1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
/* DWARF attributes
Copyright (C) 1994-2023 Free Software Foundation, Inc.
Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
Inc. with support from Florida State University (under contract
with the Ada Joint Program Office), and Silicon Graphics, Inc.
Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
based on Fred Fish's (Cygnus Support) implementation of DWARF 1
support.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "dwarf2/attribute.h"
#include "dwarf2/stringify.h"
#include "complaints.h"
/* See attribute.h. */
CORE_ADDR
attribute::as_address () const
{
CORE_ADDR addr;
gdb_assert (!requires_reprocessing);
if (form != DW_FORM_addr && form != DW_FORM_addrx
&& form != DW_FORM_GNU_addr_index)
{
/* Aside from a few clearly defined exceptions, attributes that
contain an address must always be in DW_FORM_addr form.
Unfortunately, some compilers happen to be violating this
requirement by encoding addresses using other forms, such
as DW_FORM_data4 for example. For those broken compilers,
we try to do our best, without any guarantee of success,
to interpret the address correctly. It would also be nice
to generate a complaint, but that would require us to maintain
a list of legitimate cases where a non-address form is allowed,
as well as update callers to pass in at least the CU's DWARF
version. This is more overhead than what we're willing to
expand for a pretty rare case. */
addr = u.unsnd;
}
else
addr = u.addr;
return addr;
}
/* See attribute.h. */
bool
attribute::form_is_string () const
{
return (form == DW_FORM_strp || form == DW_FORM_line_strp
|| form == DW_FORM_string
|| form == DW_FORM_strx
|| form == DW_FORM_strx1
|| form == DW_FORM_strx2
|| form == DW_FORM_strx3
|| form == DW_FORM_strx4
|| form == DW_FORM_GNU_str_index
|| form == DW_FORM_GNU_strp_alt);
}
/* See attribute.h. */
const char *
attribute::as_string () const
{
gdb_assert (!requires_reprocessing);
if (form_is_string ())
return u.str;
return nullptr;
}
/* See attribute.h. */
bool
attribute::form_is_block () const
{
return (form == DW_FORM_block1
|| form == DW_FORM_block2
|| form == DW_FORM_block4
|| form == DW_FORM_block
|| form == DW_FORM_exprloc
|| form == DW_FORM_data16);
}
/* See attribute.h. */
bool
attribute::form_is_section_offset () const
{
return (form == DW_FORM_data4
|| form == DW_FORM_data8
|| form == DW_FORM_sec_offset
|| form == DW_FORM_loclistx);
}
/* See attribute.h. */
bool
attribute::form_is_constant () const
{
switch (form)
{
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_implicit_const:
return true;
default:
return false;
}
}
/* See attribute.h. */
void
attribute::get_ref_die_offset_complaint () const
{
complaint (_("unsupported die ref attribute form: '%s'"),
dwarf_form_name (form));
}
/* See attribute.h. */
LONGEST
attribute::constant_value (int default_value) const
{
if (form == DW_FORM_sdata || form == DW_FORM_implicit_const)
return u.snd;
else if (form == DW_FORM_udata
|| form == DW_FORM_data1
|| form == DW_FORM_data2
|| form == DW_FORM_data4
|| form == DW_FORM_data8)
return u.unsnd;
else
{
/* For DW_FORM_data16 see attribute::form_is_constant. */
complaint (_("Attribute value is not a constant (%s)"),
dwarf_form_name (form));
return default_value;
}
}
/* See attribute.h. */
bool
attribute::form_is_unsigned () const
{
return (form == DW_FORM_ref_addr
|| form == DW_FORM_GNU_ref_alt
|| form == DW_FORM_data2
|| form == DW_FORM_data4
|| form == DW_FORM_data8
|| form == DW_FORM_sec_offset
|| form == DW_FORM_data1
|| form == DW_FORM_flag
|| form == DW_FORM_flag_present
|| form == DW_FORM_udata
|| form == DW_FORM_rnglistx
|| form == DW_FORM_loclistx
|| form == DW_FORM_ref1
|| form == DW_FORM_ref2
|| form == DW_FORM_ref4
|| form == DW_FORM_ref8
|| form == DW_FORM_ref_udata);
}
/* See attribute.h. */
bool
attribute::form_is_signed () const
{
return form == DW_FORM_sdata || form == DW_FORM_implicit_const;
}
/* See attribute.h. */
bool
attribute::form_requires_reprocessing () const
{
return (form == DW_FORM_strx
|| form == DW_FORM_strx1
|| form == DW_FORM_strx2
|| form == DW_FORM_strx3
|| form == DW_FORM_strx4
|| form == DW_FORM_GNU_str_index
|| form == DW_FORM_addrx
|| form == DW_FORM_GNU_addr_index
|| form == DW_FORM_rnglistx
|| form == DW_FORM_loclistx);
}
/* See attribute.h. */
dwarf_defaulted_attribute
attribute::defaulted () const
{
LONGEST value = constant_value (-1);
switch (value)
{
case DW_DEFAULTED_no:
case DW_DEFAULTED_in_class:
case DW_DEFAULTED_out_of_class:
return (dwarf_defaulted_attribute) value;
}
/* If the form was not constant, we already complained in
constant_value, so there's no need to complain again. */
if (form_is_constant ())
complaint (_("unrecognized DW_AT_defaulted value (%s)"),
plongest (value));
return DW_DEFAULTED_no;
}
/* See attribute.h. */
dwarf_virtuality_attribute
attribute::as_virtuality () const
{
LONGEST value = constant_value (-1);
switch (value)
{
case DW_VIRTUALITY_none:
case DW_VIRTUALITY_virtual:
case DW_VIRTUALITY_pure_virtual:
return (dwarf_virtuality_attribute) value;
}
/* If the form was not constant, we already complained in
constant_value, so there's no need to complain again. */
if (form_is_constant ())
complaint (_("unrecognized DW_AT_virtuality value (%s)"),
plongest (value));
return DW_VIRTUALITY_none;
}
/* See attribute.h. */
bool
attribute::as_boolean () const
{
if (form == DW_FORM_flag_present)
return true;
else if (form == DW_FORM_flag)
return u.unsnd != 0;
return constant_value (0) != 0;
}
|
