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0e3509db | 1 | # Type utilities. |
7b6bb8da | 2 | # Copyright (C) 2010, 2011 Free Software Foundation, Inc. |
0e3509db DE |
3 | |
4 | # This program is free software; you can redistribute it and/or modify | |
5 | # it under the terms of the GNU General Public License as published by | |
6 | # the Free Software Foundation; either version 3 of the License, or | |
7 | # (at your option) any later version. | |
8 | # | |
9 | # This program is distributed in the hope that it will be useful, | |
10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | # GNU General Public License for more details. | |
13 | # | |
14 | # You should have received a copy of the GNU General Public License | |
15 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | ||
17 | """Utilities for working with gdb.Types.""" | |
18 | ||
19 | import gdb | |
20 | ||
21 | ||
22 | def get_basic_type(type_): | |
23 | """Return the "basic" type of a type. | |
24 | ||
25 | Arguments: | |
26 | type_: The type to reduce to its basic type. | |
27 | ||
28 | Returns: | |
29 | type_ with const/volatile is stripped away, | |
30 | and typedefs/references converted to the underlying type. | |
31 | """ | |
32 | ||
33 | while (type_.code == gdb.TYPE_CODE_REF or | |
34 | type_.code == gdb.TYPE_CODE_TYPEDEF): | |
35 | if type_.code == gdb.TYPE_CODE_REF: | |
36 | type_ = type_.target() | |
37 | else: | |
38 | type_ = type_.strip_typedefs() | |
39 | return type_.unqualified() | |
40 | ||
41 | ||
42 | def has_field(type_, field): | |
43 | """Return True if a type has the specified field. | |
44 | ||
45 | Arguments: | |
46 | type_: The type to examine. | |
47 | It must be one of gdb.TYPE_CODE_STRUCT, gdb.TYPE_CODE_UNION. | |
48 | field: The name of the field to look up. | |
49 | ||
50 | Returns: | |
51 | True if the field is present either in type_ or any baseclass. | |
52 | ||
53 | Raises: | |
54 | TypeError: The type is not a struct or union. | |
55 | """ | |
56 | ||
57 | type_ = get_basic_type(type_) | |
58 | if (type_.code != gdb.TYPE_CODE_STRUCT and | |
59 | type_.code != gdb.TYPE_CODE_UNION): | |
60 | raise TypeError("not a struct or union") | |
61 | for f in type_.fields(): | |
62 | if f.is_base_class: | |
63 | if has_field(f.type, field): | |
64 | return True | |
65 | else: | |
66 | # NOTE: f.name could be None | |
67 | if f.name == field: | |
68 | return True | |
69 | return False | |
70 | ||
71 | ||
72 | def make_enum_dict(enum_type): | |
73 | """Return a dictionary from a program's enum type. | |
74 | ||
75 | Arguments: | |
76 | enum_type: The enum to compute the dictionary for. | |
77 | ||
78 | Returns: | |
79 | The dictionary of the enum. | |
80 | ||
81 | Raises: | |
82 | TypeError: The type is not an enum. | |
83 | """ | |
84 | ||
85 | if enum_type.code != gdb.TYPE_CODE_ENUM: | |
86 | raise TypeError("not an enum type") | |
87 | enum_dict = {} | |
88 | for field in enum_type.fields(): | |
89 | # The enum's value is stored in "bitpos". | |
90 | enum_dict[field.name] = field.bitpos | |
91 | return enum_dict |