1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/x86/vm/bytes_x86.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,89 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef CPU_X86_VM_BYTES_X86_HPP
1.29 +#define CPU_X86_VM_BYTES_X86_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +
1.33 +class Bytes: AllStatic {
1.34 + private:
1.35 +#ifndef AMD64
1.36 + // Helper function for swap_u8
1.37 + static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation
1.38 +#endif // AMD64
1.39 +
1.40 + public:
1.41 + // Returns true if the byte ordering used by Java is different from the native byte ordering
1.42 + // of the underlying machine. For example, this is true for Intel x86, but false for Solaris
1.43 + // on Sparc.
1.44 + static inline bool is_Java_byte_ordering_different(){ return true; }
1.45 +
1.46 +
1.47 + // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
1.48 + // (no special code is needed since x86 CPUs can access unaligned data)
1.49 + static inline u2 get_native_u2(address p) { return *(u2*)p; }
1.50 + static inline u4 get_native_u4(address p) { return *(u4*)p; }
1.51 + static inline u8 get_native_u8(address p) { return *(u8*)p; }
1.52 +
1.53 + static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; }
1.54 + static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
1.55 + static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
1.56 +
1.57 +
1.58 + // Efficient reading and writing of unaligned unsigned data in Java
1.59 + // byte ordering (i.e. big-endian ordering). Byte-order reversal is
1.60 + // needed since x86 CPUs use little-endian format.
1.61 + static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); }
1.62 + static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); }
1.63 + static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); }
1.64 +
1.65 + static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); }
1.66 + static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); }
1.67 + static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); }
1.68 +
1.69 +
1.70 + // Efficient swapping of byte ordering
1.71 + static inline u2 swap_u2(u2 x); // compiler-dependent implementation
1.72 + static inline u4 swap_u4(u4 x); // compiler-dependent implementation
1.73 + static inline u8 swap_u8(u8 x);
1.74 +};
1.75 +
1.76 +
1.77 +// The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
1.78 +#ifdef TARGET_OS_ARCH_linux_x86
1.79 +# include "bytes_linux_x86.inline.hpp"
1.80 +#endif
1.81 +#ifdef TARGET_OS_ARCH_solaris_x86
1.82 +# include "bytes_solaris_x86.inline.hpp"
1.83 +#endif
1.84 +#ifdef TARGET_OS_ARCH_windows_x86
1.85 +# include "bytes_windows_x86.inline.hpp"
1.86 +#endif
1.87 +#ifdef TARGET_OS_ARCH_bsd_x86
1.88 +# include "bytes_bsd_x86.inline.hpp"
1.89 +#endif
1.90 +
1.91 +
1.92 +#endif // CPU_X86_VM_BYTES_X86_HPP
