Definition scope: update
[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 declaration *declaration,
28 struct definition_scope *parent_scope,
29 GQuark field_name, int index);
30 static
31 void _struct_definition_free(struct definition *definition);
32
33 void struct_copy(struct stream_pos *dest, const struct format *fdest,
34 struct stream_pos *src, const struct format *fsrc,
35 struct definition *definition)
36 {
37 struct definition_struct *_struct =
38 container_of(definition, struct definition_struct, p);
39 struct declaration_struct *struct_declaration = _struct->declaration;
40 unsigned long i;
41
42 fsrc->struct_begin(src, struct_declaration);
43 fdest->struct_begin(dest, struct_declaration);
44
45 for (i = 0; i < _struct->fields->len; i++) {
46 struct field *field = &g_array_index(_struct->fields,
47 struct field, i);
48 struct declaration *field_declaration = field->definition->declaration;
49
50 field_declaration->copy(dest, fdest, src, fsrc, field->definition);
51
52 }
53 fsrc->struct_end(src, struct_declaration);
54 fdest->struct_end(dest, struct_declaration);
55 }
56
57 static
58 void _struct_declaration_free(struct declaration *declaration)
59 {
60 struct declaration_struct *struct_declaration =
61 container_of(declaration, struct declaration_struct, p);
62 unsigned long i;
63
64 free_declaration_scope(struct_declaration->scope);
65 g_hash_table_destroy(struct_declaration->fields_by_name);
66
67 for (i = 0; i < struct_declaration->fields->len; i++) {
68 struct declaration_field *declaration_field =
69 &g_array_index(struct_declaration->fields,
70 struct declaration_field, i);
71 declaration_unref(declaration_field->declaration);
72 }
73 g_array_free(struct_declaration->fields, true);
74 g_free(struct_declaration);
75 }
76
77 struct declaration_struct *struct_declaration_new(const char *name,
78 struct declaration_scope *parent_scope)
79 {
80 struct declaration_struct *struct_declaration;
81 struct declaration *declaration;
82
83 struct_declaration = g_new(struct declaration_struct, 1);
84 declaration = &struct_declaration->p;
85 struct_declaration->fields_by_name = g_hash_table_new(g_direct_hash,
86 g_direct_equal);
87 struct_declaration->fields = g_array_sized_new(FALSE, TRUE,
88 sizeof(struct declaration_field),
89 DEFAULT_NR_STRUCT_FIELDS);
90 struct_declaration->scope = new_declaration_scope(parent_scope);
91 declaration->id = CTF_TYPE_STRUCT;
92 declaration->name = g_quark_from_string(name);
93 declaration->alignment = 1;
94 declaration->copy = struct_copy;
95 declaration->declaration_free = _struct_declaration_free;
96 declaration->definition_new = _struct_definition_new;
97 declaration->definition_free = _struct_definition_free;
98 declaration->ref = 1;
99 return struct_declaration;
100 }
101
102 static
103 struct definition *
104 _struct_definition_new(struct declaration *declaration,
105 struct definition_scope *parent_scope,
106 GQuark field_name, int index)
107 {
108 struct declaration_struct *struct_declaration =
109 container_of(declaration, struct declaration_struct, p);
110 struct definition_struct *_struct;
111 unsigned long i;
112 int ret;
113
114 _struct = g_new(struct definition_struct, 1);
115 declaration_ref(&struct_declaration->p);
116 _struct->p.declaration = declaration;
117 _struct->declaration = struct_declaration;
118 _struct->p.ref = 1;
119 _struct->p.index = index;
120 _struct->scope = new_definition_scope(parent_scope, field_name);
121 _struct->fields = g_array_sized_new(FALSE, TRUE,
122 sizeof(struct field),
123 DEFAULT_NR_STRUCT_FIELDS);
124 g_array_set_size(_struct->fields, struct_declaration->fields->len);
125 for (i = 0; i < struct_declaration->fields->len; i++) {
126 struct declaration_field *declaration_field =
127 &g_array_index(struct_declaration->fields,
128 struct declaration_field, i);
129 struct field *field = &g_array_index(_struct->fields,
130 struct field, i);
131
132 field->name = declaration_field->name;
133 field->definition =
134 declaration_field->declaration->definition_new(declaration_field->declaration,
135 _struct->scope,
136 field->name, i);
137 ret = register_field_definition(field->name,
138 field->definition,
139 _struct->scope);
140 assert(!ret);
141 }
142 return &_struct->p;
143 }
144
145 static
146 void _struct_definition_free(struct definition *definition)
147 {
148 struct definition_struct *_struct =
149 container_of(definition, struct definition_struct, p);
150 unsigned long i;
151
152 assert(_struct->fields->len == _struct->declaration->fields->len);
153 for (i = 0; i < _struct->fields->len; i++) {
154 struct field *field = &g_array_index(_struct->fields,
155 struct field, i);
156 definition_unref(field->definition);
157 }
158 free_definition_scope(_struct->scope);
159 declaration_unref(_struct->p.declaration);
160 g_free(_struct);
161 }
162
163 void struct_declaration_add_field(struct declaration_struct *struct_declaration,
164 const char *field_name,
165 struct declaration *field_declaration)
166 {
167 struct declaration_field *field;
168 unsigned long index;
169
170 g_array_set_size(struct_declaration->fields, struct_declaration->fields->len + 1);
171 index = struct_declaration->fields->len - 1; /* last field (new) */
172 field = &g_array_index(struct_declaration->fields, struct declaration_field, index);
173 field->name = g_quark_from_string(field_name);
174 declaration_ref(field_declaration);
175 field->declaration = field_declaration;
176 /* Keep index in hash rather than pointer, because array can relocate */
177 g_hash_table_insert(struct_declaration->fields_by_name,
178 (gpointer) (unsigned long) field->name,
179 (gpointer) index);
180 /*
181 * Alignment of structure is the max alignment of declarations contained
182 * therein.
183 */
184 struct_declaration->p.alignment = max(struct_declaration->p.alignment,
185 field_declaration->alignment);
186 }
187
188 unsigned long
189 struct_declaration_lookup_field_index(struct declaration_struct *struct_declaration,
190 GQuark field_name)
191 {
192 unsigned long index;
193
194 index = (unsigned long) g_hash_table_lookup(struct_declaration->fields_by_name,
195 (gconstpointer) (unsigned long) field_name);
196 return index;
197 }
198
199 /*
200 * field returned only valid as long as the field structure is not appended to.
201 */
202 struct declaration_field *
203 struct_declaration_get_field_from_index(struct declaration_struct *struct_declaration,
204 unsigned long index)
205 {
206 return &g_array_index(struct_declaration->fields, struct declaration_field, index);
207 }
208
209 /*
210 * field returned only valid as long as the field structure is not appended to.
211 */
212 struct field *
213 struct_definition_get_field_from_index(struct definition_struct *_struct,
214 unsigned long index)
215 {
216 return &g_array_index(_struct->fields, struct field, index);
217 }
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