161 lines
5.0 KiB
C++
161 lines
5.0 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_SPARC_VM_BYTES_SPARC_HPP
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#define CPU_SPARC_VM_BYTES_SPARC_HPP
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#include "memory/allocation.hpp"
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class Bytes: AllStatic {
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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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// Sparc needs to check for alignment.
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// can I count on address always being a pointer to an unsigned char? Yes
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// Thus, a swap between native and Java ordering is always a no-op:
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static inline u2 swap_u2(u2 x) { return x; }
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static inline u4 swap_u4(u4 x) { return x; }
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static inline u8 swap_u8(u8 x) { return x; }
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static inline u2 get_native_u2(address p){
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return (intptr_t(p) & 1) == 0
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? *(u2*)p
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: ( u2(p[0]) << 8 )
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| ( u2(p[1]) );
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}
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static inline u4 get_native_u4(address p) {
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switch (intptr_t(p) & 3) {
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case 0: return *(u4*)p;
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case 2: return ( u4( ((u2*)p)[0] ) << 16 )
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| ( u4( ((u2*)p)[1] ) );
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default: return ( u4(p[0]) << 24 )
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| ( u4(p[1]) << 16 )
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| ( u4(p[2]) << 8 )
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| u4(p[3]);
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}
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}
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static inline u8 get_native_u8(address p) {
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switch (intptr_t(p) & 7) {
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case 0: return *(u8*)p;
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case 4: return ( u8( ((u4*)p)[0] ) << 32 )
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| ( u8( ((u4*)p)[1] ) );
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case 2: return ( u8( ((u2*)p)[0] ) << 48 )
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| ( u8( ((u2*)p)[1] ) << 32 )
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| ( u8( ((u2*)p)[2] ) << 16 )
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| ( u8( ((u2*)p)[3] ) );
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default: return ( u8(p[0]) << 56 )
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| ( u8(p[1]) << 48 )
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| ( u8(p[2]) << 40 )
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| ( u8(p[3]) << 32 )
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| ( u8(p[4]) << 24 )
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| ( u8(p[5]) << 16 )
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| ( u8(p[6]) << 8 )
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| u8(p[7]);
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}
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}
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static inline void put_native_u2(address p, u2 x) {
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if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x;
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else {
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p[0] = x >> 8;
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p[1] = x;
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}
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}
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static inline void put_native_u4(address p, u4 x) {
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switch ( intptr_t(p) & 3 ) {
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case 0: *(u4*)p = x;
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break;
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case 2: ((u2*)p)[0] = x >> 16;
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((u2*)p)[1] = x;
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break;
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default: ((u1*)p)[0] = x >> 24;
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((u1*)p)[1] = x >> 16;
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((u1*)p)[2] = x >> 8;
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((u1*)p)[3] = x;
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break;
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}
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}
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static inline void put_native_u8(address p, u8 x) {
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switch ( intptr_t(p) & 7 ) {
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case 0: *(u8*)p = x;
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break;
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case 4: ((u4*)p)[0] = x >> 32;
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((u4*)p)[1] = x;
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break;
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case 2: ((u2*)p)[0] = x >> 48;
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((u2*)p)[1] = x >> 32;
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((u2*)p)[2] = x >> 16;
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((u2*)p)[3] = x;
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break;
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default: ((u1*)p)[0] = x >> 56;
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((u1*)p)[1] = x >> 48;
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((u1*)p)[2] = x >> 40;
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((u1*)p)[3] = x >> 32;
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((u1*)p)[4] = x >> 24;
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((u1*)p)[5] = x >> 16;
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((u1*)p)[6] = x >> 8;
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((u1*)p)[7] = x;
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}
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}
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// Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
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// (no byte-order reversal is needed since SPARC CPUs are big-endian oriented)
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static inline u2 get_Java_u2(address p) { return get_native_u2(p); }
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static inline u4 get_Java_u4(address p) { return get_native_u4(p); }
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static inline u8 get_Java_u8(address p) { return get_native_u8(p); }
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static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); }
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static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); }
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static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); }
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};
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//Reconciliation History
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// 1.7 98/02/24 10:18:41 bytes_i486.hpp
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// 1.10 98/04/08 18:47:57 bytes_i486.hpp
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// 1.13 98/07/15 17:10:03 bytes_i486.hpp
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// 1.14 98/08/13 10:38:23 bytes_i486.hpp
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// 1.15 98/10/05 16:30:21 bytes_i486.hpp
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// 1.17 99/06/22 16:37:35 bytes_i486.hpp
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//End
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#endif // CPU_SPARC_VM_BYTES_SPARC_HPP
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