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comparison src/cpu/sparc/vm/javaFrameAnchor_sparc.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 private:
26 volatile int _flags;
27
28 public:
29
30 enum pd_Constants {
31 flushed = 1 // winodows have flushed
32 };
33
34 int flags(void) { return _flags; }
35 void set_flags(int flags) { _flags = flags; }
36
37 static ByteSize flags_offset() { return byte_offset_of(JavaFrameAnchor, _flags); }
38
39 // Each arch must define clear, copy
40 // These are used by objects that only care about:
41 // 1 - initializing a new state (thread creation, javaCalls)
42 // 2 - saving a current state (javaCalls)
43 // 3 - restoring an old state (javaCalls)
44
45 void clear(void) {
46 // clearing _last_Java_sp must be first
47 _last_Java_sp = NULL;
48 // fence?
49 _flags = 0;
50 _last_Java_pc = NULL;
51 }
52
53 void copy(JavaFrameAnchor* src) {
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 data
56 //
57 // Hack Alert: Temporary bugfix for 4717480/4721647
58 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
59 // unless the value is changing
60 //
61 if (_last_Java_sp != src->_last_Java_sp)
62 _last_Java_sp = NULL;
63
64 _flags = src->_flags;
65 _last_Java_pc = src->_last_Java_pc;
66 // Must be last so profiler will always see valid frame if has_last_frame() is true
67 _last_Java_sp = src->_last_Java_sp;
68 }
69
70 // Is stack walkable
71 inline bool walkable( void) {
72 return _flags & flushed;
73 }
74
75 void make_walkable(JavaThread* thread);
76
77 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
78
79 // These are only used by friends
80 private:
81
82 intptr_t* last_Java_sp() const {
83 // _last_Java_sp will always be a an unbiased stack pointer
84 // if is is biased then some setter screwed up. This is
85 // deadly.
86 #ifdef _LP64
87 assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
88 #endif
89 return _last_Java_sp;
90 }
91
92 void capture_last_Java_pc(intptr_t* sp);
93
94 void set_window_flushed( void) {
95 _flags |= flushed;
96 OrderAccess::fence();
97 }