154a1a02bf
Use script and some manual fixup to fix directores names in include guards. Reviewed-by: lfoltan, eosterlund, kbarrett
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/*
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* Copyright (c) 1997, 2019, 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_BYTES_X86_HPP
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#define CPU_X86_BYTES_X86_HPP
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#include "memory/allocation.hpp"
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#include "utilities/align.hpp"
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#include "utilities/macros.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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// Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
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template <typename T>
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static inline T get_native(const void* p) {
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assert(p != NULL, "null pointer");
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T x;
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if (is_aligned(p, sizeof(T))) {
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x = *(T*)p;
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} else {
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memcpy(&x, p, sizeof(T));
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}
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return x;
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}
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template <typename T>
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static inline void put_native(void* p, T x) {
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assert(p != NULL, "null pointer");
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if (is_aligned(p, sizeof(T))) {
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*(T*)p = x;
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} else {
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memcpy(p, &x, sizeof(T));
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}
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}
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static inline u2 get_native_u2(address p) { return get_native<u2>((void*)p); }
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static inline u4 get_native_u4(address p) { return get_native<u4>((void*)p); }
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static inline u8 get_native_u8(address p) { return get_native<u8>((void*)p); }
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static inline void put_native_u2(address p, u2 x) { put_native<u2>((void*)p, x); }
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static inline void put_native_u4(address p, u4 x) { put_native<u4>((void*)p, x); }
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static inline void put_native_u8(address p, u8 x) { put_native<u8>((void*)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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template <typename T>
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static inline T get_Java(const address p) {
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T x = get_native<T>(p);
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if (Endian::is_Java_byte_ordering_different()) {
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x = swap<T>(x);
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}
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return x;
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}
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template <typename T>
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static inline void put_Java(address p, T x) {
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if (Endian::is_Java_byte_ordering_different()) {
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x = swap<T>(x);
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}
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put_native<T>(p, x);
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}
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static inline u2 get_Java_u2(address p) { return get_Java<u2>(p); }
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static inline u4 get_Java_u4(address p) { return get_Java<u4>(p); }
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static inline u8 get_Java_u8(address p) { return get_Java<u8>(p); }
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static inline void put_Java_u2(address p, u2 x) { put_Java<u2>(p, x); }
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static inline void put_Java_u4(address p, u4 x) { put_Java<u4>(p, x); }
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static inline void put_Java_u8(address p, u8 x) { put_Java<u8>(p, x); }
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// Efficient swapping of byte ordering
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template <typename T>
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static T swap(T x) {
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switch (sizeof(T)) {
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case sizeof(u1): return x;
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case sizeof(u2): return swap_u2(x);
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case sizeof(u4): return swap_u4(x);
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case sizeof(u8): return swap_u8(x);
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default:
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guarantee(false, "invalid size: " SIZE_FORMAT "\n", sizeof(T));
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return 0;
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}
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}
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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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#include OS_CPU_HEADER_INLINE(bytes)
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#endif // CPU_X86_BYTES_X86_HPP
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