1 /*
 2  * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
 3  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
 4  * Copyright (c) 2020, 2021, Huawei Technologies Co., Ltd. All rights reserved.
 5  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 6  *
 7  * This code is free software; you can redistribute it and/or modify it
 8  * under the terms of the GNU General Public License version 2 only, as
 9  * published by the Free Software Foundation.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
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25  */
26 
27 #ifndef CPU_RISCV_JAVAFRAMEANCHOR_RISCV_HPP
28 #define CPU_RISCV_JAVAFRAMEANCHOR_RISCV_HPP
29 
30 private:
31 
32   // FP value associated with _last_Java_sp:
33   intptr_t* volatile        _last_Java_fp;           // pointer is volatile not what it points to
34 
35 public:
36   // Each arch must define reset, save, restore
37   // These are used by objects that only care about:
38   //  1 - initializing a new state (thread creation, javaCalls)
39   //  2 - saving a current state (javaCalls)
40   //  3 - restoring an old state (javaCalls)
41 
42   void clear(void) {
43     // clearing _last_Java_sp must be first
44     _last_Java_sp = NULL;
45     OrderAccess::release();
46     _last_Java_fp = NULL;
47     _last_Java_pc = NULL;
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     //
58     assert(src != NULL, "Src should not be NULL.");
59     if (_last_Java_sp != src->_last_Java_sp) {
60       _last_Java_sp = NULL;
61       OrderAccess::release();
62     }
63     _last_Java_fp = src->_last_Java_fp;
64     _last_Java_pc = src->_last_Java_pc;
65     // Must be last so profiler will always see valid frame if has_last_frame() is true
66     _last_Java_sp = src->_last_Java_sp;
67   }
68 
69   bool walkable(void)                            { return _last_Java_sp != NULL && _last_Java_pc != NULL; }
70   void make_walkable(JavaThread* thread);
71   void capture_last_Java_pc(void);
72 
73   intptr_t* last_Java_sp(void) const             { return _last_Java_sp; }
74 
75   const address last_Java_pc(void)               { return _last_Java_pc; }
76 
77 private:
78 
79   static ByteSize last_Java_fp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
80 
81 public:
82 
83   void set_last_Java_sp(intptr_t* java_sp)           { _last_Java_sp = java_sp; OrderAccess::release(); }
84 
85   intptr_t*   last_Java_fp(void)                     { return _last_Java_fp; }
86   // Assert (last_Java_sp == NULL || fp == NULL)
87   void set_last_Java_fp(intptr_t* java_fp)           { OrderAccess::release(); _last_Java_fp = java_fp; }
88 
89 #endif // CPU_RISCV_JAVAFRAMEANCHOR_RISCV_HPP