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comparison src/cpu/x86/vm/bytes_x86.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class Bytes: AllStatic {
26 private:
27 #ifndef AMD64
28 // Helper function for swap_u8
29 static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation
30 #endif // AMD64
31
32 public:
33 // Returns true if the byte ordering used by Java is different from the native byte ordering
34 // of the underlying machine. For example, this is true for Intel x86, but false for Solaris
35 // on Sparc.
36 static inline bool is_Java_byte_ordering_different(){ return true; }
37
38
39 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
40 // (no special code is needed since x86 CPUs can access unaligned data)
41 static inline u2 get_native_u2(address p) { return *(u2*)p; }
42 static inline u4 get_native_u4(address p) { return *(u4*)p; }
43 static inline u8 get_native_u8(address p) { return *(u8*)p; }
44
45 static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; }
46 static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
47 static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
48
49
50 // Efficient reading and writing of unaligned unsigned data in Java
51 // byte ordering (i.e. big-endian ordering). Byte-order reversal is
52 // needed since x86 CPUs use little-endian format.
53 static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); }
54 static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); }
55 static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); }
56
57 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); }
58 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); }
59 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); }
60
61
62 // Efficient swapping of byte ordering
63 static inline u2 swap_u2(u2 x); // compiler-dependent implementation
64 static inline u4 swap_u4(u4 x); // compiler-dependent implementation
65 static inline u8 swap_u8(u8 x);
66 };
67
68
69 // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
70 #include "incls/_bytes_pd.inline.hpp.incl"