1 /* build-id-related functions.
3 Copyright (C) 1991-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "filenames.h"
32 const struct bfd_build_id *
33 build_id_bfd_get (bfd *abfd)
35 if (!bfd_check_format (abfd, bfd_object))
38 if (abfd->build_id != NULL)
39 return abfd->build_id;
48 build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check)
50 const struct bfd_build_id *found;
53 found = build_id_bfd_get (abfd);
56 warning (_("File \"%s\" has no build-id, file skipped"),
57 bfd_get_filename (abfd));
58 else if (found->size != check_len
59 || memcmp (found->data, check, found->size) != 0)
60 warning (_("File \"%s\" has a different build-id, file skipped"),
61 bfd_get_filename (abfd));
71 build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
73 char *link, *debugdir;
74 VEC (char_ptr) *debugdir_vec;
75 struct cleanup *back_to;
80 /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
81 alloc_len = (strlen (debug_file_directory)
82 + (sizeof "/.build-id/" - 1) + 1
83 + 2 * build_id_len + (sizeof ".debug" - 1) + 1);
84 link = (char *) alloca (alloc_len);
86 /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
87 cause "/.build-id/..." lookups. */
89 debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
90 back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);
92 for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
94 size_t debugdir_len = strlen (debugdir);
95 const gdb_byte *data = build_id;
96 size_t size = build_id_len;
98 char *filename = NULL;
99 struct cleanup *inner;
101 memcpy (link, debugdir, debugdir_len);
102 s = &link[debugdir_len];
103 s += sprintf (s, "/.build-id/");
107 s += sprintf (s, "%02x", (unsigned) *data++);
112 s += sprintf (s, "%02x", (unsigned) *data++);
113 strcpy (s, ".debug");
115 /* lrealpath() is expensive even for the usually non-existent files. */
116 if (access (link, F_OK) == 0)
117 filename = lrealpath (link);
119 if (filename == NULL)
122 /* We expect to be silent on the non-existing files. */
123 inner = make_cleanup (xfree, filename);
124 abfd = gdb_bfd_open (filename, gnutarget, -1);
130 if (build_id_verify (abfd, build_id_len, build_id))
133 gdb_bfd_unref (abfd);
137 do_cleanups (back_to);
141 /* See build-id.h. */
144 find_separate_debug_file_by_buildid (struct objfile *objfile)
146 const struct bfd_build_id *build_id;
148 build_id = build_id_bfd_get (objfile->obfd);
149 if (build_id != NULL)
153 abfd = build_id_to_debug_bfd (build_id->size, build_id->data);
154 /* Prevent looping on a stripped .debug file. */
156 && filename_cmp (bfd_get_filename (abfd),
157 objfile_name (objfile)) == 0)
159 warning (_("\"%s\": separate debug info file has no debug info"),
160 bfd_get_filename (abfd));
161 gdb_bfd_unref (abfd);
163 else if (abfd != NULL)
165 char *result = xstrdup (bfd_get_filename (abfd));
167 gdb_bfd_unref (abfd);