Wed, 03 Sep 2014 09:25:44 +0200
Merge
1 /*
2 * Copyright (c) 2005, 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 */
25 #ifndef SHARE_VM_OOPS_KLASS_INLINE_HPP
26 #define SHARE_VM_OOPS_KLASS_INLINE_HPP
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
30 #include "oops/markOop.hpp"
32 inline void Klass::set_prototype_header(markOop header) {
33 assert(!header->has_bias_pattern() || oop_is_instance(), "biased locking currently only supported for Java instances");
34 _prototype_header = header;
35 }
37 inline bool Klass::is_null(Klass* obj) { return obj == NULL; }
38 inline bool Klass::is_null(narrowKlass obj) { return obj == 0; }
40 // Encoding and decoding for klass field.
42 inline bool check_klass_alignment(Klass* obj) {
43 return (intptr_t)obj % KlassAlignmentInBytes == 0;
44 }
46 inline narrowKlass Klass::encode_klass_not_null(Klass* v) {
47 assert(!is_null(v), "klass value can never be zero");
48 assert(check_klass_alignment(v), "Address not aligned");
49 int shift = Universe::narrow_klass_shift();
50 uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1));
51 assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
52 uint64_t result = pd >> shift;
53 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
54 assert(decode_klass(result) == v, "reversibility");
55 return (narrowKlass)result;
56 }
58 inline narrowKlass Klass::encode_klass(Klass* v) {
59 return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v);
60 }
62 inline Klass* Klass::decode_klass_not_null(narrowKlass v) {
63 assert(!is_null(v), "narrow klass value can never be zero");
64 int shift = Universe::narrow_klass_shift();
65 Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift));
66 assert(check_klass_alignment(result), err_msg("address not aligned: " INTPTR_FORMAT, p2i((void*) result)));
67 return result;
68 }
70 inline Klass* Klass::decode_klass(narrowKlass v) {
71 return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v);
72 }
74 #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP