aoqi@0: /*
aoqi@0:  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
aoqi@0: #define CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
aoqi@0: 
aoqi@0: private:
aoqi@0:   volatile int _flags;
aoqi@0: 
aoqi@0: public:
aoqi@0: 
aoqi@0:    enum pd_Constants {
aoqi@0:      flushed = 1                                 // winodows have flushed
aoqi@0:    };
aoqi@0: 
aoqi@0:   int flags(void)                                { return _flags; }
aoqi@0:   void set_flags(int flags)                      { _flags = flags; }
aoqi@0: 
aoqi@0:   static ByteSize flags_offset()                 { return byte_offset_of(JavaFrameAnchor, _flags); }
aoqi@0: 
aoqi@0:   // Each arch must define clear, copy
aoqi@0:   // These are used by objects that only care about:
aoqi@0:   //  1 - initializing a new state (thread creation, javaCalls)
aoqi@0:   //  2 - saving a current state (javaCalls)
aoqi@0:   //  3 - restoring an old state (javaCalls)
aoqi@0: 
aoqi@0:   void clear(void) {
aoqi@0:     // clearing _last_Java_sp must be first
aoqi@0:     _last_Java_sp = NULL;
aoqi@0:     // fence?
aoqi@0:     _flags = 0;
aoqi@0:     _last_Java_pc = NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:   void copy(JavaFrameAnchor* src) {
aoqi@0:     // In order to make sure the transition state is valid for "this"
aoqi@0:     // We must clear _last_Java_sp before copying the rest of the new data
aoqi@0:     //
aoqi@0:     // Hack Alert: Temporary bugfix for 4717480/4721647
aoqi@0:     // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
aoqi@0:     // unless the value is changing
aoqi@0:     //
aoqi@0:     if (_last_Java_sp != src->_last_Java_sp)
aoqi@0:       _last_Java_sp = NULL;
aoqi@0: 
aoqi@0:     _flags = src->_flags;
aoqi@0:     _last_Java_pc = src->_last_Java_pc;
aoqi@0:     // Must be last so profiler will always see valid frame if has_last_frame() is true
aoqi@0:     _last_Java_sp = src->_last_Java_sp;
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Is stack walkable
aoqi@0:   inline bool walkable( void) {
aoqi@0:         return _flags & flushed;
aoqi@0:   }
aoqi@0: 
aoqi@0:   void make_walkable(JavaThread* thread);
aoqi@0: 
aoqi@0:   void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
aoqi@0: 
aoqi@0:   address last_Java_pc(void)                     { return _last_Java_pc; }
aoqi@0: 
aoqi@0:   // These are only used by friends
aoqi@0: private:
aoqi@0: 
aoqi@0:   intptr_t* last_Java_sp() const {
aoqi@0:     // _last_Java_sp will always be a an unbiased stack pointer
aoqi@0:     // if is is biased then some setter screwed up. This is
aoqi@0:     // deadly.
aoqi@0: #ifdef _LP64
aoqi@0:     assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
aoqi@0: #endif
aoqi@0:     return _last_Java_sp;
aoqi@0:   }
aoqi@0: 
aoqi@0:   void capture_last_Java_pc(intptr_t* sp);
aoqi@0: 
aoqi@0:   void set_window_flushed( void) {
aoqi@0:     _flags |= flushed;
aoqi@0:     OrderAccess::fence();
aoqi@0:   }
aoqi@0: 
aoqi@0: #endif // CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP