1 /* Test program for dwfl_module_return_value_location.
2 Copyright (C) 2005 Red Hat, Inc.
3 Copyright (C) 2023 Mark J. Wielaard <[email protected]>
4 This file is part of elfutils.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 elfutils is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19 #include <config.h>
20 #include <assert.h>
21 #include <inttypes.h>
22 #include ELFUTILS_HEADER(dwfl)
23 #include <dwarf.h>
24 #include <argp.h>
25 #include <stdio.h>
26 #include <stdio_ext.h>
27 #include <locale.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <fnmatch.h>
31 #include "system.h"
32
33
34 struct args
35 {
36 Dwfl *dwfl;
37 Dwarf_Die *cu;
38 Dwarf_Addr dwbias;
39 char **argv;
40 };
41
42 static int
handle_function(Dwarf_Die * funcdie,void * arg)43 handle_function (Dwarf_Die *funcdie, void *arg)
44 {
45 struct args *a = arg;
46
47 const char *name = dwarf_diename (funcdie);
48 char **argv = a->argv;
49 if (argv[0] != NULL)
50 {
51 bool match;
52 do
53 match = fnmatch (*argv, name, 0) == 0;
54 while (!match && *++argv);
55 if (!match)
56 return 0;
57 }
58
59 printf ("(%s) %s: ", dwfl_module_info (dwfl_cumodule (a->cu), NULL,
60 NULL, NULL,
61 NULL, NULL,
62 NULL, NULL), name);
63
64 const Dwarf_Op *locops;
65 int nlocops = dwfl_module_return_value_location (dwfl_cumodule (a->cu),
66 funcdie, &locops);
67 if (nlocops < 0)
68 error (EXIT_FAILURE, 0, "dwfl_module_return_value_location: %s",
69 dwfl_errmsg (-1));
70 else if (nlocops == 0)
71 {
72 // Check if this is the special unspecified type
73 // https://sourceware.org/bugzilla/show_bug.cgi?id=30047
74 Dwarf_Die die_mem, *typedie = &die_mem;
75 Dwarf_Attribute attr_mem, *attr;
76 attr = dwarf_attr_integrate (funcdie, DW_AT_type, &attr_mem);
77 if (dwarf_formref_die (attr, typedie) != NULL
78 && dwarf_tag (typedie) == DW_TAG_unspecified_type)
79 puts ("returns unspecified type");
80 else
81 puts ("returns no value");
82 }
83 else
84 {
85 printf ("return value location:");
86 for (int i = 0; i < nlocops; ++i)
87 printf (" {%#x, %#" PRIx64 "}", locops[i].atom, locops[i].number);
88 puts ("");
89 }
90
91 return 0;
92 }
93
94
95 int
main(int argc,char * argv[])96 main (int argc, char *argv[])
97 {
98 int remaining;
99
100 /* Set locale. */
101 (void) setlocale (LC_ALL, "");
102
103 struct args a = { .dwfl = NULL, .cu = NULL };
104
105 (void) argp_parse (dwfl_standard_argp (), argc, argv, 0, &remaining,
106 &a.dwfl);
107 assert (a.dwfl != NULL);
108 a.argv = &argv[remaining];
109
110 int result = 0;
111
112 while ((a.cu = dwfl_nextcu (a.dwfl, a.cu, &a.dwbias)) != NULL)
113 dwarf_getfuncs (a.cu, &handle_function, &a, 0);
114
115 dwfl_end (a.dwfl);
116
117 return result;
118 }
119