truffle: src/share/vm/prims/jvmtiThreadState.hpp comparison

comparison src/share/vm/prims/jvmtiThreadState.hpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	0386097d43d8

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--1:000000000000
+:a61af66fc99e
+/*
+* 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_ */

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comparison src/share/vm/prims/jvmtiThreadState.hpp @ 0:a61af66fc99e jdk7-b24