1/*
2 * Copyright (c) 2002, 2019, 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
25#ifndef CPU_X86_JAVAFRAMEANCHOR_X86_HPP
26#define CPU_X86_JAVAFRAMEANCHOR_X86_HPP
27
28private:
29
30 // FP value associated with _last_Java_sp:
31 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to
32
33public:
34 // Each arch must define reset, save, restore
35 // These are used by objects that only care about:
36 // 1 - initializing a new state (thread creation, javaCalls)
37 // 2 - saving a current state (javaCalls)
38 // 3 - restoring an old state (javaCalls)
39
40 void clear(void) {
41 // clearing _last_Java_sp must be first
42 _last_Java_sp = NULL;
43 // fence?
44 _last_Java_fp = NULL;
45 _last_Java_pc = NULL;
46 }
47
48 void copy(JavaFrameAnchor* src) {
49 // In order to make sure the transition state is valid for "this"
50 // We must clear _last_Java_sp before copying the rest of the new data
51 //
52 // Hack Alert: Temporary bugfix for 4717480/4721647
53 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
54 // unless the value is changing
55 //
56 if (_last_Java_sp != src->_last_Java_sp)
57 _last_Java_sp = NULL;
58
59 _last_Java_fp = src->_last_Java_fp;
60 _last_Java_pc = src->_last_Java_pc;
61 // Must be last so profiler will always see valid frame if has_last_frame() is true
62 _last_Java_sp = src->_last_Java_sp;
63 }
64
65 bool walkable(void) { return _last_Java_sp != NULL && _last_Java_pc != NULL; }
66 void make_walkable(JavaThread* thread);
67 void capture_last_Java_pc(void);
68
69 intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
70
71 address last_Java_pc(void) { return _last_Java_pc; }
72
73private:
74
75 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
76
77public:
78
79 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
80
81 intptr_t* last_Java_fp(void) { return _last_Java_fp; }
82 // Assert (last_Java_sp == NULL || fp == NULL)
83 void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }
84
85#endif // CPU_X86_JAVAFRAMEANCHOR_X86_HPP
86