Relicense BabelTrace library to MIT (BSD-style)
[babeltrace.git] / types / struct.c
1 /*
2 * struct.c
3 *
4 * BabelTrace - Structure Type Converter
5 *
6 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 */
18
19 #include <babeltrace/compiler.h>
20 #include <babeltrace/types.h>
21
22 void struct_copy(struct stream_pos *dest, const struct format *fdest,
23 struct stream_pos *src, const struct format *fsrc,
24 const struct type_class *type_class)
25 {
26 struct type_class_struct *struct_class =
27 container_of(type_class, struct type_class_struct, p);
28 unsigned int i;
29
30 fsrc->struct_begin(src, struct_class);
31 fdest->struct_begin(dest, struct_class);
32
33 for (i = 0; i < struct_class->fields->len; i++) {
34 struct field *field = &g_array_index(struct_class->fields,
35 struct field, i);
36 struct type_class *field_class = field->type_class;
37
38 field_class->copy(dest, fdest, src, fsrc, &field_class->p);
39
40 }
41 fsrc->struct_end(src, struct_class);
42 fdest->struct_end(dest, struct_class);
43 }
44
45 void struct_type_free(struct type_class_struct *struct_class)
46 {
47 g_hash_table_destroy(struct_class->fields_by_name);
48 g_array_free(struct_class->fields, true);
49 g_free(struct_class);
50 }
51
52 static void _struct_type_free(struct type_class *type_class)
53 {
54 struct type_class_struct *struct_class =
55 container_of(type_class, struct type_class_struct, p);
56 struct_type_free(struct_class);
57 }
58
59 struct type_class_struct *struct_type_new(const char *name)
60 {
61 struct type_class_struct *struct_class;
62 int ret;
63
64 struct_class = g_new(struct type_class_struct, 1);
65 type_class = &float_class->p;
66
67 struct_class->fields_by_name = g_hash_table_new(g_direct_hash,
68 g_direct_equal);
69 struct_class->fields = g_array_sized_new(false, false,
70 sizeof(struct field),
71 DEFAULT_NR_STRUCT_FIELDS)
72 type_class->name = g_quark_from_string(name);
73 type_class->alignment = 1;
74 type_class->copy = struct_copy;
75 type_class->free = _struct_type_free;
76
77 if (type_class->name) {
78 ret = ctf_register_type(type_class);
79 if (ret)
80 goto error_register;
81 }
82 return struct_class;
83
84 error_register:
85 g_free(struct_class);
86 return NULL;
87 }
88
89 void struct_type_add_field(struct type_class_struct *struct_class,
90 const char *field_name,
91 struct type_class *type_class)
92 {
93 struct field *field;
94 unsigned long index;
95
96 g_array_set_size(struct_class->fields, struct_class->fields->len + 1);
97 index = struct_class->fields->len - 1; /* last field (new) */
98 field = &g_array_index(struct_class->fields, struct field, index);
99 field->name = g_quark_from_string(field_name);
100 field->type_class = type_class;
101 /* Keep index in hash rather than pointer, because array can relocate */
102 g_hash_table_insert(struct_class->fields_by_name,
103 (gpointer) (unsigned long) field->name,
104 (gpointer) index);
105 /*
106 * Alignment of structure is the max alignment of types contained
107 * therein.
108 */
109 struct_class->p.alignment = max(struct_class->p.alignment,
110 type_class->alignment);
111 }
112
113 unsigned long
114 struct_type_lookup_field_index(struct type_class_struct *struct_class,
115 GQuark field_name)
116 {
117 unsigned long index;
118
119 index = (unsigned long) g_hash_table_lookup(struct_class->fields_by_name,
120 field_name);
121 return index;
122 }
123
124 /*
125 * field returned only valid as long as the field structure is not appended to.
126 */
127 struct field *
128 struct_type_get_field_from_index(struct type_class_struct *struct_class,
129 unsigned long index)
130 {
131 return &g_array_index(struct_class->fields, struct field, index);
132 }
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