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Add g_type_interface_prerequisites.
[glib.git] / gobject / gtype.c
blobf9d0edd4e8d1ba01c628a757c254631fedfd0e44
1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19 #include "gtype.h"
20
21 /*
22 * MT safe
23 */
24
25 #include "gtypeplugin.h"
26 #include "gvaluecollector.h"
27 #include <string.h>
28
29
30 /* NOTE: some functions (some internal variants and exported ones)
31 * invalidate data portions of the TypeNodes. if external functions/callbacks
32 * are called, pointers to memory maintained by TypeNodes have to be looked up
33 * again. this affects most of the struct TypeNode fields, e.g. ->children or
34 * CLASSED_NODE_IFACES_ENTRIES() respectively IFACE_NODE_PREREQUISITES() (but
35 * not ->supers[]), as all those memory portions can get realloc()ed during
36 * callback invocation.
37 *
38 * TODO:
39 * - g_type_from_name() should do an ordered array lookup after fetching the
40 * the quark, instead of a second hashtable lookup.
41 *
42 * LOCKING:
43 * lock handling issues when calling static functions are indicated by
44 * uppercase letter postfixes, all static functions have to have
45 * one of the below postfixes:
46 * - _I: [Indifferent about locking]
47 * function doesn't care about locks at all
48 * - _U: [Unlocked invocation]
49 * no read or write lock has to be held across function invocation
50 * (locks may be acquired and released during invocation though)
51 * - _L: [Locked invocation]
52 * a write lock or more than 0 read locks have to be held across
53 * function invocation
54 * - _W: [Write-locked invocation]
55 * a write lock has to be held across function invokation
56 * - _Wm: [Write-locked invocation, mutatable]
57 * like _W, but the write lock might be released and reacquired
58 * during invocation, watch your pointers
59 */
60
61 static GStaticRWLock type_rw_lock = G_STATIC_RW_LOCK_INIT;
62 #ifdef LOCK_DEBUG
63 #define G_READ_LOCK(rw_lock) do { g_printerr (G_STRLOC ": readL++\n"); g_static_rw_lock_reader_lock (rw_lock); } while (0)
64 #define G_READ_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": readL--\n"); g_static_rw_lock_reader_unlock (rw_lock); } while (0)
65 #define G_WRITE_LOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL++\n"); g_static_rw_lock_writer_lock (rw_lock); } while (0)
66 #define G_WRITE_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL--\n"); g_static_rw_lock_writer_unlock (rw_lock); } while (0)
67 #else
68 #define G_READ_LOCK(rw_lock) g_static_rw_lock_reader_lock (rw_lock)
69 #define G_READ_UNLOCK(rw_lock) g_static_rw_lock_reader_unlock (rw_lock)
70 #define G_WRITE_LOCK(rw_lock) g_static_rw_lock_writer_lock (rw_lock)
71 #define G_WRITE_UNLOCK(rw_lock) g_static_rw_lock_writer_unlock (rw_lock)
72 #endif
73 #define INVALID_RECURSION(func, arg, type_name) G_STMT_START{ \
74 static const gchar *_action = " invalidly modified type "; \
75 gpointer _arg = (gpointer) (arg); const gchar *_tname = (type_name), *_fname = (func); \
76 if (_arg) \
77 g_error ("%s(%p)%s`%s'", _fname, _arg, _action, _tname); \
78 else \
79 g_error ("%s()%s`%s'", _fname, _action, _tname); \
80 }G_STMT_END
81 #define g_return_val_if_uninitialized(condition, init_function, return_value) G_STMT_START{ \
82 if (!(condition)) \
83 { \
84 g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
85 "%s: initialization assertion failed, use %s() prior to this function", \
86 G_STRLOC, G_STRINGIFY (init_function)); \
87 return (return_value); \
88 } \
89 }G_STMT_END
90
91 #ifdef G_ENABLE_DEBUG
92 #define DEBUG_CODE(debug_type, code_block) G_STMT_START { \
93 if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) \
94 { code_block; } \
95 } G_STMT_END
96 #else /* !G_ENABLE_DEBUG */
97 #define DEBUG_CODE(debug_type, code_block) /* code_block */
98 #endif /* G_ENABLE_DEBUG */
99
100 #define TYPE_FUNDAMENTAL_FLAG_MASK (G_TYPE_FLAG_CLASSED | \
101 G_TYPE_FLAG_INSTANTIATABLE | \
102 G_TYPE_FLAG_DERIVABLE | \
103 G_TYPE_FLAG_DEEP_DERIVABLE)
104 #define TYPE_FLAG_MASK (G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT)
105 #define SIZEOF_FUNDAMENTAL_INFO ((gssize) MAX (MAX (sizeof (GTypeFundamentalInfo), \
106 sizeof (gpointer)), \
107 sizeof (glong)))
108
109
110 /* --- typedefs --- */
111 typedef struct _TypeNode TypeNode;
112 typedef struct _CommonData CommonData;
113 typedef struct _IFaceData IFaceData;
114 typedef struct _ClassData ClassData;
115 typedef struct _InstanceData InstanceData;
116 typedef union _TypeData TypeData;
117 typedef struct _IFaceEntry IFaceEntry;
118 typedef struct _IFaceHolder IFaceHolder;
119
120
121 /* --- prototypes --- */
122 static inline GTypeFundamentalInfo* type_node_fundamental_info_I (TypeNode *node);
123 static void type_add_flags_W (TypeNode *node,
124 GTypeFlags flags);
125 static void type_data_make_W (TypeNode *node,
126 const GTypeInfo *info,
127 const GTypeValueTable *value_table);
128 static inline void type_data_ref_Wm (TypeNode *node);
129 static inline void type_data_unref_Wm (TypeNode *node,
130 gboolean uncached);
131 static void type_data_last_unref_Wm (GType type,
132 gboolean uncached);
133 static inline gpointer type_get_qdata_L (TypeNode *node,
134 GQuark quark);
135 static inline void type_set_qdata_W (TypeNode *node,
136 GQuark quark,
137 gpointer data);
138 static IFaceHolder* type_iface_peek_holder_L (TypeNode *iface,
139 GType instance_type);
140 static gboolean type_node_is_a_L (TypeNode *node,
141 TypeNode *iface_node);
142
143
144 /* --- structures --- */
145 struct _TypeNode
146 {
147 GTypePlugin *plugin;
148 guint n_children : 12;
149 guint n_supers : 8;
150 guint _prot_n_ifaces_prerequisites : 9;
151 guint is_classed : 1;
152 guint is_instantiatable : 1;
153 guint mutatable_check_cache : 1; /* combines some common path checks */
154 GType *children;
155 TypeData * volatile data;
156 GQuark qname;
157 GData *global_gdata;
158 union {
159 IFaceEntry *iface_entries; /* for !iface types */
160 GType *prerequisistes;
161 } _prot;
162 GType supers[1]; /* flexible array */
163 };
164 #define SIZEOF_BASE_TYPE_NODE() (G_STRUCT_OFFSET (TypeNode, supers))
165 #define MAX_N_SUPERS (255)
166 #define MAX_N_CHILDREN (4095)
167 #define MAX_N_IFACES (511)
168 #define MAX_N_PREREQUISITES (MAX_N_IFACES)
169 #define NODE_TYPE(node) (node->supers[0])
170 #define NODE_PARENT_TYPE(node) (node->supers[1])
171 #define NODE_FUNDAMENTAL_TYPE(node) (node->supers[node->n_supers])
172 #define NODE_NAME(node) (g_quark_to_string (node->qname))
173 #define NODE_IS_IFACE(node) (NODE_FUNDAMENTAL_TYPE (node) == G_TYPE_INTERFACE)
174 #define CLASSED_NODE_N_IFACES(node) ((node)->_prot_n_ifaces_prerequisites)
175 #define CLASSED_NODE_IFACES_ENTRIES(node) ((node)->_prot.iface_entries)
176 #define IFACE_NODE_N_PREREQUISITES(node) ((node)->_prot_n_ifaces_prerequisites)
177 #define IFACE_NODE_PREREQUISITES(node) ((node)->_prot.prerequisistes)
178 #define iface_node_get_holders_L(node) ((IFaceHolder*) type_get_qdata_L ((node), static_quark_iface_holder))
179 #define iface_node_set_holders_W(node, holders) (type_set_qdata_W ((node), static_quark_iface_holder, (holders)))
180 #define iface_node_get_dependants_array_L(n) ((GType*) type_get_qdata_L ((n), static_quark_dependants_array))
181 #define iface_node_set_dependants_array_W(n,d) (type_set_qdata_W ((n), static_quark_dependants_array, (d)))
182 #define TYPE_ID_MASK ((GType) ((1 << G_TYPE_FUNDAMENTAL_SHIFT) - 1))
183
184
185 struct _IFaceHolder
186 {
187 GType instance_type;
188 GInterfaceInfo *info;
189 GTypePlugin *plugin;
190 IFaceHolder *next;
191 };
192 struct _IFaceEntry
193 {
194 GType iface_type;
195 GTypeInterface *vtable;
196 };
197 struct _CommonData
198 {
199 guint ref_count;
200 GTypeValueTable *value_table;
201 };
202 struct _IFaceData
203 {
204 CommonData common;
205 guint16 vtable_size;
206 GBaseInitFunc vtable_init_base;
207 GBaseFinalizeFunc vtable_finalize_base;
208 };
209 struct _ClassData
210 {
211 CommonData common;
212 guint16 class_size;
213 GBaseInitFunc class_init_base;
214 GBaseFinalizeFunc class_finalize_base;
215 GClassInitFunc class_init;
216 GClassFinalizeFunc class_finalize;
217 gconstpointer class_data;
218 gpointer class;
219 };
220 struct _InstanceData
221 {
222 CommonData common;
223 guint16 class_size;
224 GBaseInitFunc class_init_base;
225 GBaseFinalizeFunc class_finalize_base;
226 GClassInitFunc class_init;
227 GClassFinalizeFunc class_finalize;
228 gconstpointer class_data;
229 gpointer class;
230 guint16 instance_size;
231 guint16 n_preallocs;
232 GInstanceInitFunc instance_init;
233 GMemChunk *mem_chunk;
234 };
235 union _TypeData
236 {
237 CommonData common;
238 IFaceData iface;
239 ClassData class;
240 InstanceData instance;
241 };
242 typedef struct {
243 gpointer cache_data;
244 GTypeClassCacheFunc cache_func;
245 } ClassCacheFunc;
246
247
248 /* --- variables --- */
249 static guint static_n_class_cache_funcs = 0;
250 static ClassCacheFunc *static_class_cache_funcs = NULL;
251 static GQuark static_quark_type_flags = 0;
252 static GQuark static_quark_iface_holder = 0;
253 static GQuark static_quark_dependants_array = 0;
254 GTypeDebugFlags _g_type_debug_flags = 0;
255
256
257 /* --- type nodes --- */
258 static GHashTable *static_type_nodes_ht = NULL;
259 static TypeNode *static_fundamental_type_nodes[(G_TYPE_FUNDAMENTAL_MAX >> G_TYPE_FUNDAMENTAL_SHIFT) + 1] = { 0, };
260 static GType static_fundamental_next = G_TYPE_RESERVED_USER_FIRST;
261
262 static inline TypeNode*
263 lookup_type_node_I (register GType utype)
264 {
265 if (utype > G_TYPE_FUNDAMENTAL_MAX)
266 return (TypeNode*) (utype & ~TYPE_ID_MASK);
267 else
268 return static_fundamental_type_nodes[utype >> G_TYPE_FUNDAMENTAL_SHIFT];
269 }
270
271 static TypeNode*
272 type_node_any_new_W (TypeNode *pnode,
273 GType ftype,
274 const gchar *name,
275 GTypePlugin *plugin,
276 GTypeFundamentalFlags type_flags)
277 {
278 guint n_supers;
279 GType type;
280 TypeNode *node;
281 guint i, node_size = 0;
282
283 n_supers = pnode ? pnode->n_supers + 1 : 0;
284
285 if (!pnode)
286 node_size += SIZEOF_FUNDAMENTAL_INFO; /* fundamental type info */
287 node_size += SIZEOF_BASE_TYPE_NODE (); /* TypeNode structure */
288 node_size += (sizeof (GType) * (1 + n_supers + 1)); /* self + ancestors + (0) for ->supers[] */
289 node = g_malloc0 (node_size);
290 if (!pnode) /* offset fundamental types */
291 {
292 node = G_STRUCT_MEMBER_P (node, SIZEOF_FUNDAMENTAL_INFO);
293 static_fundamental_type_nodes[ftype >> G_TYPE_FUNDAMENTAL_SHIFT] = node;
294 type = ftype;
295 }
296 else
297 type = (GType) node;
298
299 g_assert ((type & TYPE_ID_MASK) == 0);
300
301 node->n_supers = n_supers;
302 if (!pnode)
303 {
304 node->supers[0] = type;
305 node->supers[1] = 0;
306
307 node->is_classed = (type_flags & G_TYPE_FLAG_CLASSED) != 0;
308 node->is_instantiatable = (type_flags & G_TYPE_FLAG_INSTANTIATABLE) != 0;
309
310 if (NODE_IS_IFACE (node))
311 {
312 IFACE_NODE_N_PREREQUISITES (node) = 0;
313 IFACE_NODE_PREREQUISITES (node) = NULL;
314 }
315 else
316 {
317 CLASSED_NODE_N_IFACES (node) = 0;
318 CLASSED_NODE_IFACES_ENTRIES (node) = NULL;
319 }
320 }
321 else
322 {
323 node->supers[0] = type;
324 memcpy (node->supers + 1, pnode->supers, sizeof (GType) * (1 + pnode->n_supers + 1));
325
326 node->is_classed = pnode->is_classed;
327 node->is_instantiatable = pnode->is_instantiatable;
328
329 if (NODE_IS_IFACE (node))
330 {
331 IFACE_NODE_N_PREREQUISITES (node) = 0;
332 IFACE_NODE_PREREQUISITES (node) = NULL;
333 }
334 else
335 {
336 guint j;
337
338 CLASSED_NODE_N_IFACES (node) = CLASSED_NODE_N_IFACES (pnode);
339 CLASSED_NODE_IFACES_ENTRIES (node) = g_memdup (CLASSED_NODE_IFACES_ENTRIES (pnode),
340 sizeof (CLASSED_NODE_IFACES_ENTRIES (pnode)[0]) *
341 CLASSED_NODE_N_IFACES (node));
342 for (j = 0; j < CLASSED_NODE_N_IFACES (node); j++)
343 CLASSED_NODE_IFACES_ENTRIES (node)[j].vtable = NULL;
344 }
345
346 i = pnode->n_children++;
347 pnode->children = g_renew (GType, pnode->children, pnode->n_children);
348 pnode->children[i] = type;
349 }
350
351 node->plugin = plugin;
352 node->n_children = 0;
353 node->children = NULL;
354 node->data = NULL;
355 node->qname = g_quark_from_string (name);
356 node->global_gdata = NULL;
357
358 g_hash_table_insert (static_type_nodes_ht,
359 GUINT_TO_POINTER (node->qname),
360 (gpointer) type);
361 return node;
362 }
363
364 static inline GTypeFundamentalInfo*
365 type_node_fundamental_info_I (TypeNode *node)
366 {
367 GType ftype = NODE_FUNDAMENTAL_TYPE (node);
368
369 if (ftype != NODE_TYPE (node))
370 node = lookup_type_node_I (ftype);
371
372 return node ? G_STRUCT_MEMBER_P (node, -SIZEOF_FUNDAMENTAL_INFO) : NULL;
373 }
374
375 static TypeNode*
376 type_node_fundamental_new_W (GType ftype,
