69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
|
/* 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 */
|