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      1 /*	$NetBSD: dwarf_abbrev.c,v 1.5 2024/03/03 17:37:30 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009,2011 Kai Wang
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "_libdwarf.h"
     30 
     31 __RCSID("$NetBSD: dwarf_abbrev.c,v 1.5 2024/03/03 17:37:30 christos Exp $");
     32 ELFTC_VCSID("Id: dwarf_abbrev.c 2072 2011-10-27 03:26:49Z jkoshy");
     33 
     34 int
     35 dwarf_get_abbrev(Dwarf_Debug dbg, Dwarf_Unsigned offset,
     36     Dwarf_Abbrev *return_abbrev, Dwarf_Unsigned *length,
     37     Dwarf_Unsigned *attr_count, Dwarf_Error *error)
     38 {
     39 	Dwarf_Abbrev ab;
     40 	int ret;
     41 
     42 	if (dbg == NULL || return_abbrev == NULL || length == NULL ||
     43 	    attr_count == NULL) {
     44 		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
     45 		return (DW_DLV_ERROR);
     46 	}
     47 
     48 	ret = _dwarf_abbrev_parse(dbg, NULL, &offset, &ab, error);
     49 	if (ret != DW_DLE_NONE) {
     50 		if (ret == DW_DLE_NO_ENTRY) {
     51 			DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
     52 			return (DW_DLV_NO_ENTRY);
     53 		} else
     54 			return (DW_DLV_ERROR);
     55 	}
     56 
     57 	*return_abbrev = ab;
     58 	*length = ab->ab_length;
     59 	*attr_count = ab->ab_atnum;
     60 
     61 	return (DW_DLV_OK);
     62 }
     63 
     64 int
     65 dwarf_get_abbrev_tag(Dwarf_Abbrev abbrev, Dwarf_Half *return_tag,
     66     Dwarf_Error *error)
     67 {
     68 
     69 	if (abbrev == NULL || return_tag == NULL) {
     70 		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
     71 		return (DW_DLV_ERROR);
     72 	}
     73 
     74 	*return_tag = (Dwarf_Half) abbrev->ab_tag;
     75 
     76 	return (DW_DLV_OK);
     77 }
     78 
     79 int
     80 dwarf_get_abbrev_code(Dwarf_Abbrev abbrev, Dwarf_Unsigned *return_code,
     81     Dwarf_Error *error)
     82 {
     83 
     84 	if (abbrev == NULL || return_code == NULL) {
     85 		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
     86 		return (DW_DLV_ERROR);
     87 	}
     88 
     89 	*return_code = abbrev->ab_entry;
     90 
     91 	return (DW_DLV_OK);
     92 }
     93 
     94 int
     95 dwarf_get_abbrev_children_flag(Dwarf_Abbrev abbrev, Dwarf_Signed *return_flag,
     96     Dwarf_Error *error)
     97 {
     98 
     99 	if (abbrev == NULL || return_flag == NULL) {
    100 		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
    101 		return (DW_DLV_ERROR);
    102 	}
    103 
    104 	*return_flag = (Dwarf_Signed) abbrev->ab_children;
    105 
    106 	return (DW_DLV_OK);
    107 }
    108 
    109 int
    110 dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx,
    111     Dwarf_Half *attr_num, Dwarf_Signed *form, Dwarf_Off *offset,
    112     Dwarf_Error *error)
    113 {
    114 	Dwarf_AttrDef ad;
    115 	int i;
    116 
    117 	if (abbrev == NULL || attr_num == NULL || form == NULL ||
    118 	    offset == NULL) {
    119 		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
    120 		return (DW_DLV_ERROR);
    121 	}
    122 
    123 	if (ndx < 0 || (uint64_t) ndx >= abbrev->ab_atnum) {
    124 		DWARF_SET_ERROR(NULL, error, DW_DLE_NO_ENTRY);
    125 		return (DW_DLV_NO_ENTRY);
    126 	}
    127 
    128 	ad = STAILQ_FIRST(&abbrev->ab_attrdef);
    129 	for (i = 0; i < ndx && ad != NULL; i++)
    130 		ad = STAILQ_NEXT(ad, ad_next);
    131 
    132 	assert(ad != NULL);
    133 
    134 	*attr_num = ad->ad_attrib;
    135 	*form = ad->ad_form;
    136 	*offset = ad->ad_offset;
    137 
    138 	return (DW_DLV_OK);
    139 }
    140