1 /* Find matching source locations in a module.
2 Copyright (C) 2005 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
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
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
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/>. */
28
29 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
32
33 #include "libdwflP.h"
34 #include "../libdw/libdwP.h"
35
36
37 static inline const char *
dwfl_dwarf_line_file(const Dwarf_Line * line)38 dwfl_dwarf_line_file (const Dwarf_Line *line)
39 {
40 return line->files->info[line->file].name;
41 }
42
43 static inline Dwarf_Line *
dwfl_line(const Dwfl_Line * line)44 dwfl_line (const Dwfl_Line *line)
45 {
46 return &dwfl_linecu (line)->die.cu->lines->info[line->idx];
47 }
48
49 static inline const char *
dwfl_line_file(const Dwfl_Line * line)50 dwfl_line_file (const Dwfl_Line *line)
51 {
52 return dwfl_dwarf_line_file (dwfl_line (line));
53 }
54
55 int
dwfl_module_getsrc_file(Dwfl_Module * mod,const char * fname,int lineno,int column,Dwfl_Line *** srcsp,size_t * nsrcs)56 dwfl_module_getsrc_file (Dwfl_Module *mod,
57 const char *fname, int lineno, int column,
58 Dwfl_Line ***srcsp, size_t *nsrcs)
59 {
60 if (mod == NULL)
61 return -1;
62
63 if (mod->dw == NULL)
64 {
65 Dwarf_Addr bias;
66 if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL)
67 return -1;
68 }
69
70 bool is_basename = strchr (fname, '/') == NULL;
71
72 size_t max_match = *nsrcs ?: ~0u;
73 size_t act_match = *nsrcs;
74 size_t cur_match = 0;
75 Dwfl_Line **match = *nsrcs == 0 ? NULL : *srcsp;
76
77 struct dwfl_cu *cu = NULL;
78 Dwfl_Error error;
79 while ((error = __libdwfl_nextcu (mod, cu, &cu)) == DWFL_E_NOERROR
80 && cu != NULL
81 && (error = __libdwfl_cu_getsrclines (cu)) == DWFL_E_NOERROR)
82 {
83 /* Search through all the line number records for a matching
84 file and line/column number. If any of the numbers is zero,
85 no match is performed. */
86 const char *lastfile = NULL;
87 bool lastmatch = false;
88 for (size_t cnt = 0; cnt < cu->die.cu->lines->nlines; ++cnt)
89 {
90 Dwarf_Line *line = &cu->die.cu->lines->info[cnt];
91
92 if (unlikely (line->file >= line->files->nfiles))
93 {
94 if (*nsrcs == 0)
95 free (match);
96 __libdwfl_seterrno (DWFL_E (LIBDW, DWARF_E_INVALID_DWARF));
97 return -1;
98 }
99 else
100 {
101 const char *file = dwfl_dwarf_line_file (line);
102 if (file != lastfile)
103 {
104 /* Match the name with the name the user provided. */
105 lastfile = file;
106 lastmatch = !strcmp (is_basename ? basename (file) : file,
107 fname);
108 }
109 }
110 if (!lastmatch)
111 continue;
112
113 /* See whether line and possibly column match. */
114 if (lineno != 0
115 && (lineno > line->line
116 || (column != 0 && column > line->column)))
117 /* Cannot match. */
118 continue;
119
120 /* Determine whether this is the best match so far. */
121 size_t inner;
122 for (inner = 0; inner < cur_match; ++inner)
123 if (dwfl_line_file (match[inner])
124 == dwfl_dwarf_line_file (line))
125 break;
126 if (inner < cur_match
127 && (dwfl_line (match[inner])->line != line->line
128 || dwfl_line (match[inner])->line != lineno
129 || (column != 0
130 && (dwfl_line (match[inner])->column != line->column
131 || dwfl_line (match[inner])->column != column))))
132 {
133 /* We know about this file already. If this is a better
134 match for the line number, use it. */
135 if (dwfl_line (match[inner])->line >= line->line
136 && (dwfl_line (match[inner])->line != line->line
137 || dwfl_line (match[inner])->column >= line->column))
138 /* Use the new line. Otherwise the old one. */
139 match[inner] = &cu->lines->idx[cnt];
140 continue;
141 }
142
143 if (cur_match < max_match)
144 {
145 if (cur_match == act_match)
146 {
147 /* Enlarge the array for the results. */
148 act_match += 10;
149 Dwfl_Line **newp = realloc (match,
150 act_match
151 * sizeof (Dwfl_Line *));
152 if (newp == NULL)
153 {
154 free (match);
155 __libdwfl_seterrno (DWFL_E_NOMEM);
156 return -1;
157 }
158 match = newp;
159 }
160
161 match[cur_match++] = &cu->lines->idx[cnt];
162 }
163 }
164 }
165
166 if (cur_match > 0)
167 {
168 assert (*nsrcs == 0 || *srcsp == match);
169
170 *nsrcs = cur_match;
171 *srcsp = match;
172
173 return 0;
174 }
175
176 __libdwfl_seterrno (DWFL_E_NO_MATCH);
177 return -1;
178 }
179