Co-authored-by: Greg Lewis <glewis@eyesbeyond.com> Co-authored-by: Jung-uk Kim <jkim@freebsd.org> Co-authored-by: Christos Zoulas <christos@zoulas.com> Co-authored-by: Landon Fuller <landonf@plausible.coop> Co-authored-by: The FreeBSD Foundation <board@freebsdfoundation.org> Co-authored-by: Michael Franz <mvfranz@gmail.com> Co-authored-by: Roger Hoover <rhoover@apple.com> Co-authored-by: Alexander Strange <astrange@apple.com> Reviewed-by: kvn, twisti, jrose
90 lines
3.6 KiB
C++
90 lines
3.6 KiB
C++
/*
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef CPU_X86_VM_BYTES_X86_HPP
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#define CPU_X86_VM_BYTES_X86_HPP
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#include "memory/allocation.hpp"
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class Bytes: AllStatic {
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private:
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#ifndef AMD64
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// Helper function for swap_u8
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static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation
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#endif // AMD64
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public:
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// Returns true if the byte ordering used by Java is different from the native byte ordering
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// of the underlying machine. For example, this is true for Intel x86, but false for Solaris
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// on Sparc.
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static inline bool is_Java_byte_ordering_different(){ return true; }
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// Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
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// (no special code is needed since x86 CPUs can access unaligned data)
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static inline u2 get_native_u2(address p) { return *(u2*)p; }
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static inline u4 get_native_u4(address p) { return *(u4*)p; }
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static inline u8 get_native_u8(address p) { return *(u8*)p; }
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static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; }
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static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
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static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
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// Efficient reading and writing of unaligned unsigned data in Java
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// byte ordering (i.e. big-endian ordering). Byte-order reversal is
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// needed since x86 CPUs use little-endian format.
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static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); }
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static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); }
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static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); }
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static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); }
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static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); }
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static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); }
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// Efficient swapping of byte ordering
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static inline u2 swap_u2(u2 x); // compiler-dependent implementation
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static inline u4 swap_u4(u4 x); // compiler-dependent implementation
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static inline u8 swap_u8(u8 x);
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};
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// The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
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#ifdef TARGET_OS_ARCH_linux_x86
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# include "bytes_linux_x86.inline.hpp"
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#endif
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#ifdef TARGET_OS_ARCH_solaris_x86
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# include "bytes_solaris_x86.inline.hpp"
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#endif
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#ifdef TARGET_OS_ARCH_windows_x86
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# include "bytes_windows_x86.inline.hpp"
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#endif
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#ifdef TARGET_OS_ARCH_bsd_x86
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# include "bytes_bsd_x86.inline.hpp"
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#endif
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#endif // CPU_X86_VM_BYTES_X86_HPP
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