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annotate src/cpu/zero/vm/bytes_zero.hpp @ 13434:a150ff9e8efc
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author | hseigel |
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date | Fri, 06 Dec 2013 11:49:50 -0500 |
parents | f08d439fab8c |
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rev | line source |
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1010 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
1010 | 3 * Copyright 2007, 2008, 2009 Red Hat, Inc. |
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 * | |
6 * This code is free software; you can redistribute it and/or modify it | |
7 * under the terms of the GNU General Public License version 2 only, as | |
8 * published by the Free Software Foundation. | |
9 * | |
10 * This code is distributed in the hope that it will be useful, but WITHOUT | |
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 * version 2 for more details (a copy is included in the LICENSE file that | |
14 * accompanied this code). | |
15 * | |
16 * You should have received a copy of the GNU General Public License version | |
17 * 2 along with this work; if not, write to the Free Software Foundation, | |
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 * | |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
1010 | 23 * |
24 */ | |
25 | |
1972 | 26 #ifndef CPU_ZERO_VM_BYTES_ZERO_HPP |
27 #define CPU_ZERO_VM_BYTES_ZERO_HPP | |
28 | |
29 #include "memory/allocation.hpp" | |
30 | |
1010 | 31 typedef union unaligned { |
32 u4 u; | |
33 u2 us; | |
34 u8 ul; | |
35 } __attribute__((packed)) unaligned; | |
36 | |
37 class Bytes: AllStatic { | |
38 public: | |
39 // Returns true if the byte ordering used by Java is different | |
40 // from the native byte ordering of the underlying machine. | |
41 static inline bool is_Java_byte_ordering_different() { | |
42 #ifdef VM_LITTLE_ENDIAN | |
43 return true; | |
44 #else | |
45 return false; | |
46 #endif | |
47 } | |
48 | |
49 // Efficient reading and writing of unaligned unsigned data in | |
50 // platform-specific byte ordering. | |
51 static inline u2 get_native_u2(address p){ | |
52 unaligned *up = (unaligned *) p; | |
53 return up->us; | |
54 } | |
55 | |
56 static inline u4 get_native_u4(address p) { | |
57 unaligned *up = (unaligned *) p; | |
58 return up->u; | |
59 } | |
60 | |
61 static inline u8 get_native_u8(address p) { | |
62 unaligned *up = (unaligned *) p; | |
63 return up->ul; | |
64 } | |
65 | |
66 static inline void put_native_u2(address p, u2 x) { | |
67 unaligned *up = (unaligned *) p; | |
68 up->us = x; | |
69 } | |
70 | |
71 static inline void put_native_u4(address p, u4 x) { | |
72 unaligned *up = (unaligned *) p; | |
73 up->u = x; | |
74 } | |
75 | |
76 static inline void put_native_u8(address p, u8 x) { | |
77 unaligned *up = (unaligned *) p; | |
78 up->ul = x; | |
79 } | |
80 | |
81 // Efficient reading and writing of unaligned unsigned data in Java | |
82 // byte ordering (i.e. big-endian ordering). | |
83 #ifdef VM_LITTLE_ENDIAN | |
84 // Byte-order reversal is needed | |
85 static inline u2 get_Java_u2(address p) { | |
86 return (u2(p[0]) << 8) | | |
87 (u2(p[1]) ); | |
88 } | |
89 static inline u4 get_Java_u4(address p) { | |
90 return (u4(p[0]) << 24) | | |
91 (u4(p[1]) << 16) | | |
92 (u4(p[2]) << 8) | | |
93 (u4(p[3]) ); | |
94 } | |
95 static inline u8 get_Java_u8(address p) { | |
96 u4 hi, lo; | |
97 hi = (u4(p[0]) << 24) | | |
98 (u4(p[1]) << 16) | | |
99 (u4(p[2]) << 8) | | |
100 (u4(p[3]) ); | |
101 lo = (u4(p[4]) << 24) | | |
102 (u4(p[5]) << 16) | | |
103 (u4(p[6]) << 8) | | |
104 (u4(p[7]) ); | |
105 return u8(lo) | (u8(hi) << 32); | |
106 } | |
107 | |
108 static inline void put_Java_u2(address p, u2 x) { | |
109 p[0] = x >> 8; | |
110 p[1] = x; | |
111 } | |
112 static inline void put_Java_u4(address p, u4 x) { | |
113 p[0] = x >> 24; | |
114 p[1] = x >> 16; | |
115 p[2] = x >> 8; | |
116 p[3] = x; | |
117 } | |
118 static inline void put_Java_u8(address p, u8 x) { | |
119 u4 hi, lo; | |
120 lo = x; | |
121 hi = x >> 32; | |
122 p[0] = hi >> 24; | |
123 p[1] = hi >> 16; | |
124 p[2] = hi >> 8; | |
125 p[3] = hi; | |
126 p[4] = lo >> 24; | |
127 p[5] = lo >> 16; | |
128 p[6] = lo >> 8; | |
129 p[7] = lo; | |
130 } | |
131 | |
132 // Efficient swapping of byte ordering | |
133 static inline u2 swap_u2(u2 x); | |
134 static inline u4 swap_u4(u4 x); | |
135 static inline u8 swap_u8(u8 x); | |
136 #else | |
137 // No byte-order reversal is needed | |
138 static inline u2 get_Java_u2(address p) { | |
139 return get_native_u2(p); | |
140 } | |
141 static inline u4 get_Java_u4(address p) { | |
142 return get_native_u4(p); | |
143 } | |
144 static inline u8 get_Java_u8(address p) { | |
145 return get_native_u8(p); | |
146 } | |
147 | |
148 static inline void put_Java_u2(address p, u2 x) { | |
149 put_native_u2(p, x); | |
150 } | |
151 static inline void put_Java_u4(address p, u4 x) { | |
152 put_native_u4(p, x); | |
153 } | |
154 static inline void put_Java_u8(address p, u8 x) { | |
155 put_native_u8(p, x); | |
156 } | |
157 | |
158 // No byte-order reversal is needed | |
159 static inline u2 swap_u2(u2 x) { return x; } | |
160 static inline u4 swap_u4(u4 x) { return x; } | |
161 static inline u8 swap_u8(u8 x) { return x; } | |
162 #endif // VM_LITTLE_ENDIAN | |
163 }; | |
164 | |
165 #ifdef VM_LITTLE_ENDIAN | |
166 // The following header contains the implementations of swap_u2, | |
167 // swap_u4, and swap_u8 | |
1972 | 168 #ifdef TARGET_OS_ARCH_linux_zero |
169 # include "bytes_linux_zero.inline.hpp" | |
170 #endif | |
3960 | 171 #ifdef TARGET_OS_ARCH_bsd_zero |
172 # include "bytes_bsd_zero.inline.hpp" | |
173 #endif | |
1972 | 174 |
1010 | 175 #endif // VM_LITTLE_ENDIAN |
1972 | 176 |
177 #endif // CPU_ZERO_VM_BYTES_ZERO_HPP |