377 const gchar *name,
378 GTypeFundamentalFlags type_flags)
379 {
380 GTypeFundamentalInfo *finfo;
381 TypeNode *node;
382
383 g_assert ((ftype & TYPE_ID_MASK) == 0);
384 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX);
385
386 if (ftype >> G_TYPE_FUNDAMENTAL_SHIFT == static_fundamental_next)
387 static_fundamental_next++;
388
389 type_flags &= TYPE_FUNDAMENTAL_FLAG_MASK;
390
391 node = type_node_any_new_W (NULL, ftype, name, NULL, type_flags);
392
393 finfo = type_node_fundamental_info_I (node);
394 finfo->type_flags = type_flags;
395
396 return node;
397 }
398
399 static TypeNode*
400 type_node_new_W (TypeNode *pnode,
401 const gchar *name,
402 GTypePlugin *plugin)
403
404 {
405 g_assert (pnode);
406 g_assert (pnode->n_supers < MAX_N_SUPERS);
407 g_assert (pnode->n_children < MAX_N_CHILDREN);
408
409 return type_node_any_new_W (pnode, NODE_FUNDAMENTAL_TYPE (pnode), name, plugin, 0);
410 }
411
412 static inline IFaceEntry*
413 type_lookup_iface_entry_L (TypeNode *node,
414 TypeNode *iface_node)
415 {
416 if (NODE_IS_IFACE (iface_node) && CLASSED_NODE_N_IFACES (node))
417 {
418 IFaceEntry *ifaces = CLASSED_NODE_IFACES_ENTRIES (node) - 1;
419 guint n_ifaces = CLASSED_NODE_N_IFACES (node);
420 GType iface_type = NODE_TYPE (iface_node);
421
422 do
423 {
424 guint i;
425 IFaceEntry *check;
426
427 i = (n_ifaces + 1) >> 1;
428 check = ifaces + i;
429 if (iface_type == check->iface_type)
430 return check;
431 else if (iface_type > check->iface_type)
432 {
433 n_ifaces -= i;
434 ifaces = check;
435 }
436 else /* if (iface_type < check->iface_type) */
437 n_ifaces = i - 1;
438 }
439 while (n_ifaces);
440 }
441
442 return NULL;
443 }
444
445 static inline gboolean
446 type_lookup_prerequisite_L (TypeNode *iface,
447 GType prerequisite_type)
448 {
449 if (NODE_IS_IFACE (iface) && IFACE_NODE_N_PREREQUISITES (iface))
450 {
451 GType *prerequisites = IFACE_NODE_PREREQUISITES (iface) - 1;
452 guint n_prerequisites = IFACE_NODE_N_PREREQUISITES (iface);
453
454 do
455 {
456 guint i;
457 GType *check;
458
459 i = (n_prerequisites + 1) >> 1;
460 check = prerequisites + i;
461 if (prerequisite_type == *check)
462 return TRUE;
463 else if (prerequisite_type > *check)
464 {
465 n_prerequisites -= i;
466 prerequisites = check;
467 }
468 else /* if (prerequisite_type < *check) */
469 n_prerequisites = i - 1;
470 }
471 while (n_prerequisites);
472 }
473 return FALSE;
474 }
475
476 static gchar*
477 type_descriptive_name_I (GType type)
478 {
479 if (type)
480 {
481 TypeNode *node = lookup_type_node_I (type);
482
483 return node ? NODE_NAME (node) : "<unknown>";
484 }
485 else
486 return "<invalid>";
487 }
488
489
490 /* --- type consistency checks --- */
491 static gboolean
492 check_plugin_U (GTypePlugin *plugin,
493 gboolean need_complete_type_info,
494 gboolean need_complete_interface_info,
495 const gchar *type_name)
496 {
497 /* G_IS_TYPE_PLUGIN() and G_TYPE_PLUGIN_GET_CLASS() are external calls: _U
498 */
499 if (!plugin)
500 {
501 g_warning ("plugin handle for type `%s' is NULL",
502 type_name);
503 return FALSE;
504 }
505 if (!G_IS_TYPE_PLUGIN (plugin))
506 {
507 g_warning ("plugin pointer (%p) for type `%s' is invalid",
508 plugin, type_name);
509 return FALSE;
510 }
511 if (need_complete_type_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_type_info)
512 {
513 g_warning ("plugin for type `%s' has no complete_type_info() implementation",
514 type_name);
515 return FALSE;
516 }
517 if (need_complete_interface_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_interface_info)
518 {
519 g_warning ("plugin for type `%s' has no complete_interface_info() implementation",
520 type_name);
521 return FALSE;
522 }
523 return TRUE;
524 }
525
526 static gboolean
527 check_type_name_I (const gchar *type_name)
528 {
529 static const gchar *extra_chars = "-_+";
530 const gchar *p = type_name;
531 gboolean name_valid;
532
533 if (!type_name[0] || !type_name[1] || !type_name[2])
534 {
535 g_warning ("type name `%s' is too short", type_name);
536 return FALSE;
537 }
538 /* check the first letter */
539 name_valid = (p[0] >= 'A' && p[0] <= 'Z') || (p[0] >= 'a' && p[0] <= 'z') || p[0] == '_';
540 for (p = type_name + 1; *p; p++)
541 name_valid &= ((p[0] >= 'A' && p[0] <= 'Z') ||
542 (p[0] >= 'a' && p[0] <= 'z') ||
543 (p[0] >= '0' && p[0] <= '9') ||
544 strchr (extra_chars, p[0]));
545 if (!name_valid)
546 {
547 g_warning ("type name `%s' contains invalid characters", type_name);
548 return FALSE;
549 }
550 if (g_type_from_name (type_name))
551 {
552 g_warning ("cannot register existing type `%s'", type_name);
553 return FALSE;
554 }
555
556 return TRUE;
557 }
558
559 static gboolean
560 check_derivation_I (GType parent_type,
561 const gchar *type_name)
562 {
563 TypeNode *pnode;
564 GTypeFundamentalInfo* finfo;
565
566 pnode = lookup_type_node_I (parent_type);
567 if (!pnode)
568 {
569 g_warning ("cannot derive type `%s' from invalid parent type `%s'",
570 type_name,
571 type_descriptive_name_I (parent_type));
572 return FALSE;
573 }
574 finfo = type_node_fundamental_info_I (pnode);
575 /* ensure flat derivability */
576 if (!(finfo->type_flags & G_TYPE_FLAG_DERIVABLE))
577 {
578 g_warning ("cannot derive `%s' from non-derivable parent type `%s'",
579 type_name,
580 NODE_NAME (pnode));
581 return FALSE;
582 }
583 /* ensure deep derivability */
584 if (parent_type != NODE_FUNDAMENTAL_TYPE (pnode) &&
585 !(finfo->type_flags & G_TYPE_FLAG_DEEP_DERIVABLE))
586 {
587 g_warning ("cannot derive `%s' from non-fundamental parent type `%s'",
588 type_name,
589 NODE_NAME (pnode));
590 return FALSE;
591 }
592
593 return TRUE;
594 }
595
596 static gboolean
597 check_collect_format_I (const gchar *collect_format)
598 {
599 const gchar *p = collect_format;
600 gchar valid_format[] = { G_VALUE_COLLECT_INT, G_VALUE_COLLECT_LONG,
601 G_VALUE_COLLECT_INT64, G_VALUE_COLLECT_DOUBLE,
602 G_VALUE_COLLECT_POINTER, 0 };
603
604 while (*p)
605 if (!strchr (valid_format, *p++))
606 return FALSE;
607 return p - collect_format <= G_VALUE_COLLECT_FORMAT_MAX_LENGTH;
608 }
609
610 static gboolean
611 check_value_table_I (const gchar *type_name,
612 const GTypeValueTable *value_table)
613 {
614 if (!value_table)
615 return FALSE;
616 else if (value_table->value_init == NULL)
617 {
618 if (value_table->value_free || value_table->value_copy ||
619 value_table->value_peek_pointer ||
620 value_table->collect_format || value_table->collect_value ||
621 value_table->lcopy_format || value_table->lcopy_value)
622 g_warning ("cannot handle uninitializable values of type `%s'",
623 type_name);
624 return FALSE;
625 }
626 else /* value_table->value_init != NULL */
627 {
628 if (!value_table->value_free)
629 {
630 /* +++ optional +++
631 * g_warning ("missing `value_free()' for type `%s'", type_name);
632 * return FALSE;
633 */
634 }
635 if (!value_table->value_copy)
636 {
637 g_warning ("missing `value_copy()' for type `%s'", type_name);
638 return FALSE;
639 }
640 if ((value_table->collect_format || value_table->collect_value) &&
641 (!value_table->collect_format || !value_table->collect_value))
642 {
643 g_warning ("one of `collect_format' and `collect_value()' is unspecified for type `%s'",
644 type_name);
645 return FALSE;
646 }
647 if (value_table->collect_format && !check_collect_format_I (value_table->collect_format))
648 {
649 g_warning ("the `%s' specification for type `%s' is too long or invalid",
650 "collect_format",
651 type_name);
652 return FALSE;
653 }
654 if ((value_table->lcopy_format || value_table->lcopy_value) &&
655 (!value_table->lcopy_format || !value_table->lcopy_value))
656 {
657 g_warning ("one of `lcopy_format' and `lcopy_value()' is unspecified for type `%s'",
658 type_name);
659 return FALSE;
660 }
661 if (value_table->lcopy_format && !check_collect_format_I (value_table->lcopy_format))
662 {
663 g_warning ("the `%s' specification for type `%s' is too long or invalid",
664 "lcopy_format",
665 type_name);
666 return FALSE;
667 }
668 }
669 return TRUE;
670 }
671
672 static gboolean
673 check_type_info_I (TypeNode *pnode,
674 GType ftype,
675 const gchar *type_name,
676 const GTypeInfo *info)
677 {
678 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (lookup_type_node_I (ftype));
679 gboolean is_interface = ftype == G_TYPE_INTERFACE;
680
681 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX && !(ftype & TYPE_ID_MASK));
682
683 /* check instance members */
684 if (!(finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
685 (info->instance_size || info->n_preallocs || info->instance_init))
686 {
687 if (pnode)
688 g_warning ("cannot instantiate `%s', derived from non-instantiatable parent type `%s'",
689 type_name,
690 NODE_NAME (pnode));
691 else
692 g_warning ("cannot instantiate `%s' as non-instantiatable fundamental",
693 type_name);
694 return FALSE;
695 }
696 /* check class & interface members */
697 if (!(finfo->type_flags & G_TYPE_FLAG_CLASSED) &&
698 (info->class_init || info->class_finalize || info->class_data ||
699 (!is_interface && (info->class_size || info->base_init || info->base_finalize))))
700 {
701 if (pnode)
702 g_warning ("cannot create class for `%s', derived from non-classed parent type `%s'",
703 type_name,
704 NODE_NAME (pnode));
705 else
706 g_warning ("cannot create class for `%s' as non-classed fundamental",
707 type_name);
708 return FALSE;
709 }
710 /* check interface size */
711 if (is_interface && info->class_size < sizeof (GTypeInterface))
712 {
713 g_warning ("specified interface size for type `%s' is smaller than `GTypeInterface' size",
714 type_name);
715 return FALSE;
716 }
717 /* check class size */
718 if (finfo->type_flags & G_TYPE_FLAG_CLASSED)
719 {
720 if (info->class_size < sizeof (GTypeClass))
721 {
722 g_warning ("specified class size for type `%s' is smaller than `GTypeClass' size",
723 type_name);
724 return FALSE;
725 }
726 if (pnode && info->class_size < pnode->data->class.class_size)
727 {
728 g_warning ("specified class size for type `%s' is smaller "
729 "than the parent type's `%s' class size",
730 type_name,
731 NODE_NAME (pnode));
732 return FALSE;
733 }
734 }
735 /* check instance size */
736 if (finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE)
737 {
738 if (info->instance_size < sizeof (GTypeInstance))
739 {
740 g_warning ("specified instance size for type `%s' is smaller than `GTypeInstance' size",
741 type_name);
742 return FALSE;
743 }
744 if (pnode && info->instance_size < pnode->data->instance.instance_size)
745 {
746 g_warning ("specified instance size for type `%s' is smaller "
747 "than the parent type's `%s' instance size",
748 type_name,
749 NODE_NAME (pnode));
750 return FALSE;
751 }
752 }
753
754 return TRUE;
755 }
756
757 static TypeNode*
758 find_conforming_child_type_L (TypeNode *pnode,
759 TypeNode *iface)
760 {
761 TypeNode *node = NULL;
762 guint i;
763
764 if (type_lookup_iface_entry_L (pnode, iface))
765 return pnode;
766
767 for (i = 0; i < pnode->n_children && !node; i++)
768 node = find_conforming_child_type_L (lookup_type_node_I (pnode->children[i]), iface);
769
770 return node;
771 }
772
773 static gboolean
774 check_add_interface_L (GType instance_type,
775 GType iface_type)
776 {
777 TypeNode *node = lookup_type_node_I (instance_type);
778 TypeNode *iface = lookup_type_node_I (iface_type);
779 IFaceEntry *entry;
780 TypeNode *tnode;
781 GType *prerequisites;
782 guint i;
783
784
785 if (!node || !node->is_instantiatable)
786 {
787 g_warning ("cannot add interfaces to invalid (non-instantiatable) type `%s'",
788 type_descriptive_name_I (instance_type));
789 return FALSE;
790 }
791 if (!iface || !NODE_IS_IFACE (iface))
792 {
793 g_warning ("cannot add invalid (non-interface) type `%s' to type `%s'",
794 type_descriptive_name_I (iface_type),
795 NODE_NAME (node));
796 return FALSE;
797 }
798 tnode = lookup_type_node_I (NODE_PARENT_TYPE (iface));
799 if (NODE_PARENT_TYPE (tnode) && !type_lookup_iface_entry_L (node, tnode))
800 {
801 /* 2001/7/31:timj: erk, i guess this warning is junk as interface derivation is flat */
802 g_warning ("cannot add sub-interface `%s' to type `%s' which does not conform to super-interface `%s'",
803 NODE_NAME (iface),
804 NODE_NAME (node),
805 NODE_NAME (tnode));
806 return FALSE;
807 }
808 /* allow overriding of interface type introduced for parent type */
809 entry = type_lookup_iface_entry_L (node, iface);
810 if (entry && entry->vtable == NULL && !type_iface_peek_holder_L (iface, NODE_TYPE (node)))
811 {
812 /* ok, we do conform to this interface already, but the interface vtable was not
813 * yet intialized, and we just conform to the interface because it got added to
814 * one of our parents. so we allow overriding of holder info here.
815 */
816 return TRUE;
817 }
818 /* check whether one of our children already conforms (or whether the interface
819 * got added to this node already)
820 */
821 tnode = find_conforming_child_type_L (node, iface); /* tnode is_a node */
822 if (tnode)
823 {
824 g_warning ("cannot add interface type `%s' to type `%s', since type `%s' already conforms to interface",
825 NODE_NAME (iface),
826 NODE_NAME (node),
827 NODE_NAME (tnode));
828 return FALSE;
829 }
830 prerequisites = IFACE_NODE_PREREQUISITES (iface);
831 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
832 {
833 tnode = lookup_type_node_I (prerequisites[i]);
834 if (!type_node_is_a_L (node, tnode))
835 {
836 g_warning ("cannot add interface type `%s' to type `%s' which does not conform to prerequisite `%s'",
837 NODE_NAME (iface),
838 NODE_NAME (node),
839 NODE_NAME (tnode));
840 return FALSE;
841 }
842 }
843 return TRUE;
844 }
845
846 static gboolean
847 check_interface_info_I (TypeNode *iface,
848 GType instance_type,
849 const GInterfaceInfo *info)
850 {
851 if ((info->interface_finalize || info->interface_data) && !info->interface_init)
852 {
853 g_warning ("interface type `%s' for type `%s' comes without initializer",
854 NODE_NAME (iface),
855 type_descriptive_name_I (instance_type));
856 return FALSE;
857 }
858
859 return TRUE;
860 }
861
862 /* --- type info (type node data) --- */
863 static void
864 type_data_make_W (TypeNode *node,
865 const GTypeInfo *info,
866 const GTypeValueTable *value_table)
867 {
868 TypeData *data;
869 GTypeValueTable *vtable = NULL;
870 guint vtable_size = 0;
871
872 g_assert (node->data == NULL && info != NULL);
873
874 if (!value_table)
875 {
876 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
877
878 if (pnode)
879 vtable = pnode->data->common.value_table;
880 else
881 {
882 static const GTypeValueTable zero_vtable = { NULL, };
883
884 value_table = &zero_vtable;
885 }
886 }
887 if (value_table)
888 {
889 /* need to setup vtable_size since we have to allocate it with data in one chunk */
890 vtable_size = sizeof (GTypeValueTable);
891 if (value_table->collect_format)
892 vtable_size += strlen (value_table->collect_format);
893 if (value_table->lcopy_format)
894 vtable_size += strlen (value_table->lcopy_format);
895 vtable_size += 2;
896 }
897
898 if (node->is_instantiatable) /* carefull, is_instantiatable is also is_classed */
899 {
900 data = g_malloc0 (sizeof (InstanceData) + vtable_size);
901 if (vtable_size)
902 vtable = G_STRUCT_MEMBER_P (data, sizeof (InstanceData));
903 data->instance.class_size = info->class_size;
904 data->instance.class_init_base = info->base_init;
905 data->instance.class_finalize_base = info->base_finalize;
906 data->instance.class_init = info->class_init;
907 data->instance.class_finalize = info->class_finalize;
908 data->instance.class_data = info->class_data;
909 data->instance.class = NULL;
910 data->instance.instance_size = info->instance_size;
911 #ifdef DISABLE_MEM_POOLS
912 data->instance.n_preallocs = 0;
913 #else /* !DISABLE_MEM_POOLS */
914 data->instance.n_preallocs = MIN (info->n_preallocs, 1024);
915 #endif /* !DISABLE_MEM_POOLS */
916 data->instance.instance_init = info->instance_init;
917 data->instance.mem_chunk = NULL;
918 }
919 else if (node->is_classed) /* only classed */
920 {
921 data = g_malloc0 (sizeof (ClassData) + vtable_size);
922 if (vtable_size)
923 vtable = G_STRUCT_MEMBER_P (data, sizeof (ClassData));
924 data->class.class_size = info->class_size;
925 data->class.class_init_base = info->base_init;
926 data->class.class_finalize_base = info->base_finalize;
927 data->class.class_init = info->class_init;
928 data->class.class_finalize = info->class_finalize;
929 data->class.class_data = info->class_data;
930 data->class.class = NULL;
931 }
932 else if (NODE_IS_IFACE (node))
933 {
934 data = g_malloc0 (sizeof (IFaceData) + vtable_size);
935 if (vtable_size)
936 vtable = G_STRUCT_MEMBER_P (data, sizeof (IFaceData));
937 data->iface.vtable_size = info->class_size;
938 data->iface.vtable_init_base = info->base_init;
939 data->iface.vtable_finalize_base = info->base_finalize;
940 }
941 else
942 {
943 data = g_malloc0 (sizeof (CommonData) + vtable_size);
944 if (vtable_size)
945 vtable = G_STRUCT_MEMBER_P (data, sizeof (CommonData));
946 }
947
948 node->data = data;
949 node->data->common.ref_count = 1;
950
951 if (vtable_size)
952 {
953 gchar *p;
954
955 /* we allocate the vtable and its strings together with the type data, so
956 * children can take over their parent's vtable pointer, and we don't
957 * need to worry freeing it or not when the child data is destroyed
958 */
959 *vtable = *value_table;
960 p = G_STRUCT_MEMBER_P (vtable, sizeof (*vtable));
961 p[0] = 0;
962 vtable->collect_format = p;
963 if (value_table->collect_format)
964 {
965 strcat (p, value_table->collect_format);
966 p += strlen (value_table->collect_format);
967 }
968 p++;
969 p[0] = 0;
970 vtable->lcopy_format = p;
971 if (value_table->lcopy_format)
972 strcat (p, value_table->lcopy_format);
973 }
974 node->data->common.value_table = vtable;
975 node->mutatable_check_cache = (node->data->common.value_table->value_init != NULL &&
976 !((G_TYPE_FLAG_VALUE_ABSTRACT | G_TYPE_FLAG_ABSTRACT) &
977 GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))));
978
979 g_assert (node->data->common.value_table != NULL); /* paranoid */
980 }
981
982 static inline void
983 type_data_ref_Wm (TypeNode *node)
984 {
985 if (!node->data)
986 {
987 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
988 GTypeInfo tmp_info;
989 GTypeValueTable tmp_value_table;
990
991 g_assert (node->plugin != NULL);
992
993 if (pnode)
994 {
995 type_data_ref_Wm (pnode);
996 if (node->data)
997 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
998 }
999
1000 memset (&tmp_info, 0, sizeof (tmp_info));
1001 memset (&tmp_value_table, 0, sizeof (tmp_value_table));
1002
1003 G_WRITE_UNLOCK (&type_rw_lock);
1004 g_type_plugin_use (node->plugin);
1005 g_type_plugin_complete_type_info (node->plugin, NODE_TYPE (node), &tmp_info, &tmp_value_table);
1006 G_WRITE_LOCK (&type_rw_lock);
1007 if (node->data)
1008 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
1009
1010 check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (node), NODE_NAME (node), &tmp_info);
1011 type_data_make_W (node, &tmp_info,
1012 check_value_table_I (NODE_NAME (node),
1013 &tmp_value_table) ? &tmp_value_table : NULL);
1014 }
1015 else
1016 {
1017 g_assert (node->data->common.ref_count > 0);
1018
1019 node->data->common.ref_count += 1;
1020 }
1021 }
1022
1023 static inline void
1024 type_data_unref_Wm (TypeNode *node,
1025 gboolean uncached)
1026 {
1027 g_assert (node->data && node->data->common.ref_count);
1028
1029 if (node->data->common.ref_count > 1)
1030 node->data->common.ref_count -= 1;
1031 else
1032 {
1033 if (!node->plugin)
1034 {
1035 g_warning ("static type `%s' unreferenced too often",
1036 NODE_NAME (node));
1037 return;
1038 }
1039
1040 type_data_last_unref_Wm (NODE_TYPE (node), uncached);
1041 }
1042 }
1043
1044 static void
1045 type_node_add_iface_entry_W (TypeNode *node,
1046 GType iface_type)
1047 {
1048 IFaceEntry *entries;
1049 guint i;
1050
1051 g_assert (node->is_instantiatable && CLASSED_NODE_N_IFACES (node) < MAX_N_IFACES);
1052
1053 entries = CLASSED_NODE_IFACES_ENTRIES (node);
1054 for (i = 0; i < CLASSED_NODE_N_IFACES (node); i++)
1055 if (entries[i].iface_type == iface_type)
1056 {
1057 /* this can (should) only happen if our parent type already conformed
1058 * to iface_type and node got it's own holder info. here, our
1059 * children should already have entries with NULL vtables, so
1060 * we're actually done.
