javaFrameAnchor_x86.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2002, 2007, 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
25private:
26
27  // FP value associated with _last_Java_sp:
28  intptr_t* volatile        _last_Java_fp;           // pointer is volatile not what it points to
29
30public:
31  // Each arch must define reset, save, restore
32  // These are used by objects that only care about:
33  //  1 - initializing a new state (thread creation, javaCalls)
34  //  2 - saving a current state (javaCalls)
35  //  3 - restoring an old state (javaCalls)
36
37  void clear(void) {
38    // clearing _last_Java_sp must be first
39    _last_Java_sp = NULL;
40    // fence?
41    _last_Java_fp = NULL;
42    _last_Java_pc = NULL;
43  }
44
45  void copy(JavaFrameAnchor* src) {
46    // In order to make sure the transition state is valid for "this"
47    // We must clear _last_Java_sp before copying the rest of the new data
48    //
49    // Hack Alert: Temporary bugfix for 4717480/4721647
50    // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
51    // unless the value is changing
52    //
53    if (_last_Java_sp != src->_last_Java_sp)
54      _last_Java_sp = NULL;
55
56    _last_Java_fp = src->_last_Java_fp;
57    _last_Java_pc = src->_last_Java_pc;
58    // Must be last so profiler will always see valid frame if has_last_frame() is true
59    _last_Java_sp = src->_last_Java_sp;
60  }
61
62  // Always walkable
63  bool walkable(void) { return true; }
64  // Never any thing to do since we are always walkable and can find address of return addresses
65  void make_walkable(JavaThread* thread) { }
66
67  intptr_t* last_Java_sp(void) const             { return _last_Java_sp; }
68
69private:
70
71  static ByteSize last_Java_fp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
72
73public:
74
75  void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
76
77  intptr_t*   last_Java_fp(void)                     { return _last_Java_fp; }
78  // Assert (last_Java_sp == NULL || fp == NULL)
79  void set_last_Java_fp(intptr_t* fp)                { _last_Java_fp = fp; }
80