3 Copyright (C) 1994-2020 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
28 #include "dwarf2/attribute.h"
29 #include "dwarf2/stringify.h"
30 #include "complaints.h"
32 /* See attribute.h. */
35 attribute::value_as_address () const
39 if (form
!= DW_FORM_addr
&& form
!= DW_FORM_addrx
40 && form
!= DW_FORM_GNU_addr_index
)
42 /* Aside from a few clearly defined exceptions, attributes that
43 contain an address must always be in DW_FORM_addr form.
44 Unfortunately, some compilers happen to be violating this
45 requirement by encoding addresses using other forms, such
46 as DW_FORM_data4 for example. For those broken compilers,
47 we try to do our best, without any guarantee of success,
48 to interpret the address correctly. It would also be nice
49 to generate a complaint, but that would require us to maintain
50 a list of legitimate cases where a non-address form is allowed,
51 as well as update callers to pass in at least the CU's DWARF
52 version. This is more overhead than what we're willing to
53 expand for a pretty rare case. */
54 addr
= DW_UNSND (this);
57 addr
= DW_ADDR (this);
62 /* See attribute.h. */
65 attribute::value_as_string () const
67 if (form
== DW_FORM_strp
|| form
== DW_FORM_line_strp
68 || form
== DW_FORM_string
69 || form
== DW_FORM_strx
70 || form
== DW_FORM_strx1
71 || form
== DW_FORM_strx2
72 || form
== DW_FORM_strx3
73 || form
== DW_FORM_strx4
74 || form
== DW_FORM_GNU_str_index
75 || form
== DW_FORM_GNU_strp_alt
)
76 return DW_STRING (this);
80 /* See attribute.h. */
83 attribute::form_is_block () const
85 return (form
== DW_FORM_block1
86 || form
== DW_FORM_block2
87 || form
== DW_FORM_block4
88 || form
== DW_FORM_block
89 || form
== DW_FORM_exprloc
);
92 /* See attribute.h. */
95 attribute::form_is_section_offset () const
97 return (form
== DW_FORM_data4
98 || form
== DW_FORM_data8
99 || form
== DW_FORM_sec_offset
100 || form
== DW_FORM_loclistx
);
103 /* See attribute.h. */
106 attribute::form_is_constant () const
116 case DW_FORM_implicit_const
:
123 /* DW_ADDR is always stored already as sect_offset; despite for the forms
124 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
127 attribute::form_is_ref () const
131 case DW_FORM_ref_addr
:
136 case DW_FORM_ref_udata
:
137 case DW_FORM_GNU_ref_alt
:
144 /* See attribute.h. */
147 attribute::get_ref_die_offset () const
150 return (sect_offset
) DW_UNSND (this);
152 complaint (_("unsupported die ref attribute form: '%s'"),
153 dwarf_form_name (form
));
157 /* See attribute.h. */
160 attribute::constant_value (int default_value
) const
162 if (form
== DW_FORM_sdata
|| form
== DW_FORM_implicit_const
)
163 return DW_SND (this);
164 else if (form
== DW_FORM_udata
165 || form
== DW_FORM_data1
166 || form
== DW_FORM_data2
167 || form
== DW_FORM_data4
168 || form
== DW_FORM_data8
)
169 return DW_UNSND (this);
172 /* For DW_FORM_data16 see attribute::form_is_constant. */
173 complaint (_("Attribute value is not a constant (%s)"),
174 dwarf_form_name (form
));
175 return default_value
;