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/* Find line information for given file/line/column triple.
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Copyright (C) 2005 Red Hat, Inc.
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This file is part of Red Hat elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2005.
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Red Hat elfutils 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 the
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Free Software Foundation; version 2 of the License.
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Red Hat 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 a copy of the GNU General Public License along
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with Red Hat elfutils; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
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In addition, as a special exception, Red Hat, Inc. gives You the
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additional right to link the code of Red Hat elfutils with code licensed
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under any Open Source Initiative certified open source license
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(http://www.opensource.org/licenses/index.php) which requires the
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distribution of source code with any binary distribution and to
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distribute linked combinations of the two. Non-GPL Code permitted under
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this exception must only link to the code of Red Hat elfutils through
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those well defined interfaces identified in the file named EXCEPTION
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found in the source code files (the "Approved Interfaces"). The files
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of Non-GPL Code may instantiate templates or use macros or inline
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functions from the Approved Interfaces without causing the resulting
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work to be covered by the GNU General Public License. Only Red Hat,
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Inc. may make changes or additions to the list of Approved Interfaces.
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Red Hat's grant of this exception is conditioned upon your not adding
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any new exceptions. If you wish to add a new Approved Interface or
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exception, please contact Red Hat. You must obey the GNU General Public
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License in all respects for all of the Red Hat elfutils code and other
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code used in conjunction with Red Hat elfutils except the Non-GPL Code
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covered by this exception. If you modify this file, you may extend this
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exception to your version of the file, but you are not obligated to do
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so. If you do not wish to provide this exception without modification,
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you must delete this exception statement from your version and license
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this file solely under the GPL without exception.
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Red Hat elfutils is an included package of the Open Invention Network.
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An included package of the Open Invention Network is a package for which
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Open Invention Network licensees cross-license their patents. No patent
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license is granted, either expressly or impliedly, by designation as an
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included package. Should you wish to participate in the Open Invention
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Network licensing program, please visit www.openinventionnetwork.com
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<http://www.openinventionnetwork.com>. */
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dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column,
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Dwarf_Line ***srcsp, size_t *nsrcs)
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bool is_basename = strchr (fname, '/') == NULL;
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size_t max_match = *nsrcs ?: ~0u;
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size_t act_match = *nsrcs;
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Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp;
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while (INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0)
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Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem);
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/* Get the line number information for this file. */
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if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
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/* Search through all the line number records for a matching
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file and line/column number. If any of the numbers is zero,
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no match is performed. */
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unsigned int lastfile = UINT_MAX;
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bool lastmatch = false;
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for (size_t cnt = 0; cnt < nlines; ++cnt)
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Dwarf_Line *line = &lines->info[cnt];
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if (lastfile != line->file)
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lastfile = line->file;
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if (lastfile >= line->files->nfiles)
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__libdw_seterrno (DWARF_E_INVALID_DWARF);
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/* Match the name with the name the user provided. */
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const char *fname2 = line->files->info[lastfile].name;
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lastmatch = strcmp (basename (fname2), fname) == 0;
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lastmatch = strcmp (fname2, fname) == 0;
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/* See whether line and possibly column match. */
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&& (lineno > line->line
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|| (column != 0 && column > line->column)))
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/* Determine whether this is the best match so far. */
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for (inner = 0; inner < cur_match; ++inner)
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if (match[inner]->files == line->files
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&& match[inner]->file == line->file)
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if (inner < cur_match
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&& (match[inner]->line != line->line
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|| match[inner]->line != lineno
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&& (match[inner]->column != line->column
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|| match[inner]->column != column))))
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/* We know about this file already. If this is a better
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match for the line number, use it. */
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if (match[inner]->line >= line->line
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&& (match[inner]->line != line->line
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|| match[inner]->column >= line->column))
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/* Use the new line. Otherwise the old one. */
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if (cur_match < max_match)
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if (cur_match == act_match)
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/* Enlarge the array for the results. */
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Dwarf_Line **newp = realloc (match,
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* sizeof (Dwarf_Line *));
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__libdw_seterrno (DWARF_E_NOMEM);
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match[cur_match++] = line;
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/* If we managed to find as many matches as the user requested
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already, there is no need to go on to the next CU. */
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if (cur_match == max_match)
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assert (*nsrcs == 0 || *srcsp == match);
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__libdw_seterrno (DWARF_E_NO_MATCH);
added
removed
libdw/dwarf_getsrc_file.c
