062874784f05165439f9109a387f201a0bf8860a
[babeltrace.git] / types / struct.c
1 /*
2 * struct.c
3 *
4 * BabelTrace - Structure Type Converter
5 *
6 * Copyright 2010, 2011 - 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 #ifndef max
23 #define max(a, b) ((a) < (b) ? (b) : (a))
24 #endif
25
26 static
27 struct definition *_struct_definition_new(struct type *type,
28 struct definition_scope *parent_scope);
29 static
30 void _struct_definition_free(struct definition *definition);
31
32 void struct_copy(struct stream_pos *dest, const struct format *fdest,
33 struct stream_pos *src, const struct format *fsrc,
34 struct definition *definition)
35 {
36 struct definition_struct *_struct =
37 container_of(definition, struct definition_struct, p);
38 struct type_struct *struct_type = _struct->type;
39 unsigned long i;
40
41 fsrc->struct_begin(src, struct_type);
42 fdest->struct_begin(dest, struct_type);
43
44 for (i = 0; i < _struct->fields->len; i++) {
45 struct field *field = &g_array_index(_struct->fields,
46 struct field, i);
47 struct type *field_type = field->definition->type;
48
49 field_type->copy(dest, fdest, src, fsrc, field->definition);
50
51 }
52 fsrc->struct_end(src, struct_type);
53 fdest->struct_end(dest, struct_type);
54 }
55
56 static
57 void _struct_type_free(struct type *type)
58 {
59 struct type_struct *struct_type =
60 container_of(type, struct type_struct, p);
61 unsigned long i;
62
63 free_type_scope(struct_type->scope);
64 g_hash_table_destroy(struct_type->fields_by_name);
65
66 for (i = 0; i < struct_type->fields->len; i++) {
67 struct type_field *type_field =
68 &g_array_index(struct_type->fields,
69 struct type_field, i);
70 type_unref(type_field->type);
71 }
72 g_array_free(struct_type->fields, true);
73 g_free(struct_type);
74 }
75
76 struct type_struct *struct_type_new(const char *name,
77 struct type_scope *parent_scope)
78 {
79 struct type_struct *struct_type;
80 struct type *type;
81
82 struct_type = g_new(struct type_struct, 1);
83 type = &struct_type->p;
84 struct_type->fields_by_name = g_hash_table_new(g_direct_hash,
85 g_direct_equal);
86 struct_type->fields = g_array_sized_new(FALSE, TRUE,
87 sizeof(struct type_field),
88 DEFAULT_NR_STRUCT_FIELDS);
89 struct_type->scope = new_type_scope(parent_scope);
90 type->id = CTF_TYPE_STRUCT;
91 type->name = g_quark_from_string(name);
92 type->alignment = 1;
93 type->copy = struct_copy;
94 type->type_free = _struct_type_free;
95 type->definition_new = _struct_definition_new;
96 type->definition_free = _struct_definition_free;
97 type->ref = 1;
98 return struct_type;
99 }
100
101 static
102 struct definition *
103 _struct_definition_new(struct type *type,
104 struct definition_scope *parent_scope)
105 {
106 struct type_struct *struct_type =
107 container_of(type, struct type_struct, p);
108 struct definition_struct *_struct;
109 unsigned long i;
110 int ret;
111
112 _struct = g_new(struct definition_struct, 1);
113 type_ref(&struct_type->p);
114 _struct->p.type = type;
115 _struct->type = struct_type;
116 _struct->p.ref = 1;
117 _struct->scope = new_definition_scope(parent_scope);
118 _struct->fields = g_array_sized_new(FALSE, TRUE,
119 sizeof(struct field),
120 DEFAULT_NR_STRUCT_FIELDS);
121 g_array_set_size(_struct->fields, struct_type->fields->len);
122 for (i = 0; i < struct_type->fields->len; i++) {
123 struct type_field *type_field =
124 &g_array_index(struct_type->fields,
125 struct type_field, i);
126 struct field *field = &g_array_index(_struct->fields,
127 struct field, i);
128
129 field->name = type_field->name;
130 field->definition =
131 type_field->type->definition_new(type_field->type,
132 _struct->scope);
133 ret = register_field_definition(field->name,
134 field->definition,
135 _struct->scope);
136 assert(!ret);
137 }
138 return &_struct->p;
139 }
140
141 static
142 void _struct_definition_free(struct definition *definition)
143 {
144 struct definition_struct *_struct =
145 container_of(definition, struct definition_struct, p);
146 unsigned long i;
147
148 assert(_struct->fields->len == _struct->type->fields->len);
149 for (i = 0; i < _struct->fields->len; i++) {
150 struct field *field = &g_array_index(_struct->fields,
151 struct field, i);
152 definition_unref(field->definition);
153 }
154 free_definition_scope(_struct->scope);
155 type_unref(_struct->p.type);
156 g_free(_struct);
157 }
158
159 void struct_type_add_field(struct type_struct *struct_type,
160 const char *field_name,
161 struct type *field_type)
162 {
163 struct type_field *field;
164 unsigned long index;
165
166 g_array_set_size(struct_type->fields, struct_type->fields->len + 1);
167 index = struct_type->fields->len - 1; /* last field (new) */
168 field = &g_array_index(struct_type->fields, struct type_field, index);
169 field->name = g_quark_from_string(field_name);
170 type_ref(field_type);
171 field->type = field_type;
172 /* Keep index in hash rather than pointer, because array can relocate */
173 g_hash_table_insert(struct_type->fields_by_name,
174 (gpointer) (unsigned long) field->name,
175 (gpointer) index);
176 /*
177 * Alignment of structure is the max alignment of types contained
178 * therein.
179 */
180 struct_type->p.alignment = max(struct_type->p.alignment,
181 field_type->alignment);
182 }
183
184 unsigned long
185 struct_type_lookup_field_index(struct type_struct *struct_type,
186 GQuark field_name)
187 {
188 unsigned long index;
189
190 index = (unsigned long) g_hash_table_lookup(struct_type->fields_by_name,
191 (gconstpointer) (unsigned long) field_name);
192 return index;
193 }
194
195 /*
196 * field returned only valid as long as the field structure is not appended to.
197 */
198 struct type_field *
199 struct_type_get_field_from_index(struct type_struct *struct_type,
200 unsigned long index)
201 {
202 return &g_array_index(struct_type->fields, struct type_field, index);
203 }
204
205 /*
206 * field returned only valid as long as the field structure is not appended to.
207 */
208 struct field *
209 struct_definition_get_field_from_index(struct definition_struct *_struct,
210 unsigned long index)
211 {
212 return &g_array_index(_struct->fields, struct field, index);
213 }
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