duke@435: /*
stefank@2314:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef CPU_X86_VM_BYTES_X86_HPP
stefank@2314: #define CPU_X86_VM_BYTES_X86_HPP
stefank@2314: 
stefank@2314: #include "memory/allocation.hpp"
stefank@2314: 
duke@435: class Bytes: AllStatic {
duke@435:  private:
duke@435: #ifndef AMD64
duke@435:   // Helper function for swap_u8
duke@435:   static inline u8   swap_u8_base(u4 x, u4 y);        // compiler-dependent implementation
duke@435: #endif // AMD64
duke@435: 
duke@435:  public:
duke@435:   // Returns true if the byte ordering used by Java is different from the native byte ordering
duke@435:   // of the underlying machine. For example, this is true for Intel x86, but false for Solaris
duke@435:   // on Sparc.
duke@435:   static inline bool is_Java_byte_ordering_different(){ return true; }
duke@435: 
duke@435: 
duke@435:   // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
duke@435:   // (no special code is needed since x86 CPUs can access unaligned data)
duke@435:   static inline u2   get_native_u2(address p)         { return *(u2*)p; }
duke@435:   static inline u4   get_native_u4(address p)         { return *(u4*)p; }
duke@435:   static inline u8   get_native_u8(address p)         { return *(u8*)p; }
duke@435: 
duke@435:   static inline void put_native_u2(address p, u2 x)   { *(u2*)p = x; }
duke@435:   static inline void put_native_u4(address p, u4 x)   { *(u4*)p = x; }
duke@435:   static inline void put_native_u8(address p, u8 x)   { *(u8*)p = x; }
duke@435: 
duke@435: 
duke@435:   // Efficient reading and writing of unaligned unsigned data in Java
duke@435:   // byte ordering (i.e. big-endian ordering). Byte-order reversal is
duke@435:   // needed since x86 CPUs use little-endian format.
duke@435:   static inline u2   get_Java_u2(address p)           { return swap_u2(get_native_u2(p)); }
duke@435:   static inline u4   get_Java_u4(address p)           { return swap_u4(get_native_u4(p)); }
duke@435:   static inline u8   get_Java_u8(address p)           { return swap_u8(get_native_u8(p)); }
duke@435: 
duke@435:   static inline void put_Java_u2(address p, u2 x)     { put_native_u2(p, swap_u2(x)); }
duke@435:   static inline void put_Java_u4(address p, u4 x)     { put_native_u4(p, swap_u4(x)); }
duke@435:   static inline void put_Java_u8(address p, u8 x)     { put_native_u8(p, swap_u8(x)); }
duke@435: 
duke@435: 
duke@435:   // Efficient swapping of byte ordering
duke@435:   static inline u2   swap_u2(u2 x);                   // compiler-dependent implementation
duke@435:   static inline u4   swap_u4(u4 x);                   // compiler-dependent implementation
duke@435:   static inline u8   swap_u8(u8 x);
duke@435: };
duke@435: 
duke@435: 
duke@435: // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
stefank@2314: #ifdef TARGET_OS_ARCH_linux_x86
stefank@2314: # include "bytes_linux_x86.inline.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_solaris_x86
stefank@2314: # include "bytes_solaris_x86.inline.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_windows_x86
stefank@2314: # include "bytes_windows_x86.inline.hpp"
stefank@2314: #endif
never@3156: #ifdef TARGET_OS_ARCH_bsd_x86
never@3156: # include "bytes_bsd_x86.inline.hpp"
never@3156: #endif
stefank@2314: 
stefank@2314: 
stefank@2314: #endif // CPU_X86_VM_BYTES_X86_HPP