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/*
* Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.
* Copyright 2007, 2008, 2009 Red Hat, Inc.
* 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.
*
*/
typedef union unaligned {
u4 u;
u2 us;
u8 ul;
} __attribute__((packed)) unaligned;
class Bytes: AllStatic {
public:
// Returns true if the byte ordering used by Java is different
// from the native byte ordering of the underlying machine.
static inline bool is_Java_byte_ordering_different() {
#ifdef VM_LITTLE_ENDIAN
return true;
#else
return false;
#endif
}
// Efficient reading and writing of unaligned unsigned data in
// platform-specific byte ordering.
static inline u2 get_native_u2(address p){
unaligned *up = (unaligned *) p;
return up->us;
}
static inline u4 get_native_u4(address p) {
unaligned *up = (unaligned *) p;
return up->u;
}
static inline u8 get_native_u8(address p) {
unaligned *up = (unaligned *) p;
return up->ul;
}
static inline void put_native_u2(address p, u2 x) {
unaligned *up = (unaligned *) p;
up->us = x;
}
static inline void put_native_u4(address p, u4 x) {
unaligned *up = (unaligned *) p;
up->u = x;
}
static inline void put_native_u8(address p, u8 x) {
unaligned *up = (unaligned *) p;
up->ul = x;
}
// Efficient reading and writing of unaligned unsigned data in Java
// byte ordering (i.e. big-endian ordering).
#ifdef VM_LITTLE_ENDIAN
// Byte-order reversal is needed
static inline u2 get_Java_u2(address p) {
return (u2(p[0]) << 8) |
(u2(p[1]) );
}
static inline u4 get_Java_u4(address p) {
return (u4(p[0]) << 24) |
(u4(p[1]) << 16) |
(u4(p[2]) << 8) |
(u4(p[3]) );
}
static inline u8 get_Java_u8(address p) {
u4 hi, lo;
hi = (u4(p[0]) << 24) |
(u4(p[1]) << 16) |
(u4(p[2]) << 8) |
(u4(p[3]) );
lo = (u4(p[4]) << 24) |
(u4(p[5]) << 16) |
(u4(p[6]) << 8) |
(u4(p[7]) );
return u8(lo) | (u8(hi) << 32);
}
static inline void put_Java_u2(address p, u2 x) {
p[0] = x >> 8;
p[1] = x;
}
static inline void put_Java_u4(address p, u4 x) {
p[0] = x >> 24;
p[1] = x >> 16;
p[2] = x >> 8;
p[3] = x;
}
static inline void put_Java_u8(address p, u8 x) {
u4 hi, lo;
lo = x;
hi = x >> 32;
p[0] = hi >> 24;
p[1] = hi >> 16;
p[2] = hi >> 8;
p[3] = hi;
p[4] = lo >> 24;
p[5] = lo >> 16;
p[6] = lo >> 8;
p[7] = lo;
}
// Efficient swapping of byte ordering
static inline u2 swap_u2(u2 x);
static inline u4 swap_u4(u4 x);
static inline u8 swap_u8(u8 x);
#else
// No byte-order reversal is needed
static inline u2 get_Java_u2(address p) {
return get_native_u2(p);
}
static inline u4 get_Java_u4(address p) {
return get_native_u4(p);
}
static inline u8 get_Java_u8(address p) {
return get_native_u8(p);
}
static inline void put_Java_u2(address p, u2 x) {
put_native_u2(p, x);
}
static inline void put_Java_u4(address p, u4 x) {
put_native_u4(p, x);
}
static inline void put_Java_u8(address p, u8 x) {
put_native_u8(p, x);
}
// No byte-order reversal is needed
static inline u2 swap_u2(u2 x) { return x; }
static inline u4 swap_u4(u4 x) { return x; }
static inline u8 swap_u8(u8 x) { return x; }
#endif // VM_LITTLE_ENDIAN
};
#ifdef VM_LITTLE_ENDIAN
// The following header contains the implementations of swap_u2,
// swap_u4, and swap_u8
#include "incls/_bytes_pd.inline.hpp.incl"
#endif // VM_LITTLE_ENDIAN
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