javaFrameAnchor_sparc.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2002, 2005, 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  volatile int _flags;
27
28public:
29
30   enum pd_Constants {
31     flushed = 1                                 // winodows have flushed
32   };
33
34  int flags(void)                                { return _flags; }
35  void set_flags(int flags)                      { _flags = flags; }
36
37  static ByteSize flags_offset()                 { return byte_offset_of(JavaFrameAnchor, _flags); }
38
39  // Each arch must define clear, copy
40  // These are used by objects that only care about:
41  //  1 - initializing a new state (thread creation, javaCalls)
42  //  2 - saving a current state (javaCalls)
43  //  3 - restoring an old state (javaCalls)
44
45  void clear(void) {
46    // clearing _last_Java_sp must be first
47    _last_Java_sp = NULL;
48    // fence?
49    _flags = 0;
50    _last_Java_pc = NULL;
51  }
52
53  void copy(JavaFrameAnchor* src) {
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 data
56    //
57    // Hack Alert: Temporary bugfix for 4717480/4721647
58    // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
59    // unless the value is changing
60    //
61    if (_last_Java_sp != src->_last_Java_sp)
62      _last_Java_sp = NULL;
63
64    _flags = src->_flags;
65    _last_Java_pc = src->_last_Java_pc;
66    // Must be last so profiler will always see valid frame if has_last_frame() is true
67    _last_Java_sp = src->_last_Java_sp;
68  }
69
70  // Is stack walkable
71  inline bool walkable( void) {
72        return _flags & flushed;
73  }
74
75  void make_walkable(JavaThread* thread);
76
77  void set_last_Java_sp(intptr_t* sp)            { _last_Java_sp = sp; }
78
79  // These are only used by friends
80private:
81
82  intptr_t* last_Java_sp() const {
83    // _last_Java_sp will always be a an unbiased stack pointer
84    // if is is biased then some setter screwed up. This is
85    // deadly.
86#ifdef _LP64
87    assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
88#endif
89    return _last_Java_sp;
90  }
91
92  void capture_last_Java_pc(intptr_t* sp);
93
94  void set_window_flushed( void) {
95    _flags |= flushed;
96    OrderAccess::fence();
97  }
98