Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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. |
| 5 | |
| 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. |
| 9 | |
| 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. |
| 14 | |
| 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. |
| 18 | |
| 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. |
| 42 | |
| 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>. */ |
| 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include <assert.h> |
| 56 | #include <limits.h> |
| 57 | #include <stdlib.h> |
| 58 | #include <string.h> |
| 59 | |
| 60 | #include "libdwP.h" |
| 61 | |
| 62 | |
| 63 | int |
| 64 | dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column, |
| 65 | Dwarf_Line ***srcsp, size_t *nsrcs) |
| 66 | { |
| 67 | if (dbg == NULL) |
| 68 | return -1; |
| 69 | |
| 70 | bool is_basename = strchr (fname, '/') == NULL; |
| 71 | |
| 72 | size_t max_match = *nsrcs ?: ~0u; |
| 73 | size_t act_match = *nsrcs; |
| 74 | size_t cur_match = 0; |
| 75 | Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp; |
| 76 | |
| 77 | size_t cuhl; |
| 78 | Dwarf_Off noff; |
| 79 | for (Dwarf_Off off = 0; |
| 80 | INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0; |
| 81 | off = noff) |
| 82 | { |
| 83 | Dwarf_Die cudie_mem; |
| 84 | Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem); |
| 85 | if (cudie == NULL) |
| 86 | continue; |
| 87 | |
| 88 | /* Get the line number information for this file. */ |
| 89 | Dwarf_Lines *lines; |
| 90 | size_t nlines; |
| 91 | if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0) |
| 92 | { |
| 93 | /* Ignore a CU that just has no DW_AT_stmt_list at all. */ |
| 94 | int error = INTUSE(dwarf_errno) (); |
| 95 | if (error == 0) |
| 96 | continue; |
| 97 | __libdw_seterrno (error); |
| 98 | return -1; |
| 99 | } |
| 100 | |
| 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) |
| 107 | { |
| 108 | Dwarf_Line *line = &lines->info[cnt]; |
| 109 | |
| 110 | if (lastfile != line->file) |
| 111 | { |
| 112 | lastfile = line->file; |
| 113 | if (lastfile >= line->files->nfiles) |
| 114 | { |
| 115 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 116 | return -1; |
| 117 | } |
| 118 | |
| 119 | /* Match the name with the name the user provided. */ |
| 120 | const char *fname2 = line->files->info[lastfile].name; |
| 121 | if (is_basename) |
| 122 | lastmatch = strcmp (basename (fname2), fname) == 0; |
| 123 | else |
| 124 | lastmatch = strcmp (fname2, fname) == 0; |
| 125 | } |
| 126 | if (!lastmatch) |
| 127 | continue; |
| 128 | |
| 129 | /* See whether line and possibly column match. */ |
| 130 | if (lineno != 0 |
| 131 | && (lineno > line->line |
| 132 | || (column != 0 && column > line->column))) |
| 133 | /* Cannot match. */ |
| 134 | continue; |
| 135 | |
| 136 | /* Determine whether this is the best match so far. */ |
| 137 | size_t inner; |
| 138 | for (inner = 0; inner < cur_match; ++inner) |
| 139 | if (match[inner]->files == line->files |
| 140 | && match[inner]->file == line->file) |
| 141 | break; |
| 142 | if (inner < cur_match |
| 143 | && (match[inner]->line != line->line |
| 144 | || match[inner]->line != lineno |
| 145 | || (column != 0 |
| 146 | && (match[inner]->column != line->column |
| 147 | || match[inner]->column != column)))) |
| 148 | { |
| 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. */ |
| 155 | match[inner] = line; |
| 156 | continue; |
| 157 | } |
| 158 | |
| 159 | if (cur_match < max_match) |
| 160 | { |
| 161 | if (cur_match == act_match) |
| 162 | { |
| 163 | /* Enlarge the array for the results. */ |
| 164 | act_match += 10; |
| 165 | Dwarf_Line **newp = realloc (match, |
| 166 | act_match |
| 167 | * sizeof (Dwarf_Line *)); |
| 168 | if (newp == NULL) |
| 169 | { |
| 170 | free (match); |
| 171 | __libdw_seterrno (DWARF_E_NOMEM); |
| 172 | return -1; |
| 173 | } |
| 174 | match = newp; |
| 175 | } |
| 176 | |
| 177 | match[cur_match++] = line; |
| 178 | } |
| 179 | } |
| 180 | |
| 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) |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | if (cur_match > 0) |
| 188 | { |
| 189 | assert (*nsrcs == 0 || *srcsp == match); |
| 190 | |
| 191 | *nsrcs = cur_match; |
| 192 | *srcsp = match; |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | __libdw_seterrno (DWARF_E_NO_MATCH); |
| 198 | return -1; |
| 199 | } |