• use Jenkins’ one-at-a-time hash for mksh keytabs, as it has
much better avalanche and no known funnels • improve comments • fix some types (uint32_t for hash, size_t for sizes) • optimise ktsort() no functional change, I think
This commit is contained in:
tg
parent
8f937ec71b
commit
ca1f967a45
6
exec.c
6
exec.c
@ -22,7 +22,7 @@
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.60 2009/08/08 13:08:49 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.61 2009/08/28 18:53:57 tg Exp $");
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static int comexec(struct op *, struct tbl *volatile, const char **,
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int volatile, volatile int *);
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@ -800,7 +800,7 @@ shcomexec(const char **wp)
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* is created if none is found.
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*/
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struct tbl *
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findfunc(const char *name, unsigned int h, int create)
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findfunc(const char *name, uint32_t h, int create)
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{
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struct block *l;
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struct tbl *tp = NULL;
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@ -899,7 +899,7 @@ struct tbl *
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findcom(const char *name, int flags)
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{
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static struct tbl temp;
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unsigned int h = hash(name);
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uint32_t h = hash(name);
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struct tbl *tp = NULL, *tbi;
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unsigned char insert = Flag(FTRACKALL); /* insert if not found */
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char *fpath; /* for function autoloading */
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4
funcs.c
4
funcs.c
@ -25,7 +25,7 @@
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.120 2009/08/08 13:08:50 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.121 2009/08/28 18:53:58 tg Exp $");
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#if HAVE_KILLPG
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/*
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@ -1130,7 +1130,7 @@ c_alias(const char **wp)
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const char *alias = *wp, *val, *newval;
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char *xalias = NULL;
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struct tbl *ap;
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int h;
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uint32_t h;
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if ((val = cstrchr(alias, '='))) {
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strndupx(xalias, alias, val++ - alias, ATEMP);
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4
lex.c
4
lex.c
@ -22,7 +22,7 @@
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.89 2009/07/06 15:06:23 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/lex.c,v 1.90 2009/08/28 18:53:58 tg Exp $");
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/*
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* states while lexing word
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@ -909,7 +909,7 @@ yylex(int cf)
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if (*ident != '\0' && (cf&(KEYWORD|ALIAS))) {
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struct tbl *p;
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int h = hash(ident);
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uint32_t h = hash(ident);
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/* { */
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if ((cf & KEYWORD) && (p = ktsearch(&keywords, ident, h)) &&
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68
main.c
68
main.c
@ -33,7 +33,7 @@
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#include <locale.h>
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#endif
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__RCSID("$MirOS: src/bin/mksh/main.c,v 1.137 2009/08/08 13:08:51 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/main.c,v 1.138 2009/08/28 18:53:59 tg Exp $");
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extern char **environ;
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@ -148,7 +148,8 @@ main(int argc, const char *argv[])
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initkeywords();
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/* define built-in commands */
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ktinit(&builtins, APERM, 64); /* must be 2^n (currently 44 builtins) */
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ktinit(&builtins, APERM,
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/* must be 80% of 2^n (currently 44 builtins) */ 64);
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for (i = 0; mkshbuiltins[i].name != NULL; i++)
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builtin(mkshbuiltins[i].name, mkshbuiltins[i].func);
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@ -1233,36 +1234,36 @@ maketemp(Area *ap, Temp_type type, struct temp **tlist)
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#define INIT_TBLS 8 /* initial table size (power of 2) */
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static void texpand(struct table *, int);
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static void texpand(struct table *, size_t);
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static int tnamecmp(const void *, const void *);
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unsigned int
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hash(const char *n)
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/* Bob Jenkins' one-at-a-time hash */
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uint32_t
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hash(const char *cp)
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{
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unsigned int h = 0;
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register uint32_t h = 0;
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register uint8_t c;
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register const uint8_t *bp = (const uint8_t *)cp;
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while (*n != '\0')
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h = 2*h + *n++;
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return (h * 32821); /* scatter bits */
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}
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while ((c = *bp++)) {
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h += c;
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h += h << 10;
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h ^= h >> 6;
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}
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void
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ktinit(struct table *tp, Area *ap, int tsize)
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{
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tp->areap = ap;
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tp->tbls = NULL;
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tp->size = tp->nfree = 0;
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if (tsize)
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texpand(tp, tsize);
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h += h << 3;
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h ^= h >> 11;
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h += h << 15;
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return (h);
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}
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static void
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texpand(struct table *tp, int nsize)
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texpand(struct table *tp, size_t nsize)
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{
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int i;
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size_t i, osize = tp->size;
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struct tbl *tblp, **p;
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struct tbl **ntblp, **otblp = tp->tbls;
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int osize = tp->size;
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ntblp = alloc(nsize * sizeof(struct tbl *), tp->areap);
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for (i = 0; i < nsize; i++)
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@ -1288,11 +1289,19 @@ texpand(struct table *tp, int nsize)
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afree(otblp, tp->areap);
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}
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/* table */
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/* name to enter */
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/* hash(n) */
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void
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ktinit(struct table *tp, Area *ap, size_t tsize)
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{
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tp->areap = ap;
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tp->tbls = NULL;
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tp->size = tp->nfree = 0;
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if (tsize)
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texpand(tp, tsize);
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}
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/* table, name (key) to search for, hash(n) */
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struct tbl *
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ktsearch(struct table *tp, const char *n, unsigned int h)
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ktsearch(struct table *tp, const char *n, uint32_t h)
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{
