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.
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23 */
24
25#ifndef CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
26#define CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
27
28private:
29  volatile int _flags;
30
31public:
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
85private:
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
103