Mercurial > hg > truffle
comparison src/cpu/x86/vm/bytes_x86.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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" |