170 lines
4.4 KiB
C
170 lines
4.4 KiB
C
/* build-id-related functions.
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Copyright (C) 1991-2018 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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#include "defs.h"
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#include "bfd.h"
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#include "gdb_bfd.h"
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#include "build-id.h"
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#include "gdb_vecs.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "filenames.h"
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#include "gdbcore.h"
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/* See build-id.h. */
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const struct bfd_build_id *
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build_id_bfd_get (bfd *abfd)
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{
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if (!bfd_check_format (abfd, bfd_object))
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return NULL;
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if (abfd->build_id != NULL)
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return abfd->build_id;
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/* No build-id */
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return NULL;
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}
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/* See build-id.h. */
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int
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build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check)
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{
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const struct bfd_build_id *found;
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int retval = 0;
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found = build_id_bfd_get (abfd);
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if (found == NULL)
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warning (_("File \"%s\" has no build-id, file skipped"),
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bfd_get_filename (abfd));
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else if (found->size != check_len
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|| memcmp (found->data, check, found->size) != 0)
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warning (_("File \"%s\" has a different build-id, file skipped"),
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bfd_get_filename (abfd));
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else
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retval = 1;
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return retval;
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}
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/* See build-id.h. */
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gdb_bfd_ref_ptr
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build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
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{
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char *link, *debugdir;
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VEC (char_ptr) *debugdir_vec;
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struct cleanup *back_to;
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int ix;
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gdb_bfd_ref_ptr abfd;
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int alloc_len;
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/* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
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alloc_len = (strlen (debug_file_directory)
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+ (sizeof "/.build-id/" - 1) + 1
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+ 2 * build_id_len + (sizeof ".debug" - 1) + 1);
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link = (char *) alloca (alloc_len);
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/* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
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cause "/.build-id/..." lookups. */
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debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
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back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);
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for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
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{
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size_t debugdir_len = strlen (debugdir);
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const gdb_byte *data = build_id;
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size_t size = build_id_len;
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char *s;
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char *filename = NULL;
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struct cleanup *inner;
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memcpy (link, debugdir, debugdir_len);
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s = &link[debugdir_len];
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s += sprintf (s, "/.build-id/");
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if (size > 0)
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{
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size--;
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s += sprintf (s, "%02x", (unsigned) *data++);
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}
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if (size > 0)
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*s++ = '/';
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while (size-- > 0)
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s += sprintf (s, "%02x", (unsigned) *data++);
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strcpy (s, ".debug");
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if (separate_debug_file_debug)
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printf_unfiltered (_(" Trying %s\n"), link);
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/* lrealpath() is expensive even for the usually non-existent files. */
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if (access (link, F_OK) == 0)
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filename = lrealpath (link);
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if (filename == NULL)
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continue;
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/* We expect to be silent on the non-existing files. */
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inner = make_cleanup (xfree, filename);
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abfd = gdb_bfd_open (filename, gnutarget, -1);
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do_cleanups (inner);
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if (abfd == NULL)
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continue;
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if (build_id_verify (abfd.get(), build_id_len, build_id))
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break;
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abfd.release ();
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}
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do_cleanups (back_to);
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return abfd;
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}
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/* See build-id.h. */
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char *
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find_separate_debug_file_by_buildid (struct objfile *objfile)
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{
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const struct bfd_build_id *build_id;
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build_id = build_id_bfd_get (objfile->obfd);
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if (build_id != NULL)
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{
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if (separate_debug_file_debug)
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printf_unfiltered (_("\nLooking for separate debug info (build-id) for "
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"%s\n"), objfile_name (objfile));
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gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size,
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build_id->data));
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/* Prevent looping on a stripped .debug file. */
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if (abfd != NULL
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&& filename_cmp (bfd_get_filename (abfd.get ()),
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objfile_name (objfile)) == 0)
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warning (_("\"%s\": separate debug info file has no debug info"),
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bfd_get_filename (abfd.get ()));
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else if (abfd != NULL)
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return xstrdup (bfd_get_filename (abfd.get ()));
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}
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return NULL;
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}
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