397 lines
15 KiB
C++
397 lines
15 KiB
C++
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/*
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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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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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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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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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||
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public:
|
||
|
|
enum EarlyretState {
|
||
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earlyret_inactive = 0,
|
||
|
|
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; }
|
||
|
|
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_ */
|