1 /*

     2  * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP

    26 #define CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP

    27 

    28 private:

    29   volatile int _flags;

    30 

    31 public:

    32 

    33    enum pd_Constants {

    34      flushed = 1                                 // winodows have flushed

    35    };

    36 

    37   int flags(void)                                { return _flags; }

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

    39 

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

    41 

    42   // Each arch must define clear, copy

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

    44   //  1 - initializing a new state (thread creation, javaCalls)

    45   //  2 - saving a current state (javaCalls)

    46   //  3 - restoring an old state (javaCalls)

    47 

    48   void clear(void) {

    49     // clearing _last_Java_sp must be first

    50     _last_Java_sp = NULL;

    51     // fence?

    52     _flags = 0;

    53     _last_Java_pc = NULL;

    54   }

    55 

    56   void copy(JavaFrameAnchor* src) {

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

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

    59     //

    60     // Hack Alert: Temporary bugfix for 4717480/4721647

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

    62     // unless the value is changing

    63     //

    64     if (_last_Java_sp != src->_last_Java_sp)

    65       _last_Java_sp = NULL;

    66 

    67     _flags = src->_flags;

    68     _last_Java_pc = src->_last_Java_pc;

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

    70     _last_Java_sp = src->_last_Java_sp;

    71   }

    72 

    73   // Is stack walkable

    74   inline bool walkable( void) {

    75         return _flags & flushed;

    76   }

    77 

    78   void make_walkable(JavaThread* thread);

    79 

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

    81 

    82   address last_Java_pc(void)                     { return _last_Java_pc; }

    83 

    84   // These are only used by friends

    85 private:

    86 

    87   intptr_t* last_Java_sp() const {

    88     // _last_Java_sp will always be a an unbiased stack pointer

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

    90     // deadly.

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

    92     return _last_Java_sp;

    93   }

    94 

    95   void capture_last_Java_pc(intptr_t* sp);

    96 

    97   void set_window_flushed( void) {

    98     _flags |= flushed;

    99     OrderAccess::fence();

   100   }

   101 

   102 #endif // CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP