Initial creation of sourceware repository

gdb/bcache.h

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+/* 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));
+
+#if MAINTENANCE_CMDS
+
+extern void
+print_bcache_statistics PARAMS ((struct bcache *, char *));
+
+#endif	/* MAINTENANCE_CMDS */
+
+#endif /* BCACHE_H */