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src/cpu/zero/vm/bytes_zero.hpp@a9becfeecd1b (annotated)

src/cpu/zero/vm/bytes_zero.hpp

Wed, 22 Jan 2014 17:42:23 -0800

author

kvn

date

Wed, 22 Jan 2014 17:42:23 -0800

changeset 6503

a9becfeecd1b

parent 3156

f08d439fab8c

child 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

never@1445	1	/*
stefank@2314	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
never@1445	3	* Copyright 2007, 2008, 2009 Red Hat, Inc.
never@1445	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@1445	5	*
never@1445	6	* This code is free software; you can redistribute it and/or modify it
never@1445	7	* under the terms of the GNU General Public License version 2 only, as
never@1445	8	* published by the Free Software Foundation.
never@1445	9	*
never@1445	10	* This code is distributed in the hope that it will be useful, but WITHOUT
never@1445	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@1445	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@1445	13	* version 2 for more details (a copy is included in the LICENSE file that
never@1445	14	* accompanied this code).
never@1445	15	*
never@1445	16	* You should have received a copy of the GNU General Public License version
never@1445	17	* 2 along with this work; if not, write to the Free Software Foundation,
never@1445	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@1445	19	*
trims@1907	20	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	21	* or visit www.oracle.com if you need additional information or have any
trims@1907	22	* questions.
never@1445	23	*
never@1445	24	*/
never@1445	25
stefank@2314	26	#ifndef CPU_ZERO_VM_BYTES_ZERO_HPP
stefank@2314	27	#define CPU_ZERO_VM_BYTES_ZERO_HPP
stefank@2314	28
stefank@2314	29	#include "memory/allocation.hpp"
stefank@2314	30
never@1445	31	typedef union unaligned {
never@1445	32	u4 u;
never@1445	33	u2 us;
never@1445	34	u8 ul;
never@1445	35	} __attribute__((packed)) unaligned;
never@1445	36
never@1445	37	class Bytes: AllStatic {
never@1445	38	public:
never@1445	39	// Returns true if the byte ordering used by Java is different
never@1445	40	// from the native byte ordering of the underlying machine.
never@1445	41	static inline bool is_Java_byte_ordering_different() {
never@1445	42	#ifdef VM_LITTLE_ENDIAN
never@1445	43	return true;
never@1445	44	#else
never@1445	45	return false;
never@1445	46	#endif
never@1445	47	}
never@1445	48
never@1445	49	// Efficient reading and writing of unaligned unsigned data in
never@1445	50	// platform-specific byte ordering.
never@1445	51	static inline u2 get_native_u2(address p){
never@1445	52	unaligned *up = (unaligned *) p;
never@1445	53	return up->us;
never@1445	54	}
never@1445	55
never@1445	56	static inline u4 get_native_u4(address p) {
never@1445	57	unaligned *up = (unaligned *) p;
never@1445	58	return up->u;
never@1445	59	}
never@1445	60
never@1445	61	static inline u8 get_native_u8(address p) {
never@1445	62	unaligned *up = (unaligned *) p;
never@1445	63	return up->ul;
never@1445	64	}
never@1445	65
never@1445	66	static inline void put_native_u2(address p, u2 x) {
never@1445	67	unaligned *up = (unaligned *) p;
never@1445	68	up->us = x;
never@1445	69	}
never@1445	70
never@1445	71	static inline void put_native_u4(address p, u4 x) {
never@1445	72	unaligned *up = (unaligned *) p;
never@1445	73	up->u = x;
never@1445	74	}
never@1445	75
never@1445	76	static inline void put_native_u8(address p, u8 x) {
never@1445	77	unaligned *up = (unaligned *) p;
never@1445	78	up->ul = x;
never@1445	79	}
never@1445	80
