1 /* Find line information for given file/line/column triple.
2 Copyright (C) 2005-2009 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2005.
6 Red Hat elfutils is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 2 of the License.
10 Red Hat elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with Red Hat elfutils; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
19 In addition, as a special exception, Red Hat, Inc. gives You the
20 additional right to link the code of Red Hat elfutils with code licensed
21 under any Open Source Initiative certified open source license
22 (http://www.opensource.org/licenses/index.php) which requires the
23 distribution of source code with any binary distribution and to
24 distribute linked combinations of the two. Non-GPL Code permitted under
25 this exception must only link to the code of Red Hat elfutils through
26 those well defined interfaces identified in the file named EXCEPTION
27 found in the source code files (the "Approved Interfaces"). The files
28 of Non-GPL Code may instantiate templates or use macros or inline
29 functions from the Approved Interfaces without causing the resulting
30 work to be covered by the GNU General Public License. Only Red Hat,
31 Inc. may make changes or additions to the list of Approved Interfaces.
32 Red Hat's grant of this exception is conditioned upon your not adding
33 any new exceptions. If you wish to add a new Approved Interface or
34 exception, please contact Red Hat. You must obey the GNU General Public
35 License in all respects for all of the Red Hat elfutils code and other
36 code used in conjunction with Red Hat elfutils except the Non-GPL Code
37 covered by this exception. If you modify this file, you may extend this
38 exception to your version of the file, but you are not obligated to do
39 so. If you do not wish to provide this exception without modification,
40 you must delete this exception statement from your version and license
41 this file solely under the GPL without exception.
43 Red Hat elfutils is an included package of the Open Invention Network.
44 An included package of the Open Invention Network is a package for which
45 Open Invention Network licensees cross-license their patents. No patent
46 license is granted, either expressly or impliedly, by designation as an
47 included package. Should you wish to participate in the Open Invention
48 Network licensing program, please visit www.openinventionnetwork.com
49 <http://www.openinventionnetwork.com>. */
64 dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column,
65 Dwarf_Line ***srcsp, size_t *nsrcs)
70 bool is_basename = strchr (fname, '/') == NULL;
72 size_t max_match = *nsrcs ?: ~0u;
73 size_t act_match = *nsrcs;
75 Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp;
79 for (Dwarf_Off off = 0;
80 INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0;
84 Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem);
88 /* Get the line number information for this file. */
91 if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
93 /* Ignore a CU that just has no DW_AT_stmt_list at all. */
94 int error = INTUSE(dwarf_errno) ();
97 __libdw_seterrno (error);
101 /* Search through all the line number records for a matching
102 file and line/column number. If any of the numbers is zero,
103 no match is performed. */
104 unsigned int lastfile = UINT_MAX;
105 bool lastmatch = false;
106 for (size_t cnt = 0; cnt < nlines; ++cnt)
108 Dwarf_Line *line = &lines->info[cnt];
110 if (lastfile != line->file)
112 lastfile = line->file;
113 if (lastfile >= line->files->nfiles)
115 __libdw_seterrno (DWARF_E_INVALID_DWARF);
119 /* Match the name with the name the user provided. */
120 const char *fname2 = line->files->info[lastfile].name;
122 lastmatch = strcmp (basename (fname2), fname) == 0;
124 lastmatch = strcmp (fname2, fname) == 0;
129 /* See whether line and possibly column match. */
131 && (lineno > line->line
132 || (column != 0 && column > line->column)))
136 /* Determine whether this is the best match so far. */
138 for (inner = 0; inner < cur_match; ++inner)
139 if (match[inner]->files == line->files
140 && match[inner]->file == line->file)
142 if (inner < cur_match
143 && (match[inner]->line != line->line
144 || match[inner]->line != lineno
146 && (match[inner]->column != line->column
147 || match[inner]->column != column))))
149 /* We know about this file already. If this is a better
150 match for the line number, use it. */
151 if (match[inner]->line >= line->line
152 && (match[inner]->line != line->line
153 || match[inner]->column >= line->column))
154 /* Use the new line. Otherwise the old one. */
159 if (cur_match < max_match)
161 if (cur_match == act_match)
163 /* Enlarge the array for the results. */
165 Dwarf_Line **newp = realloc (match,
167 * sizeof (Dwarf_Line *));
171 __libdw_seterrno (DWARF_E_NOMEM);
177 match[cur_match++] = line;
181 /* If we managed to find as many matches as the user requested
182 already, there is no need to go on to the next CU. */
183 if (cur_match == max_match)
189 assert (*nsrcs == 0 || *srcsp == match);
197 __libdw_seterrno (DWARF_E_NO_MATCH);