3 /* ddt_new - creation/deletion of datatypes structs (private to this module)*/
5 /* Authors: Olivier Aumage, Martin Quinson */
6 /* Copyright (C) 2003, 2004 the GRAS posse. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "DataDesc/datadesc_private.h"
13 GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(new,DataDesc);
16 gras_ddt_new(const char *name,
17 gras_datadesc_type_t **dst) {
19 gras_datadesc_type_t *res=malloc(sizeof(gras_datadesc_type_t));
23 memset(res, 0, sizeof(res));
24 res->name = strdup(name);
31 * gras_ddt_new_scalar:
33 * Create a new scalar and give a pointer to it
36 gras_ddt_new_scalar(const char *name,
38 enum e_gras_dd_scalar_encoding encoding,
39 gras_datadesc_type_cb_void_t cb,
40 gras_datadesc_type_t **dst) {
43 gras_datadesc_type_t *res;
45 TRY(gras_ddt_new(name,dst));
48 res->size = size>0 ? size : 0;
54 /* just in case you wonder, x>>1 == x/2 on all architecture when x>=0 */
56 /* make sure mask have all the bits under the biggest one of size set to 1
57 Example: size=000100101 => mask=0000111111 */
62 if (size & (mask >> 1)) { /* if size have bits to one beside its biggest */
63 /* size is not a power of 2 */
64 /* alignment= next power of 2 after size */
65 res->alignment = (size & ~(mask >> 1)) << 1;
66 gras_assert0(res->alignment != 0,
67 "scalar type too large");
69 res->aligned_size = aligned(size, res->alignment);
70 gras_assert0 (res->aligned_size >= 0,
71 "scalar type too large");
74 /* size is a power of 2, life is great */
75 res->alignment = size;
76 res->aligned_size = size;
81 res->aligned_size = 0;
84 res->category_code = e_gras_datadesc_type_cat_scalar;
85 res->category.scalar_data.encoding = encoding;
93 * gras_dd_cat_field_free:
95 * Frees one struct or union field
97 void gras_dd_cat_field_free(void *f) {
98 gras_dd_cat_field_t *field = (gras_dd_cat_field_t *)f;
107 * gras_ddt_new_struct:
109 * Create a new struct and give a pointer to it
112 gras_ddt_new_struct(const char *name,
113 gras_datadesc_type_cb_void_t pre,
114 gras_datadesc_type_cb_void_t post,
115 gras_datadesc_type_t **dst) {
117 gras_error_t errcode;
118 gras_datadesc_type_t *res;
120 TRY(gras_ddt_new(name,dst));
125 res->aligned_size = 0;
126 res->category_code = e_gras_datadesc_type_cat_struct;
127 TRY(gras_dynar_new(&(res->category.struct_data.fields),
128 sizeof(gras_dd_cat_field_t*),
129 &gras_dd_cat_field_free));
137 * gras_ddt_new_struct_append:
139 * Append a field to the struct
142 gras_ddt_new_struct_append(gras_datadesc_type_t *struct_type,
144 gras_datadesc_type_t *field_type,
145 gras_datadesc_type_cb_void_t pre,
146 gras_datadesc_type_cb_void_t post) {
148 gras_error_t errcode;
149 gras_dd_cat_field_t *field;
151 gras_assert0(field_type->size >= 0,
152 "Cannot add a dynamically sized field in a structure");
154 field=malloc(sizeof(gras_dd_cat_field_t));
158 field->name = strdup(name);
159 field->offset = aligned(struct_type->size, field_type->alignment);
160 field->code = field_type->code;
164 TRY(gras_dynar_push(struct_type->category.struct_data.fields, field));
166 struct_type->size = field->offset + field_type->size;
167 struct_type->alignment = max(struct_type->alignment, field_type->alignment);
168 struct_type->aligned_size = aligned(struct_type->size, struct_type->alignment);
174 * gras_ddt_new_union:
176 * Create a new union and give a pointer to it
179 gras_ddt_new_union(const char *name,
180 gras_datadesc_type_cb_int_t field_count,
181 gras_datadesc_type_cb_void_t post,
182 gras_datadesc_type_t **dst) {
184 gras_error_t errcode;
185 gras_datadesc_type_t *res;
187 gras_assert0(field_count,
188 "Attempt to creat an union without field_count function");
190 TRY(gras_ddt_new(name,dst));
195 res->aligned_size = 0;
196 res->category_code = e_gras_datadesc_type_cat_union;
197 TRY(gras_dynar_new(&(res->category.union_data.fields),
198 sizeof(gras_dd_cat_field_t*),
199 &gras_dd_cat_field_free));
200 res->category.union_data.field_count = field_count;
208 * gras_ddt_new_union_append:
210 * Append a field to the union
213 gras_ddt_new_union_append(gras_datadesc_type_t *union_type,
215 gras_datadesc_type_t *field_type,
216 gras_datadesc_type_cb_void_t pre,
217 gras_datadesc_type_cb_void_t post) {
219 gras_error_t errcode;
220 gras_dd_cat_field_t *field;
222 gras_assert0(field_type->size >= 0,
223 "Cannot add a dynamically sized field in an union");
225 field=malloc(sizeof(gras_dd_cat_field_t));
229 field->name = strdup(name);
230 field->offset = 0; /* that's the purpose of union ;) */
231 field->code = field_type->code;
235 TRY(gras_dynar_push(union_type->category.union_data.fields, field));
237 union_type->size = max(union_type->size, field_type->size);
238 union_type->alignment = max(union_type->alignment, field_type->alignment);
239 union_type->aligned_size = aligned(union_type->size, union_type->alignment);
247 * Create a new ref and give a pointer to it
250 gras_ddt_new_ref(const char *name,
251 gras_datadesc_type_t *referenced_type,
252 gras_datadesc_type_cb_int_t discriminant,
253 gras_datadesc_type_cb_void_t post,
254 gras_datadesc_type_t **dst) {
256 gras_error_t errcode;
257 gras_datadesc_type_t *res;
259 gras_assert0(discriminant || referenced_type,
260 "Attempt to create a generic reference without discriminant");
262 TRY(gras_ddt_new(name,dst));
265 /* FIXME: Size from bootstraping */
268 res->aligned_size = 0;
269 res->category_code = e_gras_datadesc_type_cat_ref;
271 res->category.ref_data.code = referenced_type ? referenced_type->code : -1;
272 res->category.ref_data.discriminant = discriminant;
280 * gras_ddt_new_array:
282 * Create a new array and give a pointer to it
285 gras_ddt_new_array(const char *name,
286 gras_datadesc_type_t *element_type,
288 gras_datadesc_type_cb_int_t dynamic_size,
289 gras_datadesc_type_cb_void_t post,
290 gras_datadesc_type_t **dst) {
292 gras_error_t errcode;
293 gras_datadesc_type_t *res;
295 gras_assert0(dynamic_size || fixed_size>0,
296 "Attempt to create a dynamic array without size discriminant");
298 TRY(gras_ddt_new(name,dst));
301 if (fixed_size <= 0) {
302 res->size = fixed_size;
304 res->size = fixed_size * element_type->aligned_size;
306 res->alignment = element_type->alignment;
307 res->aligned_size = fixed_size; /*FIXME: That was so in GS, but looks stupid*/
308 res->category_code = e_gras_datadesc_type_cat_array;
310 res->category.array_data.code = element_type->code;
311 res->category.array_data.fixed_size = fixed_size;
312 res->category.array_data.dynamic_size = dynamic_size;
321 * gras_ddt_new_ignored:
323 * Create a new ignored field and give a pointer to it.
325 * If you give a default value, it will be copied away so that you can free your copy.
328 gras_ddt_new_ignored(const char *name,
330 void_f_pvoid_t *free_func,
333 gras_datadesc_type_cb_void_t post,
334 gras_datadesc_type_t **dst) {
335 gras_error_t errcode;
336 gras_datadesc_type_t *res;
338 TRY(gras_ddt_new(name,dst));
341 res->size = size > 0?size:0;
342 res->alignment = alignment;
345 res->aligned_size = aligned(size, alignment);
347 res->aligned_size = 0;
350 if (default_value && res->size) {
351 res->category.ignored_data.default_value = malloc((size_t)size);
352 if (! (res->category.ignored_data.default_value) )
354 memcpy(res->category.ignored_data.default_value,
355 default_value, (size_t)size);
358 res->category_code = e_gras_datadesc_type_cat_ignored;
359 res->category.ignored_data.free_func = free_func;
372 * Frees a datadescription.
374 void gras_ddt_free(gras_datadesc_type_t **type) {
375 gras_datadesc_type_t *t;
381 switch (t->category_code) {
382 case e_gras_datadesc_type_cat_scalar:
383 case e_gras_datadesc_type_cat_ref:
384 case e_gras_datadesc_type_cat_array:
385 /* nothing to free in there */
388 case e_gras_datadesc_type_cat_ignored:
389 if (t->category.ignored_data.free_func) {
390 t->category.ignored_data.free_func(t->category.ignored_data.default_value);
394 case e_gras_datadesc_type_cat_struct:
395 gras_dynar_free(t->category.struct_data.fields);
398 case e_gras_datadesc_type_cat_union:
399 gras_dynar_free(t->category.union_data.fields);
403 /* datadesc was invalid. Killing it is like euthanasy, I guess */