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annotate src/cpu/x86/vm/bytes_x86.hpp @ 10408:836a62f43af9

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Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
author Doug Simon <doug.simon@oracle.com>
date Wed, 19 Jun 2013 10:45:56 +0200
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1 /*
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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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.
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22 *
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23 */
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24
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25 #ifndef CPU_X86_VM_BYTES_X86_HPP
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26 #define CPU_X86_VM_BYTES_X86_HPP
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27
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28 #include "memory/allocation.hpp"
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29
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30 class Bytes: AllStatic {
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31 private:
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32 #ifndef AMD64
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33 // Helper function for swap_u8
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34 static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation
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35 #endif // AMD64
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36
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37 public:
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38 // Returns true if the byte ordering used by Java is different from the native byte ordering
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39 // of the underlying machine. For example, this is true for Intel x86, but false for Solaris
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40 // on Sparc.
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41 static inline bool is_Java_byte_ordering_different(){ return true; }
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42
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43
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44 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
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45 // (no special code is needed since x86 CPUs can access unaligned data)
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46 static inline u2 get_native_u2(address p) { return *(u2*)p; }
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47 static inline u4 get_native_u4(address p) { return *(u4*)p; }
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48 static inline u8 get_native_u8(address p) { return *(u8*)p; }
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49
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50 static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; }
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51 static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
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52 static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
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53
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54
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55 // Efficient reading and writing of unaligned unsigned data in Java
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56 // byte ordering (i.e. big-endian ordering). Byte-order reversal is
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57 // needed since x86 CPUs use little-endian format.
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58 static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); }
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59 static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); }
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60 static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); }
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61
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62 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); }
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63 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); }
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64 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); }
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65
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66
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67 // Efficient swapping of byte ordering
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68 static inline u2 swap_u2(u2 x); // compiler-dependent implementation
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69 static inline u4 swap_u4(u4 x); // compiler-dependent implementation
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70 static inline u8 swap_u8(u8 x);
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71 };
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72
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74 // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
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75 #ifdef TARGET_OS_ARCH_linux_x86
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76 # include "bytes_linux_x86.inline.hpp"
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77 #endif
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78 #ifdef TARGET_OS_ARCH_solaris_x86
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79 # include "bytes_solaris_x86.inline.hpp"
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80 #endif
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81 #ifdef TARGET_OS_ARCH_windows_x86
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82 # include "bytes_windows_x86.inline.hpp"
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83 #endif
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84 #ifdef TARGET_OS_ARCH_bsd_x86
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85 # include "bytes_bsd_x86.inline.hpp"
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86 #endif
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89 #endif // CPU_X86_VM_BYTES_X86_HPP