Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 1 | /* Find matching source locations in a module. |
| 2 | Copyright (C) 2005 Red Hat, Inc. |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 3 | This file is part of elfutils. |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 4 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 5 | This file is free software; you can redistribute it and/or modify |
| 6 | it under the terms of either |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 7 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 8 | * the GNU Lesser General Public License as published by the Free |
| 9 | Software Foundation; either version 3 of the License, or (at |
| 10 | your option) any later version |
| 11 | |
| 12 | or |
| 13 | |
| 14 | * the GNU General Public License as published by the Free |
| 15 | Software Foundation; either version 2 of the License, or (at |
| 16 | your option) any later version |
| 17 | |
| 18 | or both in parallel, as here. |
| 19 | |
| 20 | elfutils is distributed in the hope that it will be useful, but |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 21 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 23 | General Public License for more details. |
| 24 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 25 | You should have received copies of the GNU General Public License and |
| 26 | the GNU Lesser General Public License along with this program. If |
| 27 | not, see <http://www.gnu.org/licenses/>. */ |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 28 | |
| 29 | #include "libdwflP.h" |
| 30 | #include "../libdw/libdwP.h" |
| 31 | |
| 32 | |
| 33 | int |
| 34 | dwfl_module_getsrc_file (Dwfl_Module *mod, |
| 35 | const char *fname, int lineno, int column, |
| 36 | Dwfl_Line ***srcsp, size_t *nsrcs) |
| 37 | { |
| 38 | if (mod == NULL) |
| 39 | return -1; |
| 40 | |
| 41 | if (mod->dw == NULL) |
| 42 | { |
| 43 | Dwarf_Addr bias; |
| 44 | if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL) |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | bool is_basename = strchr (fname, '/') == NULL; |
| 49 | |
| 50 | size_t max_match = *nsrcs ?: ~0u; |
| 51 | size_t act_match = *nsrcs; |
| 52 | size_t cur_match = 0; |
| 53 | Dwfl_Line **match = *nsrcs == 0 ? NULL : *srcsp; |
| 54 | |
| 55 | struct dwfl_cu *cu = NULL; |
| 56 | Dwfl_Error error; |
| 57 | while ((error = __libdwfl_nextcu (mod, cu, &cu)) == DWFL_E_NOERROR |
| 58 | && cu != NULL |
| 59 | && (error = __libdwfl_cu_getsrclines (cu)) == DWFL_E_NOERROR) |
| 60 | { |
| 61 | inline const char *INTUSE(dwarf_line_file) (const Dwarf_Line *line) |
| 62 | { |
| 63 | return line->files->info[line->file].name; |
| 64 | } |
| 65 | inline Dwarf_Line *dwfl_line (const Dwfl_Line *line) |
| 66 | { |
| 67 | return &dwfl_linecu (line)->die.cu->lines->info[line->idx]; |
| 68 | } |
| 69 | inline const char *dwfl_line_file (const Dwfl_Line *line) |
| 70 | { |
| 71 | return INTUSE(dwarf_line_file) (dwfl_line (line)); |
| 72 | } |
| 73 | |
| 74 | /* Search through all the line number records for a matching |
| 75 | file and line/column number. If any of the numbers is zero, |
| 76 | no match is performed. */ |
| 77 | const char *lastfile = NULL; |
| 78 | bool lastmatch = false; |
| 79 | for (size_t cnt = 0; cnt < cu->die.cu->lines->nlines; ++cnt) |
| 80 | { |
| 81 | Dwarf_Line *line = &cu->die.cu->lines->info[cnt]; |
| 82 | |
| 83 | if (unlikely (line->file >= line->files->nfiles)) |
| 84 | { |
| 85 | __libdwfl_seterrno (DWFL_E (LIBDW, DWARF_E_INVALID_DWARF)); |
| 86 | return -1; |
| 87 | } |
| 88 | else |
| 89 | { |
| 90 | const char *file = INTUSE(dwarf_line_file) (line); |
| 91 | if (file != lastfile) |
| 92 | { |
| 93 | /* Match the name with the name the user provided. */ |
| 94 | lastfile = file; |
| 95 | lastmatch = !strcmp (is_basename ? basename (file) : file, |
| 96 | fname); |
| 97 | } |
| 98 | } |
| 99 | if (!lastmatch) |
| 100 | continue; |
| 101 | |
| 102 | /* See whether line and possibly column match. */ |
| 103 | if (lineno != 0 |
| 104 | && (lineno > line->line |
| 105 | || (column != 0 && column > line->column))) |
| 106 | /* Cannot match. */ |
| 107 | continue; |
| 108 | |
| 109 | /* Determine whether this is the best match so far. */ |
| 110 | size_t inner; |
| 111 | for (inner = 0; inner < cur_match; ++inner) |
| 112 | if (dwfl_line_file (match[inner]) |
| 113 | == INTUSE(dwarf_line_file) (line)) |
| 114 | break; |
| 115 | if (inner < cur_match |
| 116 | && (dwfl_line (match[inner])->line != line->line |
| 117 | || dwfl_line (match[inner])->line != lineno |
| 118 | || (column != 0 |
| 119 | && (dwfl_line (match[inner])->column != line->column |
| 120 | || dwfl_line (match[inner])->column != column)))) |
| 121 | { |
| 122 | /* We know about this file already. If this is a better |
| 123 | match for the line number, use it. */ |
| 124 | if (dwfl_line (match[inner])->line >= line->line |
| 125 | && (dwfl_line (match[inner])->line != line->line |
| 126 | || dwfl_line (match[inner])->column >= line->column)) |
| 127 | /* Use the new line. Otherwise the old one. */ |
| 128 | match[inner] = &cu->lines->idx[cnt]; |
| 129 | continue; |
| 130 | } |
| 131 | |
| 132 | if (cur_match < max_match) |
| 133 | { |
| 134 | if (cur_match == act_match) |
| 135 | { |
| 136 | /* Enlarge the array for the results. */ |
| 137 | act_match += 10; |
| 138 | Dwfl_Line **newp = realloc (match, |
| 139 | act_match |
| 140 | * sizeof (Dwfl_Line *)); |
| 141 | if (newp == NULL) |
| 142 | { |
| 143 | free (match); |
| 144 | __libdwfl_seterrno (DWFL_E_NOMEM); |
| 145 | return -1; |
| 146 | } |
| 147 | match = newp; |
| 148 | } |
| 149 | |
| 150 | match[cur_match++] = &cu->lines->idx[cnt]; |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | if (cur_match > 0) |
| 156 | { |
| 157 | assert (*nsrcs == 0 || *srcsp == match); |
| 158 | |
| 159 | *nsrcs = cur_match; |
| 160 | *srcsp = match; |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | __libdwfl_seterrno (DWFL_E_NO_MATCH); |
| 166 | return -1; |
| 167 | } |