| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_OOPS_KLASS_INLINE_HPP |
| #define SHARE_VM_OOPS_KLASS_INLINE_HPP |
| |
| #include "memory/universe.hpp" |
| #include "oops/klass.hpp" |
| #include "oops/markOop.hpp" |
| |
| inline void Klass::set_prototype_header(markOop header) { |
| assert(!header->has_bias_pattern() || is_instance_klass(), "biased locking currently only supported for Java instances"); |
| _prototype_header = header; |
| } |
| |
| inline bool Klass::is_null(Klass* obj) { return obj == NULL; } |
| inline bool Klass::is_null(narrowKlass obj) { return obj == 0; } |
| |
| // Encoding and decoding for klass field. |
| |
| inline bool check_klass_alignment(Klass* obj) { |
| return (intptr_t)obj % KlassAlignmentInBytes == 0; |
| } |
| |
| inline narrowKlass Klass::encode_klass_not_null(Klass* v) { |
| assert(!is_null(v), "klass value can never be zero"); |
| assert(check_klass_alignment(v), "Address not aligned"); |
| int shift = Universe::narrow_klass_shift(); |
| uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1)); |
| assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding"); |
| uint64_t result = pd >> shift; |
| assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow"); |
| assert(decode_klass(result) == v, "reversibility"); |
| return (narrowKlass)result; |
| } |
| |
| inline narrowKlass Klass::encode_klass(Klass* v) { |
| return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v); |
| } |
| |
| inline Klass* Klass::decode_klass_not_null(narrowKlass v) { |
| assert(!is_null(v), "narrow klass value can never be zero"); |
| int shift = Universe::narrow_klass_shift(); |
| Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift)); |
| assert(check_klass_alignment(result), "address not aligned: " INTPTR_FORMAT, p2i((void*) result)); |
| return result; |
| } |
| |
| inline Klass* Klass::decode_klass(narrowKlass v) { |
| return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v); |
| } |
| |
| #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP |