jdk8-mips64-public/hotspot: src/cpu/zero/vm/javaFrameAnchor

6977640: Zero and Shark fixes
Summary: A number of fixes for Zero and Shark.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>

     1 /*

     2  * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.

     3  * Copyright 2007, 2008, 2010 Red Hat, Inc.

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

     5  *

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

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

     8  * published by the Free Software Foundation.

     9  *

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

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

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

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

    14  * accompanied this code).

    15  *

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

    17  * 2 along with this work; if not, write to the Free Software Foundation,

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

    19  *

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

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

    22  * questions.

    23  *

    24  */

    26  private:

    27   ZeroFrame* volatile _last_Java_fp;

    29  public:

    30   // Each arch must define reset, save, restore

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

    32   //  1 - initializing a new state (thread creation, javaCalls)

    33   //  2 - saving a current state (javaCalls)

    34   //  3 - restoring an old state (javaCalls)

    35   // Note that whenever _last_Java_sp != NULL other anchor fields

    36   // must be valid.  The profiler apparently depends on this.

    38   void clear() {

    39     // clearing _last_Java_sp must be first

    40     _last_Java_sp = NULL;

    41     // fence?

    42     _last_Java_fp = NULL;

    43     _last_Java_pc = NULL;

    44   }

    46   void copy(JavaFrameAnchor* src) {

    47     set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);

    48   }

    50   void set(intptr_t* sp, address pc, ZeroFrame* fp) {

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

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

    53     // data

    54     //

    55     // Hack Alert: Temporary bugfix for 4717480/4721647 To act like

    56     // previous version (pd_cache_state) don't NULL _last_Java_sp

    57     // unless the value is changing

    58     //

    59     if (_last_Java_sp != sp)

    60       _last_Java_sp = NULL;

    62     _last_Java_fp = fp;

    63     _last_Java_pc = pc;

    64     // Must be last so profiler will always see valid frame if

    65     // has_last_frame() is true

    66     _last_Java_sp = sp;

    67   }

    69   bool walkable() {

    70     return true;

    71   }

    73   void make_walkable(JavaThread* thread) {

    74     // nothing to do

    75   }

    77   intptr_t* last_Java_sp() const {

    78     return _last_Java_sp;

    79   }

    81   ZeroFrame* last_Java_fp() const {

    82     return _last_Java_fp;

    83   }

    85   address last_Java_pc() const {

    86     return _last_Java_pc;

    87   }

    89   static ByteSize last_Java_fp_offset() {

    90     return byte_offset_of(JavaFrameAnchor, _last_Java_fp);

    91   }

src/cpu/zero/vm/javaFrameAnchor_zero.hpp@13b87063b4d8