Mercurial > jdk8-mips64-public > hotspot / annotate
src/cpu/x86/vm/bytes_x86.hpp@ba764ed4b6f2 (annotated)
src/cpu/x86/vm/bytes_x86.hpp
Sun, 13 Apr 2008 17:43:42 -0400
- author
- coleenp
- date
- Sun, 13 Apr 2008 17:43:42 -0400
- changeset 548
- ba764ed4b6f2
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
| duke@435 | 1 | /* |
| duke@435 | 2 | * Copyright 1997-2001 Sun Microsystems, Inc. All Rights Reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| duke@435 | 21 | * have any questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| duke@435 | 25 | class Bytes: AllStatic { |
| duke@435 | 26 | private: |
| duke@435 | 27 | #ifndef AMD64 |
| duke@435 | 28 | // Helper function for swap_u8 |
| duke@435 | 29 | static inline u8 swap_u8_base(u4 x, u4 y); // compiler-dependent implementation |
| duke@435 | 30 | #endif // AMD64 |
| duke@435 | 31 | |
| duke@435 | 32 | public: |
| duke@435 | 33 | // Returns true if the byte ordering used by Java is different from the native byte ordering |
| duke@435 | 34 | // of the underlying machine. For example, this is true for Intel x86, but false for Solaris |
| duke@435 | 35 | // on Sparc. |
| duke@435 | 36 | static inline bool is_Java_byte_ordering_different(){ return true; } |
| duke@435 | 37 | |
| duke@435 | 38 | |
| duke@435 | 39 | // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering |
| duke@435 | 40 | // (no special code is needed since x86 CPUs can access unaligned data) |
| duke@435 | 41 | static inline u2 get_native_u2(address p) { return *(u2*)p; } |
| duke@435 | 42 | static inline u4 get_native_u4(address p) { return *(u4*)p; } |
| duke@435 | 43 | static inline u8 get_native_u8(address p) { return *(u8*)p; } |
| duke@435 | 44 | |
| duke@435 | 45 | static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; } |
| duke@435 | 46 | static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; } |
| duke@435 | 47 | static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; } |
| duke@435 | 48 | |
| duke@435 | 49 | |
| duke@435 | 50 | // Efficient reading and writing of unaligned unsigned data in Java |
| duke@435 | 51 | // byte ordering (i.e. big-endian ordering). Byte-order reversal is |
| duke@435 | 52 | // needed since x86 CPUs use little-endian format. |
| duke@435 | 53 | static inline u2 get_Java_u2(address p) { return swap_u2(get_native_u2(p)); } |
| duke@435 | 54 | static inline u4 get_Java_u4(address p) { return swap_u4(get_native_u4(p)); } |
| duke@435 | 55 | static inline u8 get_Java_u8(address p) { return swap_u8(get_native_u8(p)); } |
| duke@435 | 56 | |
| duke@435 | 57 | static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, swap_u2(x)); } |
| duke@435 | 58 | static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, swap_u4(x)); } |
| duke@435 | 59 | static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, swap_u8(x)); } |
| duke@435 | 60 | |
| duke@435 | 61 | |
| duke@435 | 62 | // Efficient swapping of byte ordering |
| duke@435 | 63 | static inline u2 swap_u2(u2 x); // compiler-dependent implementation |
| duke@435 | 64 | static inline u4 swap_u4(u4 x); // compiler-dependent implementation |
| duke@435 | 65 | static inline u8 swap_u8(u8 x); |
| duke@435 | 66 | }; |
| duke@435 | 67 | |
| duke@435 | 68 | |
| duke@435 | 69 | // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base] |
| duke@435 | 70 | #include "incls/_bytes_pd.inline.hpp.incl" |
