libdtrace/common/dt_inttab.c

	dt_inttab.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <assert.h>

#include <dt_inttab.h>
#include <dt_impl.h>

dt_inttab_t *
dt_inttab_create(dtrace_hdl_t *dtp)
{
    uint_t len = _dtrace_intbuckets;
    dt_inttab_t *ip;

    assert((len & (len - 1)) == 0);

    if ((ip = dt_zalloc(dtp, sizeof (dt_inttab_t))) == NULL ||
        (ip->int_hash = dt_zalloc(dtp, sizeof (void *) * len)) == NULL) {
        dt_free(dtp, ip);
        return (NULL);
    }

    ip->int_hdl = dtp;
    ip->int_hashlen = len;

    return (ip);
}

void
dt_inttab_destroy(dt_inttab_t *ip)
{
    dt_inthash_t *hp, *np;

    for (hp = ip->int_head; hp != NULL; hp = np) {
        np = hp->inh_next;
        dt_free(ip->int_hdl, hp);
    }

    dt_free(ip->int_hdl, ip->int_hash);
    dt_free(ip->int_hdl, ip);
}

int
dt_inttab_insert(dt_inttab_t *ip, uint64_t value, uint_t flags)
{
    uint_t h = value & (ip->int_hashlen - 1);
    dt_inthash_t *hp;

    if (flags & DT_INT_SHARED) {
        for (hp = ip->int_hash[h]; hp != NULL; hp = hp->inh_hash) {
            if (hp->inh_value == value && hp->inh_flags == flags)
                return (hp->inh_index);
        }
    }

    if ((hp = dt_alloc(ip->int_hdl, sizeof (dt_inthash_t))) == NULL)
        return (-1);

    hp->inh_hash = ip->int_hash[h];
    hp->inh_next = NULL;
    hp->inh_value = value;
    hp->inh_index = ip->int_index++;
    hp->inh_flags = flags;

    ip->int_hash[h] = hp;
    ip->int_nelems++;

    if (ip->int_head == NULL)
        ip->int_head = hp;
    else
        ip->int_tail->inh_next = hp;

    ip->int_tail = hp;
    return (hp->inh_index);
}

uint_t
dt_inttab_size(const dt_inttab_t *ip)
{
    return (ip->int_nelems);
}

void
dt_inttab_write(const dt_inttab_t *ip, uint64_t *dst)
{
    const dt_inthash_t *hp;

    for (hp = ip->int_head; hp != NULL; hp = hp->inh_next)
        *dst++ = hp->inh_value;
}