duke@435: /* trims@1907: * Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: duke@435: class Bytes: AllStatic { duke@435: public: duke@435: // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering duke@435: // Sparc needs to check for alignment. duke@435: duke@435: // can I count on address always being a pointer to an unsigned char? Yes duke@435: duke@435: // Returns true, if the byte ordering used by Java is different from the nativ byte ordering duke@435: // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc. duke@435: static inline bool is_Java_byte_ordering_different() { return false; } duke@435: duke@435: // Thus, a swap between native and Java ordering is always a no-op: duke@435: static inline u2 swap_u2(u2 x) { return x; } duke@435: static inline u4 swap_u4(u4 x) { return x; } duke@435: static inline u8 swap_u8(u8 x) { return x; } duke@435: duke@435: static inline u2 get_native_u2(address p){ duke@435: return (intptr_t(p) & 1) == 0 duke@435: ? *(u2*)p duke@435: : ( u2(p[0]) << 8 ) duke@435: | ( u2(p[1]) ); duke@435: } duke@435: duke@435: static inline u4 get_native_u4(address p) { duke@435: switch (intptr_t(p) & 3) { duke@435: case 0: return *(u4*)p; duke@435: duke@435: case 2: return ( u4( ((u2*)p)[0] ) << 16 ) duke@435: | ( u4( ((u2*)p)[1] ) ); duke@435: duke@435: default: return ( u4(p[0]) << 24 ) duke@435: | ( u4(p[1]) << 16 ) duke@435: | ( u4(p[2]) << 8 ) duke@435: | u4(p[3]); duke@435: } duke@435: } duke@435: duke@435: static inline u8 get_native_u8(address p) { duke@435: switch (intptr_t(p) & 7) { duke@435: case 0: return *(u8*)p; duke@435: duke@435: case 4: return ( u8( ((u4*)p)[0] ) << 32 ) duke@435: | ( u8( ((u4*)p)[1] ) ); duke@435: duke@435: case 2: return ( u8( ((u2*)p)[0] ) << 48 ) duke@435: | ( u8( ((u2*)p)[1] ) << 32 ) duke@435: | ( u8( ((u2*)p)[2] ) << 16 ) duke@435: | ( u8( ((u2*)p)[3] ) ); duke@435: duke@435: default: return ( u8(p[0]) << 56 ) duke@435: | ( u8(p[1]) << 48 ) duke@435: | ( u8(p[2]) << 40 ) duke@435: | ( u8(p[3]) << 32 ) duke@435: | ( u8(p[4]) << 24 ) duke@435: | ( u8(p[5]) << 16 ) duke@435: | ( u8(p[6]) << 8 ) duke@435: | u8(p[7]); duke@435: } duke@435: } duke@435: duke@435: duke@435: duke@435: static inline void put_native_u2(address p, u2 x) { duke@435: if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x; duke@435: else { duke@435: p[0] = x >> 8; duke@435: p[1] = x; duke@435: } duke@435: } duke@435: duke@435: static inline void put_native_u4(address p, u4 x) { duke@435: switch ( intptr_t(p) & 3 ) { duke@435: case 0: *(u4*)p = x; duke@435: break; duke@435: duke@435: case 2: ((u2*)p)[0] = x >> 16; duke@435: ((u2*)p)[1] = x; duke@435: break; duke@435: duke@435: default: ((u1*)p)[0] = x >> 24; duke@435: ((u1*)p)[1] = x >> 16; duke@435: ((u1*)p)[2] = x >> 8; duke@435: ((u1*)p)[3] = x; duke@435: break; duke@435: } duke@435: } duke@435: duke@435: static inline void put_native_u8(address p, u8 x) { duke@435: switch ( intptr_t(p) & 7 ) { duke@435: case 0: *(u8*)p = x; duke@435: break; duke@435: duke@435: case 4: ((u4*)p)[0] = x >> 32; duke@435: ((u4*)p)[1] = x; duke@435: break; duke@435: duke@435: case 2: ((u2*)p)[0] = x >> 48; duke@435: ((u2*)p)[1] = x >> 32; duke@435: ((u2*)p)[2] = x >> 16; duke@435: ((u2*)p)[3] = x; duke@435: break; duke@435: duke@435: default: ((u1*)p)[0] = x >> 56; duke@435: ((u1*)p)[1] = x >> 48; duke@435: ((u1*)p)[2] = x >> 40; duke@435: ((u1*)p)[3] = x >> 32; duke@435: ((u1*)p)[4] = x >> 24; duke@435: ((u1*)p)[5] = x >> 16; duke@435: ((u1*)p)[6] = x >> 8; duke@435: ((u1*)p)[7] = x; duke@435: } duke@435: } duke@435: duke@435: duke@435: // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering) duke@435: // (no byte-order reversal is needed since SPARC CPUs are big-endian oriented) duke@435: static inline u2 get_Java_u2(address p) { return get_native_u2(p); } duke@435: static inline u4 get_Java_u4(address p) { return get_native_u4(p); } duke@435: static inline u8 get_Java_u8(address p) { return get_native_u8(p); } duke@435: duke@435: static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); } duke@435: static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); } duke@435: static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); } duke@435: }; duke@435: duke@435: //Reconciliation History duke@435: // 1.7 98/02/24 10:18:41 bytes_i486.hpp duke@435: // 1.10 98/04/08 18:47:57 bytes_i486.hpp duke@435: // 1.13 98/07/15 17:10:03 bytes_i486.hpp duke@435: // 1.14 98/08/13 10:38:23 bytes_i486.hpp duke@435: // 1.15 98/10/05 16:30:21 bytes_i486.hpp duke@435: // 1.17 99/06/22 16:37:35 bytes_i486.hpp duke@435: //End