlyReturn() has been |
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// requested and not yet been completed. |
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public: |
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enum EarlyretState { |
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earlyret_inactive = 0, |
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earlyret_pending = 1 |
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}; |
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void set_earlyret_pending(void) { _earlyret_state = earlyret_pending; } |
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void clr_earlyret_pending(void) { _earlyret_state = earlyret_inactive; } |
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bool is_earlyret_pending(void) { return (_earlyret_state == earlyret_pending); } |
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TosState earlyret_tos() { return _earlyret_tos; } |
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oop earlyret_oop() const { return _earlyret_oop; } |
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void set_earlyret_oop (oop x) { _earlyret_oop = x; } |
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jvalue earlyret_value() { return _earlyret_value; } |
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void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; } |
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void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; } |
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static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); } |
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static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); } |
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static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); } |
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static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); } |
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void oops_do(OopClosure* f); // GC support |
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}; |
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385 |
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386 |
class RedefineVerifyMark : public StackObj { |
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387 |
private: |
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388 |
JvmtiThreadState *_state; |
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389 |
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390 |
public: |
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391 |
RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class, |
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392 |
JvmtiThreadState *state) : _state(state) |
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{ |
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394 |
_state->set_class_versions_map(the_class, scratch_class); |
|
395 |
(*scratch_class)->set_java_mirror((*the_class)->java_mirror()); |
|
396 |
} |
|
397 |
||
398 |
~RedefineVerifyMark() { |
|
399 |
_state->clear_class_versions_map(); |
|
400 |
} |
|
401 |
}; |
|
402 |
||
403 |
#endif /* _JAVA_JVMTITHREADSTATE_H_ */ |