| /* Include file cached obstack implementation. |
| Written by Fred Fish (fnf@cygnus.com) |
| Copyright 1995 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #ifndef BCACHE_H |
| #define BCACHE_H 1 |
| |
| #define BCACHE_HASHLENGTH 12 /* Number of bits in hash value */ |
| #define BCACHE_HASHSIZE (1 << BCACHE_HASHLENGTH) |
| #define BCACHE_MAXLENGTH 128 |
| |
| /* Note that the user data is stored in data[]. Since it can be any type, |
| it needs to have the same alignment as the most strict alignment of |
| any type on the host machine. So do it the same way obstack does. */ |
| |
| struct hashlink |
| { |
| struct hashlink *next; |
| union |
| { |
| char data[1]; |
| double dummy; |
| } |
| d; |
| }; |
| |
| /* BCACHE_DATA is used to get the address of the cached data. */ |
| |
| #define BCACHE_DATA(p) ((p)->d.data) |
| |
| /* BCACHE_DATA_ALIGNMENT is used to get the offset of the start of |
| cached data within the hashlink struct. This value, plus the |
| size of the cached data, is the amount of space to allocate for |
| a hashlink struct to hold the next pointer and the data. */ |
| |
| #define BCACHE_DATA_ALIGNMENT \ |
| (((char *) BCACHE_DATA((struct hashlink*) 0) - (char *) 0)) |
| |
| struct bcache |
| { |
| struct obstack cache; |
| struct hashlink **indextable[BCACHE_MAXLENGTH]; |
| int cache_hits; |
| int cache_misses; |
| int cache_bytes; |
| int cache_savings; |
| int bcache_overflows; |
| }; |
| |
| extern void * |
| bcache PARAMS ((void *bytes, int count, struct bcache * bcachep)); |
| |
| extern void |
| print_bcache_statistics PARAMS ((struct bcache *, char *)); |
| |
| #endif /* BCACHE_H */ |