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
38int
39dwarf_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	      /* We are only interested in the files, the lines will
68		 always come from the skeleton.  */
69	      res = __libdw_getsrclines (cu->dbg, 0,
70					 __libdw_getcompdir (cudie),
71					 cu->address_size, NULL,
72					 &cu->files);
73	    }
74	  else
75	    {
76	      Dwarf_CU *skel = __libdw_find_split_unit (cu);
77	      if (skel != NULL)
78		{
79		  Dwarf_Die skeldie = CUDIE (skel);
80		  res = INTUSE(dwarf_getsrcfiles) (&skeldie, files, nfiles);
81		  cu->files = skel->files;
82		}
83	    }
84	}
85      else
86	{
87	  Dwarf_Lines *lines;
88	  size_t nlines;
89
90	  /* Let the more generic function do the work.  It'll create more
91	     data but that will be needed in an real program anyway.  */
92	  res = INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines);
93	}
94    }
95  else if (cu->files != (void *) -1l)
96    /* We already have the information.  */
97    res = 0;
98
99  if (likely (res == 0))
100    {
101      assert (cu->files != NULL && cu->files != (void *) -1l);
102      *files = cu->files;
103      if (nfiles != NULL)
104	*nfiles = cu->files->nfiles;
105    }
106
107  // XXX Eventually: unlocking here.
108
109  return res;
110}
111INTDEF (dwarf_getsrcfiles)
112