| /* |
| * Copyright 1997-2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| class Bytes: AllStatic { |
| private: |
| #ifndef AMD64 |
| // Helper function for swap_u8 |
| static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation |
| #endif // AMD64 |
| |
| public: |
| // Returns true if the byte ordering used by Java is different from the native byte ordering |
| // of the underlying machine. For example, this is true for Intel x86, but false for Solaris |
| // on Sparc. |
| static inline bool is_Java_byte_ordering_different(){ return true; } |
| |
| |
| // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering |
| // (no special code is needed since x86 CPUs can access unaligned data) |
| static inline u2 get_native_u2(address p) { return *(u2*)p; } |
| static inline u4 get_native_u4(address p) { return *(u4*)p; } |
| static inline u8 get_native_u8(address p) { return *(u8*)p; } |
| |
| static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; } |
| static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; } |
| static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; } |
| |
| |
| // Efficient reading and writing of unaligned unsigned data in Java |
| // byte ordering (i.e. big-endian ordering). Byte-order reversal is |
| // needed since x86 CPUs use little-endian format. |
| static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); } |
| static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); } |
| static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); } |
| |
| static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); } |
| static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); } |
| static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); } |
| |
| |
| // Efficient swapping of byte ordering |
| static inline u2 swap_u2(u2 x); // compiler-dependent implementation |
| static inline u4 swap_u4(u4 x); // compiler-dependent implementation |
| static inline u8 swap_u8(u8 x); |
| }; |
| |
| |
| // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base] |
| #include "incls/_bytes_pd.inline.hpp.incl" |
