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src/share/vm/oops/klass.inline.hpp@8c95980d0b66 (annotated)

src/share/vm/oops/klass.inline.hpp

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 10026

8c95980d0b66

parent 6876

710a3c8b516e

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_OOPS_KLASS_INLINE_HPP
aoqi@0	26	#define SHARE_VM_OOPS_KLASS_INLINE_HPP
aoqi@0	27
aoqi@0	28	#include "memory/universe.hpp"
aoqi@0	29	#include "oops/klass.hpp"
aoqi@0	30	#include "oops/markOop.hpp"
aoqi@0	31
aoqi@0	32	inline void Klass::set_prototype_header(markOop header) {
aoqi@0	33	assert(!header->has_bias_pattern() || oop_is_instance(), "biased locking currently only supported for Java instances");
aoqi@0	34	_prototype_header = header;
aoqi@0	35	}
aoqi@0	36
aoqi@0	37	inline bool Klass::is_null(Klass* obj) { return obj == NULL; }
aoqi@0	38	inline bool Klass::is_null(narrowKlass obj) { return obj == 0; }
aoqi@0	39
aoqi@0	40	// Encoding and decoding for klass field.
aoqi@0	41
aoqi@0	42	inline bool check_klass_alignment(Klass* obj) {
aoqi@0	43	return (intptr_t)obj % KlassAlignmentInBytes == 0;
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	inline narrowKlass Klass::encode_klass_not_null(Klass* v) {
aoqi@0	47	assert(!is_null(v), "klass value can never be zero");
aoqi@0	48	assert(check_klass_alignment(v), "Address not aligned");
aoqi@0	49	int shift = Universe::narrow_klass_shift();
aoqi@0	50	uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1));
aoqi@0	51	assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
aoqi@0	52	uint64_t result = pd >> shift;
aoqi@0	53	assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
aoqi@0	54	assert(decode_klass(result) == v, "reversibility");
aoqi@0	55	return (narrowKlass)result;
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	inline narrowKlass Klass::encode_klass(Klass* v) {
aoqi@0	59	return is_null(v) ? (narrowKlass)0 : encode_klass_not_null(v);
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	inline Klass* Klass::decode_klass_not_null(narrowKlass v) {
aoqi@0	63	assert(!is_null(v), "narrow klass value can never be zero");
aoqi@0	64	int shift = Universe::narrow_klass_shift();
aoqi@0	65	Klass* result = (Klass*)(void*)((uintptr_t)Universe::narrow_klass_base() + ((uintptr_t)v << shift));
aoqi@0	66	assert(check_klass_alignment(result), err_msg("address not aligned: " INTPTR_FORMAT, p2i((void*) result)));
aoqi@0	67	return result;
aoqi@0	68	}
aoqi@0	69
aoqi@0	70	inline Klass* Klass::decode_klass(narrowKlass v) {
aoqi@0	71	return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v);
aoqi@0	72	}
aoqi@0	73
aoqi@0	74	#endif // SHARE_VM_OOPS_KLASS_INLINE_HPP