-/* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997, 2000, 2001 Free Software Foundation, 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
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
- gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
\f
-#include <stdio.h>
-#include "_scm.h"
-#include "chars.h"
+#include "libguile/_scm.h"
+#include "libguile/chars.h"
+#include "libguile/ports.h"
+#include "libguile/strings.h"
+#include "libguile/symbols.h"
+#include "libguile/vectors.h"
-#include "validate.h"
-#include "hash.h"
+#include "libguile/validate.h"
+#include "libguile/hash.h"
\f
#ifndef floor
#endif
+unsigned long
+scm_string_hash (const unsigned char *str, size_t len)
+{
+ if (len > 5)
+ {
+ size_t i = 5;
+ unsigned long h = 264;
+ while (i--)
+ h = (h << 8) + (unsigned) str[h % len];
+ return h;
+ }
+ else
+ {
+ size_t i = len;
+ unsigned long h = 0;
+ while (i)
+ h = (h << 8) + (unsigned) str[--i];
+ return h;
+ }
+}
+
+
+/* Dirk:FIXME:: why downcase for characters? (2x: scm_hasher, scm_ihashv) */
+/* Dirk:FIXME:: scm_hasher could be made static. */
+
+
unsigned long
-scm_hasher(SCM obj, unsigned long n, scm_sizet d)
+scm_hasher(SCM obj, unsigned long n, size_t d)
{
- switch (7 & (int) obj) {
- case 2: case 6: /* SCM_INUMP(obj) */
- return SCM_INUM(obj) % n;
- case 4:
- if SCM_CHARP(obj)
+ switch (SCM_ITAG3 (obj)) {
+ case scm_tc3_int_1:
+ case scm_tc3_int_2:
+ return SCM_INUM(obj) % n; /* SCM_INUMP(obj) */
+ case scm_tc3_imm24:
+ if (SCM_CHARP(obj))
return (unsigned)(scm_downcase(SCM_CHAR(obj))) % n;
- switch ((int) obj) {
+ switch (SCM_UNPACK (obj)) {
#ifndef SICP
- case (int) SCM_EOL: d = 256; break;
+ case SCM_UNPACK(SCM_EOL):
+ d = 256;
+ break;
#endif
- case (int) SCM_BOOL_T: d = 257; break;
- case (int) SCM_BOOL_F: d = 258; break;
- case (int) SCM_EOF_VAL: d = 259; break;
- default: d = 263; /* perhaps should be error */
+ case SCM_UNPACK(SCM_BOOL_T):
+ d = 257;
+ break;
+ case SCM_UNPACK(SCM_BOOL_F):
+ d = 258;
+ break;
+ case SCM_UNPACK(SCM_EOF_VAL):
+ d = 259;
+ break;
+ default:
+ d = 263; /* perhaps should be error */
}
return d % n;
- default: return 263 % n; /* perhaps should be error */
- case 0:
+ default:
+ return 263 % n; /* perhaps should be error */
+ case scm_tc3_cons:
switch SCM_TYP7(obj) {
- default: return 263 % n;
+ default:
+ return 263 % n;
case scm_tc7_smob:
- switch SCM_TYP16(obj) {
- case scm_tcs_bignums:
- bighash: return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n)));
- default: return 263 % n;
-#ifdef SCM_FLOATS
- case scm_tc16_flo:
- if SCM_REALP(obj) {
- double r = SCM_REALPART(obj);
- if (floor(r)==r) {
+ switch SCM_TYP16 (obj) {
+ case scm_tc16_big:
+ return SCM_INUM (scm_modulo (obj, SCM_MAKINUM (n)));
+ default:
+ return 263 % n;
+ case scm_tc16_real:
+ {
+ double r = SCM_REAL_VALUE (obj);
+ if (floor (r) == r) {
obj = scm_inexact_to_exact (obj);
- if SCM_IMP(obj) return SCM_INUM(obj) % n;
- goto bighash;
+ if SCM_IMP (obj) return SCM_INUM (obj) % n;
+ return SCM_INUM (scm_modulo (obj, SCM_MAKINUM (n)));
}
}
- obj = scm_number_to_string(obj, SCM_MAKINUM(10));
-#endif
+ case scm_tc16_complex:
+ obj = scm_number_to_string (obj, SCM_MAKINUM (10));
}
- case scm_tcs_symbols:
case scm_tc7_string:
- case scm_tc7_substring:
- return scm_strhash(SCM_ROUCHARS(obj), (scm_sizet) SCM_ROLENGTH(obj), n);
+ return scm_string_hash (SCM_STRING_UCHARS (obj), SCM_STRING_LENGTH (obj)) % n;
+ case scm_tc7_symbol:
+ return SCM_SYMBOL_HASH (obj) % n;
case scm_tc7_wvect:
case scm_tc7_vector:
{
- scm_sizet len = SCM_LENGTH(obj);
- SCM *data = SCM_VELTS(obj);
- if (len>5)
+ size_t len = SCM_VECTOR_LENGTH(obj);
+ SCM const *data = SCM_VELTS(obj);
+ if (len > 5)
{
- scm_sizet i = d/2;
+ size_t i = d/2;
unsigned long h = 1;
- while (i--) h = ((h<<8) + (scm_hasher(data[h % len], n, 2))) % n;
+ while (i--) h = ((h << 8) + (scm_hasher (data[h % len], n, 2))) % n;
return h;
}
else
{
- scm_sizet i = len;
+ size_t i = len;
unsigned long h = (n)-1;
- while (i--) h = ((h<<8) + (scm_hasher(data[i], n, d/len))) % n;
+ while (i--) h = ((h << 8) + (scm_hasher (data[i], n, d/len))) % n;
return h;
}
}
- case scm_tcs_cons_imcar: case scm_tcs_cons_nimcar:
- if (d) return (scm_hasher(SCM_CAR(obj), n, d/2)+scm_hasher(SCM_CDR(obj), n, d/2)) % n;
