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annotate src/cpu/sparc/vm/bytes_sparc.hpp @ 4655:0c392b1bd7cc
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author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 20 Feb 2012 17:58:46 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef CPU_SPARC_VM_BYTES_SPARC_HPP |
26 #define CPU_SPARC_VM_BYTES_SPARC_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 | |
0 | 30 class Bytes: AllStatic { |
31 public: | |
32 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering | |
33 // Sparc needs to check for alignment. | |
34 | |
35 // can I count on address always being a pointer to an unsigned char? Yes | |
36 | |
37 // Returns true, if the byte ordering used by Java is different from the nativ byte ordering | |
38 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc. | |
39 static inline bool is_Java_byte_ordering_different() { return false; } | |
40 | |
41 // Thus, a swap between native and Java ordering is always a no-op: | |
42 static inline u2 swap_u2(u2 x) { return x; } | |
43 static inline u4 swap_u4(u4 x) { return x; } | |
44 static inline u8 swap_u8(u8 x) { return x; } | |
45 | |
46 static inline u2 get_native_u2(address p){ | |
47 return (intptr_t(p) & 1) == 0 | |
48 ? *(u2*)p | |
49 : ( u2(p[0]) << 8 ) | |
50 | ( u2(p[1]) ); | |
51 } | |
52 | |
53 static inline u4 get_native_u4(address p) { | |
54 switch (intptr_t(p) & 3) { | |
55 case 0: return *(u4*)p; | |
56 | |
57 case 2: return ( u4( ((u2*)p)[0] ) << 16 ) | |
58 | ( u4( ((u2*)p)[1] ) ); | |
59 | |
60 default: return ( u4(p[0]) << 24 ) | |
61 | ( u4(p[1]) << 16 ) | |
62 | ( u4(p[2]) << 8 ) | |
63 | u4(p[3]); | |
64 } | |
65 } | |
66 | |
67 static inline u8 get_native_u8(address p) { | |
68 switch (intptr_t(p) & 7) { | |
69 case 0: return *(u8*)p; | |
70 | |
71 case 4: return ( u8( ((u4*)p)[0] ) << 32 ) | |
72 | ( u8( ((u4*)p)[1] ) ); | |
73 | |
74 case 2: return ( u8( ((u2*)p)[0] ) << 48 ) | |
75 | ( u8( ((u2*)p)[1] ) << 32 ) | |
76 | ( u8( ((u2*)p)[2] ) << 16 ) | |
77 | ( u8( ((u2*)p)[3] ) ); | |
78 | |
79 default: return ( u8(p[0]) << 56 ) | |
80 | ( u8(p[1]) << 48 ) | |
81 | ( u8(p[2]) << 40 ) | |
82 | ( u8(p[3]) << 32 ) | |
83 | ( u8(p[4]) << 24 ) | |
84 | ( u8(p[5]) << 16 ) | |
85 | ( u8(p[6]) << 8 ) | |
86 | u8(p[7]); | |
87 } | |
88 } | |
89 | |
90 | |
91 | |
92 static inline void put_native_u2(address p, u2 x) { | |
93 if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x; | |
94 else { | |
95 p[0] = x >> 8; | |
96 p[1] = x; | |
97 } | |
98 } | |
99 | |
100 static inline void put_native_u4(address p, u4 x) { | |
101 switch ( intptr_t(p) & 3 ) { | |
102 case 0: *(u4*)p = x; | |
103 break; | |
104 | |
105 case 2: ((u2*)p)[0] = x >> 16; | |
106 ((u2*)p)[1] = x; | |
107 break; | |
108 | |
109 default: ((u1*)p)[0] = x >> 24; | |
110 ((u1*)p)[1] = x >> 16; | |
111 ((u1*)p)[2] = x >> 8; | |
112 ((u1*)p)[3] = x; | |
113 break; | |
114 } | |
115 } | |
116 | |
117 static inline void put_native_u8(address p, u8 x) { | |
118 switch ( intptr_t(p) & 7 ) { | |
119 case 0: *(u8*)p = x; | |
120 break; | |
121 | |
122 case 4: ((u4*)p)[0] = x >> 32; | |
123 ((u4*)p)[1] = x; | |
124 break; | |
125 | |
126 case 2: ((u2*)p)[0] = x >> 48; | |
127 ((u2*)p)[1] = x >> 32; | |
128 ((u2*)p)[2] = x >> 16; | |
129 ((u2*)p)[3] = x; | |
130 break; | |
131 | |
132 default: ((u1*)p)[0] = x >> 56; | |
133 ((u1*)p)[1] = x >> 48; | |
134 ((u1*)p)[2] = x >> 40; | |
135 ((u1*)p)[3] = x >> 32; | |
136 ((u1*)p)[4] = x >> 24; | |
137 ((u1*)p)[5] = x >> 16; | |
138 ((u1*)p)[6] = x >> 8; | |
139 ((u1*)p)[7] = x; | |
140 } | |
141 } | |
142 | |
143 | |
144 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering) | |
145 // (no byte-order reversal is needed since SPARC CPUs are big-endian oriented) | |
146 static inline u2 get_Java_u2(address p) { return get_native_u2(p); } | |
147 static inline u4 get_Java_u4(address p) { return get_native_u4(p); } | |
148 static inline u8 get_Java_u8(address p) { return get_native_u8(p); } | |
149 | |
150 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); } | |
151 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); } | |
152 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); } | |
153 }; | |
154 | |
155 //Reconciliation History | |
156 // 1.7 98/02/24 10:18:41 bytes_i486.hpp | |
157 // 1.10 98/04/08 18:47:57 bytes_i486.hpp | |
158 // 1.13 98/07/15 17:10:03 bytes_i486.hpp | |
159 // 1.14 98/08/13 10:38:23 bytes_i486.hpp | |
160 // 1.15 98/10/05 16:30:21 bytes_i486.hpp | |
161 // 1.17 99/06/22 16:37:35 bytes_i486.hpp | |
162 //End | |
1972 | 163 |
164 #endif // CPU_SPARC_VM_BYTES_SPARC_HPP |