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ef1a41f20b
Add a new ext_lang_find_objfile_from_buildid function which is called from find_objfile_by_build_id and gives extension languages a chance to find missing objfiles. This commit adds the ext_lang_find_objfile_from_buildid function and the extension_language_ops::find_objfile_from_buildid() hook, but does not implement the hook for any extension languages, that will come in the next commit. This commit does rewrite find_objfile_by_build_id (build-id.c) to call the new hook though. The basic steps of find_objfile_by_build_id are now this: 1. Try to find the missing objfile using the build-id by looking in the debug-file-directory's .build-id/ sub-directory. If we find the file then we're done. 2. Ask debuginfod to download the missing file for us. If we download the file successfully then we're done. 3. Ask the extension language hook to find the file for us. If the extension language asks us to try again then we repeat step (1) only and if we still don't have the file, we move to step (4). If the extension language told us where the file is then we use that file and we're done. 4. We didn't find the file. Carry on without it. Only step (3) is new in this logic, everything else was already done. There are no tests added here as we can't currently write an extension language callback. The next commit will add the tests. Approved-By: Tom Tromey <tom@tromey.com>
109 lines
3.7 KiB
C++
109 lines
3.7 KiB
C++
/* build-id-related functions.
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Copyright (C) 1991-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef BUILD_ID_H
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#define BUILD_ID_H
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#include "gdb_bfd.h"
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#include "gdbsupport/rsp-low.h"
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/* Locate NT_GNU_BUILD_ID from ABFD and return its content. */
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extern const struct bfd_build_id *build_id_bfd_get (bfd *abfd);
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/* Return true if ABFD has NT_GNU_BUILD_ID matching the CHECK value.
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Otherwise, issue a warning and return false. */
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extern int build_id_verify (bfd *abfd,
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size_t check_len, const bfd_byte *check);
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/* Find and open a BFD for a debuginfo file given a build-id. If no BFD
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can be found, return NULL. */
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extern gdb_bfd_ref_ptr build_id_to_debug_bfd (size_t build_id_len,
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const bfd_byte *build_id);
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/* Find the separate debug file for OBJFILE, by using the build-id
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associated with OBJFILE's BFD. If successful, returns the file name for the
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separate debug file, otherwise, return an empty string.
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Any warnings that are generated by the lookup process should be added to
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WARNINGS. If some other mechanism can be used to lookup the debug
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information then the warning will not be shown, however, if GDB fails to
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find suitable debug information using any approach, then any warnings
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will be printed. */
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extern std::string find_separate_debug_file_by_buildid
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(struct objfile *objfile, deferred_warnings *warnings);
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/* Find an objfile (executable or shared library) that matches BUILD_ID.
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This is done by first checking in the debug-file-directory for a
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suitable .build-id/ sub-directory, and looking for a file with the
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required build-id (usually a symbolic link or hard link to the actual
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file).
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If that doesn't find us a file then we call to debuginfod to see if it
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can provide the required file.
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EXPECTED_FILENAME is used in output messages from debuginfod, this
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should be the file we were looking for but couldn't find. */
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extern gdb_bfd_ref_ptr find_objfile_by_build_id
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(struct program_space *pspace, const bfd_build_id *build_id,
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const char *expected_filename);
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/* Return an hex-string representation of BUILD_ID. */
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static inline std::string
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build_id_to_string (const bfd_build_id *build_id)
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{
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gdb_assert (build_id != NULL);
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return bin2hex (build_id->data, build_id->size);
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}
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/* Compare the content of two build-ids. One build-id (A) is passed as a
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build-id pointer, while the second is passed using BUILD_ID_LEN and
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BUILD_ID_DATA. Return true if the build-ids match, otherwise false. */
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static inline bool
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build_id_equal (const bfd_build_id *a, const bfd_size_type build_id_len,
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const bfd_byte *build_id_data)
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{
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gdb_assert (a != nullptr);
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gdb_assert (build_id_data != nullptr);
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return (a->size == build_id_len
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&& memcmp (a->data, build_id_data, a->size) == 0);
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}
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/* Like the above, but take two build-id pointers A and B. */
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static inline bool
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build_id_equal (const bfd_build_id *a, const bfd_build_id *b)
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{
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gdb_assert (a != nullptr);
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gdb_assert (b != nullptr);
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return build_id_equal (a, b->size, b->data);
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}
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#endif /* BUILD_ID_H */
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