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struct tbl **pp, *p;
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@ -1311,11 +1320,9 @@ ktsearch(struct table *tp, const char *n, unsigned int h)
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return (NULL);
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}
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/* table */
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/* name to enter */
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/* hash(n) */
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/* table, name (key) to enter, hash(n) */
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struct tbl *
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ktenter(struct table *tp, const char *n, unsigned int h)
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ktenter(struct table *tp, const char *n, uint32_t h)
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{
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struct tbl **pp, *p;
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int len;
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@ -1387,7 +1394,8 @@ ktsort(struct table *tp)
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p = alloc((tp->size + 1) * sizeof(struct tbl *), ATEMP);
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sp = tp->tbls; /* source */
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dp = p; /* dest */
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for (i = 0; i < (size_t)tp->size; i++)
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i = (size_t)tp->size;
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while (i--)
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if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
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((*dp)->flag & ARRAY)))
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dp++;
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12
sh.h
12
sh.h
@ -134,7 +134,7 @@
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#endif
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#ifdef EXTERN
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__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.323 2009/08/28 18:33:05 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.324 2009/08/28 18:53:59 tg Exp $");
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#endif
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#define MKSH_VERSION "R39 2009/08/08"
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@ -1371,7 +1371,7 @@ int glob_str(char *, XPtrV *, int);
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/* exec.c */
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int execute(struct op * volatile, volatile int, volatile int * volatile);
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int shcomexec(const char **);
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struct tbl *findfunc(const char *, unsigned int, int);
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struct tbl *findfunc(const char *, uint32_t, int);
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int define(const char *, struct op *);
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void builtin(const char *, int (*)(const char **));
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struct tbl *findcom(const char *, int);
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@ -1538,10 +1538,10 @@ void coproc_write_close(int);
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int coproc_getfd(int, const char **);
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void coproc_cleanup(int);
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struct temp *maketemp(Area *, Temp_type, struct temp **);
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unsigned int hash(const char *);
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void ktinit(struct table *, Area *, int);
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struct tbl *ktsearch(struct table *, const char *, unsigned int);
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struct tbl *ktenter(struct table *, const char *, unsigned int);
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uint32_t hash(const char *);
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void ktinit(struct table *, Area *, size_t);
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struct tbl *ktsearch(struct table *, const char *, uint32_t);
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struct tbl *ktenter(struct table *, const char *, uint32_t);
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#define ktdelete(p) do { p->flag = 0; } while (/* CONSTCOND */ 0)
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void ktwalk(struct tstate *, struct table *);
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struct tbl *ktnext(struct tstate *);
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11
syn.c
11
syn.c
@ -22,7 +22,7 @@
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/syn.c,v 1.38 2009/06/11 12:42:20 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/syn.c,v 1.39 2009/08/28 18:54:00 tg Exp $");
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struct nesting_state {
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int start_token; /* token than began nesting (eg, FOR) */
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@ -696,10 +696,10 @@ block(int type, struct op *t1, struct op *t2, char **wp)
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return (t);
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}
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const struct tokeninfo {
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const struct tokeninfo {
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const char *name;
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short val;
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short reserved;
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short val;
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short reserved;
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} tokentab[] = {
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/* Reserved words */
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{ "if", IF, true },
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@ -739,7 +739,8 @@ initkeywords(void)
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struct tokeninfo const *tt;
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struct tbl *p;
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ktinit(&keywords, APERM, 32); /* must be 2^n (currently 20 keywords) */
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ktinit(&keywords, APERM,
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/* must be 80% of 2^n (currently 20 keywords) */ 32);
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for (tt = tokentab; tt->name; tt++) {
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if (tt->reserved) {
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p = ktenter(&keywords, tt->name, hash(tt->name));
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13
var.c
13
var.c
@ -22,7 +22,7 @@
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/var.c,v 1.77 2009/08/08 13:08:53 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/var.c,v 1.78 2009/08/28 18:54:01 tg Exp $");
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/*
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* Variables
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@ -125,7 +125,8 @@ initvar(void)
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int i;
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struct tbl *tp;
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ktinit(&specials, APERM, 16); /* must be 2^n (currently 12 specials) */
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ktinit(&specials, APERM,
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/* must be 80% of 2^n (currently 12 specials) */ 16);
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for (i = 0; names[i].name; i++) {
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tp = ktenter(&specials, names[i].name, hash(names[i].name));
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tp->flag = DEFINED|ISSET;
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@ -171,9 +172,8 @@ global(const char *n)
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struct block *l = e->loc;
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struct tbl *vp;
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int c;
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unsigned int h;
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bool array;
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uint32_t val;
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uint32_t h, val;
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/* Check to see if this is an array */
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n = array_index_calc(n, &array, &val);
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@ -252,9 +252,8 @@ local(const char *n, bool copy)
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{
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struct block *l = e->loc;
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struct tbl *vp;
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unsigned int h;
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bool array;
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uint32_t val;
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uint32_t h, val;
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/* Check to see if this is an array */
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n = array_index_calc(n, &array, &val);
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@ -889,7 +888,7 @@ makenv(void)
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(vp->flag&(ISSET|EXPORT)) == (ISSET|EXPORT)) {
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struct block *l2;
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struct tbl *vp2;
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unsigned int h = hash(vp->name);
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uint32_t h = hash(vp->name);
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/* unexport any redefined instances */
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for (l2 = l->next; l2 != NULL; l2 = l2->next) {
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