+ case scm_tcs_cons_imcar:
+ case scm_tcs_cons_nimcar:
+ if (d) return (scm_hasher (SCM_CAR (obj), n, d/2)
+ + scm_hasher (SCM_CDR (obj), n, d/2)) % n;
else return 1;
case scm_tc7_port:
- return ((SCM_RDNG & SCM_CAR(obj)) ? 260 : 261) % n;
- case scm_tcs_closures: case scm_tc7_contin: case scm_tcs_subrs:
+ return ((SCM_RDNG & SCM_CELL_WORD_0 (obj)) ? 260 : 261) % n;
+ case scm_tcs_closures:
+ case scm_tcs_subrs:
return 262 % n;
}
}
\f
-unsigned int
-scm_ihashq (SCM obj, unsigned int n)
+unsigned long
+scm_ihashq (SCM obj, unsigned long n)
{
- return (((unsigned int) obj) >> 1) % n;
+ return (SCM_UNPACK (obj) >> 1) % n;
}
SCM_DEFINE (scm_hashq, "hashq", 2, 0, 0,
- (SCM obj, SCM n),
- "@deffnx primitive hashv key size\n"
- "@deffnx primitive hash key size\n"
- "Default hash functions for Guile hash tables. @var{key} is the\n"
- "object to be hashed, and @var{size} is the size of the target hash\n"
- "table. Each function returns an integer in the range 0 to\n"
- "@var{size}-1.")
+ (SCM key, SCM size),
+ "Determine a hash value for @var{key} that is suitable for\n"
+ "lookups in a hashtable of size @var{size}, where @code{eq?} is\n"
+ "used as the equality predicate. The function returns an\n"
+ "integer in the range 0 to @var{size} - 1. Note that\n"
+ "@code{hashq} may use internal addresses. Thus two calls to\n"
+ "hashq where the keys are @code{eq?} are not guaranteed to\n"
+ "deliver the same value if the key object gets garbage collected\n"
+ "in between. This can happen, for example with symbols:\n"
+ "@code{(hashq 'foo n) (gc) (hashq 'foo n)} may produce two\n"
+ "different values, since @code{foo} will be garbage collected.")
#define FUNC_NAME s_scm_hashq
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihashq (obj, SCM_INUM (n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihashq (key, SCM_INUM (size)));
}
#undef FUNC_NAME
\f
-unsigned int
-scm_ihashv (SCM obj, unsigned int n)
+unsigned long
+scm_ihashv (SCM obj, unsigned long n)
{
if (SCM_CHARP(obj))
- return ((unsigned int)(scm_downcase(SCM_CHAR(obj)))) % n; /* downcase!?!! */
+ return ((unsigned long) (scm_downcase (SCM_CHAR (obj)))) % n; /* downcase!?!! */
if (SCM_NUMP(obj))
- return (unsigned int) scm_hasher(obj, n, 10);
+ return (unsigned long) scm_hasher(obj, n, 10);
else
- return ((unsigned int)obj) % n;
+ return SCM_UNPACK (obj) % n;
}
SCM_DEFINE (scm_hashv, "hashv", 2, 0, 0,
- (SCM obj, SCM n),
- "")
+ (SCM key, SCM size),
+ "Determine a hash value for @var{key} that is suitable for\n"
+ "lookups in a hashtable of size @var{size}, where @code{eqv?} is\n"
+ "used as the equality predicate. The function returns an\n"
+ "integer in the range 0 to @var{size} - 1. Note that\n"
+ "@code{(hashv key)} may use internal addresses. Thus two calls\n"
+ "to hashv where the keys are @code{eqv?} are not guaranteed to\n"
+ "deliver the same value if the key object gets garbage collected\n"
+ "in between. This can happen, for example with symbols:\n"
+ "@code{(hashv 'foo n) (gc) (hashv 'foo n)} may produce two\n"
+ "different values, since @code{foo} will be garbage collected.")
#define FUNC_NAME s_scm_hashv
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihashv (obj, SCM_INUM (n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihashv (key, SCM_INUM (size)));
}
#undef FUNC_NAME
\f
-unsigned int
-scm_ihash (SCM obj, unsigned int n)
+unsigned long
+scm_ihash (SCM obj, unsigned long n)
{
- return (unsigned int)scm_hasher (obj, n, 10);
+ return (unsigned long) scm_hasher (obj, n, 10);
}
SCM_DEFINE (scm_hash, "hash", 2, 0, 0,
- (SCM obj, SCM n),
- "")
+ (SCM key, SCM size),
+ "Determine a hash value for @var{key} that is suitable for\n"
+ "lookups in a hashtable of size @var{size}, where @code{equal?}\n"
+ "is used as the equality predicate. The function returns an\n"
+ "integer in the range 0 to @var{size} - 1.")
#define FUNC_NAME s_scm_hash
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihash(obj, SCM_INUM(n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihash (key, SCM_INUM (size)));
}
#undef FUNC_NAME
void
scm_init_hash ()
{
-#include "hash.x"
+#include "libguile/hash.x"
}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff