1 /* Find line information for address. 2 Copyright (C) 2004, 2005 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 size_t l = 0, u = nlines; 49 while (l < u) 50 { 51 size_t idx = (l + u) / 2; 52 if (addr < lines->info[idx].addr) 53 u = idx; 54 else if (addr > lines->info[idx].addr || lines->info[idx].end_sequence) 55 l = idx + 1; 56 else 57 return &lines->info[idx]; 58 } 59 60 if (nlines > 0) 61 assert (lines->info[nlines - 1].end_sequence); 62 63 /* If none were equal, the closest one below is what we want. We 64 never want the last one, because it's the end-sequence marker 65 with an address at the high bound of the CU's code. If the debug 66 information is faulty and no end-sequence marker is present, we 67 still ignore it. */ 68 if (u > 0 && u < nlines && addr > lines->info[u - 1].addr) 69 { 70 while (lines->info[u - 1].end_sequence && u > 0) 71 --u; 72 if (u > 0) 73 return &lines->info[u - 1]; 74 } 75 76 __libdw_seterrno (DWARF_E_ADDR_OUTOFRANGE); 77 return NULL; 78 } 79