1061 */
1062 g_assert (entries[i].vtable == NULL);
1063 return;
1064 }
1065 else if (entries[i].iface_type > iface_type)
1066 break;
1067 CLASSED_NODE_N_IFACES (node) += 1;
1068 CLASSED_NODE_IFACES_ENTRIES (node) = g_renew (IFaceEntry,
1069 CLASSED_NODE_IFACES_ENTRIES (node),
1070 CLASSED_NODE_N_IFACES (node));
1071 entries = CLASSED_NODE_IFACES_ENTRIES (node);
1072 g_memmove (entries + i + 1, entries + i, sizeof (entries[0]) * (CLASSED_NODE_N_IFACES (node) - i - 1));
1073 entries[i].iface_type = iface_type;
1074 entries[i].vtable = NULL;
1075
1076 for (i = 0; i < node->n_children; i++)
1077 type_node_add_iface_entry_W (lookup_type_node_I (node->children[i]), iface_type);
1078 }
1079
1080 static void
1081 type_add_interface_W (TypeNode *node,
1082 TypeNode *iface,
1083 const GInterfaceInfo *info,
1084 GTypePlugin *plugin)
1085 {
1086 IFaceHolder *iholder = g_new0 (IFaceHolder, 1);
1087
1088 /* we must not call any functions of GInterfaceInfo from within here, since
1089 * we got most probably called from _within_ a type registration function
1090 */
1091 g_assert (node->is_instantiatable && NODE_IS_IFACE (iface) && ((info && !plugin) || (!info && plugin)));
1092
1093 iholder->next = iface_node_get_holders_L (iface);
1094 iface_node_set_holders_W (iface, iholder);
1095 iholder->instance_type = NODE_TYPE (node);
1096 iholder->info = info ? g_memdup (info, sizeof (*info)) : NULL;
1097 iholder->plugin = plugin;
1098
1099 type_node_add_iface_entry_W (node, NODE_TYPE (iface));
1100 }
1101
1102 static void
1103 type_iface_add_prerequisite_W (TypeNode *iface,
1104 TypeNode *prerequisite_node)
1105 {
1106 GType prerequisite_type = NODE_TYPE (prerequisite_node);
1107 GType *prerequisites, *dependants;
1108 guint n_dependants, i;
1109
1110 g_assert (NODE_IS_IFACE (iface) &&
1111 IFACE_NODE_N_PREREQUISITES (iface) < MAX_N_PREREQUISITES &&
1112 (prerequisite_node->is_instantiatable || NODE_IS_IFACE (prerequisite_node)));
1113
1114 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1115 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1116 if (prerequisites[i] == prerequisite_type)
1117 return; /* we already have that prerequisiste */
1118 else if (prerequisites[i] > prerequisite_type)
1119 break;
1120 IFACE_NODE_N_PREREQUISITES (iface) += 1;
1121 IFACE_NODE_PREREQUISITES (iface) = g_renew (GType,
1122 IFACE_NODE_PREREQUISITES (iface),
1123 IFACE_NODE_N_PREREQUISITES (iface));
1124 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1125 g_memmove (prerequisites + i + 1, prerequisites + i,
1126 sizeof (prerequisites[0]) * (IFACE_NODE_N_PREREQUISITES (iface) - i - 1));
1127 prerequisites[i] = prerequisite_type;
1128
1129 /* we want to get notified when prerequisites get added to prerequisite_node */
1130 if (NODE_IS_IFACE (prerequisite_node))
1131 {
1132 dependants = iface_node_get_dependants_array_L (prerequisite_node);
1133 n_dependants = dependants ? dependants[0] : 0;
1134 n_dependants += 1;
1135 dependants = g_renew (GType, dependants, n_dependants + 1);
1136 dependants[n_dependants] = NODE_TYPE (iface);
1137 dependants[0] = n_dependants;
1138 iface_node_set_dependants_array_W (prerequisite_node, dependants);
1139 }
1140
1141 /* we need to notify all dependants */
1142 dependants = iface_node_get_dependants_array_L (iface);
1143 n_dependants = dependants ? dependants[0] : 0;
1144 for (i = 1; i <= n_dependants; i++)
1145 type_iface_add_prerequisite_W (lookup_type_node_I (dependants[i]), prerequisite_node);
1146 }
1147
1148 void
1149 g_type_interface_add_prerequisite (GType interface_type,
1150 GType prerequisite_type)
1151 {
1152 TypeNode *iface, *prerequisite_node;
1153 IFaceHolder *holders;
1154
1155 g_return_if_fail (G_TYPE_IS_INTERFACE (interface_type)); /* G_TYPE_IS_INTERFACE() is an external call: _U */
1156 g_return_if_fail (!g_type_is_a (interface_type, prerequisite_type));
1157 g_return_if_fail (!g_type_is_a (prerequisite_type, interface_type));
1158
1159 iface = lookup_type_node_I (interface_type);
1160 prerequisite_node = lookup_type_node_I (prerequisite_type);
1161 if (!iface || !prerequisite_node || !NODE_IS_IFACE (iface))
1162 {
1163 g_warning ("interface type `%s' or prerequisite type `%s' invalid",
1164 type_descriptive_name_I (interface_type),
1165 type_descriptive_name_I (prerequisite_type));
1166 return;
1167 }
1168 G_WRITE_LOCK (&type_rw_lock);
1169 holders = iface_node_get_holders_L (iface);
1170 if (holders)
1171 {
1172 G_WRITE_UNLOCK (&type_rw_lock);
1173 g_warning ("unable to add prerequisite `%s' to interface `%s' which is already in use for `%s'",
1174 type_descriptive_name_I (prerequisite_type),
1175 type_descriptive_name_I (interface_type),
1176 type_descriptive_name_I (holders->instance_type));
1177 return;
1178 }
1179 if (prerequisite_node->is_instantiatable)
1180 {
1181 guint i;
1182
1183 /* can have at most one publically installable instantiatable prerequisite */
1184 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1185 {
1186 TypeNode *prnode = lookup_type_node_I (IFACE_NODE_PREREQUISITES (iface)[i]);
1187
1188 if (prnode->is_instantiatable)
1189 {
1190 G_WRITE_UNLOCK (&type_rw_lock);
1191 g_warning ("adding prerequisite `%s' to interface `%s' conflicts with existing prerequisite `%s'",
1192 type_descriptive_name_I (prerequisite_type),
1193 type_descriptive_name_I (interface_type),
1194 type_descriptive_name_I (NODE_TYPE (prnode)));
1195 return;
1196 }
1197 }
1198
1199 for (i = 0; i < prerequisite_node->n_supers + 1; i++)
1200 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisite_node->supers[i]));
1201 G_WRITE_UNLOCK (&type_rw_lock);
1202 }
1203 else if (NODE_IS_IFACE (prerequisite_node))
1204 {
1205 GType *prerequisites;
1206 guint i;
1207
1208 prerequisites = IFACE_NODE_PREREQUISITES (prerequisite_node);
1209 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (prerequisite_node); i++)
1210 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisites[i]));
1211 type_iface_add_prerequisite_W (iface, prerequisite_node);
1212 G_WRITE_UNLOCK (&type_rw_lock);
1213 }
1214 else
1215 {
1216 G_WRITE_UNLOCK (&type_rw_lock);
1217 g_warning ("prerequisite `%s' for interface `%s' is neither instantiatable nor interface",
1218 type_descriptive_name_I (prerequisite_type),
1219 type_descriptive_name_I (interface_type));
1220 }
1221 }
1222
1223 /**
1224 * g_type_interface_prerequisites:
1225 * @interface_type: an interface type
1226 * @n_prerequisites: location to return the number of prerequisites, or %NULL
1227 *
1228 * Returns the prerequisites of an interfaces type.
1229 *
1230 * Return value: a newly-allocated zero-terminated array of #GType containing
1231 * the prerequisites of @interface_type
1232 **/
1233 GType* /* free result */
1234 g_type_interface_prerequisites (GType interface_type,
1235 guint *n_prerequisites)
1236 {
1237 TypeNode *iface;
1238
1239 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL);
1240
1241 iface = lookup_type_node_I (interface_type);
1242 if (iface)
1243 {
1244 GType *prerequisites;
1245 guint i;
1246
1247 G_READ_LOCK (&type_rw_lock);
1248 prerequisites = g_new (GType, IFACE_NODE_N_PREREQUISITES (iface) + 1);
1249 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1250 prerequisites[i] = IFACE_NODE_PREREQUISITES (iface)[i];
1251 prerequisites[i] = 0;
1252
1253 if (n_prerequisites)
1254 *n_prerequisites = IFACE_NODE_N_PREREQUISITES (iface);
1255 G_READ_UNLOCK (&type_rw_lock);
1256
1257 return prerequisites;
1258 }
1259 else
1260 {
1261 if (n_prerequisites)
1262 *n_prerequisites = 0;
1263
1264 return NULL;
1265 }
1266 }
1267
1268
1269 static IFaceHolder*
1270 type_iface_peek_holder_L (TypeNode *iface,
1271 GType instance_type)
1272 {
1273 IFaceHolder *iholder;
1274
1275 g_assert (NODE_IS_IFACE (iface));
1276
1277 iholder = iface_node_get_holders_L (iface);
1278 while (iholder && iholder->instance_type != instance_type)
1279 iholder = iholder->next;
1280 return iholder;
1281 }
1282
1283 static IFaceHolder*
1284 type_iface_retrieve_holder_info_Wm (TypeNode *iface,
1285 GType instance_type,
1286 gboolean need_info)
1287 {
1288 IFaceHolder *iholder = type_iface_peek_holder_L (iface, instance_type);
1289
1290 if (iholder && !iholder->info && need_info)
1291 {
1292 GInterfaceInfo tmp_info;
1293
1294 g_assert (iholder->plugin != NULL);
1295
1296 type_data_ref_Wm (iface);
1297 if (iholder->info)
1298 INVALID_RECURSION ("g_type_plugin_*", iface->plugin, NODE_NAME (iface));
1299
1300 memset (&tmp_info, 0, sizeof (tmp_info));
1301
1302 G_WRITE_UNLOCK (&type_rw_lock);
1303 g_type_plugin_use (iholder->plugin);
1304 g_type_plugin_complete_interface_info (iholder->plugin, instance_type, NODE_TYPE (iface), &tmp_info);
1305 G_WRITE_LOCK (&type_rw_lock);
1306 if (iholder->info)
1307 INVALID_RECURSION ("g_type_plugin_*", iholder->plugin, NODE_NAME (iface));
1308
1309 check_interface_info_I (iface, instance_type, &tmp_info);
1310 iholder->info = g_memdup (&tmp_info, sizeof (tmp_info));
1311 }
1312
1313 return iholder; /* we don't modify write lock upon returning NULL */
1314 }
1315
1316 static void
1317 type_iface_blow_holder_info_Wm (TypeNode *iface,
1318 GType instance_type)
1319 {
1320 IFaceHolder *iholder = iface_node_get_holders_L (iface);
1321
1322 g_assert (NODE_IS_IFACE (iface));
1323
1324 while (iholder->instance_type != instance_type)
1325 iholder = iholder->next;
1326
1327 if (iholder->info && iholder->plugin)
1328 {
1329 g_free (iholder->info);
1330 iholder->info = NULL;
1331
1332 G_WRITE_UNLOCK (&type_rw_lock);
1333 g_type_plugin_unuse (iholder->plugin);
1334 G_WRITE_LOCK (&type_rw_lock);
1335
1336 type_data_unref_Wm (iface, FALSE);
1337 }
1338 }
1339
1340
1341 /* --- type structure creation/destruction --- */
1342 GTypeInstance*
1343 g_type_create_instance (GType type)
1344 {
1345 TypeNode *node;
1346 GTypeInstance *instance;
1347 GTypeClass *class;
1348 guint i;
1349
1350 node = lookup_type_node_I (type);
1351 if (!node || !node->is_instantiatable)
1352 {
1353 g_warning ("cannot create new instance of invalid (non-instantiatable) type `%s'",
1354 type_descriptive_name_I (type));
1355 return NULL;
1356 }
1357 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1358 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (type))
1359 {
1360 g_warning ("cannot create instance of abstract (non-instantiatable) type `%s'",
1361 type_descriptive_name_I (type));
1362 return NULL;
1363 }
1364
1365 class = g_type_class_ref (type);
1366
1367 if (node->data->instance.n_preallocs)
1368 {
1369 G_WRITE_LOCK (&type_rw_lock);
1370 if (!node->data->instance.mem_chunk)
1371 node->data->instance.mem_chunk = g_mem_chunk_new (NODE_NAME (node),
1372 node->data->instance.instance_size,
1373 (node->data->instance.instance_size *
1374 node->data->instance.n_preallocs),
1375 G_ALLOC_AND_FREE);
1376 instance = g_chunk_new0 (GTypeInstance, node->data->instance.mem_chunk);
1377 G_WRITE_UNLOCK (&type_rw_lock);
1378 }
1379 else
1380 instance = g_malloc0 (node->data->instance.instance_size); /* fine without read lock */
1381 for (i = node->n_supers; i > 0; i--)
1382 {
1383 TypeNode *pnode;
1384
1385 pnode = lookup_type_node_I (node->supers[i]);
1386 if (pnode->data->instance.instance_init)
1387 {
1388 instance->g_class = pnode->data->instance.class;
1389 pnode->data->instance.instance_init (instance, class);
1390 }
1391 }
1392 instance->g_class = class;
1393
1394 if (node->data->instance.instance_init)
1395 node->data->instance.instance_init (instance, class);
1396
1397 return instance;
1398 }
1399
1400 void
1401 g_type_free_instance (GTypeInstance *instance)
1402 {
1403 TypeNode *node;
1404 GTypeClass *class;
1405
1406 g_return_if_fail (instance != NULL && instance->g_class != NULL);
1407
1408 class = instance->g_class;
1409 node = lookup_type_node_I (class->g_type);
1410 if (!node || !node->is_instantiatable || !node->data || node->data->class.class != (gpointer) class)
1411 {
1412 g_warning ("cannot free instance of invalid (non-instantiatable) type `%s'",
1413 type_descriptive_name_I (class->g_type));
1414 return;
1415 }
1416 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1417 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (NODE_TYPE (node)))
1418 {
1419 g_warning ("cannot free instance of abstract (non-instantiatable) type `%s'",
1420 NODE_NAME (node));
1421 return;
1422 }
1423
1424 instance->g_class = NULL;
1425 #ifdef G_ENABLE_DEBUG
1426 memset (instance, 0xaa, node->data->instance.instance_size); /* debugging hack */
1427 #endif
1428 if (node->data->instance.n_preallocs)
1429 {
1430 G_WRITE_LOCK (&type_rw_lock);
1431 g_chunk_free (instance, node->data->instance.mem_chunk);
1432 G_WRITE_UNLOCK (&type_rw_lock);
1433 }
1434 else
1435 g_free (instance);
1436
1437 g_type_class_unref (class);
1438 }
1439
1440 static gboolean
1441 type_iface_vtable_init_Wm (TypeNode *iface,
1442 TypeNode *node)
1443 {
1444 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
1445 IFaceHolder *iholder;
1446 GTypeInterface *vtable = NULL;
1447 TypeNode *pnode;
1448
1449 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
1450 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), TRUE);
1451 if (!iholder)
1452 return FALSE; /* we don't modify write lock upon FALSE */
1453
1454 g_assert (iface->data && entry && entry->vtable == NULL && iholder && iholder->info);
1455
1456 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1457 if (pnode) /* want to copy over parent iface contents */
1458 {
1459 IFaceEntry *pentry = type_lookup_iface_entry_L (pnode, iface);
1460
1461 if (pentry)
1462 vtable = g_memdup (pentry->vtable, iface->data->iface.vtable_size);
1463 }
1464 if (!vtable)
1465 vtable = g_malloc0 (iface->data->iface.vtable_size);
1466 entry->vtable = vtable;
1467 vtable->g_type = NODE_TYPE (iface);
1468 vtable->g_instance_type = NODE_TYPE (node);
1469
1470 if (iface->data->iface.vtable_init_base || iholder->info->interface_init)
1471 {
1472 G_WRITE_UNLOCK (&type_rw_lock);
1473 if (iface->data->iface.vtable_init_base)
1474 iface->data->iface.vtable_init_base (vtable);
1475 if (iholder->info->interface_init)
1476 iholder->info->interface_init (vtable, iholder->info->interface_data);
1477 G_WRITE_LOCK (&type_rw_lock);
1478 }
1479 return TRUE; /* write lock modified */
1480 }
1481
1482 static gboolean
1483 type_iface_vtable_finalize_Wm (TypeNode *iface,
1484 TypeNode *node,
1485 GTypeInterface *vtable)
1486 {
1487 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
1488 IFaceHolder *iholder;
1489
1490 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
1491 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), FALSE);
1492 if (!iholder)
1493 return FALSE; /* we don't modify write lock upon FALSE */
1494
1495 g_assert (entry && entry->vtable == vtable && iholder->info);
1496
1497 entry->vtable = NULL;
1498 if (iholder->info->interface_finalize || iface->data->iface.vtable_finalize_base)
1499 {
1500 G_WRITE_UNLOCK (&type_rw_lock);
1501 if (iholder->info->interface_finalize)
1502 iholder->info->interface_finalize (vtable, iholder->info->interface_data);
1503 if (iface->data->iface.vtable_finalize_base)
1504 iface->data->iface.vtable_finalize_base (vtable);
1505 G_WRITE_LOCK (&type_rw_lock);
1506 }
1507 vtable->g_type = 0;
1508 vtable->g_instance_type = 0;
1509 g_free (vtable);
1510
1511 type_iface_blow_holder_info_Wm (iface, NODE_TYPE (node));
1512
1513 return TRUE; /* write lock modified */
1514 }
1515
1516 static void
1517 type_class_init_Wm (TypeNode *node,
1518 GTypeClass *pclass)
1519 {
1520 GSList *slist, *init_slist = NULL;
1521 GTypeClass *class;
1522 IFaceEntry *entry;
1523 TypeNode *bnode, *pnode;
1524 guint i;
1525
1526 g_assert (node->is_classed && node->data &&
1527 node->data->class.class_size &&
1528 !node->data->class.class);
1529
1530 class = g_malloc0 (node->data->class.class_size);
1531 node->data->class.class = class;
1532
1533 if (pclass)
1534 {
1535 TypeNode *pnode = lookup_type_node_I (pclass->g_type);
1536
1537 memcpy (class, pclass, pnode->data->class.class_size);
1538 }
1539 class->g_type = NODE_TYPE (node);
1540
1541 G_WRITE_UNLOCK (&type_rw_lock);
1542
1543 /* stack all base class initialization functions, so we
1544 * call them in ascending order.
1545 */
1546 for (bnode = node; bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
1547 if (bnode->data->class.class_init_base)
1548 init_slist = g_slist_prepend (init_slist, (gpointer) bnode->data->class.class_init_base);
1549 for (slist = init_slist; slist; slist = slist->next)
1550 {
1551 GBaseInitFunc class_init_base = (GBaseInitFunc) slist->data;
1552
1553 class_init_base (class);
1554 }
1555 g_slist_free (init_slist);
1556
1557 if (node->data->class.class_init)
1558 node->data->class.class_init (class, (gpointer) node->data->class.class_data);
1559
1560 G_WRITE_LOCK (&type_rw_lock);
1561
1562 /* ok, we got the class done, now initialize all interfaces, either
1563 * from parent, or through our holder info
1564 */
1565 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1566 entry = CLASSED_NODE_IFACES_ENTRIES (node) + 0;
1567 while (entry)
1568 {
1569 g_assert (entry->vtable == NULL);
1570
1571 if (!type_iface_vtable_init_Wm (lookup_type_node_I (entry->iface_type), node))
1572 {
1573 guint j;
1574
1575 /* type_iface_vtable_init_Wm() doesn't modify write lock upon FALSE,
1576 * need to get this interface from parent
1577 */
1578 g_assert (pnode != NULL);
1579
1580 for (j = 0; j < CLASSED_NODE_N_IFACES (pnode); j++)
1581 {
1582 IFaceEntry *pentry = CLASSED_NODE_IFACES_ENTRIES (pnode) + j;
1583
1584 if (pentry->iface_type == entry->iface_type)
1585 {
1586 entry->vtable = pentry->vtable;
1587 break;
1588 }
1589 }
1590 g_assert (entry->vtable != NULL);
1591 }
1592
1593 /* refetch entry, IFACES_ENTRIES might be modified */
1594 for (entry = NULL, i = 0; i < CLASSED_NODE_N_IFACES (node); i++)
1595 if (!CLASSED_NODE_IFACES_ENTRIES (node)[i].vtable)
1596 entry = CLASSED_NODE_IFACES_ENTRIES (node) + i;
1597 }
1598 }
1599
1600 static void
1601 type_data_finalize_class_ifaces_Wm (TypeNode *node)
1602 {
1603 IFaceEntry *entry;
1604 guint i;
1605
1606 g_assert (node->is_instantiatable && node->data && node->data->class.class && node->data->common.ref_count == 0);
1607
1608 g_message ("finalizing interfaces for %sClass `%s'",
1609 type_descriptive_name_I (NODE_FUNDAMENTAL_TYPE (node)),
1610 type_descriptive_name_I (NODE_TYPE (node)));
1611
1612 for (entry = NULL, i = 0; i < CLASSED_NODE_N_IFACES (node); i++)
1613 if (CLASSED_NODE_IFACES_ENTRIES (node)[i].vtable &&
1614 CLASSED_NODE_IFACES_ENTRIES (node)[i].vtable->g_instance_type == NODE_TYPE (node))
1615 entry = CLASSED_NODE_IFACES_ENTRIES (node) + i;
1616 while (entry)
1617 {
1618 if (!type_iface_vtable_finalize_Wm (lookup_type_node_I (entry->iface_type), node, entry->vtable))
1619 {
1620 /* type_iface_vtable_finalize_Wm() doesn't modify write lock upon FALSE,
1621 * iface vtable came from parent
1622 */
1623 entry->vtable = NULL;
1624 }
1625
1626 /* refetch entry, IFACES_ENTRIES might be modified */
1627 for (entry = NULL, i = 0; i < CLASSED_NODE_N_IFACES (node); i++)
1628 if (CLASSED_NODE_IFACES_ENTRIES (node)[i].vtable &&
1629 CLASSED_NODE_IFACES_ENTRIES (node)[i].vtable->g_instance_type == NODE_TYPE (node))
1630 entry = CLASSED_NODE_IFACES_ENTRIES (node) + i;
1631 }
1632 }
1633
1634 static void
1635 type_data_finalize_class_U (TypeNode *node,
1636 ClassData *cdata)
1637 {
1638 GTypeClass *class = cdata->class;
1639 TypeNode *bnode;
1640
1641 g_assert (cdata->class && cdata->common.ref_count == 0);
1642
1643 if (cdata->class_finalize)
1644 cdata->class_finalize (class, (gpointer) cdata->class_data);
1645
1646 /* call all base class destruction functions in descending order
1647 */
1648 if (cdata->class_finalize_base)
1649 cdata->class_finalize_base (class);
1650 for (bnode = lookup_type_node_I (NODE_PARENT_TYPE (node)); bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
1651 if (bnode->data->class.class_finalize_base)
1652 bnode->data->class.class_finalize_base (class);
1653
1654 class->g_type = 0;
1655 g_free (cdata->class);
1656 }
1657
1658 static void
1659 type_data_last_unref_Wm (GType type,
1660 gboolean uncached)
1661 {
1662 TypeNode *node = lookup_type_node_I (type);
1663
1664 g_return_if_fail (node != NULL && node->plugin != NULL);
1665
1666 if (!node->data || node->data->common.ref_count == 0)
1667 {
1668 g_warning ("cannot drop last reference to unreferenced type `%s'",
1669 type_descriptive_name_I (type));
1670 return;
1671 }
1672
1673 if (node->is_classed && node->data && node->data->class.class && static_n_class_cache_funcs)
1674 {
1675 guint i;
1676
1677 G_WRITE_UNLOCK (&type_rw_lock);
1678 G_READ_LOCK (&type_rw_lock);
1679 for (i = 0; i < static_n_class_cache_funcs; i++)
1680 {
1681 GTypeClassCacheFunc cache_func = static_class_cache_funcs[i].cache_func;
1682 gpointer cache_data = static_class_cache_funcs[i].cache_data;
1683 gboolean need_break;
1684
1685 G_READ_UNLOCK (&type_rw_lock);
1686 need_break = cache_func (cache_data, node->data->class.class);
1687 G_READ_LOCK (&type_rw_lock);
1688 if (!node->data || node->data->common.ref_count == 0)
1689 INVALID_RECURSION ("GType class cache function ", cache_func, NODE_NAME (node));
1690 if (need_break)
1691 break;
1692 }
1693 G_READ_UNLOCK (&type_rw_lock);
1694 G_WRITE_LOCK (&type_rw_lock);
1695 }
1696
1697 if (node->data->common.ref_count > 1) /* may have been re-referenced meanwhile */
1698 node->data->common.ref_count -= 1;
1699 else
1700 {
1701 GType ptype = NODE_PARENT_TYPE (node);
1702 TypeData *tdata;
1703
1704 node->data->common.ref_count = 0;
1705
1706 if (node->is_instantiatable && node->data->instance.mem_chunk)
1707 {
1708 g_mem_chunk_destroy (node->data->instance.mem_chunk);
1709 node->data->instance.mem_chunk = NULL;
1710 }
1711
1712 tdata = node->data;
1713 if (node->is_classed && tdata->class.class)
1714 {
1715 if (CLASSED_NODE_N_IFACES (node))
1716 type_data_finalize_class_ifaces_Wm (node);
1717 node->mutatable_check_cache = FALSE;
1718 node->data = NULL;
1719 G_WRITE_UNLOCK (&type_rw_lock);
1720 type_data_finalize_class_U (node, &tdata->class);
1721 G_WRITE_LOCK (&type_rw_lock);
1722 }
1723 else
1724 {
1725 node->mutatable_check_cache = FALSE;
1726 node->data = NULL;
1727 }
1728
1729 /* freeing tdata->common.value_table and its contents is taking care of
1730 * by allocating it in one chunk with tdata
1731 */
1732 g_free (tdata);
1733
1734 if (ptype)
1735 type_data_unref_Wm (lookup_type_node_I (ptype), FALSE);
1736 G_WRITE_UNLOCK (&type_rw_lock);
1737 g_type_plugin_unuse (node->plugin);
1738 G_WRITE_LOCK (&type_rw_lock);
1739 }
1740 }
1741
1742 void
1743 g_type_add_class_cache_func (gpointer cache_data,
1744 GTypeClassCacheFunc cache_func)
1745 {
1746 guint i;
1747
1748 g_return_if_fail (cache_func != NULL);
1749
1750 G_WRITE_LOCK (&type_rw_lock);
1751 i = static_n_class_cache_funcs++;
1752 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
1753 static_class_cache_funcs[i].cache_data = cache_data;
1754 static_class_cache_funcs[i].cache_func = cache_func;
1755 G_WRITE_UNLOCK (&type_rw_lock);
1756 }
1757
1758 void
1759 g_type_remove_class_cache_func (gpointer cache_data,
1760 GTypeClassCacheFunc cache_func)
1761 {
1762 gboolean found_it = FALSE;
1763 guint i;
1764
1765 g_return_if_fail (cache_func != NULL);
1766
1767 G_WRITE_LOCK (&type_rw_lock);
1768 for (i = 0; i < static_n_class_cache_funcs; i++)
1769 if (static_class_cache_funcs[i].cache_data == cache_data &&
1770 static_class_cache_funcs[i].cache_func == cache_func)
1771 {
1772 static_n_class_cache_funcs--;
1773 g_memmove (static_class_cache_funcs + i,
1774 static_class_cache_funcs + i + 1,
1775 sizeof (static_class_cache_funcs[0]) * (static_n_class_cache_funcs - i));
1776 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
1777 found_it = TRUE;
1778 break;
1779 }
1780 G_WRITE_UNLOCK (&type_rw_lock);
1781
1782 if (!found_it)
1783 g_warning (G_STRLOC ": cannot remove unregistered class cache func %p with data %p",
1784 cache_func, cache_data);
1785 }
1786
1787
1788 /* --- type registration --- */
1789 GType
1790 g_type_register_fundamental (GType type_id,
1791 const gchar *type_name,
1792 const GTypeInfo *info,
1793 const GTypeFundamentalInfo *finfo,
1794 GTypeFlags flags)
1795 {
1796 GTypeFundamentalInfo *node_finfo;
1797 TypeNode *node;
1798
1799 g_return_val_if_uninitialized (static_quark_type_flags, g_type_init, 0);
1800 g_return_val_if_fail (type_id > 0, 0);
1801 g_return_val_if_fail (type_name != NULL, 0);
1802 g_return_val_if_fail (info != NULL, 0);
1803 g_return_val_if_fail (finfo != NULL, 0);
1804
1805 if (!check_type_name_I (type_name))
1806 return 0;
1807 if ((type_id & TYPE_ID_MASK) ||
1808 type_id > G_TYPE_FUNDAMENTAL_MAX)
1809 {
1810 g_warning ("attempt to register fundamental type `%s' with invalid type id (%lu)",
1811 type_name,
1812 type_id);
1813 return 0;
1814 }
1815 if ((finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
1816 !(finfo->type_flags & G_TYPE_FLAG_CLASSED))
1817 {
1818 g_warning ("cannot register instantiatable fundamental type `%s' as non-classed",
1819 type_name);
1820 return 0;
1821 }
1822 if (lookup_type_node_I (type_id))
1823 {
1824 g_warning ("cannot register existing fundamental type `%s' (as `%s')",
1825 type_descriptive_name_I (type_id),
1826 type_name);
1827 return 0;
1828 }
1829
1830 G_WRITE_LOCK (&type_rw_lock);
1831 node = type_node_fundamental_new_W (type_id, type_name, finfo->type_flags);
1832 node_finfo = type_node_fundamental_info_I (node);
1833 type_add_flags_W (node, flags);
1834
1835 if (check_type_info_I (NULL, NODE_FUNDAMENTAL_TYPE (node), type_name, info))
1836 type_data_make_W (node, info,
1837 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
1838 G_WRITE_UNLOCK (&type_rw_lock);
1839
1840 return NODE_TYPE (node);
1841 }
1842
1843 GType
1844 g_type_register_static (GType parent_type,
1845 const gchar *type_name,
1846 const GTypeInfo *info,
1847 GTypeFlags flags)
1848 {
1849 TypeNode *pnode, *node;
1850 GType type = 0;
1851
1852 g_return_val_if_uninitialized (static_quark_type_flags, g_type_init, 0);
1853 g_return_val_if_fail (parent_type > 0, 0);
1854 g_return_val_if_fail (type_name != NULL, 0);
1855 g_return_val_if_fail (info != NULL, 0);
1856
1857 if (!check_type_name_I (type_name) ||
1858 !check_derivation_I (parent_type, type_name))
1859 return 0;
1860 if (info->class_finalize)
1861 {
1862 g_warning ("class finalizer specified for static type `%s'",
1863 type_name);
1864 return 0;
1865 }
1866
1867 pnode = lookup_type_node_I (parent_type);
1868 G_WRITE_LOCK (&type_rw_lock);
1869 type_data_ref_Wm (pnode);
1870 if (check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (pnode), type_name, info))
1871 {
1872 node = type_node_new_W (pnode, type_name, NULL);
1873 type_add_flags_W (node, flags);
1874 type = NODE_TYPE (node);
1875 type_data_make_W (node, info,
1876 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
1877 }
1878 G_WRITE_UNLOCK (&type_rw_lock);
1879
1880 return type;
1881 }
1882
1883 GType
1884 g_type_register_dynamic (GType parent_type,
1885 const gchar *type_name,
1886 GTypePlugin *plugin,
1887 GTypeFlags flags)
1888 {
1889 TypeNode *pnode, *node;
1890 GType type;
1891
1892 g_return_val_if_uninitialized (static_quark_type_flags, g_type_init, 0);
1893 g_return_val_if_fail (parent_type > 0, 0);
1894 g_return_val_if_fail (type_name != NULL, 0);
1895 g_return_val_if_fail (plugin != NULL, 0);
1896
1897 if (!check_type_name_I (type_name) ||
1898 !check_derivation_I (parent_type, type_name) ||
1899 !check_plugin_U (plugin, TRUE, FALSE, type_name))
1900 return 0;
1901
1902 G_WRITE_LOCK (&type_rw_lock);
1903 pnode = lookup_type_node_I (parent_type);
1904 node = type_node_new_W (pnode, type_name, plugin);
1905 type_add_flags_W (node, flags);
1906 type = NODE_TYPE (node);
1907 G_WRITE_UNLOCK (&type_rw_lock);
1908
1909 return type;
1910 }
1911
1912 void
1913 g_type_add_interface_static (GType instance_type,
1914 GType interface_type,
1915 const GInterfaceInfo *info)
1916 {
1917 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
1918 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
1919 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
1920
1921 G_WRITE_LOCK (&type_rw_lock);
1922 if (check_add_interface_L (instance_type, interface_type))
1923 {
1924 TypeNode *node = lookup_type_node_I (instance_type);
1925 TypeNode *iface = lookup_type_node_I (interface_type);
1926
1927 if (check_interface_info_I (iface, NODE_TYPE (node), info))
1928 {
1929 type_add_interface_W (node, iface, info, NULL);
1930 /* if we have a class already, the interface vtable needs to
1931 * be initialized as well
1932 */
1933 if (node->data && node->data->class.class)
1934 type_iface_vtable_init_Wm (iface, node);
1935 }
1936 }
1937 G_WRITE_UNLOCK (&type_rw_lock);
1938 }
1939
1940 void
1941 g_type_add_interface_dynamic (GType instance_type,
1942 GType interface_type,
1943 GTypePlugin *plugin)
1944 {
1945 TypeNode *node;
1946
1947 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
1948 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
1949 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
1950
1951 node = lookup_type_node_I (instance_type);
1952 if (!check_plugin_U (plugin, FALSE, TRUE, NODE_NAME (node)))
1953 return;
1954
1955 G_WRITE_LOCK (&type_rw_lock);
1956 if (check_add_interface_L (instance_type, interface_type))
1957 {
1958 TypeNode *iface = lookup_type_node_I (interface_type);
1959
1960 type_add_interface_W (node, iface, NULL, plugin);
1961 /* if we have a class already, the interface vtable needs to
1962 * be initialized as well
1963 */
1964 if (node->data && node->data->class.class)
1965 type_iface_vtable_init_Wm (iface, node);
1966 }
1967 G_WRITE_UNLOCK (&type_rw_lock);
1968 }
1969
1970
1971 /* --- public API functions --- */
1972 gpointer
1973 g_type_class_ref (GType type)
1974 {
1975 TypeNode *node;
1976
1977 /* optimize for common code path
1978 */
1979 G_WRITE_LOCK (&type_rw_lock);
1980 node = lookup_type_node_I (type);
1981 if (node && node->is_classed && node->data &&
1982 node->data->class.class && node->data->common.ref_count > 0)
1983 {
1984 type_data_ref_Wm (node);
1985 G_WRITE_UNLOCK (&type_rw_lock);
1986
1987 return node->data->class.class;
1988 }
1989
1990 if (!node || !node->is_classed ||
1991 (node->data && node->data->common.ref_count < 1))
1992 {
1993 G_WRITE_UNLOCK (&type_rw_lock);
1994 g_warning ("cannot retrieve class for invalid (unclassed) type `%s'",
1995 type_descriptive_name_I (type));
1996 return NULL;
1997 }
1998
1999 type_data_ref_Wm (node);
2000
2001 if (!node->data->class.class)
2002 {
2003 GType ptype = NODE_PARENT_TYPE (node);
2004 GTypeClass *pclass = NULL;
2005
2006 if (ptype)
2007 {
2008 G_WRITE_UNLOCK (&type_rw_lock);
2009 pclass = g_type_class_ref (ptype);
2010 if (node->data->class.class)
2011 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
2012 G_WRITE_LOCK (&type_rw_lock);
2013 }
2014
2015 type_class_init_Wm (node, pclass);
2016 }
2017 G_WRITE_UNLOCK (&type_rw_lock);
2018
2019 return node->data->class.class;
2020 }
2021
2022 void
2023 g_type_class_unref (gpointer g_class)
2024 {
2025 TypeNode *node;
2026 GTypeClass *class = g_class;
2027
2028 g_return_if_fail (g_class != NULL);
2029
2030 node = lookup_type_node_I (class->g_type);
2031 G_WRITE_LOCK (&type_rw_lock);
2032 if (node && node->is_classed && node->data &&
2033 node->data->class.class == class && node->data->common.ref_count > 0)
2034 type_data_unref_Wm (node, FALSE);
2035 else
2036 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2037 type_descriptive_name_I (class->g_type));
2038 G_WRITE_UNLOCK (&type_rw_lock);
2039 }
2040
2041 void
2042 g_type_class_unref_uncached (gpointer g_class)
2043 {
2044 TypeNode *node;
2045 GTypeClass *class = g_class;
2046
2047 g_return_if_fail (g_class != NULL);
2048
2049 G_WRITE_LOCK (&type_rw_lock);
2050 node = lookup_type_node_I (class->g_type);
2051 if (node && node->is_classed && node->data &&
2052 node->data->class.class == class && node->data->common.ref_count > 0)
2053 type_data_unref_Wm (node, TRUE);
2054 else
2055 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2056 type_descriptive_name_I (class->g_type));
2057 G_WRITE_UNLOCK (&type_rw_lock);
2058 }
2059
2060 gpointer
2061 g_type_class_peek (GType type)
2062 {
2063 TypeNode *node;
2064 gpointer class;
2065
2066 node = lookup_type_node_I (type);
2067 G_READ_LOCK (&type_rw_lock);
2068 if (node && node->is_classed && node->data && node->data->class.class) /* common.ref_count _may_ be 0 */
2069 class = node->data->class.class;
2070 else
2071 class = NULL;
2072 G_READ_UNLOCK (&type_rw_lock);
2073
2074 return class;
2075 }
2076
2077 gpointer
2078 g_type_class_peek_parent (gpointer g_class)
2079 {
2080 TypeNode *node;
2081 gpointer class = NULL;
2082
2083 g_return_val_if_fail (g_class != NULL, NULL);
2084
2085 node = lookup_type_node_I (G_TYPE_FROM_CLASS (g_class));
2086 G_READ_LOCK (&type_rw_lock);
2087 if (node && node->is_classed && node->data && NODE_PARENT_TYPE (node))
2088 {
2089 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
2090 class = node->data->class.class;
2091 }
2092 else if (NODE_PARENT_TYPE (node))
2093 g_warning (G_STRLOC ": invalid class pointer `%p'", g_class);
2094 G_READ_UNLOCK (&type_rw_lock);
2095
2096 return class;
2097 }
2098
2099 gpointer
2100 g_type_interface_peek (gpointer instance_class,
2101 GType iface_type)
2102 {
2103 TypeNode *node;
2104 TypeNode *iface;
2105 gpointer vtable = NULL;
2106 GTypeClass *class = instance_class;
2107
2108 g_return_val_if_fail (instance_class != NULL, NULL);
2109
2110 node = lookup_type_node_I (class->g_type);
2111 iface = lookup_type_node_I (iface_type);
2112 if (node && node->is_instantiatable && iface)
2113 {
2114 IFaceEntry *entry;
2115
2116 G_READ_LOCK (&type_rw_lock);
2117
2118 entry = type_lookup_iface_entry_L (node, iface);
2119 if (entry && entry->vtable) /* entry is relocatable */
2120 vtable = entry->vtable;
2121
2122 G_READ_UNLOCK (&type_rw_lock);
2123 }
2124 else
2125 g_warning (G_STRLOC ": invalid class pointer `%p'", class);
2126
2127 return vtable;
2128 }
2129
2130 gpointer
2131 g_type_interface_peek_parent (gpointer g_iface)
2132 {
2133 TypeNode *node;
2134 TypeNode *iface;
2135 gpointer vtable = NULL;
2136 GTypeInterface *iface_class = g_iface;
2137
2138 g_return_val_if_fail (g_iface != NULL, NULL);
2139
2140 iface = lookup_type_node_I (iface_class->g_type);
2141 node = lookup_type_node_I (iface_class->g_instance_type);
2142 if (node)
2143 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
2144 if (node && node->is_instantiatable && iface)
2145 {
2146 IFaceEntry *entry;
2147
2148 G_READ_LOCK (&type_rw_lock);
2149
2150 entry = type_lookup_iface_entry_L (node, iface);
2151 if (entry && entry->vtable) /* entry is relocatable */
2152 vtable = entry->vtable;
2153
2154 G_READ_UNLOCK (&type_rw_lock);
2155 }
2156 else if (node)
2157 g_warning (G_STRLOC ": invalid interface pointer `%p'", g_iface);
2158
2159 return vtable;
2160 }
2161
2162 G_CONST_RETURN gchar*
2163 g_type_name (GType type)
2164 {
2165 TypeNode *node;
2166
2167 g_return_val_if_uninitialized (static_quark_type_flags, g_type_init, NULL);
2168
2169 node = lookup_type_node_I (type);
2170
2171 return node ? NODE_NAME (node) : NULL;
2172 }
2173
2174 GQuark
2175 g_type_qname (GType type)
2176 {
2177 TypeNode *node;
2178
2179 node = lookup_type_node_I (type);
2180
2181 return node ? node->qname : 0;
2182 }
2183
2184 GType
2185 g_type_from_name (const gchar *name)
2186 {
2187 GType type = 0;
2188 GQuark quark;
2189
2190 g_return_val_if_fail (name != NULL, 0);
2191
2192 quark = g_quark_try_string (name);
2193 if (quark)
2194 {
2195 G_READ_LOCK (&type_rw_lock);
2196 type = (GType) g_hash_table_lookup (static_type_nodes_ht, GUINT_TO_POINTER (quark));
2197 G_READ_UNLOCK (&type_rw_lock);
2198 }
2199
2200 return type;
2201 }
2202
2203 GType
2204 g_type_parent (GType type)
2205 {
2206 TypeNode *node;
2207
2208 node = lookup_type_node_I (type);
2209
2210 return node ? NODE_PARENT_TYPE (node) : 0;
2211 }
2212
2213 guint
2214 g_type_depth (GType type)
2215 {
2216 TypeNode *node;
2217
2218 node = lookup_type_node_I (type);
2219
2220 return node ? node->n_supers + 1 : 0;
2221 }
2222
2223 GType
2224 g_type_next_base (GType type,
2225 GType base_type)
2226 {
2227 GType atype = 0;
2228 TypeNode *node;
2229
2230 node = lookup_type_node_I (type);
2231 if (node)
2232 {
2233 TypeNode *base_node = lookup_type_node_I (base_type);
2234
2235 if (base_node && base_node->n_supers < node->n_supers)
2236 {
2237 guint n = node->n_supers - base_node->n_supers;
2238
2239 if (node->supers[n] == base_type)
2240 atype = node->supers[n - 1];
2241 }
2242 }
2243
2244 return atype;
2245 }
2246
2247 static inline gboolean
2248 type_node_check_conformities_UorL (TypeNode *node,
