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[babeltrace.git] / types / struct.c
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11796b96 1/*
ccd7e1c8 2 * struct.c
11796b96 3 *
ccd7e1c8 4 * BabelTrace - Structure Type Converter
11796b96 5 *
ccd7e1c8 6 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11796b96 7 *
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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:
11796b96 14 *
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15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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17 */
18
19#include <babeltrace/compiler.h>
4c8bfb7e 20#include <babeltrace/format.h>
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21
22void 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
4c8bfb7e 38 field_class->copy(dest, fdest, src, fsrc, field_class);
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39
40 }
41 fsrc->struct_end(src, struct_class);
42 fdest->struct_end(dest, struct_class);
43}
44
45void struct_type_free(struct type_class_struct *struct_class)
46{
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47 unsigned int i;
48
11796b96 49 g_hash_table_destroy(struct_class->fields_by_name);
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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 }
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56 g_array_free(struct_class->fields, true);
57 g_free(struct_class);
58}
59
60static 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
67struct type_class_struct *struct_type_new(const char *name)
68{
69 struct type_class_struct *struct_class;
4c8bfb7e 70 struct type_class *type_class;
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71 int ret;
72
73 struct_class = g_new(struct type_class_struct, 1);
4c8bfb7e 74 type_class = &struct_class->p;
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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),
4c8bfb7e 80 DEFAULT_NR_STRUCT_FIELDS);
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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;
4c8bfb7e 85 type_class->ref = 1;
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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
94error_register:
95 g_free(struct_class);
96 return NULL;
97}
98
99void 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);
4c8bfb7e 110 type_ref(type_class);
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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
124unsigned long
125struct_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,
4c8bfb7e 131 (gconstpointer) (unsigned long) field_name);
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132 return index;
133}
134
135/*
136 * field returned only valid as long as the field structure is not appended to.
137 */
138struct field *
139struct_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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