accessFlags.cpp revision 7249:f1821f27f91c 
1/*
2 * Copyright (c) 1997, 2014, 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.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "oops/oop.inline.hpp"
27#include "runtime/atomic.inline.hpp"
28#include "utilities/accessFlags.hpp"
29
30void AccessFlags::atomic_set_bits(jint bits) {
31  // Atomically update the flags with the bits given
32  jint old_flags, new_flags, f;
33  do {
34    old_flags = _flags;
35    new_flags = old_flags | bits;
36    f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
37  } while(f != old_flags);
38}
39
40void AccessFlags::atomic_clear_bits(jint bits) {
41  // Atomically update the flags with the bits given
42  jint old_flags, new_flags, f;
43  do {
44    old_flags = _flags;
45    new_flags = old_flags & ~bits;
46    f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
47  } while(f != old_flags);
48}
49
50// Returns true iff this thread succeeded setting the bit.
51bool AccessFlags::atomic_set_one_bit(jint bit) {
52  // Atomically update the flags with the bit given
53  jint old_flags, new_flags, f;
54  bool is_setting_bit = false;
55  do {
56    old_flags = _flags;
57    new_flags = old_flags | bit;
58    is_setting_bit = old_flags != new_flags;
59    f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
60  } while(f != old_flags);
61
62  return is_setting_bit;
63}
64
65#if !defined(PRODUCT) || INCLUDE_JVMTI
66
67void AccessFlags::print_on(outputStream* st) const {
68  if (is_public      ()) st->print("public "      );
69  if (is_private     ()) st->print("private "     );
70  if (is_protected   ()) st->print("protected "   );
71  if (is_static      ()) st->print("static "      );
72  if (is_final       ()) st->print("final "       );
73  if (is_synchronized()) st->print("synchronized ");
74  if (is_volatile    ()) st->print("volatile "    );
75  if (is_transient   ()) st->print("transient "   );
76  if (is_native      ()) st->print("native "      );
77  if (is_interface   ()) st->print("interface "   );
78  if (is_abstract    ()) st->print("abstract "    );
79  if (is_strict      ()) st->print("strict "      );
80  if (is_synthetic   ()) st->print("synthetic "   );
81  if (is_old         ()) st->print("{old} "       );
82  if (is_obsolete    ()) st->print("{obsolete} "  );
83  if (on_stack       ()) st->print("{on_stack} "  );
84}
85
86#endif // !PRODUCT || INCLUDE_JVMTI
87
88void accessFlags_init() {
89  assert(sizeof(AccessFlags) == sizeof(jint), "just checking size of flags");
90}
91