2249 TypeNode *iface_node,
2250 /* support_inheritance */
2251 gboolean support_interfaces,
2252 gboolean support_prerequisites,
2253 gboolean have_lock)
2254 {
2255 gboolean match;
2256
2257 if (/* support_inheritance && */
2258 iface_node->n_supers <= node->n_supers &&
2259 node->supers[node->n_supers - iface_node->n_supers] == NODE_TYPE (iface_node))
2260 return TRUE;
2261
2262 support_interfaces = support_interfaces && node->is_instantiatable && NODE_IS_IFACE (iface_node);
2263 support_prerequisites = support_prerequisites && NODE_IS_IFACE (node);
2264 match = FALSE;
2265 if (support_interfaces || support_prerequisites)
2266 {
2267 if (!have_lock)
2268 G_READ_LOCK (&type_rw_lock);
2269 if (support_interfaces && type_lookup_iface_entry_L (node, iface_node))
2270 match = TRUE;
2271 else if (support_prerequisites && type_lookup_prerequisite_L (node, NODE_TYPE (iface_node)))
2272 match = TRUE;
2273 if (!have_lock)
2274 G_READ_UNLOCK (&type_rw_lock);
2275 }
2276 return match;
2277 }
2278
2279 static gboolean
2280 type_node_is_a_L (TypeNode *node,
2281 TypeNode *iface_node)
2282 {
2283 return type_node_check_conformities_UorL (node, iface_node, TRUE, TRUE, TRUE);
2284 }
2285
2286 static inline gboolean
2287 type_node_conforms_to_U (TypeNode *node,
2288 TypeNode *iface_node,
2289 gboolean support_interfaces,
2290 gboolean support_prerequisites)
2291 {
2292 return type_node_check_conformities_UorL (node, iface_node, support_interfaces, support_prerequisites, FALSE);
2293 }
2294
2295 gboolean
2296 g_type_is_a (GType type,
2297 GType iface_type)
2298 {
2299 TypeNode *node, *iface_node;
2300 gboolean is_a;
2301
2302 node = lookup_type_node_I (type);
2303 iface_node = lookup_type_node_I (iface_type);
2304 is_a = node && iface_node && type_node_conforms_to_U (node, iface_node, TRUE, TRUE);
2305
2306 return is_a;
2307 }
2308
2309 GType* /* free result */
2310 g_type_children (GType type,
2311 guint *n_children)
2312 {
2313 TypeNode *node;
2314
2315 node = lookup_type_node_I (type);
2316 if (node)
2317 {
2318 GType *children;
2319
2320 G_READ_LOCK (&type_rw_lock); /* ->children is relocatable */
2321 children = g_new (GType, node->n_children + 1);
2322 memcpy (children, node->children, sizeof (GType) * node->n_children);
2323 children[node->n_children] = 0;
2324
2325 if (n_children)
2326 *n_children = node->n_children;
2327 G_READ_UNLOCK (&type_rw_lock);
2328
2329 return children;
2330 }
2331 else
2332 {
2333 if (n_children)
2334 *n_children = 0;
2335
2336 return NULL;
2337 }
2338 }
2339
2340 GType* /* free result */
2341 g_type_interfaces (GType type,
2342 guint *n_interfaces)
2343 {
2344 TypeNode *node;
2345
2346 node = lookup_type_node_I (type);
2347 if (node && node->is_instantiatable)
2348 {
2349 GType *ifaces;
2350 guint i;
2351
2352 G_READ_LOCK (&type_rw_lock);
2353 ifaces = g_new (GType, CLASSED_NODE_N_IFACES (node) + 1);
2354 for (i = 0; i < CLASSED_NODE_N_IFACES (node); i++)
2355 ifaces[i] = CLASSED_NODE_IFACES_ENTRIES (node)[i].iface_type;
2356 ifaces[i] = 0;
2357
2358 if (n_interfaces)
2359 *n_interfaces = CLASSED_NODE_N_IFACES (node);
2360 G_READ_UNLOCK (&type_rw_lock);
2361
2362 return ifaces;
2363 }
2364 else
2365 {
2366 if (n_interfaces)
2367 *n_interfaces = 0;
2368
2369 return NULL;
2370 }
2371 }
2372
2373 typedef struct _QData QData;
2374 struct _GData
2375 {
2376 guint n_qdatas;
2377 QData *qdatas;
2378 };
2379 struct _QData
2380 {
2381 GQuark quark;
2382 gpointer data;
2383 };
2384
2385 static inline gpointer
2386 type_get_qdata_L (TypeNode *node,
2387 GQuark quark)
2388 {
2389 GData *gdata = node->global_gdata;
2390
2391 if (quark && gdata && gdata->n_qdatas)
2392 {
2393 QData *qdatas = gdata->qdatas - 1;
2394 guint n_qdatas = gdata->n_qdatas;
2395
2396 do
2397 {
2398 guint i;
2399 QData *check;
2400
2401 i = (n_qdatas + 1) / 2;
2402 check = qdatas + i;
2403 if (quark == check->quark)
2404 return check->data;
2405 else if (quark > check->quark)
2406 {
2407 n_qdatas -= i;
2408 qdatas = check;
2409 }
2410 else /* if (quark < check->quark) */
2411 n_qdatas = i - 1;
2412 }
2413 while (n_qdatas);
2414 }
2415 return NULL;
2416 }
2417
2418 gpointer
2419 g_type_get_qdata (GType type,
2420 GQuark quark)
2421 {
2422 TypeNode *node;
2423 gpointer data;
2424
2425 node = lookup_type_node_I (type);
2426 if (node)
2427 {
2428 G_READ_LOCK (&type_rw_lock);
2429 data = type_get_qdata_L (node, quark);
2430 G_READ_UNLOCK (&type_rw_lock);
2431 }
2432 else
2433 {
2434 g_return_val_if_fail (node != NULL, NULL);
2435 data = NULL;
2436 }
2437 return data;
2438 }
2439
2440 static inline void
2441 type_set_qdata_W (TypeNode *node,
2442 GQuark quark,
2443 gpointer data)
2444 {
2445 GData *gdata;
2446 QData *qdata;
2447 guint i;
2448
2449 /* setup qdata list if necessary */
2450 if (!node->global_gdata)
2451 node->global_gdata = g_new0 (GData, 1);
2452 gdata = node->global_gdata;
2453
2454 /* try resetting old data */
2455 qdata = gdata->qdatas;
2456 for (i = 0; i < gdata->n_qdatas; i++)
2457 if (qdata[i].quark == quark)
2458 {
2459 qdata[i].data = data;
2460 return;
2461 }
2462
2463 /* add new entry */
2464 gdata->n_qdatas++;
2465 gdata->qdatas = g_renew (QData, gdata->qdatas, gdata->n_qdatas);
2466 qdata = gdata->qdatas;
2467 for (i = 0; i < gdata->n_qdatas - 1; i++)
2468 if (qdata[i].quark > quark)
2469 break;
2470 g_memmove (qdata + i + 1, qdata + i, sizeof (qdata[0]) * (gdata->n_qdatas - i - 1));
2471 qdata[i].quark = quark;
2472 qdata[i].data = data;
2473 }
2474
2475 void
2476 g_type_set_qdata (GType type,
2477 GQuark quark,
2478 gpointer data)
2479 {
2480 TypeNode *node;
2481
2482 g_return_if_fail (quark != 0);
2483
2484 node = lookup_type_node_I (type);
2485 if (node)
2486 {
2487 G_WRITE_LOCK (&type_rw_lock);
2488 type_set_qdata_W (node, quark, data);
2489 G_WRITE_UNLOCK (&type_rw_lock);
2490 }
2491 else
2492 g_return_if_fail (node != NULL);
2493 }
2494
2495 static void
2496 type_add_flags_W (TypeNode *node,
2497 GTypeFlags flags)
2498 {
2499 guint dflags;
2500
2501 g_return_if_fail ((flags & ~TYPE_FLAG_MASK) == 0);
2502 g_return_if_fail (node != NULL);
2503
2504 if ((flags & TYPE_FLAG_MASK) && node->is_classed && node->data && node->data->class.class)
2505 g_warning ("tagging type `%s' as abstract after class initialization", NODE_NAME (node));
2506 dflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
2507 dflags |= flags;
2508 type_set_qdata_W (node, static_quark_type_flags, GUINT_TO_POINTER (dflags));
2509 }
2510
2511 void
2512 g_type_query (GType type,
2513 GTypeQuery *query)
2514 {
2515 TypeNode *node;
2516
2517 g_return_if_fail (query != NULL);
2518
2519 /* if node is not static and classed, we won't allow query */
2520 query->type = 0;
2521 node = lookup_type_node_I (type);
2522 if (node && node->is_classed && !node->plugin)
2523 {
2524 /* type is classed and probably even instantiatable */
2525 G_READ_LOCK (&type_rw_lock);
2526 if (node->data) /* type is static or referenced */
2527 {
2528 query->type = NODE_TYPE (node);
2529 query->type_name = NODE_NAME (node);
2530 query->class_size = node->data->class.class_size;
2531 query->instance_size = node->is_instantiatable ? node->data->instance.instance_size : 0;
2532 }
2533 G_READ_UNLOCK (&type_rw_lock);
2534 }
2535 }
2536
2537
2538 /* --- implementation details --- */
2539 gboolean
2540 g_type_test_flags (GType type,
2541 guint flags)
2542 {
2543 TypeNode *node;
2544 gboolean result = FALSE;
2545
2546 node = lookup_type_node_I (type);
2547 if (node)
2548 {
2549 guint fflags = flags & TYPE_FUNDAMENTAL_FLAG_MASK;
2550 guint tflags = flags & TYPE_FLAG_MASK;
2551
2552 if (fflags)
2553 {
2554 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (node);
2555
2556 fflags = (finfo->type_flags & fflags) == fflags;
2557 }
2558 else
2559 fflags = TRUE;
2560
2561 if (tflags)
2562 {
2563 G_READ_LOCK (&type_rw_lock);
2564 tflags = (tflags & GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))) == tflags;
2565 G_READ_UNLOCK (&type_rw_lock);
2566 }
2567 else
2568 tflags = TRUE;
2569
2570 result = tflags && fflags;
2571 }
2572
2573 return result;
2574 }
2575
2576 GTypePlugin*
2577 g_type_get_plugin (GType type)
2578 {
2579 TypeNode *node;
2580
2581 node = lookup_type_node_I (type);
2582
2583 return node ? node->plugin : NULL;
2584 }
2585
2586 GTypePlugin*
2587 g_type_interface_get_plugin (GType instance_type,
2588 GType interface_type)
2589 {
2590 TypeNode *node;
2591 TypeNode *iface;
2592
2593 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL); /* G_TYPE_IS_INTERFACE() is an external call: _U */
2594
2595 node = lookup_type_node_I (instance_type);
2596 iface = lookup_type_node_I (interface_type);
2597 if (node && iface)
2598 {
2599 IFaceHolder *iholder;
2600 GTypePlugin *plugin;
2601
2602 G_READ_LOCK (&type_rw_lock);
2603
2604 iholder = iface_node_get_holders_L (iface);
2605 while (iholder && iholder->instance_type != instance_type)
2606 iholder = iholder->next;
2607 plugin = iholder ? iholder->plugin : NULL;
2608
2609 G_READ_UNLOCK (&type_rw_lock);
2610
2611 return plugin;
2612 }
2613
2614 g_return_val_if_fail (node == NULL, NULL);
2615 g_return_val_if_fail (iface == NULL, NULL);
2616
2617 g_warning (G_STRLOC ": attempt to look up plugin for invalid instance/interface type pair.");
2618
2619 return NULL;
2620 }
2621
2622 GType
2623 g_type_fundamental_next (void)
2624 {
2625 GType type;
2626
2627 G_READ_LOCK (&type_rw_lock);
2628 type = static_fundamental_next;
2629 G_READ_UNLOCK (&type_rw_lock);
2630 type = G_TYPE_MAKE_FUNDAMENTAL (type);
2631 return type <= G_TYPE_FUNDAMENTAL_MAX ? type : 0;
2632 }
2633
2634 GType
2635 g_type_fundamental (GType type_id)
2636 {
2637 TypeNode *node = lookup_type_node_I (type_id);
2638
2639 return node ? NODE_FUNDAMENTAL_TYPE (node) : 0;
2640 }
2641
2642 gboolean
2643 g_type_check_instance_is_a (GTypeInstance *type_instance,
2644 GType iface_type)
2645 {
2646 TypeNode *node, *iface;
2647 gboolean check;
2648
2649 if (!type_instance || !type_instance->g_class)
2650 return FALSE;
2651
2652 node = lookup_type_node_I (type_instance->g_class->g_type);
2653 iface = lookup_type_node_I (iface_type);
2654 check = node && node->is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
2655
2656 return check;
2657 }
2658
2659 gboolean
2660 g_type_check_class_is_a (GTypeClass *type_class,
2661 GType is_a_type)