never@1445	81	// Efficient reading and writing of unaligned unsigned data in Java
never@1445	82	// byte ordering (i.e. big-endian ordering).
never@1445	83	#ifdef VM_LITTLE_ENDIAN
never@1445	84	// Byte-order reversal is needed
never@1445	85	static inline u2 get_Java_u2(address p) {
never@1445	86	return (u2(p[0]) << 8) |
never@1445	87	(u2(p[1]) );
never@1445	88	}
never@1445	89	static inline u4 get_Java_u4(address p) {
never@1445	90	return (u4(p[0]) << 24) |
never@1445	91	(u4(p[1]) << 16) |
never@1445	92	(u4(p[2]) << 8) |
never@1445	93	(u4(p[3]) );
never@1445	94	}
never@1445	95	static inline u8 get_Java_u8(address p) {
never@1445	96	u4 hi, lo;
never@1445	97	hi = (u4(p[0]) << 24) |
never@1445	98	(u4(p[1]) << 16) |
never@1445	99	(u4(p[2]) << 8) |
never@1445	100	(u4(p[3]) );
never@1445	101	lo = (u4(p[4]) << 24) |
never@1445	102	(u4(p[5]) << 16) |
never@1445	103	(u4(p[6]) << 8) |
never@1445	104	(u4(p[7]) );
never@1445	105	return u8(lo) | (u8(hi) << 32);
never@1445	106	}
never@1445	107
never@1445	108	static inline void put_Java_u2(address p, u2 x) {
never@1445	109	p[0] = x >> 8;
never@1445	110	p[1] = x;
never@1445	111	}
never@1445	112	static inline void put_Java_u4(address p, u4 x) {
never@1445	113	p[0] = x >> 24;
never@1445	114	p[1] = x >> 16;
never@1445	115	p[2] = x >> 8;
never@1445	116	p[3] = x;
never@1445	117	}
never@1445	118	static inline void put_Java_u8(address p, u8 x) {
never@1445	119	u4 hi, lo;
never@1445	120	lo = x;
never@1445	121	hi = x >> 32;
never@1445	122	p[0] = hi >> 24;
never@1445	123	p[1] = hi >> 16;
never@1445	124	p[2] = hi >> 8;
never@1445	125	p[3] = hi;
never@1445	126	p[4] = lo >> 24;
never@1445	127	p[5] = lo >> 16;
never@1445	128	p[6] = lo >> 8;
never@1445	129	p[7] = lo;
never@1445	130	}
never@1445	131
never@1445	132	// Efficient swapping of byte ordering
never@1445	133	static inline u2 swap_u2(u2 x);
never@1445	134	static inline u4 swap_u4(u4 x);
never@1445	135	static inline u8 swap_u8(u8 x);
never@1445	136	#else
never@1445	137	// No byte-order reversal is needed
never@1445	138	static inline u2 get_Java_u2(address p) {
never@1445	139	return get_native_u2(p);
never@1445	140	}
never@1445	141	static inline u4 get_Java_u4(address p) {
never@1445	142	return get_native_u4(p);
never@1445	143	}
never@1445	144	static inline u8 get_Java_u8(address p) {
never@1445	145	return get_native_u8(p);
never@1445	146	}
never@1445	147
never@1445	148	static inline void put_Java_u2(address p, u2 x) {
never@1445	149	put_native_u2(p, x);
never@1445	150	}
never@1445	151	static inline void put_Java_u4(address p, u4 x) {
never@1445	152	put_native_u4(p, x);
never@1445	153	}
never@1445	154	static inline void put_Java_u8(address p, u8 x) {
never@1445	155	put_native_u8(p, x);
never@1445	156	}
never@1445	157
never@1445	158	// No byte-order reversal is needed
never@1445	159	static inline u2 swap_u2(u2 x) { return x; }
never@1445	160	static inline u4 swap_u4(u4 x) { return x; }
never@1445	161	static inline u8 swap_u8(u8 x) { return x; }
never@1445	162	#endif // VM_LITTLE_ENDIAN
never@1445	163	};
never@1445	164
never@1445	165	#ifdef VM_LITTLE_ENDIAN
never@1445	166	// The following header contains the implementations of swap_u2,
never@1445	167	// swap_u4, and swap_u8
stefank@2314	168	#ifdef TARGET_OS_ARCH_linux_zero
stefank@2314	169	# include "bytes_linux_zero.inline.hpp"
stefank@2314	170	#endif
never@3156	171	#ifdef TARGET_OS_ARCH_bsd_zero
never@3156	172	# include "bytes_bsd_zero.inline.hpp"
never@3156	173	#endif
stefank@2314	174
never@1445	175	#endif // VM_LITTLE_ENDIAN
stefank@2314	176
stefank@2314	177	#endif // CPU_ZERO_VM_BYTES_ZERO_HPP