Mercurial > hg > truffle
view src/cpu/zero/vm/bytes_zero.hpp @ 8604:1f83d8994b7a
unsafeCast: remove anchor node in NewObjectSnippets
as it is unnecessary due to the dependency to `result'.
also remove a javadoc tag in a comment
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Tue, 02 Apr 2013 14:08:26 +0200 |
parents | f08d439fab8c |
children |
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/* * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2007, 2008, 2009 Red Hat, Inc. * 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_ZERO_VM_BYTES_ZERO_HPP #define CPU_ZERO_VM_BYTES_ZERO_HPP #include "memory/allocation.hpp" typedef union unaligned { u4 u; u2 us; u8 ul; } __attribute__((packed)) unaligned; class Bytes: AllStatic { public: // Returns true if the byte ordering used by Java is different // from the native byte ordering of the underlying machine. static inline bool is_Java_byte_ordering_different() { #ifdef VM_LITTLE_ENDIAN return true; #else return false; #endif } // Efficient reading and writing of unaligned unsigned data in // platform-specific byte ordering. static inline u2 get_native_u2(address p){ unaligned *up = (unaligned *) p; return up->us; } static inline u4 get_native_u4(address p) { unaligned *up = (unaligned *) p; return up->u; } static inline u8 get_native_u8(address p) { unaligned *up = (unaligned *) p; return up->ul; } static inline void put_native_u2(address p, u2 x) { unaligned *up = (unaligned *) p; up->us = x; } static inline void put_native_u4(address p, u4 x) { unaligned *up = (unaligned *) p; up->u = x; } static inline void put_native_u8(address p, u8 x) { unaligned *up = (unaligned *) p; up->ul = x; } // Efficient reading and writing of unaligned unsigned data in Java // byte ordering (i.e. big-endian ordering). #ifdef VM_LITTLE_ENDIAN // Byte-order reversal is needed static inline u2 get_Java_u2(address p) { return (u2(p[0]) << 8) | (u2(p[1]) ); } static inline u4 get_Java_u4(address p) { return (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | (u4(p[3]) ); } static inline u8 get_Java_u8(address p) { u4 hi, lo; hi = (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | (u4(p[3]) ); lo = (u4(p[4]) << 24) | (u4(p[5]) << 16) | (u4(p[6]) << 8) | (u4(p[7]) ); return u8(lo) | (u8(hi) << 32); } static inline void put_Java_u2(address p, u2 x) { p[0] = x >> 8; p[1] = x; } static inline void put_Java_u4(address p, u4 x) { p[0] = x >> 24; p[1] = x >> 16; p[2] = x >> 8; p[3] = x; } static inline void put_Java_u8(address p, u8 x) { u4 hi, lo; lo = x; hi = x >> 32; p[0] = hi >> 24; p[1] = hi >> 16; p[2] = hi >> 8; p[3] = hi; p[4] = lo >> 24; p[5] = lo >> 16; p[6] = lo >> 8; p[7] = lo; } // Efficient swapping of byte ordering static inline u2 swap_u2(u2 x); static inline u4 swap_u4(u4 x); static inline u8 swap_u8(u8 x); #else // No byte-order reversal is needed static inline u2 get_Java_u2(address p) { return get_native_u2(p); } static inline u4 get_Java_u4(address p) { return get_native_u4(p); } static inline u8 get_Java_u8(address p) { return get_native_u8(p); } static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); } static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); } static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); } // No byte-order reversal is needed static inline u2 swap_u2(u2 x) { return x; } static inline u4 swap_u4(u4 x) { return x; } static inline u8 swap_u8(u8 x) { return x; } #endif // VM_LITTLE_ENDIAN }; #ifdef VM_LITTLE_ENDIAN // The following header contains the implementations of swap_u2, // swap_u4, and swap_u8 #ifdef TARGET_OS_ARCH_linux_zero # include "bytes_linux_zero.inline.hpp" #endif #ifdef TARGET_OS_ARCH_bsd_zero # include "bytes_bsd_zero.inline.hpp" #endif #endif // VM_LITTLE_ENDIAN #endif // CPU_ZERO_VM_BYTES_ZERO_HPP