Mon, 11 Oct 2010 04:18:58 -0700
6829194: JSR 292 needs to support compressed oops
Reviewed-by: kvn, jrose
1 /*
2 * Copyright (c) 2002, 2005, 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.
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23 */
25 private:
26 volatile int _flags;
28 public:
30 enum pd_Constants {
31 flushed = 1 // winodows have flushed
32 };
34 int flags(void) { return _flags; }
35 void set_flags(int flags) { _flags = flags; }
37 static ByteSize flags_offset() { return byte_offset_of(JavaFrameAnchor, _flags); }
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)
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 }
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;
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 }
70 // Is stack walkable
71 inline bool walkable( void) {
72 return _flags & flushed;
73 }
75 void make_walkable(JavaThread* thread);
77 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
79 address last_Java_pc(void) { return _last_Java_pc; }
81 // These are only used by friends
82 private:
84 intptr_t* last_Java_sp() const {
85 // _last_Java_sp will always be a an unbiased stack pointer
86 // if is is biased then some setter screwed up. This is
87 // deadly.
88 #ifdef _LP64
89 assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
90 #endif
91 return _last_Java_sp;
92 }
94 void capture_last_Java_pc(intptr_t* sp);
96 void set_window_flushed( void) {
97 _flags |= flushed;
98 OrderAccess::fence();
99 }