1 /* Release debugging handling context.
2 Copyright (C) 2002-2011, 2014, 2018 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <search.h>
35 #include <stdlib.h>
36 #include <assert.h>
37 #include <string.h>
38 #include <unistd.h>
39
40 #include "libdwP.h"
41 #include "cfi.h"
42
43
44 static void
noop_free(void * arg)45 noop_free (void *arg __attribute__ ((unused)))
46 {
47 }
48
49
50 static void
cu_free(void * arg)51 cu_free (void *arg)
52 {
53 struct Dwarf_CU *p = (struct Dwarf_CU *) arg;
54
55 Dwarf_Abbrev_Hash_free (&p->abbrev_hash);
56
57 tdestroy (p->locs, noop_free);
58
59 /* Free split dwarf one way (from skeleton to split). */
60 if (p->unit_type == DW_UT_skeleton
61 && p->split != NULL && p->split != (void *)-1)
62 {
63 /* The fake_addr_cu might be shared, only release one. */
64 if (p->dbg->fake_addr_cu == p->split->dbg->fake_addr_cu)
65 p->split->dbg->fake_addr_cu = NULL;
66 INTUSE(dwarf_end) (p->split->dbg);
67 }
68 }
69
70
71 int
dwarf_end(Dwarf * dwarf)72 dwarf_end (Dwarf *dwarf)
73 {
74 if (dwarf != NULL)
75 {
76 if (dwarf->cfi != NULL)
77 /* Clean up the CFI cache. */
78 __libdw_destroy_frame_cache (dwarf->cfi);
79
80 Dwarf_Sig8_Hash_free (&dwarf->sig8_hash);
81
82 /* The search tree for the CUs. NB: the CU data itself is
83 allocated separately, but the abbreviation hash tables need
84 to be handled. */
85 tdestroy (dwarf->cu_tree, cu_free);
86 tdestroy (dwarf->tu_tree, cu_free);
87
88 /* Search tree for macro opcode tables. */
89 tdestroy (dwarf->macro_ops, noop_free);
90
91 /* Search tree for decoded .debug_lines units. */
92 tdestroy (dwarf->files_lines, noop_free);
93
94 /* And the split Dwarf. */
95 tdestroy (dwarf->split_tree, noop_free);
96
97 struct libdw_memblock *memp = dwarf->mem_tail;
98 /* The first block is allocated together with the Dwarf object. */
99 while (memp->prev != NULL)
100 {
101 struct libdw_memblock *prevp = memp->prev;
102 free (memp);
103 memp = prevp;
104 }
105
106 /* Free the pubnames helper structure. */
107 free (dwarf->pubnames_sets);
108
109 /* Free the ELF descriptor if necessary. */
110 if (dwarf->free_elf)
111 elf_end (dwarf->elf);
112
113 /* Free the fake location list CU. */
114 if (dwarf->fake_loc_cu != NULL)
115 {
116 cu_free (dwarf->fake_loc_cu);
117 free (dwarf->fake_loc_cu);
118 }
119 if (dwarf->fake_loclists_cu != NULL)
120 {
121 cu_free (dwarf->fake_loclists_cu);
122 free (dwarf->fake_loclists_cu);
123 }
124 if (dwarf->fake_addr_cu != NULL)
125 {
126 cu_free (dwarf->fake_addr_cu);
127 free (dwarf->fake_addr_cu);
128 }
129
130 /* Did we find and allocate the alt Dwarf ourselves? */
131 if (dwarf->alt_fd != -1)
132 {
133 INTUSE(dwarf_end) (dwarf->alt_dwarf);
134 close (dwarf->alt_fd);
135 }
136
137 /* The cached dir we found the Dwarf ELF file in. */
138 free (dwarf->debugdir);
139
140 /* Free the context descriptor. */
141 free (dwarf);
142 }
143
144 return 0;
145 }
146 INTDEF(dwarf_end)
147