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00b400574a
Using std::string here makes the string building simpler thank playing with char*. A stack allocation is replaced with heap allocation, but I don't think this is really performance-critical code. gdb/ChangeLog: * build-id.c (build_id_to_debug_bfd): Use std::string.
154 lines
3.9 KiB
C
154 lines
3.9 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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gdb_bfd_ref_ptr abfd;
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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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std::vector<gdb::unique_xmalloc_ptr<char>> debugdir_vec
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= dirnames_to_char_ptr_vec (debug_file_directory);
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for (const gdb::unique_xmalloc_ptr<char> &debugdir : debugdir_vec)
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{
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const gdb_byte *data = build_id;
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size_t size = build_id_len;
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std::string link = debugdir.get ();
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link += "/.build-id/";
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if (size > 0)
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{
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size--;
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string_appendf (link, "%02x/", (unsigned) *data++);
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}
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while (size-- > 0)
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string_appendf (link, "%02x", (unsigned) *data++);
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link += ".debug";
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if (separate_debug_file_debug)
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printf_unfiltered (_(" Trying %s\n"), link.c_str ());
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/* lrealpath() is expensive even for the usually non-existent files. */
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gdb::unique_xmalloc_ptr<char> filename;
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if (access (link.c_str (), F_OK) == 0)
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filename.reset (lrealpath (link.c_str ()));
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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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abfd = gdb_bfd_open (filename.get (), gnutarget, -1);
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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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return abfd;
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}
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/* See build-id.h. */
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std::string
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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 std::string (bfd_get_filename (abfd.get ()));
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}
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return std::string ();
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}
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