diff -r ede6e8912b79 -r 151845b8bd85 hotspot/src/share/vm/utilities/endian.hpp --- a/hotspot/src/share/vm/utilities/endian.hpp Fri Sep 18 14:20:00 2015 -0700 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,119 +0,0 @@ -/* - * Copyright (c) 2015, 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 SHARE_VM_UTILITIES_ENDIAN_HPP -#define SHARE_VM_UTILITIES_ENDIAN_HPP - -#include "utilities/globalDefinitions.hpp" - -// Selectable endian handling. Endian handlers are used when accessing values -// that are of unknown (until runtime) endian. The only requirement of the values -// accessed are that they are aligned to proper size boundaries (no misalignment.) -// To select an endian handler, one should call Endian::get_handler(big_endian); -// Where big_endian is true if big endian is required and false otherwise. The -// native endian handler can be fetched with Endian::get_native_handler(); -// To retrieve a value using the approprate endian, use one of the overloaded -// calls to get. To set a value, then use one of the overloaded set calls. -// Ex. -// s4 value; // Imported value; -// ... -// Endian* endian = Endian::get_handler(true); // Use big endian -// s4 corrected = endian->get(value); -// endian->set(value, 1); -// -class Endian { -public: - virtual u2 get(u2 x) = 0; - virtual u4 get(u4 x) = 0; - virtual u8 get(u8 x) = 0; - virtual s2 get(s2 x) = 0; - virtual s4 get(s4 x) = 0; - virtual s8 get(s8 x) = 0; - - virtual void set(u2& x, u2 y) = 0; - virtual void set(u4& x, u4 y) = 0; - virtual void set(u8& x, u8 y) = 0; - virtual void set(s2& x, s2 y) = 0; - virtual void set(s4& x, s4 y) = 0; - virtual void set(s8& x, s8 y) = 0; - - // Quick little endian test. - static bool is_little_endian() { u4 x = 1; return *(u1 *)&x != 0; } - - // Quick big endian test. - static bool is_big_endian() { return !is_little_endian(); } - - // Select an appropriate endian handler. - static Endian* get_handler(bool big_endian); - - // Return the native endian handler. - static Endian* get_native_handler(); -}; - -// Normal endian handling. -class NativeEndian : public Endian { -private: - static NativeEndian _native; - -public: - u2 get(u2 x); - u4 get(u4 x); - u8 get(u8 x); - s2 get(s2 x); - s4 get(s4 x); - s8 get(s8 x); - - void set(u2& x, u2 y); - void set(u4& x, u4 y); - void set(u8& x, u8 y); - void set(s2& x, s2 y); - void set(s4& x, s4 y); - void set(s8& x, s8 y); - - static Endian* get_native() { return &_native; } -}; - -// Swapping endian handling. -class SwappingEndian : public Endian { -private: - static SwappingEndian _swapping; - -public: - u2 get(u2 x); - u4 get(u4 x); - u8 get(u8 x); - s2 get(s2 x); - s4 get(s4 x); - s8 get(s8 x); - - void set(u2& x, u2 y); - void set(u4& x, u4 y); - void set(u8& x, u8 y); - void set(s2& x, s2 y); - void set(s4& x, s4 y); - void set(s8& x, s8 y); - - static Endian* get_swapping() { return &_swapping; } -}; -#endif // SHARE_VM_UTILITIES_ENDIAN_HPP