gdb/build-id.h

/* build-id-related functions.

   Copyright (C) 1991-2025 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef GDB_BUILD_ID_H
#define GDB_BUILD_ID_H

#include "gdb_bfd.h"
#include "gdbsupport/rsp-low.h"

/* Locate NT_GNU_BUILD_ID from ABFD and return its content.  */

extern const struct bfd_build_id *build_id_bfd_get (bfd *abfd);

/* Return true if ABFD has NT_GNU_BUILD_ID matching the CHECK value.
   Otherwise, issue a warning and return false.  */

extern int build_id_verify (bfd *abfd,
			    size_t check_len, const bfd_byte *check);


/* Find and open a BFD for a debuginfo file  given a build-id.  If no BFD
   can be found, return NULL.  */

extern gdb_bfd_ref_ptr build_id_to_debug_bfd (size_t build_id_len,
					      const bfd_byte *build_id);

/* Find the separate debug file for OBJFILE, by using the build-id
   associated with OBJFILE's BFD.  If successful, returns the file name for the
   separate debug file, otherwise, return an empty string.

   Any warnings that are generated by the lookup process should be added to
   WARNINGS.  If some other mechanism can be used to lookup the debug
   information then the warning will not be shown, however, if GDB fails to
   find suitable debug information using any approach, then any warnings
   will be printed.  */

extern std::string find_separate_debug_file_by_buildid
  (struct objfile *objfile, deferred_warnings *warnings);

/* Find an objfile (executable or shared library) that matches BUILD_ID.
   This is done by first checking in the debug-file-directory for a
   suitable .build-id/ sub-directory, and looking for a file with the
   required build-id (usually a symbolic link or hard link to the actual
   file).

   If that doesn't find us a file then we call to debuginfod to see if it
   can provide the required file.

   EXPECTED_FILENAME is used in output messages from debuginfod, this
   should be the file we were looking for but couldn't find.  */

extern gdb_bfd_ref_ptr find_objfile_by_build_id
  (struct program_space *pspace, const bfd_build_id *build_id,
   const char *expected_filename);

/* Return an hex-string representation of BUILD_ID.  */

static inline std::string
build_id_to_string (const bfd_build_id *build_id)
{
  gdb_assert (build_id != NULL);

  return bin2hex (build_id->data, build_id->size);
}

/* Compare the content of two build-ids.  One build-id (A) is passed as a
   build-id pointer, while the second is passed using BUILD_ID_LEN and
   BUILD_ID_DATA.  Return true if the build-ids match, otherwise false.  */

static inline bool
build_id_equal (const bfd_build_id *a, const bfd_size_type build_id_len,
		const bfd_byte *build_id_data)
{
  gdb_assert (a != nullptr);
  gdb_assert (build_id_data != nullptr);

  return (a->size == build_id_len
	  && memcmp (a->data, build_id_data, a->size) == 0);
}

/* Like the above, but take two build-id pointers A and B.  */

static inline bool
build_id_equal (const bfd_build_id *a, const bfd_build_id *b)
{
  gdb_assert (a != nullptr);
  gdb_assert (b != nullptr);

  return build_id_equal (a, b->size, b->data);
}

#endif /* GDB_BUILD_ID_H */