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162dce55 TT |
1 | /* DWARF attributes |
2 | ||
3 | Copyright (C) 1994-2020 Free Software Foundation, Inc. | |
4 | ||
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 | |
10 | support. | |
11 | ||
12 | This file is part of GDB. | |
13 | ||
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. | |
18 | ||
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. | |
23 | ||
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/>. */ | |
26 | ||
27 | #include "defs.h" | |
28 | #include "dwarf2/attribute.h" | |
0826b30a TT |
29 | #include "dwarf2/stringify.h" |
30 | #include "complaints.h" | |
162dce55 TT |
31 | |
32 | /* See attribute.h. */ | |
33 | ||
34 | CORE_ADDR | |
cd6c91b4 | 35 | attribute::value_as_address () const |
162dce55 TT |
36 | { |
37 | CORE_ADDR addr; | |
38 | ||
cd6c91b4 TT |
39 | if (form != DW_FORM_addr && form != DW_FORM_addrx |
40 | && form != DW_FORM_GNU_addr_index) | |
162dce55 TT |
41 | { |
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. */ | |
cd6c91b4 | 54 | addr = DW_UNSND (this); |
162dce55 TT |
55 | } |
56 | else | |
cd6c91b4 | 57 | addr = DW_ADDR (this); |
162dce55 TT |
58 | |
59 | return addr; | |
60 | } | |
61 | ||
62 | /* See attribute.h. */ | |
63 | ||
e61108c9 TT |
64 | const char * |
65 | attribute::value_as_string () const | |
66 | { | |
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); | |
77 | return nullptr; | |
78 | } | |
79 | ||
80 | /* See attribute.h. */ | |
81 | ||
4fc6c0d5 TT |
82 | bool |
83 | attribute::form_is_block () const | |
162dce55 | 84 | { |
4fc6c0d5 TT |
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); | |
162dce55 TT |
90 | } |
91 | ||
92 | /* See attribute.h. */ | |
93 | ||
cd6c91b4 TT |
94 | bool |
95 | attribute::form_is_section_offset () const | |
162dce55 | 96 | { |
cd6c91b4 TT |
97 | return (form == DW_FORM_data4 |
98 | || form == DW_FORM_data8 | |
41144253 | 99 | || form == DW_FORM_sec_offset |
100 | || form == DW_FORM_loclistx); | |
162dce55 TT |
101 | } |
102 | ||
103 | /* See attribute.h. */ | |
104 | ||
cd6c91b4 TT |
105 | bool |
106 | attribute::form_is_constant () const | |
162dce55 | 107 | { |
cd6c91b4 | 108 | switch (form) |
162dce55 TT |
109 | { |
110 | case DW_FORM_sdata: | |
111 | case DW_FORM_udata: | |
112 | case DW_FORM_data1: | |
113 | case DW_FORM_data2: | |
114 | case DW_FORM_data4: | |
115 | case DW_FORM_data8: | |
116 | case DW_FORM_implicit_const: | |
cd6c91b4 | 117 | return true; |
162dce55 | 118 | default: |
cd6c91b4 | 119 | return false; |
162dce55 TT |
120 | } |
121 | } | |
122 | ||
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. */ | |
125 | ||
cd6c91b4 TT |
126 | bool |
127 | attribute::form_is_ref () const | |
162dce55 | 128 | { |
cd6c91b4 | 129 | switch (form) |
162dce55 TT |
130 | { |
131 | case DW_FORM_ref_addr: | |
132 | case DW_FORM_ref1: | |
133 | case DW_FORM_ref2: | |
134 | case DW_FORM_ref4: | |
135 | case DW_FORM_ref8: | |
136 | case DW_FORM_ref_udata: | |
137 | case DW_FORM_GNU_ref_alt: | |
cd6c91b4 | 138 | return true; |
162dce55 | 139 | default: |
cd6c91b4 | 140 | return false; |
162dce55 TT |
141 | } |
142 | } | |
0826b30a TT |
143 | |
144 | /* See attribute.h. */ | |
145 | ||
146 | sect_offset | |
147 | attribute::get_ref_die_offset () const | |
148 | { | |
149 | if (form_is_ref ()) | |
150 | return (sect_offset) DW_UNSND (this); | |
151 | ||
152 | complaint (_("unsupported die ref attribute form: '%s'"), | |
153 | dwarf_form_name (form)); | |
154 | return {}; | |
155 | } | |
156 | ||
157 | /* See attribute.h. */ | |
158 | ||
159 | LONGEST | |
160 | attribute::constant_value (int default_value) const | |
161 | { | |
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); | |
170 | else | |
171 | { | |
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; | |
176 | } | |
177 | } |