1 /* Test program for dwarf_peel_type. Peels type of top-level vars.
2 Copyright (C) 2017 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 the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21
22 #include <assert.h>
23 #include <argp.h>
24 #include <inttypes.h>
25 #include <fcntl.h>
26 #include ELFUTILS_HEADER(dw)
27 #include ELFUTILS_HEADER(dwfl)
28 #include <stdio.h>
29 #include <unistd.h>
30 #include <dwarf.h>
31
32 #include "../libdw/known-dwarf.h"
33
34 static const char *
dwarf_tag_string(unsigned int tag)35 dwarf_tag_string (unsigned int tag)
36 {
37 switch (tag)
38 {
39 #define DWARF_ONE_KNOWN_DW_TAG(NAME, CODE) case CODE: return #NAME;
40 DWARF_ALL_KNOWN_DW_TAG
41 #undef DWARF_ONE_KNOWN_DW_TAG
42 default:
43 return NULL;
44 }
45 }
46
47 void
print_var_raw_type(Dwarf_Die * var)48 print_var_raw_type (Dwarf_Die *var)
49 {
50 Dwarf_Attribute attr_mem;
51 Dwarf_Die type_mem;
52 Dwarf_Die *type;
53 const char *name = dwarf_diename (var);
54
55 type = dwarf_formref_die (dwarf_attr (var, DW_AT_type, &attr_mem),
56 &type_mem);
57 if (type != NULL)
58 {
59 /* Test twice, once with a separate result DIE. Then with the
60 DIE itself. The resulting tag should be the same. */
61 Dwarf_Die result_mem;
62 Dwarf_Die *result = &result_mem;
63 int res = dwarf_peel_type (type, result);
64 if (res < 0)
65 printf ("%s error peeling type: %s\n", name, dwarf_errmsg (-1));
66 else if (res > 0)
67 printf ("%s missing DW_TAG_TYPE, could peel further: %s\n",
68 name, dwarf_tag_string (dwarf_tag (result)));
69 else
70 {
71 int tag = dwarf_tag (result);
72 printf ("%s raw type %s\n", name, dwarf_tag_string (tag));
73 res = dwarf_peel_type (type, type);
74 if (res < 0)
75 printf ("%s cannot peel type itself: %s\n", name,
76 dwarf_errmsg (-1));
77 else if (res > 0)
78 printf ("%s missing DW_TAG_TYPE, could peel type further: %s\n",
79 name, dwarf_tag_string (dwarf_tag (type)));
80 else if (dwarf_tag (type) != tag)
81 printf ("%s doesn't resolve the same: %s != %s\n", name,
82 dwarf_tag_string (tag),
83 dwarf_tag_string (dwarf_tag (type)));
84 }
85 }
86 else
87 printf ("%s has no type.\n", name);
88 }
89
90 int
main(int argc,char * argv[])91 main (int argc, char *argv[])
92 {
93
94 int remaining;
95 Dwfl *dwfl;
96 (void) argp_parse (dwfl_standard_argp (), argc, argv, 0, &remaining,
97 &dwfl);
98 assert (dwfl != NULL);
99
100 Dwarf_Die *cu = NULL;
101 Dwarf_Addr dwbias;
102 while ((cu = dwfl_nextcu (dwfl, cu, &dwbias)) != NULL)
103 {
104 Dwarf_Die die_mem;
105 Dwarf_Die *die = &die_mem;
106 dwarf_child (cu, &die_mem);
107
108 while (1)
109 {
110 if (dwarf_tag (die) == DW_TAG_variable)
111 print_var_raw_type (die);
112
113 if (dwarf_siblingof (die, &die_mem) != 0)
114 break;
115 }
116 }
117
118 dwfl_end (dwfl);
119 }
120