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[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 declaration *_struct_declaration_new(struct type *type,
28 struct declaration_scope *parent_scope);
29 static
30 void _struct_declaration_free(struct declaration *declaration);
31
32 void struct_copy(struct stream_pos *dest, const struct format *fdest,
33 struct stream_pos *src, const struct format *fsrc,
34 struct declaration *declaration)
35 {
36 struct declaration_struct *_struct =
37 container_of(declaration, struct declaration_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->declaration->type;
48
49 field_type->copy(dest, fdest, src, fsrc, field->declaration);
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 g_hash_table_destroy(struct_type->fields_by_name);
64
65 for (i = 0; i < struct_type->fields->len; i++) {
66 struct type_field *type_field =
67 &g_array_index(struct_type->fields,
68 struct type_field, i);
69 type_unref(type_field->type);
70 }
71 g_array_free(struct_type->fields, true);
72 g_free(struct_type);
73 }
74
75 struct type_struct *struct_type_new(const char *name)
76 {
77 struct type_struct *struct_type;
78 struct type *type;
79
80 struct_type = g_new(struct type_struct, 1);
81 type = &struct_type->p;
82 struct_type->fields_by_name = g_hash_table_new(g_direct_hash,
83 g_direct_equal);
84 struct_type->fields = g_array_sized_new(FALSE, TRUE,
85 sizeof(struct type_field),
86 DEFAULT_NR_STRUCT_FIELDS);
87 type->name = g_quark_from_string(name);
88 type->alignment = 1;
89 type->copy = struct_copy;
90 type->type_free = _struct_type_free;
91 type->declaration_new = _struct_declaration_new;
92 type->declaration_free = _struct_declaration_free;
93 type->ref = 1;
94 return struct_type;
95 }
96
97 static
98 struct declaration *
99 _struct_declaration_new(struct type *type,
100 struct declaration_scope *parent_scope)
101 {
102 struct type_struct *struct_type =
103 container_of(type, struct type_struct, p);
104 struct declaration_struct *_struct;
105
106 _struct = g_new(struct declaration_struct, 1);
107 type_ref(&struct_type->p);
108 _struct->p.type = type;
109 _struct->type = struct_type;
110 _struct->p.ref = 1;
111 _struct->scope = new_declaration_scope(parent_scope);
112 _struct->fields = g_array_sized_new(FALSE, TRUE,
113 sizeof(struct field),
114 DEFAULT_NR_STRUCT_FIELDS);
115 return &_struct->p;
116 }
117
118 static
119 void _struct_declaration_free(struct declaration *declaration)
120 {
121 struct declaration_struct *_struct =
122 container_of(declaration, struct declaration_struct, p);
123 unsigned long i;
124
125 for (i = 0; i < _struct->fields->len; i++) {
126 struct field *field = &g_array_index(_struct->fields,
127 struct field, i);
128 declaration_unref(field->declaration);
129 }
130 free_declaration_scope(_struct->scope);
131 type_unref(_struct->p.type);
132 g_free(_struct);
133 }
134
135 void struct_type_add_field(struct type_struct *struct_type,
136 const char *field_name,
137 struct type *field_type)
138 {
139 struct type_field *field;
140 unsigned long index;
141
142 g_array_set_size(struct_type->fields, struct_type->fields->len + 1);
143 index = struct_type->fields->len - 1; /* last field (new) */
144 field = &g_array_index(struct_type->fields, struct type_field, index);
145 field->name = g_quark_from_string(field_name);
146 type_ref(field_type);
147 field->type = field_type;
148 /* Keep index in hash rather than pointer, because array can relocate */
149 g_hash_table_insert(struct_type->fields_by_name,
150 (gpointer) (unsigned long) field->name,
151 (gpointer) index);
152 /*
153 * Alignment of structure is the max alignment of types contained
154 * therein.
155 */
156 struct_type->p.alignment = max(struct_type->p.alignment,
157 field_type->alignment);
158 }
159
160 unsigned long
161 struct_type_lookup_field_index(struct type_struct *struct_type,
162 GQuark field_name)
163 {
164 unsigned long index;
165
166 index = (unsigned long) g_hash_table_lookup(struct_type->fields_by_name,
167 (gconstpointer) (unsigned long) field_name);
168 return index;
169 }
170
171 /*
172 * field returned only valid as long as the field structure is not appended to.
173 */
174 struct type_field *
175 struct_type_get_field_from_index(struct type_struct *struct_type,
176 unsigned long index)
177 {
178 return &g_array_index(struct_type->fields, struct type_field, index);
179 }
180
181 /*
182 * field returned only valid as long as the field structure is not appended to.
183 */
184 struct field *
185 struct_declaration_get_field_from_index(struct declaration_struct *_struct,
186 unsigned long index)
187 {
188 return &g_array_index(_struct->fields, struct field, index);
189 }
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