Branch data Line data Source code
1 : : /* Find line information for a given macro.
2 : : Copyright (C) 2014 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 "libdwP.h"
34 : :
35 : : int
36 : 13 : dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
37 : : Dwarf_Files **files, size_t *nfiles)
38 : : {
39 : : /* macro is declared NN */
40 : 13 : Dwarf_Macro_Op_Table *const table = macro->table;
41 [ + + ]: 13 : if (table->files == NULL)
42 : : {
43 : 4 : Dwarf_Off line_offset = table->line_offset;
44 [ - + ]: 4 : if (line_offset == (Dwarf_Off) -1)
45 : : {
46 : 0 : *files = NULL;
47 : 0 : *nfiles = 0;
48 : 0 : return 0;
49 : : }
50 : :
51 : : /* If TABLE->comp_dir is NULL that could mean any of the
52 : : following:
53 : :
54 : : - The macro unit is not bound to a CU. It's an auxiliary
55 : : unit used purely for import from other units. In that case
56 : : there's actually no COMP_DIR value that we could use.
57 : :
58 : : - The macro unit is bound to a CU, but there's no
59 : : DW_AT_comp_dir attribute at the CU DIE.
60 : :
61 : : - The macro unit is bound to a CU, but we don't know that,
62 : : likely because its iteration was requested through
63 : : dwarf_getmacros_off interface. This might be legitimate if
64 : : one macro unit imports another CU's macro unit, but that is
65 : : unlikely to happen in practice. Most probably this is not
66 : : legitimate use of the interfaces.
67 : :
68 : : So when the interfaces are used correctly, COMP_DIR value is
69 : : always right. That means that we can cache the parsed
70 : : .debug_line unit without fear that later on someone requests
71 : : the same unit through dwarf_getsrcfiles, and the file names
72 : : will be broken. */
73 : :
74 [ - + ]: 4 : if (__libdw_getsrclines (dbg, line_offset, table->comp_dir,
75 [ + + ]: 4 : table->is_64bit ? 8 : 4,
76 : : NULL, &table->files) < 0)
77 : 0 : table->files = (void *) -1;
78 : : }
79 : :
80 [ + - ]: 13 : if (table->files == (void *) -1)
81 : : return -1;
82 : :
83 : 13 : *files = table->files;
84 : 13 : *nfiles = table->files->nfiles;
85 : 13 : return 0;
86 : : }
|