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Java example source code file (bytes_x86.hpp)
The bytes_x86.hpp Java example source code/* * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 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_X86_VM_BYTES_X86_HPP #define CPU_X86_VM_BYTES_X86_HPP #include "memory/allocation.hpp" 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] #ifdef TARGET_OS_ARCH_linux_x86 # include "bytes_linux_x86.inline.hpp" #endif #ifdef TARGET_OS_ARCH_solaris_x86 # include "bytes_solaris_x86.inline.hpp" #endif #ifdef TARGET_OS_ARCH_windows_x86 # include "bytes_windows_x86.inline.hpp" #endif #ifdef TARGET_OS_ARCH_bsd_x86 # include "bytes_bsd_x86.inline.hpp" #endif #endif // CPU_X86_VM_BYTES_X86_HPP Other Java examples (source code examples)Here is a short list of links related to this Java bytes_x86.hpp source code file: |
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