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comparison src/cpu/x86/vm/javaFrameAnchor_x86.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 2002-2007 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
27 // FP value associated with _last_Java_sp:
28 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to
29
30 public:
31 // Each arch must define reset, save, restore
32 // These are used by objects that only care about:
33 // 1 - initializing a new state (thread creation, javaCalls)
34 // 2 - saving a current state (javaCalls)
35 // 3 - restoring an old state (javaCalls)
36
37 void clear(void) {
38 // clearing _last_Java_sp must be first
39 _last_Java_sp = NULL;
40 // fence?
41 _last_Java_fp = NULL;
42 _last_Java_pc = NULL;
43 }
44
45 void copy(JavaFrameAnchor* src) {
46 // In order to make sure the transition state is valid for "this"
47 // We must clear _last_Java_sp before copying the rest of the new data
48 //
49 // Hack Alert: Temporary bugfix for 4717480/4721647
50 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp
51 // unless the value is changing
52 //
53 if (_last_Java_sp != src->_last_Java_sp)
54 _last_Java_sp = NULL;
55
56 _last_Java_fp = src->_last_Java_fp;
57 _last_Java_pc = src->_last_Java_pc;
58 // Must be last so profiler will always see valid frame if has_last_frame() is true
59 _last_Java_sp = src->_last_Java_sp;
60 }
61
62 // Always walkable
63 bool walkable(void) { return true; }
64 // Never any thing to do since we are always walkable and can find address of return addresses
65 void make_walkable(JavaThread* thread) { }
66
67 intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
68
69 private:
70
71 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
72
73 public:
74
75 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
76
77 intptr_t* last_Java_fp(void) { return _last_Java_fp; }
78 // Assert (last_Java_sp == NULL || fp == NULL)
79 void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }