| /* Find line information for address. |
| Copyright (C) 2004, 2005 Red Hat, Inc. |
| This file is part of elfutils. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2004. |
| |
| This file is free software; you can redistribute it and/or modify |
| it under the terms of either |
| |
| * the GNU Lesser General Public License as published by the Free |
| Software Foundation; either version 3 of the License, or (at |
| your option) any later version |
| |
| or |
| |
| * the GNU General Public License as published by the Free |
| Software Foundation; either version 2 of the License, or (at |
| your option) any later version |
| |
| or both in parallel, as here. |
| |
| 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 copies of the GNU General Public License and |
| the GNU Lesser General Public License along with this program. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include "libdwP.h" |
| #include <assert.h> |
| |
| |
| Dwarf_Line * |
| dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr) |
| { |
| Dwarf_Lines *lines; |
| size_t nlines; |
| |
| if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0) |
| return NULL; |
| |
| /* The lines are sorted by address, so we can use binary search. */ |
| size_t l = 0, u = nlines; |
| while (l < u) |
| { |
| size_t idx = (l + u) / 2; |
| if (addr < lines->info[idx].addr) |
| u = idx; |
| else if (addr > lines->info[idx].addr || lines->info[idx].end_sequence) |
| l = idx + 1; |
| else |
| return &lines->info[idx]; |
| } |
| |
| if (nlines > 0) |
| assert (lines->info[nlines - 1].end_sequence); |
| |
| /* If none were equal, the closest one below is what we want. We |
| never want the last one, because it's the end-sequence marker |
| with an address at the high bound of the CU's code. If the debug |
| information is faulty and no end-sequence marker is present, we |
| still ignore it. */ |
| if (u > 0 && u < nlines && addr > lines->info[u - 1].addr) |
| { |
| while (lines->info[u - 1].end_sequence && u > 0) |
| --u; |
| if (u > 0) |
| return &lines->info[u - 1]; |
| } |
| |
| __libdw_seterrno (DWARF_E_ADDR_OUTOFRANGE); |
| return NULL; |
| } |