1 /* Maintenance of module list in libdwfl.
2 Copyright (C) 2005, 2006, 2007, 2008 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4
5 Red Hat elfutils is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by the
7 Free Software Foundation; version 2 of the License.
8
9 Red Hat elfutils is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13
14 You should have received a copy of the GNU General Public License along
15 with Red Hat elfutils; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
17
18 In addition, as a special exception, Red Hat, Inc. gives You the
19 additional right to link the code of Red Hat elfutils with code licensed
20 under any Open Source Initiative certified open source license
21 (http://www.opensource.org/licenses/index.php) which requires the
22 distribution of source code with any binary distribution and to
23 distribute linked combinations of the two. Non-GPL Code permitted under
24 this exception must only link to the code of Red Hat elfutils through
25 those well defined interfaces identified in the file named EXCEPTION
26 found in the source code files (the "Approved Interfaces"). The files
27 of Non-GPL Code may instantiate templates or use macros or inline
28 functions from the Approved Interfaces without causing the resulting
29 work to be covered by the GNU General Public License. Only Red Hat,
30 Inc. may make changes or additions to the list of Approved Interfaces.
31 Red Hat's grant of this exception is conditioned upon your not adding
32 any new exceptions. If you wish to add a new Approved Interface or
33 exception, please contact Red Hat. You must obey the GNU General Public
34 License in all respects for all of the Red Hat elfutils code and other
35 code used in conjunction with Red Hat elfutils except the Non-GPL Code
36 covered by this exception. If you modify this file, you may extend this
37 exception to your version of the file, but you are not obligated to do
38 so. If you do not wish to provide this exception without modification,
39 you must delete this exception statement from your version and license
40 this file solely under the GPL without exception.
41
42 Red Hat elfutils is an included package of the Open Invention Network.
43 An included package of the Open Invention Network is a package for which
44 Open Invention Network licensees cross-license their patents. No patent
45 license is granted, either expressly or impliedly, by designation as an
46 included package. Should you wish to participate in the Open Invention
47 Network licensing program, please visit www.openinventionnetwork.com
48 <http://www.openinventionnetwork.com>. */
49
50 #include "libdwflP.h"
51 #include <search.h>
52 #include <unistd.h>
53
54 static void
free_cu(struct dwfl_cu * cu)55 free_cu (struct dwfl_cu *cu)
56 {
57 if (cu->lines != NULL)
58 free (cu->lines);
59 free (cu);
60 }
61
62 static void
nofree(void * arg)63 nofree (void *arg __attribute__ ((unused)))
64 {
65 }
66
67 static void
free_file(struct dwfl_file * file)68 free_file (struct dwfl_file *file)
69 {
70 free (file->name);
71
72 /* Close the fd only on the last reference. */
73 if (file->elf != NULL && elf_end (file->elf) == 0 && file->fd != -1)
74 close (file->fd);
75 }
76
77 void
78 internal_function
__libdwfl_module_free(Dwfl_Module * mod)79 __libdwfl_module_free (Dwfl_Module *mod)
80 {
81 if (mod->lazy_cu_root != NULL)
82 tdestroy (mod->lazy_cu_root, nofree);
83
84 if (mod->aranges != NULL)
85 free (mod->aranges);
86
87 if (mod->cu != NULL)
88 {
89 for (size_t i = 0; i < mod->ncu; ++i)
90 free_cu (mod->cu[i]);
91 free (mod->cu);
92 }
93
94 if (mod->dw != NULL)
95 INTUSE(dwarf_end) (mod->dw);
96
97 if (mod->ebl != NULL)
98 ebl_closebackend (mod->ebl);
99
100 if (mod->debug.elf != mod->main.elf)
101 free_file (&mod->debug);
102 free_file (&mod->main);
103
104 if (mod->build_id_bits != NULL)
105 free (mod->build_id_bits);
106
107 free (mod->name);
108 free (mod);
109 }
110
111 void
dwfl_report_begin_add(Dwfl * dwfl)112 dwfl_report_begin_add (Dwfl *dwfl __attribute__ ((unused)))
113 {
114 /* The lookup table will be cleared on demand, there is nothing we need
115 to do here. */
116 }
INTDEF(dwfl_report_begin_add)117 INTDEF (dwfl_report_begin_add)
118
119 void
120 dwfl_report_begin (Dwfl *dwfl)
121 {
122 /* Clear the segment lookup table. */
123 dwfl->lookup_elts = 0;
124
125 for (Dwfl_Module *m = dwfl->modulelist; m != NULL; m = m->next)
126 m->gc = true;
127
128 dwfl->offline_next_address = OFFLINE_REDZONE;
129 }
INTDEF(dwfl_report_begin)130 INTDEF (dwfl_report_begin)
131
132 /* Report that a module called NAME spans addresses [START, END).
133 Returns the module handle, either existing or newly allocated,
134 or returns a null pointer for an allocation error. */
135 Dwfl_Module *
136 dwfl_report_module (Dwfl *dwfl, const char *name,
137 GElf_Addr start, GElf_Addr end)
138 {
139 Dwfl_Module **tailp = &dwfl->modulelist, **prevp = tailp;
140
141 inline Dwfl_Module *use (Dwfl_Module *mod)
142 {
143 mod->next = *tailp;
144 *tailp = mod;
145
146 if (unlikely (dwfl->lookup_module != NULL))
147 {
148 free (dwfl->lookup_module);
149 dwfl->lookup_module = NULL;
150 }
151
152 return mod;
153 }
154
155 for (Dwfl_Module *m = *prevp; m != NULL; m = *(prevp = &m->next))
156 {
157 if (m->low_addr == start && m->high_addr == end
158 && !strcmp (m->name, name))
159 {
160 /* This module is still here. Move it to the place in the list
161 after the last module already reported. */
162 *prevp = m->next;
163 m->gc = false;
164 return use (m);
165 }
166
167 if (! m->gc)
168 tailp = &m->next;
169 }
170
171 Dwfl_Module *mod = calloc (1, sizeof *mod);
172 if (mod == NULL)
173 goto nomem;
174
175 mod->name = strdup (name);
176 if (mod->name == NULL)
177 {
178 free (mod);
179 nomem:
180 __libdwfl_seterrno (DWFL_E_NOMEM);
181 return NULL;
182 }
183
184 mod->low_addr = start;
185 mod->high_addr = end;
186 mod->dwfl = dwfl;
187
188 return use (mod);
189 }
INTDEF(dwfl_report_module)190 INTDEF (dwfl_report_module)
191
192
193 /* Finish reporting the current set of modules to the library.
194 If REMOVED is not null, it's called for each module that
195 existed before but was not included in the current report.
196 Returns a nonzero return value from the callback.
197 DWFL cannot be used until this function has returned zero. */
198 int
199 dwfl_report_end (Dwfl *dwfl,
200 int (*removed) (Dwfl_Module *, void *,
201 const char *, Dwarf_Addr,
202 void *arg),
203 void *arg)
204 {
205 Dwfl_Module **tailp = &dwfl->modulelist;
206 while (*tailp != NULL)
207 {
208 Dwfl_Module *m = *tailp;
209 if (m->gc && removed != NULL)
210 {
211 int result = (*removed) (MODCB_ARGS (m), arg);
212 if (result != 0)
213 return result;
214 }
215 if (m->gc)
216 {
217 *tailp = m->next;
218 __libdwfl_module_free (m);
219 }
220 else
221 tailp = &m->next;
222 }
223
224 return 0;
225 }
226 INTDEF (dwfl_report_end)
227