duke@435: /*
duke@435:  * Copyright 2002-2005 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: private:
duke@435:   volatile int _flags;
duke@435: 
duke@435: public:
duke@435: 
duke@435:    enum pd_Constants {
duke@435:      flushed = 1                                 // winodows have flushed
duke@435:    };
duke@435: 
duke@435:   int flags(void)                                { return _flags; }
duke@435:   void set_flags(int flags)                      { _flags = flags; }
duke@435: 
duke@435:   static ByteSize flags_offset()                 { return byte_offset_of(JavaFrameAnchor, _flags); }
duke@435: 
duke@435:   // Each arch must define clear, copy
duke@435:   // These are used by objects that only care about:
duke@435:   //  1 - initializing a new state (thread creation, javaCalls)
duke@435:   //  2 - saving a current state (javaCalls)
duke@435:   //  3 - restoring an old state (javaCalls)
duke@435: 
duke@435:   void clear(void) {
duke@435:     // clearing _last_Java_sp must be first
duke@435:     _last_Java_sp = NULL;
duke@435:     // fence?
duke@435:     _flags = 0;
duke@435:     _last_Java_pc = NULL;
duke@435:   }
duke@435: 
duke@435:   void copy(JavaFrameAnchor* src) {
duke@435:     // In order to make sure the transition state is valid for "this"
duke@435:     // We must clear _last_Java_sp before copying the rest of the new data
duke@435:     //
duke@435:     // Hack Alert: Temporary bugfix for 4717480/4721647
duke@435:     // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
duke@435:     // unless the value is changing
duke@435:     //
duke@435:     if (_last_Java_sp != src->_last_Java_sp)
duke@435:       _last_Java_sp = NULL;
duke@435: 
duke@435:     _flags = src->_flags;
duke@435:     _last_Java_pc = src->_last_Java_pc;
duke@435:     // Must be last so profiler will always see valid frame if has_last_frame() is true
duke@435:     _last_Java_sp = src->_last_Java_sp;
duke@435:   }
duke@435: 
duke@435:   // Is stack walkable
duke@435:   inline bool walkable( void) {
duke@435:         return _flags & flushed;
duke@435:   }
duke@435: 
duke@435:   void make_walkable(JavaThread* thread);
duke@435: 
duke@435:   void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
duke@435: 
duke@435:   // These are only used by friends
duke@435: private:
duke@435: 
duke@435:   intptr_t* last_Java_sp() const {
duke@435:     // _last_Java_sp will always be a an unbiased stack pointer
duke@435:     // if is is biased then some setter screwed up. This is
duke@435:     // deadly.
duke@435: #ifdef _LP64
duke@435:     assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
duke@435: #endif
duke@435:     return _last_Java_sp;
duke@435:   }
duke@435: 
duke@435:   void capture_last_Java_pc(intptr_t* sp);
duke@435: 
duke@435:   void set_window_flushed( void) {
duke@435:     _flags |= flushed;
duke@435:     OrderAccess::fence();
duke@435:   }