Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/cpu/x86/vm/bytes_x86.hpp
src/cpu/x86/vm/bytes_x86.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef CPU_X86_VM_BYTES_X86_HPP | |
| 26 #define CPU_X86_VM_BYTES_X86_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 | |
| 30 class Bytes: AllStatic { | |
| 31 private: | |
| 32 #ifndef AMD64 | |
| 33 // Helper function for swap_u8 | |
| 34 static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation | |
| 35 #endif // AMD64 | |
| 36 | |
| 37 public: | |
| 38 // Returns true if the byte ordering used by Java is different from the native byte ordering | |
| 39 // of the underlying machine. For example, this is true for Intel x86, but false for Solaris | |
| 40 // on Sparc. | |
| 41 static inline bool is_Java_byte_ordering_different(){ return true; } | |
| 42 | |
| 43 | |
| 44 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering | |
| 45 // (no special code is needed since x86 CPUs can access unaligned data) | |
| 46 static inline u2 get_native_u2(address p) { return *(u2*)p; } | |
| 47 static inline u4 get_native_u4(address p) { return *(u4*)p; } | |
| 48 static inline u8 get_native_u8(address p) { return *(u8*)p; } | |
| 49 | |
| 50 static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; } | |
| 51 static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; } | |
| 52 static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; } | |
| 53 | |
| 54 | |
| 55 // Efficient reading and writing of unaligned unsigned data in Java | |
| 56 // byte ordering (i.e. big-endian ordering). Byte-order reversal is | |
| 57 // needed since x86 CPUs use little-endian format. | |
| 58 static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); } | |
| 59 static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); } | |
| 60 static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); } | |
| 61 | |
| 62 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); } | |
| 63 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); } | |
| 64 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); } | |
| 65 | |
| 66 | |
| 67 // Efficient swapping of byte ordering | |
| 68 static inline u2 swap_u2(u2 x); // compiler-dependent implementation | |
| 69 static inline u4 swap_u4(u4 x); // compiler-dependent implementation | |
| 70 static inline u8 swap_u8(u8 x); | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base] | |
| 75 #ifdef TARGET_OS_ARCH_linux_x86 | |
| 76 # include "bytes_linux_x86.inline.hpp" | |
| 77 #endif | |
| 78 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 79 # include "bytes_solaris_x86.inline.hpp" | |
| 80 #endif | |
| 81 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 82 # include "bytes_windows_x86.inline.hpp" | |
| 83 #endif | |
| 84 #ifdef TARGET_OS_ARCH_bsd_x86 | |
| 85 # include "bytes_bsd_x86.inline.hpp" | |
| 86 #endif | |
| 87 | |
| 88 | |
| 89 #endif // CPU_X86_VM_BYTES_X86_HPP |
