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