| /* |
| * Copyright (c) 1997, 2010, 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. |
| * |
| */ |
| |
| #ifndef CPU_ZERO_VM_BYTES_ZERO_HPP |
| #define CPU_ZERO_VM_BYTES_ZERO_HPP |
| |
| #include "memory/allocation.hpp" |
| |
| 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 |
| #ifdef TARGET_OS_ARCH_linux_zero |
| # include "bytes_linux_zero.inline.hpp" |
| #endif |
| |
| #endif // VM_LITTLE_ENDIAN |
| |
| #endif // CPU_ZERO_VM_BYTES_ZERO_HPP |