1 /*
2  * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
3  * Copyright 2007, 2008, 2010 Red Hat, Inc.
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.
23  *
24  */
25 
26 #ifndef CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP
27 #define CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP
28 
29  private:
30   ZeroFrame* volatile _last_Java_fp;
31 
32  public:
33   // Each arch must define reset, save, restore
34   // These are used by objects that only care about:
35   //  1 - initializing a new state (thread creation, javaCalls)
36   //  2 - saving a current state (javaCalls)
37   //  3 - restoring an old state (javaCalls)
38   // Note that whenever _last_Java_sp != NULL other anchor fields
39   // must be valid.  The profiler apparently depends on this.
40 
41   void clear() {
42     // clearing _last_Java_sp must be first
43     _last_Java_sp = NULL;
44     // fence?
45     _last_Java_fp = NULL;
46     _last_Java_pc = NULL;
47   }
48 
copy(JavaFrameAnchor * src)49   void copy(JavaFrameAnchor* src) {
50     set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
51   }
52 
set(intptr_t * sp,address pc,ZeroFrame * fp)53   void set(intptr_t* sp, address pc, ZeroFrame* fp) {
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
56     // data
57     //
58     // Hack Alert: Temporary bugfix for 4717480/4721647 To act like
59     // previous version (pd_cache_state) don't NULL _last_Java_sp
60     // unless the value is changing
61     //
62     if (_last_Java_sp != sp)
63       _last_Java_sp = NULL;
64 
65     _last_Java_fp = fp;
66     _last_Java_pc = pc;
67     // Must be last so profiler will always see valid frame if
68     // has_last_frame() is true
69     _last_Java_sp = sp;
70   }
71 
walkable()72   bool walkable() {
73     return true;
74   }
75 
make_walkable(JavaThread * thread)76   void make_walkable(JavaThread* thread) {
77     // nothing to do
78   }
79 
last_Java_sp() const80   intptr_t* last_Java_sp() const {
81     return _last_Java_sp;
82   }
83 
last_Java_fp() const84   ZeroFrame* last_Java_fp() const {
85     return _last_Java_fp;
86   }
87 
last_Java_pc() const88   address last_Java_pc() const {
89     return _last_Java_pc;
90   }
91 
last_Java_fp_offset()92   static ByteSize last_Java_fp_offset() {
93     return byte_offset_of(JavaFrameAnchor, _last_Java_fp);
94   }
95 
set_last_Java_sp(intptr_t * sp)96   void set_last_Java_sp(intptr_t* sp)   { _last_Java_sp = sp; }
97 
98 #endif // CPU_ZERO_JAVAFRAMEANCHOR_ZERO_HPP
99