Mercurial > hg > truffle
view src/share/vm/oops/klass.inline.hpp @ 21863:f4822d122041 jdk8u45-b11
Merge
author | asaha |
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date | Sat, 07 Mar 2015 16:26:10 -0800 |
parents | 78bbf4d43a14 |
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/* * Copyright (c) 2005, 2014, 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() || oop_is_instance(), "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), err_msg("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