1/*
2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2014 SAP SE. All rights reserved.
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.
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24 */
25
26#ifndef CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
27#define CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
28
29public:
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
36  inline void clear(void) {
37    // clearing _last_Java_sp must be first
38    _last_Java_sp = NULL;
39    // fence?
40    OrderAccess::release();
41    _last_Java_pc = NULL;
42  }
43
44  inline void set(intptr_t* sp, address pc) {
45    _last_Java_pc = pc;
46    OrderAccess::release();
47    _last_Java_sp = sp;
48  }
49
50  void copy(JavaFrameAnchor* src) {
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 data.
53    //
54    // Hack Alert: Temporary bugfix for 4717480/4721647
55    // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
56    // unless the value is changing.
57    if (_last_Java_sp != src->_last_Java_sp) {
58      _last_Java_sp = NULL;
59      OrderAccess::release();
60    }
61    _last_Java_pc = src->_last_Java_pc;
62    // Must be last so profiler will always see valid frame if has_last_frame() is true.
63    OrderAccess::release();
64    _last_Java_sp = src->_last_Java_sp;
65  }
66
67  // Always walkable.
68  bool walkable(void) { return true; }
69  // Never any thing to do since we are always walkable and can find address of return addresses.
70  void make_walkable(JavaThread* thread) { }
71
72  intptr_t* last_Java_sp(void) const  { return _last_Java_sp; }
73
74  address last_Java_pc(void)          { return _last_Java_pc; }
75
76  void set_last_Java_sp(intptr_t* sp) { OrderAccess::release(); _last_Java_sp = sp; }
77
78#endif // CPU_PPC_VM_JAVAFRAMEANCHOR_PPC_HPP
79