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154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/*-
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* Copyright (c) 2003-2008 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/cpuset.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/pmc.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <pmc.h>
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#include <pmclog.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include "libpmcstat.h"
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static LIST_HEAD(,pmcstat_string) pmcstat_string_hash[PMCSTAT_NHASH];
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/*
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* Intern a copy of string 's', and return a pointer to the
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* interned structure.
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*/
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pmcstat_interned_string
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pmcstat_string_intern(const char *s)
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{
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struct pmcstat_string *ps;
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const struct pmcstat_string *cps;
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int hash, len;
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if ((cps = pmcstat_string_lookup(s)) != NULL)
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return (cps);
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hash = pmcstat_string_compute_hash(s);
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len = strlen(s);
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if ((ps = malloc(sizeof(*ps))) == NULL)
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err(EX_OSERR, "ERROR: Could not intern string");
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ps->ps_len = len;
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ps->ps_hash = hash;
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ps->ps_string = strdup(s);
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LIST_INSERT_HEAD(&pmcstat_string_hash[hash], ps, ps_next);
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return ((pmcstat_interned_string) ps);
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}
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const char *
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pmcstat_string_unintern(pmcstat_interned_string str)
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{
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const char *s;
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s = ((const struct pmcstat_string *) str)->ps_string;
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return (s);
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}
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/*
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* Compute a 'hash' value for a string.
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*/
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int
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pmcstat_string_compute_hash(const char *s)
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{
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unsigned hash;
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for (hash = 2166136261; *s; s++)
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hash = (hash ^ *s) * 16777619;
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return (hash & PMCSTAT_HASH_MASK);
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}
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pmcstat_interned_string
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pmcstat_string_lookup(const char *s)
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{
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struct pmcstat_string *ps;
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int hash, len;
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hash = pmcstat_string_compute_hash(s);
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len = strlen(s);
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LIST_FOREACH(ps, &pmcstat_string_hash[hash], ps_next)
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if (ps->ps_len == len && ps->ps_hash == hash &&
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strcmp(ps->ps_string, s) == 0)
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return (ps);
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return (NULL);
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}
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int
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pmcstat_string_lookup_hash(pmcstat_interned_string s)
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{
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const struct pmcstat_string *ps;
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ps = (const struct pmcstat_string *) s;
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return (ps->ps_hash);
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}
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/*
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* Destroy the string table, free'ing up space.
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*/
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void
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pmcstat_string_shutdown(void)
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{
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int i;
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struct pmcstat_string *ps, *pstmp;
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for (i = 0; i < PMCSTAT_NHASH; i++)
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LIST_FOREACH_SAFE(ps, &pmcstat_string_hash[i], ps_next,
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pstmp) {
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LIST_REMOVE(ps, ps_next);
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free(ps->ps_string);
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free(ps);
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}
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}
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/*
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* Initialize the string interning facility.
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*/
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void
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pmcstat_string_initialize(void)
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{
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int i;
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for (i = 0; i < PMCSTAT_NHASH; i++)
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LIST_INIT(&pmcstat_string_hash[i]);
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}
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