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148 lines
4.2 KiB
148 lines
4.2 KiB
/* Find the split (or skeleton) unit for a given unit.
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Copyright (C) 2018 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libdwP.h"
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#include "libelfP.h"
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#include <limits.h>
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#include <search.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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void
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try_split_file (Dwarf_CU *cu, const char *dwo_path)
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{
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int split_fd = open (dwo_path, O_RDONLY);
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if (split_fd != -1)
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{
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Dwarf *split_dwarf = dwarf_begin (split_fd, DWARF_C_READ);
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if (split_dwarf != NULL)
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{
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Dwarf_CU *split = NULL;
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while (dwarf_get_units (split_dwarf, split, &split,
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NULL, NULL, NULL, NULL) == 0)
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{
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if (split->unit_type == DW_UT_split_compile
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&& cu->unit_id8 == split->unit_id8)
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{
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if (tsearch (split->dbg, &cu->dbg->split_tree,
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__libdw_finddbg_cb) == NULL)
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{
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/* Something went wrong. Don't link. */
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__libdw_seterrno (DWARF_E_NOMEM);
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break;
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}
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/* Link skeleton and split compile units. */
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__libdw_link_skel_split (cu, split);
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/* We have everything we need from this ELF
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file. And we are going to close the fd to
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not run out of file descriptors. */
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elf_cntl (split_dwarf->elf, ELF_C_FDDONE);
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break;
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}
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}
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if (cu->split == (Dwarf_CU *) -1)
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dwarf_end (split_dwarf);
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}
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/* Always close, because we don't want to run out of file
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descriptors. See also the elf_fcntl ELF_C_FDDONE call
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above. */
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close (split_fd);
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}
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}
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Dwarf_CU *
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internal_function
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__libdw_find_split_unit (Dwarf_CU *cu)
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{
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/* Only try once. */
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if (cu->split != (Dwarf_CU *) -1)
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return cu->split;
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/* We need a skeleton unit with a comp_dir and [GNU_]dwo_name attributes.
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The split unit will be the first in the dwo file and should have the
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same id as the skeleton. */
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if (cu->unit_type == DW_UT_skeleton)
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{
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Dwarf_Die cudie = CUDIE (cu);
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Dwarf_Attribute dwo_name;
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/* It is fine if dwo_dir doesn't exists, but then dwo_name needs
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to be an absolute path. */
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if (dwarf_attr (&cudie, DW_AT_dwo_name, &dwo_name) != NULL
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|| dwarf_attr (&cudie, DW_AT_GNU_dwo_name, &dwo_name) != NULL)
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{
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/* First try the dwo file name in the same directory
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as we found the skeleton file. */
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const char *dwo_file = dwarf_formstring (&dwo_name);
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const char *debugdir = cu->dbg->debugdir;
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char *dwo_path = __libdw_filepath (debugdir, NULL, dwo_file);
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if (dwo_path != NULL)
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{
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try_split_file (cu, dwo_path);
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free (dwo_path);
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}
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if (cu->split == (Dwarf_CU *) -1)
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{
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/* Try compdir plus dwo_name. */
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Dwarf_Attribute compdir;
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dwarf_attr (&cudie, DW_AT_comp_dir, &compdir);
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const char *dwo_dir = dwarf_formstring (&compdir);
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if (dwo_dir != NULL)
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{
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dwo_path = __libdw_filepath (debugdir, dwo_dir, dwo_file);
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if (dwo_path != NULL)
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{
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try_split_file (cu, dwo_path);
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free (dwo_path);
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}
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}
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}
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/* XXX If still not found we could try stripping dirs from the
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comp_dir and adding them from the comp_dir, assuming
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someone moved a whole build tree around. */
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}
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}
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/* If we found nothing, make sure we don't try again. */
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if (cu->split == (Dwarf_CU *) -1)
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cu->split = NULL;
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return cu->split;
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}
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