-/* -*-c-*-
- * This file contains the hashing implementation.
- *
- * Copyright (C) 1991 Threaded Technologies Inc.
- *
- * 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 1, or 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 receive a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- $Header: /usr/user/dennis_glatting/ObjC/c-runtime/hash/RCS/hash.c,v 0.11 1992/01/03 02:55:03 dennisg Exp dennisg $
+/* -*-c-*- */
+
+/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* As a special exception, if you link this library with files
+ compiled with GCC to produce an executable, this does not cause
+ the resulting executable to be covered by the GNU General Public License.
+ This exception does not however invalidate any other reasons why
+ the executable file might be covered by the GNU General Public License. */
+
+/*
+ $Header: /usr/user/dennis_glatting/ObjC/c-runtime/dispatch.common/RCS/hash.c,v 0.12 1992/04/13 11:43:08 dennisg Exp dennisg $
$Author: dennisg $
- $Date: 1992/01/03 02:55:03 $
+ $Date: 1992/04/13 11:43:08 $
$Log: hash.c,v $
+ * Revision 0.12 1992/04/13 11:43:08 dennisg
+ * Check in after array version of run-time works.
+ * Expect more changes as hash version and other changes are made.
+ *
* Revision 0.11 1992/01/03 02:55:03 dennisg
* modified to handle new initialization scheme.
* fixed code structure.
-/* -*-c-*-
- * This is a general purpose hash object.
- *
- * The hash object used throughout the run-time
- * is an integer hash. The key and data is of type
- * void*. The hashing function converts the key to
- * an integer and computes it hash value.
- *
- * Copyright (C) 1991 Threaded Technologies Inc.
- *
- * 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 1, or 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 receive a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- $Header: /usr/user/dennis_glatting/ObjC/c-runtime/hash/RCS/hash.h,v 0.8 1991/12/10 12:05:28 dennisg Exp dennisg $
+/* -*-c-*- */
+
+/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* As a special exception, if you link this library with files
+ compiled with GCC to produce an executable, this does not cause
+ the resulting executable to be covered by the GNU General Public License.
+ This exception does not however invalidate any other reasons why
+ the executable file might be covered by the GNU General Public License. */
+
+/*
+ $Header: /usr/user/dennis_glatting/ObjC/c-runtime/dispatch.common/RCS/hash.h,v 0.9 1992/04/13 11:43:08 dennisg Exp dennisg $
$Author: dennisg $
- $Date: 1991/12/10 12:05:28 $
+ $Date: 1992/04/13 11:43:08 $
$Log: hash.h,v $
+ * Revision 0.9 1992/04/13 11:43:08 dennisg
+ * Check in after array version of run-time works.
+ * Expect more changes as hash version and other changes are made.
+ *
* Revision 0.8 1991/12/10 12:05:28 dennisg
* Cleaned up file format for a distribution.
*
extern "C" {
#endif
-#include <assert.h>
#include <sys/types.h>
-#include <mutex.h>
+#include <mutex.h>
/*
* This data structure is used to hold items
* typedef. Therefore, to remove compiler warnings the functions passed to
* hash_new() will have to be casted to this type.
*/
-typedef u_int (*HashFunc)(void*, void*);
+typedef u_int (*HashFunc)(void*, void*);
/*
* This data type is the function that compares two hash keys and returns an
* second.
*/
-typedef int (*CompareFunc)(void*, void*);
+typedef int (*CompareFunc)(void*, void*);
/*
a power of two. */
entriesInHash, /* Current number of entries
in the hash table. */
- mask; /* Precomputed mask. */
+ mask; /* Precomputed mask. */
/*
* Variables used to implement indexing
* through the hash table.
u_int lastBucket; /* Tracks which entry in the
array where the last value
was returned. */
- /* Function used to compute
- a hash code given a key.
- This function is specified
- when the hash table is
- created. */
- HashFunc hashFunc;
- /* Function used to compare
- two hash keys to determine
- if they are equal. */
- CompareFunc compareFunc;
+ /* Function used to compute
+ a hash code given a key.
+ This function is specified
+ when the hash table is
+ created. */
+ HashFunc hashFunc;
+ /* Function used to compare
+ two hash keys to determine
+ if they are equal. */
+ CompareFunc compareFunc;
} Cache, *Cache_t;
CacheNode_t
hash_next (Cache_t theCache, CacheNode_t aCacheNode);
- /* Used to return a value from
- a hash table using a given
- key. */
+ /* Used to return a value from
+ a hash table using a given
+ key. */
void*
hash_value_for_key (Cache_t theCache, void* aKey);
/************************************************
- Useful hashing functions.
-
- Declared inline for your pleaseure.
-
+ Useful hashing functions.
+
+ Declared inline for your pleaseure.
+
************************************************/
/* Calculate a hash code by
- performing some manipulation
- of the key pointer. */
+ performing some manipulation
+ of the key pointer. */
static inline u_int
intHash(Cache_t theCache, void* aKey) {
assert(sizeof (u_int) == sizeof (aKey));
- return ((u_int)aKey >> (sizeof(void*) - 1)) & theCache->mask ;
+ return ((u_int)aKey >> (sizeof(void*) - 1)) & theCache->mask ;
}
/* Calculate a hash code by
- iterating over a NULL
- terminate string. */
+ iterating over a NULL
+ terminate string. */
static inline u_int
strHash(Cache_t theCache, void* aKey) {
- u_int ret = 0;
- u_int ctr = 0;
-
-
- while(*(char*)aKey) {
- ret ^= *(char*)aKey++ << ctr;
- ctr = (ctr + 1) % sizeof(void*);
- }
+ u_int ret = 0;
+ u_int ctr = 0;
+
+
+ while(*(char*)aKey) {
+ ret ^= *(char*)aKey++ << ctr;
+ ctr = (ctr + 1) % sizeof(void*);
+ }
- return ret & theCache->mask ;
+ return ret & theCache->mask ;
}
- /* Compare two integers. */
+ /* Compare two integers. */
static inline int
intCmp(void* k1, void* k2) {
- return !((int)k1 - (int)k2);
+ return !((int)k1 - (int)k2);
}
- /* Compare two strings. */
+ /* Compare two strings. */
static inline int
strCmp(void* k1, void* k2) {
- return !strcmp( k1, k2 );
+ return !strcmp( k1, k2 );
}
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