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 tdestroy (p->locs, noop_free);
56
57 /* Only free the CU internals if its not a fake CU. */
58 if(p != p->dbg->fake_loc_cu && p != p->dbg->fake_loclists_cu
59 && p != p->dbg->fake_addr_cu)
60 {
61 Dwarf_Abbrev_Hash_free (&p->abbrev_hash);
62
63 /* Free split dwarf one way (from skeleton to split). */
64 if (p->unit_type == DW_UT_skeleton
65 && p->split != NULL && p->split != (void *)-1)
66 {
67 /* The fake_addr_cu might be shared, only release one. */
68 if (p->dbg->fake_addr_cu == p->split->dbg->fake_addr_cu)
69 p->split->dbg->fake_addr_cu = NULL;
70 INTUSE(dwarf_end) (p->split->dbg);
71 }
72 }
73 }
74
75
76 int
dwarf_end(Dwarf * dwarf)77 dwarf_end (Dwarf *dwarf)
78 {
79 if (dwarf != NULL)
80 {
81 if (dwarf->cfi != NULL)
82 /* Clean up the CFI cache. */
83 __libdw_destroy_frame_cache (dwarf->cfi);
84
85 Dwarf_Sig8_Hash_free (&dwarf->sig8_hash);
86
87 /* The search tree for the CUs. NB: the CU data itself is
88 allocated separately, but the abbreviation hash tables need
89 to be handled. */
90 tdestroy (dwarf->cu_tree, cu_free);
91 tdestroy (dwarf->tu_tree, cu_free);
92
93 /* Search tree for macro opcode tables. */
94 tdestroy (dwarf->macro_ops, noop_free);
95
96 /* Search tree for decoded .debug_lines units. */
97 tdestroy (dwarf->files_lines, noop_free);
98
99 /* And the split Dwarf. */
100 tdestroy (dwarf->split_tree, noop_free);
101
102 /* Free the internally allocated memory. */
103 for (size_t i = 0; i < dwarf->mem_stacks; i++)
104 {
105 struct libdw_memblock *memp = dwarf->mem_tails[i];
106 while (memp != NULL)
107 {
108 struct libdw_memblock *prevp = memp->prev;
109 free (memp);
110 memp = prevp;
111 }
112 }
113 if (dwarf->mem_tails != NULL)
114 free (dwarf->mem_tails);
115 pthread_rwlock_destroy (&dwarf->mem_rwl);
116
117 /* Free the pubnames helper structure. */
118 free (dwarf->pubnames_sets);
119
120 /* Free the ELF descriptor if necessary. */
121 if (dwarf->free_elf)
122 elf_end (dwarf->elf);
123
124 /* Free the fake location list CU. */
125 if (dwarf->fake_loc_cu != NULL)
126 {
127 cu_free (dwarf->fake_loc_cu);
128 free (dwarf->fake_loc_cu);
129 }
130 if (dwarf->fake_loclists_cu != NULL)
131 {
132 cu_free (dwarf->fake_loclists_cu);
133 free (dwarf->fake_loclists_cu);
134 }
135 if (dwarf->fake_addr_cu != NULL)
136 {
137 cu_free (dwarf->fake_addr_cu);
138 free (dwarf->fake_addr_cu);
139 }
140
141 /* Did we find and allocate the alt Dwarf ourselves? */
142 if (dwarf->alt_fd != -1)
143 {
144 INTUSE(dwarf_end) (dwarf->alt_dwarf);
145 close (dwarf->alt_fd);
146 }
147
148 /* The cached dir we found the Dwarf ELF file in. */
149 free (dwarf->debugdir);
150
151 /* Free the context descriptor. */
152 free (dwarf);
153 }
154
155 return 0;
156 }
157 INTDEF(dwarf_end)
158