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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 *
c054553d 6 * Copyright 2010, 2011 - 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>
11796b96 21
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22#ifndef max
23#define max(a, b) ((a) < (b) ? (b) : (a))
24#endif
25
c054553d 26static
f6625916 27struct definition *_struct_definition_new(struct declaration *declaration,
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28 struct definition_scope *parent_scope,
29 GQuark field_name, int index);
c054553d 30static
e1151715 31void _struct_definition_free(struct definition *definition);
c054553d 32
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33void struct_copy(struct stream_pos *dest, const struct format *fdest,
34 struct stream_pos *src, const struct format *fsrc,
e1151715 35 struct definition *definition)
11796b96 36{
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37 struct definition_struct *_struct =
38 container_of(definition, struct definition_struct, p);
f6625916 39 struct declaration_struct *struct_declaration = _struct->declaration;
c054553d 40 unsigned long i;
11796b96 41
f6625916 42 fsrc->struct_begin(src, struct_declaration);
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43 if (fdest)
44 fdest->struct_begin(dest, struct_declaration);
11796b96 45
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46 for (i = 0; i < _struct->fields->len; i++) {
47 struct field *field = &g_array_index(_struct->fields,
11796b96 48 struct field, i);
f6625916 49 struct declaration *field_declaration = field->definition->declaration;
11796b96 50
f6625916 51 field_declaration->copy(dest, fdest, src, fsrc, field->definition);
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52
53 }
f6625916 54 fsrc->struct_end(src, struct_declaration);
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55 if (fdest)
56 fdest->struct_end(dest, struct_declaration);
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57}
58
c054553d 59static
f6625916 60void _struct_declaration_free(struct declaration *declaration)
11796b96 61{
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62 struct declaration_struct *struct_declaration =
63 container_of(declaration, struct declaration_struct, p);
c054553d 64 unsigned long i;
4c8bfb7e 65
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66 free_declaration_scope(struct_declaration->scope);
67 g_hash_table_destroy(struct_declaration->fields_by_name);
4c8bfb7e 68
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69 for (i = 0; i < struct_declaration->fields->len; i++) {
70 struct declaration_field *declaration_field =
71 &g_array_index(struct_declaration->fields,
72 struct declaration_field, i);
73 declaration_unref(declaration_field->declaration);
4c8bfb7e 74 }
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75 g_array_free(struct_declaration->fields, true);
76 g_free(struct_declaration);
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77}
78
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79struct declaration_struct *
80 struct_declaration_new(struct declaration_scope *parent_scope)
11796b96 81{
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82 struct declaration_struct *struct_declaration;
83 struct declaration *declaration;
11796b96 84
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85 struct_declaration = g_new(struct declaration_struct, 1);
86 declaration = &struct_declaration->p;
87 struct_declaration->fields_by_name = g_hash_table_new(g_direct_hash,
e19c3d69 88 g_direct_equal);
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89 struct_declaration->fields = g_array_sized_new(FALSE, TRUE,
90 sizeof(struct declaration_field),
e19c3d69 91 DEFAULT_NR_STRUCT_FIELDS);
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92 struct_declaration->scope = new_declaration_scope(parent_scope);
93 declaration->id = CTF_TYPE_STRUCT;
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94 declaration->alignment = 1;
95 declaration->copy = struct_copy;
96 declaration->declaration_free = _struct_declaration_free;
97 declaration->definition_new = _struct_definition_new;
98 declaration->definition_free = _struct_definition_free;
99 declaration->ref = 1;
100 return struct_declaration;
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101}
102
c054553d 103static
e1151715 104struct definition *
f6625916 105 _struct_definition_new(struct declaration *declaration,
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106 struct definition_scope *parent_scope,
107 GQuark field_name, int index)
11796b96 108{
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109 struct declaration_struct *struct_declaration =
110 container_of(declaration, struct declaration_struct, p);
e1151715 111 struct definition_struct *_struct;
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112 unsigned long i;
113 int ret;
c054553d 114
e1151715 115 _struct = g_new(struct definition_struct, 1);
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116 declaration_ref(&struct_declaration->p);
117 _struct->p.declaration = declaration;
118 _struct->declaration = struct_declaration;
c054553d 119 _struct->p.ref = 1;
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120 _struct->p.index = index;
121 _struct->scope = new_definition_scope(parent_scope, field_name);
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122 _struct->fields = g_array_sized_new(FALSE, TRUE,
123 sizeof(struct field),
124 DEFAULT_NR_STRUCT_FIELDS);
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125 g_array_set_size(_struct->fields, struct_declaration->fields->len);
126 for (i = 0; i < struct_declaration->fields->len; i++) {
127 struct declaration_field *declaration_field =
128 &g_array_index(struct_declaration->fields,
129 struct declaration_field, i);
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130 struct field *field = &g_array_index(_struct->fields,
131 struct field, i);
132
f6625916 133 field->name = declaration_field->name;
e1151715 134 field->definition =
f6625916 135 declaration_field->declaration->definition_new(declaration_field->declaration,
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136 _struct->scope,
137 field->name, i);
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138 ret = register_field_definition(field->name,
139 field->definition,
140 _struct->scope);
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141 assert(!ret);
142 }
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143 return &_struct->p;
144}
145
146static
e1151715 147void _struct_definition_free(struct definition *definition)
c054553d 148{
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149 struct definition_struct *_struct =
150 container_of(definition, struct definition_struct, p);
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151 unsigned long i;
152
f6625916 153 assert(_struct->fields->len == _struct->declaration->fields->len);
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154 for (i = 0; i < _struct->fields->len; i++) {
155 struct field *field = &g_array_index(_struct->fields,
156 struct field, i);
e1151715 157 definition_unref(field->definition);
c054553d 158 }
e1151715 159 free_definition_scope(_struct->scope);
f6625916 160 declaration_unref(_struct->p.declaration);
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161 g_free(_struct);
162}
163
f6625916 164void struct_declaration_add_field(struct declaration_struct *struct_declaration,
e19c3d69 165 const char *field_name,
f6625916 166 struct declaration *field_declaration)
c054553d 167{
f6625916 168 struct declaration_field *field;
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169 unsigned long index;
170
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171 g_array_set_size(struct_declaration->fields, struct_declaration->fields->len + 1);
172 index = struct_declaration->fields->len - 1; /* last field (new) */
173 field = &g_array_index(struct_declaration->fields, struct declaration_field, index);
11796b96 174 field->name = g_quark_from_string(field_name);
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175 declaration_ref(field_declaration);
176 field->declaration = field_declaration;
11796b96 177 /* Keep index in hash rather than pointer, because array can relocate */
f6625916 178 g_hash_table_insert(struct_declaration->fields_by_name,
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179 (gpointer) (unsigned long) field->name,
180 (gpointer) index);
181 /*
f6625916 182 * Alignment of structure is the max alignment of declarations contained
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183 * therein.
184 */
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185 struct_declaration->p.alignment = max(struct_declaration->p.alignment,
186 field_declaration->alignment);
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187}
188
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189/*
190 * struct_declaration_lookup_field_index - returns field index
191 *
192 * Returns the index of a field in a structure, or -1 if it does not
193 * exist.
194 */
195int struct_declaration_lookup_field_index(struct declaration_struct *struct_declaration,
e19c3d69 196 GQuark field_name)
11796b96 197{
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198 gpointer index;
199 gboolean found;
200
201 found = g_hash_table_lookup_extended(struct_declaration->fields_by_name,
202 (gconstpointer) (unsigned long) field_name,
203 NULL, &index);
204 if (!found)
205 return -1;
206 return (int) (unsigned long) index;
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207}
208
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209/*
210 * field returned only valid as long as the field structure is not appended to.
211 */
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212struct declaration_field *
213 struct_declaration_get_field_from_index(struct declaration_struct *struct_declaration,
0f980a35 214 int index)
c054553d 215{
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216 if (index < 0)
217 return NULL;
f6625916 218 return &g_array_index(struct_declaration->fields, struct declaration_field, index);
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219}
220
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221/*
222 * field returned only valid as long as the field structure is not appended to.
223 */
224struct field *
e1151715 225struct_definition_get_field_from_index(struct definition_struct *_struct,
0f980a35 226 int index)
11796b96 227{
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228 if (index < 0)
229 return NULL;
e19c3d69 230 return &g_array_index(_struct->fields, struct field, index);
11796b96 231}
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