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
39 #include "libdwP.h"
40 #include "cfi.h"
41
42
43 static void
noop_free(void * arg)44 noop_free (void *arg __attribute__ ((unused)))
45 {
46 }
47
48
49 static void
cu_free(void * arg)50 cu_free (void *arg)
51 {
52 struct Dwarf_CU *p = (struct Dwarf_CU *) arg;
53
54 tdestroy (p->locs, noop_free);
55
56 /* Only free the CU internals if its not a fake CU. */
57 if(p != p->dbg->fake_loc_cu && p != p->dbg->fake_loclists_cu
58 && p != p->dbg->fake_addr_cu)
59 {
60 Dwarf_Abbrev_Hash_free (&p->abbrev_hash);
61
62 /* Free split dwarf one way (from skeleton to split). */
63 if (p->unit_type == DW_UT_skeleton
64 && p->split != NULL && p->split != (void *)-1)
65 {
66 /* The fake_addr_cu might be shared, only release one. */
67 if (p->dbg->fake_addr_cu == p->split->dbg->fake_addr_cu)
68 p->split->dbg->fake_addr_cu = NULL;
69 INTUSE(dwarf_end) (p->split->dbg);
70 }
71 }
72 }
73
74
75 int
dwarf_end(Dwarf * dwarf)76 dwarf_end (Dwarf *dwarf)
77 {
78 if (dwarf != NULL)
79 {
80 if (dwarf->cfi != NULL)
81 /* Clean up the CFI cache. */
82 __libdw_destroy_frame_cache (dwarf->cfi);
83
84 Dwarf_Sig8_Hash_free (&dwarf->sig8_hash);
85
86 /* The search tree for the CUs. NB: the CU data itself is
87 allocated separately, but the abbreviation hash tables need
88 to be handled. */
89 tdestroy (dwarf->cu_tree, cu_free);
90 tdestroy (dwarf->tu_tree, cu_free);
91
92 /* Search tree for macro opcode tables. */
93 tdestroy (dwarf->macro_ops, noop_free);
94
95 /* Search tree for decoded .debug_lines units. */
96 tdestroy (dwarf->files_lines, noop_free);
97
98 /* And the split Dwarf. */
99 tdestroy (dwarf->split_tree, noop_free);
100
101 /* Free the internally allocated memory. */
102 for (size_t i = 0; i < dwarf->mem_stacks; i++)
103 {
104 struct libdw_memblock *memp = dwarf->mem_tails[i];
105 while (memp != NULL)
106 {
107 struct libdw_memblock *prevp = memp->prev;
108 free (memp);
109 memp = prevp;
110 }
111 }
112 if (dwarf->mem_tails != NULL)
113 free (dwarf->mem_tails);
114 pthread_rwlock_destroy (&dwarf->mem_rwl);
115
116 /* Free the pubnames helper structure. */
117 free (dwarf->pubnames_sets);
118
119 /* Free the ELF descriptor if necessary. */
120 if (dwarf->free_elf)
121 elf_end (dwarf->elf);
122
123 /* Free the fake location list CU. */
124 if (dwarf->fake_loc_cu != NULL)
125 {
126 cu_free (dwarf->fake_loc_cu);
127 free (dwarf->fake_loc_cu);
128 }
129 if (dwarf->fake_loclists_cu != NULL)
130 {
131 cu_free (dwarf->fake_loclists_cu);
132 free (dwarf->fake_loclists_cu);
133 }
134 if (dwarf->fake_addr_cu != NULL)
135 {
136 cu_free (dwarf->fake_addr_cu);
137 free (dwarf->fake_addr_cu);
138 }
139
140 /* Did we find and allocate the alt Dwarf ourselves? */
141 if (dwarf->alt_fd != -1)
142 {
143 INTUSE(dwarf_end) (dwarf->alt_dwarf);
144 close (dwarf->alt_fd);
145 }
146
147 /* The cached dir we found the Dwarf ELF file in. */
148 free (dwarf->debugdir);
149
150 /* Free the context descriptor. */
151 free (dwarf);
152 }
153
154 return 0;
155 }
156 INTDEF(dwarf_end)
157