1 /* Find matching source locations in a module. 2 Copyright (C) 2005 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 In addition, as a special exception, Red Hat, Inc. gives You the 19 additional right to link the code of Red Hat elfutils with code licensed 20 under any Open Source Initiative certified open source license 21 (http://www.opensource.org/licenses/index.php) which requires the 22 distribution of source code with any binary distribution and to 23 distribute linked combinations of the two. Non-GPL Code permitted under 24 this exception must only link to the code of Red Hat elfutils through 25 those well defined interfaces identified in the file named EXCEPTION 26 found in the source code files (the "Approved Interfaces"). The files 27 of Non-GPL Code may instantiate templates or use macros or inline 28 functions from the Approved Interfaces without causing the resulting 29 work to be covered by the GNU General Public License. Only Red Hat, 30 Inc. may make changes or additions to the list of Approved Interfaces. 31 Red Hat's grant of this exception is conditioned upon your not adding 32 any new exceptions. If you wish to add a new Approved Interface or 33 exception, please contact Red Hat. You must obey the GNU General Public 34 License in all respects for all of the Red Hat elfutils code and other 35 code used in conjunction with Red Hat elfutils except the Non-GPL Code 36 covered by this exception. If you modify this file, you may extend this 37 exception to your version of the file, but you are not obligated to do 38 so. If you do not wish to provide this exception without modification, 39 you must delete this exception statement from your version and license 40 this file solely under the GPL without exception. 41 42 Red Hat elfutils is an included package of the Open Invention Network. 43 An included package of the Open Invention Network is a package for which 44 Open Invention Network licensees cross-license their patents. No patent 45 license is granted, either expressly or impliedly, by designation as an 46 included package. Should you wish to participate in the Open Invention 47 Network licensing program, please visit www.openinventionnetwork.com 48 <http://www.openinventionnetwork.com>. */ 49 50 #include "libdwflP.h" 51 #include "../libdw/libdwP.h" 52 53 54 int 55 dwfl_module_getsrc_file (Dwfl_Module *mod, 56 const char *fname, int lineno, int column, 57 Dwfl_Line ***srcsp, size_t *nsrcs) 58 { 59 if (mod == NULL) 60 return -1; 61 62 if (mod->dw == NULL) 63 { 64 Dwarf_Addr bias; 65 if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL) 66 return -1; 67 } 68 69 bool is_basename = strchr (fname, '/') == NULL; 70 71 size_t max_match = *nsrcs ?: ~0u; 72 size_t act_match = *nsrcs; 73 size_t cur_match = 0; 74 Dwfl_Line **match = *nsrcs == 0 ? NULL : *srcsp; 75 76 struct dwfl_cu *cu = NULL; 77 Dwfl_Error error; 78 while ((error = __libdwfl_nextcu (mod, cu, &cu)) == DWFL_E_NOERROR 79 && cu != NULL 80 && (error = __libdwfl_cu_getsrclines (cu)) == DWFL_E_NOERROR) 81 { 82 inline const char *INTUSE(dwarf_line_file) (const Dwarf_Line *line) 83 { 84 return line->files->info[line->file].name; 85 } 86 inline Dwarf_Line *dwfl_line (const Dwfl_Line *line) 87 { 88 return &dwfl_linecu (line)->die.cu->lines->info[line->idx]; 89 } 90 inline const char *dwfl_line_file (const Dwfl_Line *line) 91 { 92 return INTUSE(dwarf_line_file) (dwfl_line (line)); 93 } 94 95 /* Search through all the line number records for a matching 96 file and line/column number. If any of the numbers is zero, 97 no match is performed. */ 98 const char *lastfile = NULL; 99 bool lastmatch = false; 100 for (size_t cnt = 0; cnt < cu->die.cu->lines->nlines; ++cnt) 101 { 102 Dwarf_Line *line = &cu->die.cu->lines->info[cnt]; 103 104 if (unlikely (line->file >= line->files->nfiles)) 105 { 106 __libdwfl_seterrno (DWFL_E (LIBDW, DWARF_E_INVALID_DWARF)); 107 return -1; 108 } 109 else 110 { 111 const char *file = INTUSE(dwarf_line_file) (line); 112 if (file != lastfile) 113 { 114 /* Match the name with the name the user provided. */ 115 lastfile = file; 116 lastmatch = !strcmp (is_basename ? basename (file) : file, 117 fname); 118 } 119 } 120 if (!lastmatch) 121 continue; 122 123 /* See whether line and possibly column match. */ 124 if (lineno != 0 125 && (lineno > line->line 126 || (column != 0 && column > line->column))) 127 /* Cannot match. */ 128 continue; 129 130 /* Determine whether this is the best match so far. */ 131 size_t inner; 132 for (inner = 0; inner < cur_match; ++inner) 133 if (dwfl_line_file (match[inner]) 134 == INTUSE(dwarf_line_file) (line)) 135 break; 136 if (inner < cur_match 137 && (dwfl_line (match[inner])->line != line->line 138 || dwfl_line (match[inner])->line != lineno 139 || (column != 0 140 && (dwfl_line (match[inner])->column != line->column 141 || dwfl_line (match[inner])->column != column)))) 142 { 143 /* We know about this file already. If this is a better 144 match for the line number, use it. */ 145 if (dwfl_line (match[inner])->line >= line->line 146 && (dwfl_line (match[inner])->line != line->line 147 || dwfl_line (match[inner])->column >= line->column)) 148 /* Use the new line. Otherwise the old one. */ 149 match[inner] = &cu->lines->idx[cnt]; 150 continue; 151 } 152 153 if (cur_match < max_match) 154 { 155 if (cur_match == act_match) 156 { 157 /* Enlarge the array for the results. */ 158 act_match += 10; 159 Dwfl_Line **newp = realloc (match, 160 act_match 161 * sizeof (Dwfl_Line *)); 162 if (newp == NULL) 163 { 164 free (match); 165 __libdwfl_seterrno (DWFL_E_NOMEM); 166 return -1; 167 } 168 match = newp; 169 } 170 171 match[cur_match++] = &cu->lines->idx[cnt]; 172 } 173 } 174 } 175 176 if (cur_match > 0) 177 { 178 assert (*nsrcs == 0 || *srcsp == match); 179 180 *nsrcs = cur_match; 181 *srcsp = match; 182 183 return 0; 184 } 185 186 __libdwfl_seterrno (DWFL_E_NO_MATCH); 187 return -1; 188 } 189
