usr/src/cmd/mdb/common/mdb/mdb_addrvec.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1999 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <mdb/mdb_addrvec.h>
  30 #include <mdb/mdb_debug.h>
  31 #include <mdb/mdb_modapi.h>
  32
  33 #include <strings.h>
  34
  35 #define AD_INIT 16      /* initial size of addrvec array */
  36 #define AD_GROW 2       /* array growth multiplier */
  37
  38 void
  39 mdb_addrvec_create(mdb_addrvec_t *adp)
  40 {
  41         bzero(adp, sizeof (mdb_addrvec_t));
  42 }
  43
  44 void
  45 mdb_addrvec_destroy(mdb_addrvec_t *adp)
  46 {
  47         mdb_free(adp->ad_data, sizeof (uintptr_t) * adp->ad_size);
  48         bzero(adp, sizeof (mdb_addrvec_t));
  49 }
  50
  51 void
  52 mdb_addrvec_unshift(mdb_addrvec_t *adp, uintptr_t value)
  53 {
  54         if (adp->ad_nelems >= adp->ad_size) {
  55                 size_t size = adp->ad_size ? adp->ad_size * AD_GROW : AD_INIT;
  56                 void *data = mdb_alloc(sizeof (uintptr_t) * size, UM_SLEEP);
  57
  58                 bcopy(adp->ad_data, data, sizeof (uintptr_t) * adp->ad_size);
  59                 mdb_free(adp->ad_data, sizeof (uintptr_t) * adp->ad_size);
  60
  61                 adp->ad_data = data;
  62                 adp->ad_size = size;
  63         }
  64
  65         adp->ad_data[adp->ad_nelems++] = value;
  66 }
  67
  68 uintptr_t
  69 mdb_addrvec_shift(mdb_addrvec_t *adp)
  70 {
  71         if (adp->ad_ndx < adp->ad_nelems)
  72                 return (adp->ad_data[adp->ad_ndx++]);
  73
  74         return ((uintptr_t)-1L);
  75 }
  76
  77 size_t
  78 mdb_addrvec_length(mdb_addrvec_t *adp)
  79 {
  80         if (adp != NULL) {
  81                 ASSERT(adp->ad_nelems >= adp->ad_ndx);
  82                 return (adp->ad_nelems - adp->ad_ndx);
  83         }
  84
  85         return (0); /* convenience for callers */
  86 }