1/*-
2 * Copyright (c) 2007 John Birrell (jb@freebsd.org)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "_libdwarf.h"
28
29ELFTC_VCSID("$Id: dwarf_dealloc.c 2073 2011-10-27 03:30:47Z jkoshy $");
30
31void
32dwarf_dealloc(Dwarf_Debug dbg, Dwarf_Ptr p, Dwarf_Unsigned alloc_type)
33{
34	Dwarf_Abbrev ab;
35	Dwarf_AttrDef ad, tad;
36	Dwarf_Attribute at, tat;
37	Dwarf_Die die;
38
39	/*
40	 * This libdwarf implementation does not use the SGI/libdwarf
41	 * style of memory allocation. In most cases it does not copy
42	 * things to return to the client, so the client does not need
43	 * to remember to free them.  The remaining cases are handled
44	 * below.
45	 */
46
47	(void) dbg;
48
49	if (alloc_type == DW_DLA_LIST || alloc_type == DW_DLA_FRAME_BLOCK ||
50	    alloc_type == DW_DLA_LOC_BLOCK || alloc_type == DW_DLA_LOCDESC)
51		free(p);
52	else if (alloc_type == DW_DLA_ABBREV) {
53		ab = p;
54		STAILQ_FOREACH_SAFE(ad, &ab->ab_attrdef, ad_next, tad) {
55			STAILQ_REMOVE(&ab->ab_attrdef, ad, _Dwarf_AttrDef,
56			    ad_next);
57			free(ad);
58		}
59		free(ab);
60	} else if (alloc_type == DW_DLA_DIE) {
61		die = p;
62		STAILQ_FOREACH_SAFE(at, &die->die_attr, at_next, tat) {
63			STAILQ_REMOVE(&die->die_attr, at,
64			    _Dwarf_Attribute, at_next);
65			if (at->at_ld != NULL)
66				free(at->at_ld);
67			free(at);
68		}
69		if (die->die_attrarray)
70			free(die->die_attrarray);
71		free(die);
72	}
73}
74
75void
76dwarf_srclines_dealloc(Dwarf_Debug dbg, Dwarf_Line *linebuf,
77	Dwarf_Signed count)
78{
79	/*
80	 * In this libdwarf implementation, line information remains
81	 * associated with the DIE for a compilation unit for the
82	 * lifetime of the DIE.  The client does not need to free
83	 * the memory returned by `dwarf_srclines()`.
84	 */
85
86	(void) dbg; (void) linebuf; (void) count;
87}
88
89void
90dwarf_ranges_dealloc(Dwarf_Debug dbg, Dwarf_Ranges *ranges,
91    Dwarf_Signed range_count)
92{
93	/*
94	 * In this libdwarf implementation, ranges information is
95	 * kept by a STAILQ inside Dwarf_Debug object. The client
96	 * does not need to free the memory returned by
97	 * `dwarf_get_ranges()` or `dwarf_get_ranges_a()`.
98	 */
99
100	(void) dbg; (void) ranges; (void) range_count;
101}
102
103void
104dwarf_fde_cie_list_dealloc(Dwarf_Debug dbg, Dwarf_Cie *cie_list,
105    Dwarf_Signed cie_count, Dwarf_Fde *fde_list, Dwarf_Signed fde_count)
106{
107	/*
108	 * In this implementation, FDE and CIE information is managed
109	 * as part of the Dwarf_Debug object.  The client does not need
110	 * to explicitly free these memory arenas.
111	 */
112	(void) dbg;
113	(void) cie_list;
114	(void) cie_count;
115	(void) fde_list;
116	(void) fde_count;
117}
118