2662 {
2663 TypeNode *node, *iface;
2664 gboolean check;
2665
2666 if (!type_class)
2667 return FALSE;
2668
2669 node = lookup_type_node_I (type_class->g_type);
2670 iface = lookup_type_node_I (is_a_type);
2671 check = node && node->is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
2672
2673 return check;
2674 }
2675
2676 GTypeInstance*
2677 g_type_check_instance_cast (GTypeInstance *type_instance,
2678 GType iface_type)
2679 {
2680 if (type_instance)
2681 {
2682 if (type_instance->g_class)
2683 {
2684 TypeNode *node, *iface;
2685 gboolean is_instantiatable, check;
2686
2687 node = lookup_type_node_I (type_instance->g_class->g_type);
2688 is_instantiatable = node && node->is_instantiatable;
2689 iface = lookup_type_node_I (iface_type);
2690 check = is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
2691 if (check)
2692 return type_instance;
2693
2694 if (is_instantiatable)
2695 g_warning ("invalid cast from `%s' to `%s'",
2696 type_descriptive_name_I (type_instance->g_class->g_type),
2697 type_descriptive_name_I (iface_type));
2698 else
2699 g_warning ("invalid uninstantiatable type `%s' in cast to `%s'",
2700 type_descriptive_name_I (type_instance->g_class->g_type),
2701 type_descriptive_name_I (iface_type));
2702 }
2703 else
2704 g_warning ("invalid unclassed pointer in cast to `%s'",
2705 type_descriptive_name_I (iface_type));
2706 }
2707 else
2708 g_warning ("invalid cast from (NULL) pointer to `%s'",
2709 type_descriptive_name_I (iface_type));
2710
2711 return type_instance;
2712 }
2713
2714 GTypeClass*
2715 g_type_check_class_cast (GTypeClass *type_class,
2716 GType is_a_type)
2717 {
2718 if (type_class)
2719 {
2720 TypeNode *node, *iface;
2721 gboolean is_classed, check;
2722
2723 node = lookup_type_node_I (type_class->g_type);
2724 is_classed = node && node->is_classed;
2725 iface = lookup_type_node_I (is_a_type);
2726 check = is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
2727 if (check)
2728 return type_class;
2729
2730 if (is_classed)
2731 g_warning ("invalid class cast from `%s' to `%s'",
2732 type_descriptive_name_I (type_class->g_type),
2733 type_descriptive_name_I (is_a_type));
2734 else
2735 g_warning ("invalid unclassed type `%s' in class cast to `%s'",
2736 type_descriptive_name_I (type_class->g_type),
2737 type_descriptive_name_I (is_a_type));
2738 }
2739 else
2740 g_warning ("invalid class cast from (NULL) pointer to `%s'",
2741 type_descriptive_name_I (is_a_type));
2742 return type_class;
2743 }
2744
2745 gboolean
2746 g_type_check_instance (GTypeInstance *type_instance)
2747 {
2748 /* this function is just here to make the signal system
2749 * conveniently elaborated on instance checks
2750 */
2751 if (type_instance)
2752 {
2753 if (type_instance->g_class)
2754 {
2755 TypeNode *node = lookup_type_node_I (type_instance->g_class->g_type);
2756
2757 if (node && node->is_instantiatable)
2758 return TRUE;
2759
2760 g_warning ("instance of invalid non-instantiatable type `%s'",
2761 type_descriptive_name_I (type_instance->g_class->g_type));
2762 }
2763 else
2764 g_warning ("instance with invalid (NULL) class pointer");
2765 }
2766 else
2767 g_warning ("invalid (NULL) pointer instance");
2768
2769 return FALSE;
2770 }
2771
2772 static inline gboolean
2773 type_check_is_value_type_U (GType type)
2774 {
2775 GTypeFlags tflags = G_TYPE_FLAG_VALUE_ABSTRACT;
2776 TypeNode *node;
2777
2778 /* common path speed up */
2779 node = lookup_type_node_I (type);
2780 if (node && node->mutatable_check_cache)
2781 return TRUE;
2782
2783 G_READ_LOCK (&type_rw_lock);
2784 restart_check:
2785 if (node)
2786 {
2787 if (node->data && node->data->common.ref_count > 0 &&
2788 node->data->common.value_table->value_init)
2789 tflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
2790 else if (NODE_IS_IFACE (node))
2791 {
2792 guint i;
2793
2794 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
2795 {
2796 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
2797 TypeNode *prnode = lookup_type_node_I (prtype);
2798
2799 if (prnode->is_instantiatable)
2800 {
2801 type = prtype;
2802 node = lookup_type_node_I (type);
2803 goto restart_check;
2804 }
2805 }
2806 }
2807 }
2808 G_READ_UNLOCK (&type_rw_lock);
2809
2810 return !(tflags & G_TYPE_FLAG_VALUE_ABSTRACT);
2811 }
2812
2813 gboolean
2814 g_type_check_is_value_type (GType type)
2815 {
2816 return type_check_is_value_type_U (type);
2817 }
2818
2819 gboolean
2820 g_type_check_value (GValue *value)
2821 {
2822 return value && type_check_is_value_type_U (value->g_type);
2823 }
2824
2825 gboolean
2826 g_type_check_value_holds (GValue *value,
2827 GType type)
2828 {
2829 return value && type_check_is_value_type_U (value->g_type) && g_type_is_a (value->g_type, type);
2830 }
2831
2832 GTypeValueTable*
2833 g_type_value_table_peek (GType type)
2834 {
2835 GTypeValueTable *vtable = NULL;
2836 TypeNode *node = lookup_type_node_I (type);
2837 gboolean has_refed_data, has_table;
2838 TypeData *data;
2839
2840 /* speed up common code path, we're not 100% safe here,
2841 * but we should only get called with referenced types anyway
2842 */
2843 data = node ? node->data : NULL;
2844 if (node && node->mutatable_check_cache)
2845 return data->common.value_table;
2846
2847 G_READ_LOCK (&type_rw_lock);
2848
2849 restart_table_peek:
2850 has_refed_data = node && node->data && node->data->common.ref_count;
2851 has_table = has_refed_data && node->data->common.value_table->value_init;
2852 if (has_refed_data)
2853 {
2854 if (has_table)
2855 vtable = node->data->common.value_table;
2856 else if (NODE_IS_IFACE (node))
2857 {
2858 guint i;
2859
2860 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
2861 {
2862 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
2863 TypeNode *prnode = lookup_type_node_I (prtype);
2864
2865 if (prnode->is_instantiatable)
2866 {
2867 type = prtype;
2868 node = lookup_type_node_I (type);
2869 goto restart_table_peek;
2870 }
2871 }
2872 }
2873 }
2874
2875 G_READ_UNLOCK (&type_rw_lock);
2876
2877 if (vtable)
2878 return vtable;
2879
2880 if (!node)
2881 g_warning (G_STRLOC ": type id `%lu' is invalid", type);
2882 if (!has_refed_data)
2883 g_warning ("can't peek value table for type `%s' which is not currently referenced",
2884 type_descriptive_name_I (type));
2885
2886 return NULL;
2887 }
2888
2889 G_CONST_RETURN gchar*
2890 g_type_name_from_instance (GTypeInstance *instance)
2891 {
2892 if (!instance)
2893 return "<NULL-instance>";
2894 else
2895 return g_type_name_from_class (instance->g_class);
2896 }
2897
2898 G_CONST_RETURN gchar*
2899 g_type_name_from_class (GTypeClass *g_class)
2900 {
2901 if (!g_class)
2902 return "<NULL-class>";
2903 else
2904 return g_type_name (g_class->g_type);
2905 }
2906
2907
2908 /* --- foreign prototypes --- */
2909 extern void g_value_c_init (void); /* sync with gvalue.c */
2910 extern void g_value_types_init (void); /* sync with gvaluetypes.c */
2911 extern void g_enum_types_init (void); /* sync with genums.c */
2912 extern void g_param_type_init (void); /* sync with gparam.c */
2913 extern void g_boxed_type_init (void); /* sync with gboxed.c */
2914 extern void g_object_type_init (void); /* sync with gobject.c */
2915 extern void g_param_spec_types_init (void); /* sync with gparamspecs.c */
2916 extern void g_value_transforms_init (void); /* sync with gvaluetransform.c */
2917 extern void g_signal_init (void); /* sync with gsignal.c */
2918
2919
2920 /* --- initialization --- */
2921 void
2922 g_type_init_with_debug_flags (GTypeDebugFlags debug_flags)
2923 {
2924 G_LOCK_DEFINE_STATIC (type_init_lock);
2925 const gchar *env_string;
2926 GTypeInfo info;
2927 TypeNode *node;
2928 GType type;
2929
2930 G_LOCK (type_init_lock);
2931
2932 G_WRITE_LOCK (&type_rw_lock);
2933
2934 if (static_quark_type_flags)
2935 {
2936 G_WRITE_UNLOCK (&type_rw_lock);
2937 G_UNLOCK (type_init_lock);
2938 return;
2939 }
2940
2941 /* setup GObject library wide debugging flags */
2942 _g_type_debug_flags = debug_flags & G_TYPE_DEBUG_MASK;
2943 env_string = g_getenv ("GOBJECT_DEBUG");
2944 if (env_string != NULL)
2945 {
2946 static GDebugKey debug_keys[] = {
2947 { "objects", G_TYPE_DEBUG_OBJECTS },
2948 { "signals", G_TYPE_DEBUG_SIGNALS },
2949 };
2950
2951 _g_type_debug_flags |= g_parse_debug_string (env_string,
2952 debug_keys,
2953 sizeof (debug_keys) / sizeof (debug_keys[0]));
2954 env_string = NULL;
2955 }
2956
2957 /* quarks */
2958 static_quark_type_flags = g_quark_from_static_string ("-g-type-private--GTypeFlags");
2959 static_quark_iface_holder = g_quark_from_static_string ("-g-type-private--IFaceHolder");
2960 static_quark_dependants_array = g_quark_from_static_string ("-g-type-private--dependants-array");
2961
2962 /* type qname hash table */
2963 static_type_nodes_ht = g_hash_table_new (g_direct_hash, g_direct_equal);
2964
2965 /* invalid type G_TYPE_INVALID (0)
2966 */
2967 static_fundamental_type_nodes[0] = NULL;
2968
2969 /* void type G_TYPE_NONE
2970 */
2971 node = type_node_fundamental_new_W (G_TYPE_NONE, "void", 0);
2972 type = NODE_TYPE (node);
2973 g_assert (type == G_TYPE_NONE);
2974
2975 /* interface fundamental type G_TYPE_INTERFACE (!classed)
2976 */
2977 memset (&info, 0, sizeof (info));
2978 node = type_node_fundamental_new_W (G_TYPE_INTERFACE, "GInterface", G_TYPE_FLAG_DERIVABLE);
2979 type = NODE_TYPE (node);
2980 type_data_make_W (node, &info, NULL);
2981 g_assert (type == G_TYPE_INTERFACE);
2982
2983 G_WRITE_UNLOCK (&type_rw_lock);
2984
2985 g_value_c_init ();
2986
2987 /* G_TYPE_TYPE_PLUGIN
2988 */
2989 g_type_plugin_get_type ();
2990
2991 /* G_TYPE_* value types
2992 */
2993 g_value_types_init ();
2994
2995 /* G_TYPE_ENUM & G_TYPE_FLAGS
2996 */
2997 g_enum_types_init ();
2998
2999 /* G_TYPE_BOXED
3000 */
3001 g_boxed_type_init ();
3002
3003 /* G_TYPE_PARAM
3004 */
3005 g_param_type_init ();
3006
3007 /* G_TYPE_OBJECT
3008 */
3009 g_object_type_init ();
3010
3011 /* G_TYPE_PARAM_* pspec types
3012 */
3013 g_param_spec_types_init ();
3014
3015 /* Value Transformations
3016 */
3017 g_value_transforms_init ();
3018
3019 /* Signal system
3020 */
3021 g_signal_init ();
3022
3023 G_UNLOCK (type_init_lock);
3024 }
3025
3026 void
3027 g_type_init (void)
3028 {
3029 g_type_init_with_debug_flags (0);
3030 }
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