duke@435: /*
hseigel@5528:  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_OOPS_KLASS_INLINE_HPP
stefank@2314: #define SHARE_VM_OOPS_KLASS_INLINE_HPP
stefank@2314: 
hseigel@5528: #include "memory/universe.hpp"
stefank@2314: #include "oops/klass.hpp"
stefank@2314: #include "oops/markOop.hpp"
stefank@2314: 
duke@435: inline void Klass::set_prototype_header(markOop header) {
duke@435:   assert(!header->has_bias_pattern() || oop_is_instance(), "biased locking currently only supported for Java instances");
duke@435:   _prototype_header = header;
duke@435: }
stefank@2314: 
hseigel@5528: inline bool Klass::is_null(Klass* obj)  { return obj == NULL; }
hseigel@5528: inline bool Klass::is_null(narrowKlass obj) { return obj == 0; }
hseigel@5528: 
hseigel@5528: // Encoding and decoding for klass field.
hseigel@5528: 
hseigel@5528: inline bool check_klass_alignment(Klass* obj) {
hseigel@5528:   return (intptr_t)obj % KlassAlignmentInBytes == 0;
hseigel@5528: }
hseigel@5528: 
hseigel@5528: inline narrowKlass Klass::encode_klass_not_null(Klass* v) {
hseigel@5528:   assert(!is_null(v), "klass value can never be zero");
hseigel@5528:   assert(check_klass_alignment(v), "Address not aligned");
hseigel@5528:   int    shift = Universe::narrow_klass_shift();
hseigel@5528:   uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1));
hseigel@5528:   assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
hseigel@5528:   uint64_t result = pd >> shift;
hseigel@5528:   assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
hseigel@5528:   assert(decode_klass(result) == v, "reversibility");
hseigel@5528:   return (narrowKlass)result;
hseigel@5528: }
hseigel@5528: 
hseigel@5528: inline narrowKlass Klass::encode_klass(Klass* v) {
hseigel@5528:   return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v);
hseigel@5528: }
hseigel@5528: 
hseigel@5528: inline Klass* Klass::decode_klass_not_null(narrowKlass v) {
hseigel@5528:   assert(!is_null(v), "narrow klass value can never be zero");
hseigel@5528:   int    shift = Universe::narrow_klass_shift();
hseigel@5528:   Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift));
hseigel@5528:   assert(check_klass_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result));
hseigel@5528:   return result;
hseigel@5528: }
hseigel@5528: 
hseigel@5528: inline Klass* Klass::decode_klass(narrowKlass v) {
hseigel@5528:   return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v);
hseigel@5528: }
hseigel@5528: 
stefank@2314: #endif // SHARE_VM_OOPS_KLASS_INLINE_HPP