1 /* Find line information for address. 2 Copyright (C) 2004, 2005, 2014 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2004. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include "libdwP.h" 35 #include <assert.h> 36 37 38 Dwarf_Line * 39 dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr) 40 { 41 Dwarf_Lines *lines; 42 size_t nlines; 43 44 if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0) 45 return NULL; 46 47 /* The lines are sorted by address, so we can use binary search. */ 48 if (nlines > 0) 49 { 50 size_t l = 0, u = nlines - 1; 51 while (l < u) 52 { 53 size_t idx = u - (u - l) / 2; 54 Dwarf_Line *line = &lines->info[idx]; 55 if (addr < line->addr) 56 u = idx - 1; 57 else 58 l = idx; 59 } 60 61 /* This is guaranteed for us by libdw read_srclines. */ 62 assert (lines->info[nlines - 1].end_sequence); 63 64 /* The last line which is less than or equal to addr is what we 65 want, unless it is the end_sequence which is after the 66 current line sequence. */ 67 Dwarf_Line *line = &lines->info[l]; 68 if (! line->end_sequence && line->addr <= addr) 69 return &lines->info[l]; 70 } 71 72 __libdw_seterrno (DWARF_E_ADDR_OUTOFRANGE); 73 return NULL; 74 } 75
