1 /* Return source file information of CU.
2 Copyright (C) 2004, 2005, 2013, 2015, 2018 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 <assert.h>
34 #include <dwarf.h>
35 #include "libdwP.h"
36
37
38 int
dwarf_getsrcfiles(Dwarf_Die * cudie,Dwarf_Files ** files,size_t * nfiles)39 dwarf_getsrcfiles (Dwarf_Die *cudie, Dwarf_Files **files, size_t *nfiles)
40 {
41 if (cudie == NULL)
42 return -1;
43 if (! is_cudie (cudie))
44 {
45 __libdw_seterrno (DWARF_E_NOT_CUDIE);
46 return -1;
47 }
48
49 int res = -1;
50
51 /* Get the information if it is not already known. */
52 struct Dwarf_CU *const cu = cudie->cu;
53 if (cu->files == NULL)
54 {
55 /* For split units there might be a simple file table (without lines).
56 If not, use the one from the skeleton. */
57 if (cu->unit_type == DW_UT_split_compile
58 || cu->unit_type == DW_UT_split_type)
59 {
60 /* We tried, assume we fail... */
61 cu->files = (void *) -1;
62
63 /* See if there is a .debug_line section, for split CUs
64 the table is at offset zero. */
65 if (cu->dbg->sectiondata[IDX_debug_line] != NULL)
66 {
67 Dwarf_Off dwp_off;
68 if (INTUSE(dwarf_cu_dwp_section_info) (cu, DW_SECT_LINE,
69 &dwp_off, NULL) == 0)
70 {
71 /* We are only interested in the files, the lines will
72 always come from the skeleton. */
73 res = __libdw_getsrclines (cu->dbg, dwp_off,
74 __libdw_getcompdir (cudie),
75 cu->address_size, NULL,
76 &cu->files);
77 }
78 }
79 else
80 {
81 Dwarf_CU *skel = __libdw_find_split_unit (cu);
82 if (skel != NULL)
83 {
84 Dwarf_Die skeldie = CUDIE (skel);
85 res = INTUSE(dwarf_getsrcfiles) (&skeldie, files, nfiles);
86 cu->files = skel->files;
87 }
88 }
89 }
90 else
91 {
92 Dwarf_Lines *lines;
93 size_t nlines;
94
95 /* Let the more generic function do the work. It'll create more
96 data but that will be needed in an real program anyway. */
97 res = INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines);
98 }
99 }
100 else if (cu->files != (void *) -1l)
101 /* We already have the information. */
102 res = 0;
103
104 if (likely (res == 0))
105 {
106 assert (cu->files != NULL && cu->files != (void *) -1l);
107 *files = cu->files;
108 if (nfiles != NULL)
109 *nfiles = cu->files->nfiles;
110 }
111
112 // XXX Eventually: unlocking here.
113
114 return res;
115 }
116 INTDEF (dwarf_getsrcfiles)
117