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 /*

  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP

 #define CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP

 private:

   volatile int _flags;

 public:

    enum pd_Constants {

      flushed = 1                                 // winodows have flushed

    };

   int flags(void)                                { return _flags; }

   void set_flags(int flags)                      { _flags = flags; }

   static ByteSize flags_offset()                 { return byte_offset_of(JavaFrameAnchor, _flags); }

   // Each arch must define clear, copy

   // These are used by objects that only care about:

   //  1 - initializing a new state (thread creation, javaCalls)

   //  2 - saving a current state (javaCalls)

   //  3 - restoring an old state (javaCalls)

   void clear(void) {

     // clearing _last_Java_sp must be first

     _last_Java_sp = NULL;

     // fence?

     _flags = 0;

     _last_Java_pc = NULL;

   }

   void copy(JavaFrameAnchor* src) {

     // In order to make sure the transition state is valid for "this"

     // We must clear _last_Java_sp before copying the rest of the new data

     //

     // Hack Alert: Temporary bugfix for 4717480/4721647

     // To act like previous version (pd_cache_state) don't NULL _last_Java_sp

     // unless the value is changing

     //

     if (_last_Java_sp != src->_last_Java_sp)

       _last_Java_sp = NULL;

     _flags = src->_flags;

     _last_Java_pc = src->_last_Java_pc;

     // Must be last so profiler will always see valid frame if has_last_frame() is true

     _last_Java_sp = src->_last_Java_sp;

   }

   // Is stack walkable

   inline bool walkable( void) {

         return _flags & flushed;

   }

   void make_walkable(JavaThread* thread);

   void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }

   address last_Java_pc(void)                     { return _last_Java_pc; }

   // These are only used by friends

 private:

   intptr_t* last_Java_sp() const {

     // _last_Java_sp will always be a an unbiased stack pointer

     // if is is biased then some setter screwed up. This is

     // deadly.

 #ifdef _LP64

     assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");

 #endif

     return _last_Java_sp;

   }

   void capture_last_Java_pc(intptr_t* sp);

   void set_window_flushed( void) {

     _flags |= flushed;

     OrderAccess::fence();

   }

 #endif // CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP