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

     1 /*

     2  * Copyright (c) 2003, 2010, 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 #ifndef CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP

    27 #define CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP

    29  private:

    30   ZeroFrame* volatile _last_Java_fp;

    32  public:

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

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

    35   //  1 - initializing a new state (thread creation, javaCalls)

    36   //  2 - saving a current state (javaCalls)

    37   //  3 - restoring an old state (javaCalls)

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

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

    41   void clear() {

    42     // clearing _last_Java_sp must be first

    43     _last_Java_sp = NULL;

    44     // fence?

    45     _last_Java_fp = NULL;

    46     _last_Java_pc = NULL;

    47   }

    49   void copy(JavaFrameAnchor* src) {

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

    51   }

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

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

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

    56     // data

    57     //

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

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

    60     // unless the value is changing

    61     //

    62     if (_last_Java_sp != sp)

    63       _last_Java_sp = NULL;

    65     _last_Java_fp = fp;

    66     _last_Java_pc = pc;

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

    68     // has_last_frame() is true

    69     _last_Java_sp = sp;

    70   }

    72   bool walkable() {

    73     return true;

    74   }

    76   void make_walkable(JavaThread* thread) {

    77     // nothing to do

    78   }

    80   intptr_t* last_Java_sp() const {

    81     return _last_Java_sp;

    82   }

    84   ZeroFrame* last_Java_fp() const {

    85     return _last_Java_fp;

    86   }

    88   address last_Java_pc() const {

    89     return _last_Java_pc;

    90   }

    92   static ByteSize last_Java_fp_offset() {

    93     return byte_offset_of(JavaFrameAnchor, _last_Java_fp);

    94   }

    96 #endif // CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP

src/cpu/zero/vm/javaFrameAnchor_zero.hpp@a9becfeecd1b