Mercurial > jdk8-mips64-public > hotspot / annotate
src/cpu/x86/vm/bytes_x86.hpp@f90c822e73f8 (annotated)
src/cpu/x86/vm/bytes_x86.hpp
Wed, 27 Apr 2016 01:25:04 +0800
- author
- aoqi
- date
- Wed, 27 Apr 2016 01:25:04 +0800
- changeset 0
- f90c822e73f8
- child 6876
- 710a3c8b516e
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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef CPU_X86_VM_BYTES_X86_HPP |
| aoqi@0 | 26 | #define CPU_X86_VM_BYTES_X86_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "memory/allocation.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | class Bytes: AllStatic { |
| aoqi@0 | 31 | private: |
| aoqi@0 | 32 | #ifndef AMD64 |
| aoqi@0 | 33 | // Helper function for swap_u8 |
| aoqi@0 | 34 | static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation |
| aoqi@0 | 35 | #endif // AMD64 |
| aoqi@0 | 36 | |
| aoqi@0 | 37 | public: |
| aoqi@0 | 38 | // Returns true if the byte ordering used by Java is different from the native byte ordering |
| aoqi@0 | 39 | // of the underlying machine. For example, this is true for Intel x86, but false for Solaris |
| aoqi@0 | 40 | // on Sparc. |
| aoqi@0 | 41 | static inline bool is_Java_byte_ordering_different(){ return true; } |
| aoqi@0 | 42 | |
| aoqi@0 | 43 | |
| aoqi@0 | 44 | // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering |
| aoqi@0 | 45 | // (no special code is needed since x86 CPUs can access unaligned data) |
| aoqi@0 | 46 | static inline u2 get_native_u2(address p) { return *(u2*)p; } |
| aoqi@0 | 47 | static inline u4 get_native_u4(address p) { return *(u4*)p; } |
| aoqi@0 | 48 | static inline u8 get_native_u8(address p) { return *(u8*)p; } |
| aoqi@0 | 49 | |
| aoqi@0 | 50 | static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; } |
| aoqi@0 | 51 | static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; } |
| aoqi@0 | 52 | static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; } |
| aoqi@0 | 53 | |
| aoqi@0 | 54 | |
| aoqi@0 | 55 | // Efficient reading and writing of unaligned unsigned data in Java |
| aoqi@0 | 56 | // byte ordering (i.e. big-endian ordering). Byte-order reversal is |
| aoqi@0 | 57 | // needed since x86 CPUs use little-endian format. |
| aoqi@0 | 58 | static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); } |
| aoqi@0 | 59 | static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); } |
| aoqi@0 | 60 | static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); } |
| aoqi@0 | 61 | |
| aoqi@0 | 62 | static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); } |
| aoqi@0 | 63 | static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); } |
| aoqi@0 | 64 | static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); } |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | |
| aoqi@0 | 67 | // Efficient swapping of byte ordering |
| aoqi@0 | 68 | static inline u2 swap_u2(u2 x); // compiler-dependent implementation |
| aoqi@0 | 69 | static inline u4 swap_u4(u4 x); // compiler-dependent implementation |
| aoqi@0 | 70 | static inline u8 swap_u8(u8 x); |
| aoqi@0 | 71 | }; |
| aoqi@0 | 72 | |
| aoqi@0 | 73 | |
| aoqi@0 | 74 | // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base] |
| aoqi@0 | 75 | #ifdef TARGET_OS_ARCH_linux_x86 |
| aoqi@0 | 76 | # include "bytes_linux_x86.inline.hpp" |
| aoqi@0 | 77 | #endif |
| aoqi@0 | 78 | #ifdef TARGET_OS_ARCH_solaris_x86 |
| aoqi@0 | 79 | # include "bytes_solaris_x86.inline.hpp" |
| aoqi@0 | 80 | #endif |
| aoqi@0 | 81 | #ifdef TARGET_OS_ARCH_windows_x86 |
| aoqi@0 | 82 | # include "bytes_windows_x86.inline.hpp" |
| aoqi@0 | 83 | #endif |
| aoqi@0 | 84 | #ifdef TARGET_OS_ARCH_bsd_x86 |
| aoqi@0 | 85 | # include "bytes_bsd_x86.inline.hpp" |
| aoqi@0 | 86 | #endif |
| aoqi@0 | 87 | |
| aoqi@0 | 88 | |
| aoqi@0 | 89 | #endif // CPU_X86_VM_BYTES_X86_HPP |
