Build fix
[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/format.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);
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 unsigned int i;
48
49 g_hash_table_destroy(struct_class->fields_by_name);
50
51 for (i = 0; i < struct_class->fields->len; i++) {
52 struct field *field = &g_array_index(struct_class->fields,
53 struct field, i);
54 type_unref(field->type_class);
55 }
56 g_array_free(struct_class->fields, true);
57 g_free(struct_class);
58 }
59
60 static void _struct_type_free(struct type_class *type_class)
61 {
62 struct type_class_struct *struct_class =
63 container_of(type_class, struct type_class_struct, p);
64 struct_type_free(struct_class);
65 }
66
67 struct type_class_struct *struct_type_new(const char *name)
68 {
69 struct type_class_struct *struct_class;
70 struct type_class *type_class;
71 int ret;
72
73 struct_class = g_new(struct type_class_struct, 1);
74 type_class = &struct_class->p;
75
76 struct_class->fields_by_name = g_hash_table_new(g_direct_hash,
77 g_direct_equal);
78 struct_class->fields = g_array_sized_new(false, false,
79 sizeof(struct field),
80 DEFAULT_NR_STRUCT_FIELDS);
81 type_class->name = g_quark_from_string(name);
82 type_class->alignment = 1;
83 type_class->copy = struct_copy;
84 type_class->free = _struct_type_free;
85 type_class->ref = 1;
86
87 if (type_class->name) {
88 ret = ctf_register_type(type_class);
89 if (ret)
90 goto error_register;
91 }
92 return struct_class;
93
94 error_register:
95 g_free(struct_class);
96 return NULL;
97 }
98
99 void struct_type_add_field(struct type_class_struct *struct_class,
100 const char *field_name,
101 struct type_class *type_class)
102 {
103 struct field *field;
104 unsigned long index;
105
106 g_array_set_size(struct_class->fields, struct_class->fields->len + 1);
107 index = struct_class->fields->len - 1; /* last field (new) */
108 field = &g_array_index(struct_class->fields, struct field, index);
109 field->name = g_quark_from_string(field_name);
110 type_ref(type_class);
111 field->type_class = type_class;
112 /* Keep index in hash rather than pointer, because array can relocate */
113 g_hash_table_insert(struct_class->fields_by_name,
114 (gpointer) (unsigned long) field->name,
115 (gpointer) index);
116 /*
117 * Alignment of structure is the max alignment of types contained
118 * therein.
119 */
120 struct_class->p.alignment = max(struct_class->p.alignment,
121 type_class->alignment);
122 }
123
124 unsigned long
125 struct_type_lookup_field_index(struct type_class_struct *struct_class,
126 GQuark field_name)
127 {
128 unsigned long index;
129
130 index = (unsigned long) g_hash_table_lookup(struct_class->fields_by_name,
131 (gconstpointer) (unsigned long) field_name);
132 return index;
133 }
134
135 /*
136 * field returned only valid as long as the field structure is not appended to.
137 */
138 struct field *
139 struct_type_get_field_from_index(struct type_class_struct *struct_class,
140 unsigned long index)
141 {
142 return &g_array_index(struct_class->fields, struct field, index);
143 }
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