/* Find line information for given file/line/column triple. Copyright (C) 2005-2009 Red Hat, Inc. This file is part of Red Hat elfutils. Written by Ulrich Drepper , 2005. Red Hat elfutils is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. Red Hat elfutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Red Hat elfutils; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. In addition, as a special exception, Red Hat, Inc. gives You the additional right to link the code of Red Hat elfutils with code licensed under any Open Source Initiative certified open source license (http://www.opensource.org/licenses/index.php) which requires the distribution of source code with any binary distribution and to distribute linked combinations of the two. Non-GPL Code permitted under this exception must only link to the code of Red Hat elfutils through those well defined interfaces identified in the file named EXCEPTION found in the source code files (the "Approved Interfaces"). The files of Non-GPL Code may instantiate templates or use macros or inline functions from the Approved Interfaces without causing the resulting work to be covered by the GNU General Public License. Only Red Hat, Inc. may make changes or additions to the list of Approved Interfaces. Red Hat's grant of this exception is conditioned upon your not adding any new exceptions. If you wish to add a new Approved Interface or exception, please contact Red Hat. You must obey the GNU General Public License in all respects for all of the Red Hat elfutils code and other code used in conjunction with Red Hat elfutils except the Non-GPL Code covered by this exception. If you modify this file, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to provide this exception without modification, you must delete this exception statement from your version and license this file solely under the GPL without exception. Red Hat elfutils is an included package of the Open Invention Network. An included package of the Open Invention Network is a package for which Open Invention Network licensees cross-license their patents. No patent license is granted, either expressly or impliedly, by designation as an included package. Should you wish to participate in the Open Invention Network licensing program, please visit www.openinventionnetwork.com . */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include #include "libdwP.h" int dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column, Dwarf_Line ***srcsp, size_t *nsrcs) { if (dbg == NULL) return -1; bool is_basename = strchr (fname, '/') == NULL; size_t max_match = *nsrcs ?: ~0u; size_t act_match = *nsrcs; size_t cur_match = 0; Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp; size_t cuhl; Dwarf_Off noff; for (Dwarf_Off off = 0; INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0; off = noff) { Dwarf_Die cudie_mem; Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem); if (cudie == NULL) continue; /* Get the line number information for this file. */ Dwarf_Lines *lines; size_t nlines; if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0) { /* Ignore a CU that just has no DW_AT_stmt_list at all. */ int error = INTUSE(dwarf_errno) (); if (error == 0) continue; __libdw_seterrno (error); return -1; } /* Search through all the line number records for a matching file and line/column number. If any of the numbers is zero, no match is performed. */ unsigned int lastfile = UINT_MAX; bool lastmatch = false; for (size_t cnt = 0; cnt < nlines; ++cnt) { Dwarf_Line *line = &lines->info[cnt]; if (lastfile != line->file) { lastfile = line->file; if (lastfile >= line->files->nfiles) { __libdw_seterrno (DWARF_E_INVALID_DWARF); return -1; } /* Match the name with the name the user provided. */ const char *fname2 = line->files->info[lastfile].name; if (is_basename) lastmatch = strcmp (basename (fname2), fname) == 0; else lastmatch = strcmp (fname2, fname) == 0; } if (!lastmatch) continue; /* See whether line and possibly column match. */ if (lineno != 0 && (lineno > line->line || (column != 0 && column > line->column))) /* Cannot match. */ continue; /* Determine whether this is the best match so far. */ size_t inner; for (inner = 0; inner < cur_match; ++inner) if (match[inner]->files == line->files && match[inner]->file == line->file) break; if (inner < cur_match && (match[inner]->line != line->line || match[inner]->line != lineno || (column != 0 && (match[inner]->column != line->column || match[inner]->column != column)))) { /* We know about this file already. If this is a better match for the line number, use it. */ if (match[inner]->line >= line->line && (match[inner]->line != line->line || match[inner]->column >= line->column)) /* Use the new line. Otherwise the old one. */ match[inner] = line; continue; } if (cur_match < max_match) { if (cur_match == act_match) { /* Enlarge the array for the results. */ act_match += 10; Dwarf_Line **newp = realloc (match, act_match * sizeof (Dwarf_Line *)); if (newp == NULL) { free (match); __libdw_seterrno (DWARF_E_NOMEM); return -1; } match = newp; } match[cur_match++] = line; } } /* If we managed to find as many matches as the user requested already, there is no need to go on to the next CU. */ if (cur_match == max_match) break; } if (cur_match > 0) { assert (*nsrcs == 0 || *srcsp == match); *nsrcs = cur_match; *srcsp = match; return 0; } __libdw_seterrno (DWARF_E_NO_MATCH); return -1; }