1 /* build-id-related functions.
3 Copyright (C) 1991-2018 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
)
75 /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
76 cause "/.build-id/..." lookups. */
78 std::vector
<gdb::unique_xmalloc_ptr
<char>> debugdir_vec
79 = dirnames_to_char_ptr_vec (debug_file_directory
);
81 for (const gdb::unique_xmalloc_ptr
<char> &debugdir
: debugdir_vec
)
83 const gdb_byte
*data
= build_id
;
84 size_t size
= build_id_len
;
86 std::string link
= debugdir
.get ();
87 link
+= "/.build-id/";
92 string_appendf (link
, "%02x/", (unsigned) *data
++);
96 string_appendf (link
, "%02x", (unsigned) *data
++);
100 if (separate_debug_file_debug
)
101 printf_unfiltered (_(" Trying %s\n"), link
.c_str ());
103 /* lrealpath() is expensive even for the usually non-existent files. */
104 gdb::unique_xmalloc_ptr
<char> filename
;
105 if (access (link
.c_str (), F_OK
) == 0)
106 filename
.reset (lrealpath (link
.c_str ()));
108 if (filename
== NULL
)
111 /* We expect to be silent on the non-existing files. */
112 abfd
= gdb_bfd_open (filename
.get (), gnutarget
, -1);
117 if (build_id_verify (abfd
.get(), build_id_len
, build_id
))
126 /* See build-id.h. */
129 find_separate_debug_file_by_buildid (struct objfile
*objfile
)
131 const struct bfd_build_id
*build_id
;
133 build_id
= build_id_bfd_get (objfile
->obfd
);
134 if (build_id
!= NULL
)
136 if (separate_debug_file_debug
)
137 printf_unfiltered (_("\nLooking for separate debug info (build-id) for "
138 "%s\n"), objfile_name (objfile
));
140 gdb_bfd_ref_ptr
abfd (build_id_to_debug_bfd (build_id
->size
,
142 /* Prevent looping on a stripped .debug file. */
144 && filename_cmp (bfd_get_filename (abfd
.get ()),
145 objfile_name (objfile
)) == 0)
146 warning (_("\"%s\": separate debug info file has no debug info"),
147 bfd_get_filename (abfd
.get ()));
148 else if (abfd
!= NULL
)
149 return std::string (bfd_get_filename (abfd
.get ()));
152 return std::string ();