1 /* build-id-related functions.
3 Copyright (C) 1991-2019 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/>. */
22 /* Local non-gdb includes. */
25 #include "common/gdb_vecs.h"
26 #include "filenames.h"
34 const struct bfd_build_id
*
35 build_id_bfd_get (bfd
*abfd
)
37 if (!bfd_check_format (abfd
, bfd_object
))
40 if (abfd
->build_id
!= NULL
)
41 return abfd
->build_id
;
50 build_id_verify (bfd
*abfd
, size_t check_len
, const bfd_byte
*check
)
52 const struct bfd_build_id
*found
;
55 found
= build_id_bfd_get (abfd
);
58 warning (_("File \"%s\" has no build-id, file skipped"),
59 bfd_get_filename (abfd
));
60 else if (found
->size
!= check_len
61 || memcmp (found
->data
, check
, found
->size
) != 0)
62 warning (_("File \"%s\" has a different build-id, file skipped"),
63 bfd_get_filename (abfd
));
70 /* Helper for build_id_to_debug_bfd. LINK is a path to a potential
71 build-id-based separate debug file, potentially a symlink to the real file.
72 If the file exists and matches BUILD_ID, return a BFD reference to it. */
74 static gdb_bfd_ref_ptr
75 build_id_to_debug_bfd_1 (const std::string
&link
, size_t build_id_len
,
76 const bfd_byte
*build_id
)
78 if (separate_debug_file_debug
)
80 printf_unfiltered (_(" Trying %s..."), link
.c_str ());
81 gdb_flush (gdb_stdout
);
84 /* lrealpath() is expensive even for the usually non-existent files. */
85 gdb::unique_xmalloc_ptr
<char> filename
;
86 if (access (link
.c_str (), F_OK
) == 0)
87 filename
.reset (lrealpath (link
.c_str ()));
91 if (separate_debug_file_debug
)
92 printf_unfiltered (_(" no, unable to compute real path\n"));
97 /* We expect to be silent on the non-existing files. */
98 gdb_bfd_ref_ptr debug_bfd
= gdb_bfd_open (filename
.get (), gnutarget
, -1);
100 if (debug_bfd
== NULL
)
102 if (separate_debug_file_debug
)
103 printf_unfiltered (_(" no, unable to open.\n"));
108 if (!build_id_verify (debug_bfd
.get(), build_id_len
, build_id
))
110 if (separate_debug_file_debug
)
111 printf_unfiltered (_(" no, build-id does not match.\n"));
116 if (separate_debug_file_debug
)
117 printf_unfiltered (_(" yes!\n"));
122 /* See build-id.h. */
125 build_id_to_debug_bfd (size_t build_id_len
, const bfd_byte
*build_id
)
127 /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
128 cause "/.build-id/..." lookups. */
130 std::vector
<gdb::unique_xmalloc_ptr
<char>> debugdir_vec
131 = dirnames_to_char_ptr_vec (debug_file_directory
);
133 for (const gdb::unique_xmalloc_ptr
<char> &debugdir
: debugdir_vec
)
135 const gdb_byte
*data
= build_id
;
136 size_t size
= build_id_len
;
138 /* Compute where the file named after the build-id would be.
140 If debugdir is "/usr/lib/debug" and the build-id is abcdef, this will
141 give "/usr/lib/debug/.build-id/ab/cdef.debug". */
142 std::string link
= debugdir
.get ();
143 link
+= "/.build-id/";
148 string_appendf (link
, "%02x/", (unsigned) *data
++);
152 string_appendf (link
, "%02x", (unsigned) *data
++);
156 gdb_bfd_ref_ptr debug_bfd
157 = build_id_to_debug_bfd_1 (link
, build_id_len
, build_id
);
158 if (debug_bfd
!= NULL
)
161 /* Try to look under the sysroot as well. If the sysroot is
162 "/the/sysroot", it will give
163 "/the/sysroot/usr/lib/debug/.build-id/ab/cdef.debug".
165 Don't do it if the sysroot is the target system ("target:"). It
166 could work in theory, but the lrealpath in build_id_to_debug_bfd_1
167 only works with local paths. */
168 if (strcmp (gdb_sysroot
, TARGET_SYSROOT_PREFIX
) != 0)
170 link
= gdb_sysroot
+ link
;
171 debug_bfd
= build_id_to_debug_bfd_1 (link
, build_id_len
, build_id
);
172 if (debug_bfd
!= NULL
)
180 /* See build-id.h. */
183 find_separate_debug_file_by_buildid (struct objfile
*objfile
)
185 const struct bfd_build_id
*build_id
;
187 build_id
= build_id_bfd_get (objfile
->obfd
);
188 if (build_id
!= NULL
)
190 if (separate_debug_file_debug
)
191 printf_unfiltered (_("\nLooking for separate debug info (build-id) for "
192 "%s\n"), objfile_name (objfile
));
194 gdb_bfd_ref_ptr
abfd (build_id_to_debug_bfd (build_id
->size
,
196 /* Prevent looping on a stripped .debug file. */
198 && filename_cmp (bfd_get_filename (abfd
.get ()),
199 objfile_name (objfile
)) == 0)
200 warning (_("\"%s\": separate debug info file has no debug info"),
201 bfd_get_filename (abfd
.get ()));
202 else if (abfd
!= NULL
)
203 return std::string (bfd_get_filename (abfd
.get ()));
206 return std::string ();