Mercurial > hg > graal-jvmci-8
diff src/cpu/zero/vm/bytes_zero.hpp @ 1010:354d3184f6b2
6890308: integrate zero assembler hotspot changes
Reviewed-by: never
Contributed-by: gbenson@redhat.com
author | never |
---|---|
date | Tue, 13 Oct 2009 12:04:21 -0700 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/zero/vm/bytes_zero.hpp Tue Oct 13 12:04:21 2009 -0700 @@ -0,0 +1,164 @@ +/* + * Copyright 1997-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +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 +#include "incls/_bytes_pd.inline.hpp.incl" +#endif // VM_LITTLE_ENDIAN