1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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.
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.
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.
29 #include "gtype-private.h"
30 #include "gtypeplugin.h"
31 #include "gvaluecollector.h"
32 #include "gbsearcharray.h"
33 #include "gobjectalias.h"
34 #include "gatomicarray.h"
39 * @short_description: The GLib Runtime type identification and
41 * @title:Type Information
43 * The GType API is the foundation of the GObject system. It provides the
44 * facilities for registering and managing all fundamental data types,
45 * user-defined object and interface types. Before using any GType
46 * or GObject functions, g_type_init() must be called to initialize the
49 * For type creation and registration purposes, all types fall into one of
50 * two categories: static or dynamic. Static types are never loaded or
51 * unloaded at run-time as dynamic types may be. Static types are created
52 * with g_type_register_static() that gets type specific information passed
53 * in via a #GTypeInfo structure.
54 * Dynamic types are created with g_type_register_dynamic() which takes a
55 * #GTypePlugin structure instead. The remaining type information (the
56 * #GTypeInfo structure) is retrieved during runtime through #GTypePlugin
57 * and the g_type_plugin_*() API.
58 * These registration functions are usually called only once from a
59 * function whose only purpose is to return the type identifier for a
60 * specific class. Once the type (or class or interface) is registered,
61 * it may be instantiated, inherited, or implemented depending on exactly
62 * what sort of type it is.
63 * There is also a third registration function for registering fundamental
64 * types called g_type_register_fundamental() which requires both a #GTypeInfo
65 * structure and a #GTypeFundamentalInfo structure but it is seldom used
66 * since most fundamental types are predefined rather than user-defined.
68 * A final word about type names.
69 * Such an identifier needs to be at least three characters long. There is no
70 * upper length limit. The first character needs to be a letter (a-z or A-Z)
71 * or an underscore '_'. Subsequent characters can be letters, numbers or
76 /* NOTE: some functions (some internal variants and exported ones)
77 * invalidate data portions of the TypeNodes. if external functions/callbacks
78 * are called, pointers to memory maintained by TypeNodes have to be looked up
79 * again. this affects most of the struct TypeNode fields, e.g. ->children or
80 * CLASSED_NODE_IFACES_ENTRIES() respectively IFACE_NODE_PREREQUISITES() (but
81 * not ->supers[]), as all those memory portions can get realloc()ed during
82 * callback invocation.
85 * - g_type_from_name() should do an ordered array lookup after fetching the
86 * the quark, instead of a second hashtable lookup.
89 * lock handling issues when calling static functions are indicated by
90 * uppercase letter postfixes, all static functions have to have
91 * one of the below postfixes:
92 * - _I: [Indifferent about locking]
93 * function doesn't care about locks at all
94 * - _U: [Unlocked invocation]
95 * no read or write lock has to be held across function invocation
96 * (locks may be acquired and released during invocation though)
97 * - _L: [Locked invocation]
98 * a write lock or more than 0 read locks have to be held across
100 * - _W: [Write-locked invocation]
101 * a write lock has to be held across function invocation
102 * - _Wm: [Write-locked invocation, mutatable]
103 * like _W, but the write lock might be released and reacquired
104 * during invocation, watch your pointers
105 * - _WmREC: [Write-locked invocation, mutatable, recursive]
106 * like _Wm, but also acquires recursive mutex class_init_rec_mutex
110 #define G_READ_LOCK(rw_lock) do { g_printerr (G_STRLOC ": readL++\n"); g_static_rw_lock_reader_lock (rw_lock); } while (0)
111 #define G_READ_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": readL--\n"); g_static_rw_lock_reader_unlock (rw_lock); } while (0)
112 #define G_WRITE_LOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL++\n"); g_static_rw_lock_writer_lock (rw_lock); } while (0)
113 #define G_WRITE_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL--\n"); g_static_rw_lock_writer_unlock (rw_lock); } while (0)
115 #define G_READ_LOCK(rw_lock) g_static_rw_lock_reader_lock (rw_lock)
116 #define G_READ_UNLOCK(rw_lock) g_static_rw_lock_reader_unlock (rw_lock)
117 #define G_WRITE_LOCK(rw_lock) g_static_rw_lock_writer_lock (rw_lock)
118 #define G_WRITE_UNLOCK(rw_lock) g_static_rw_lock_writer_unlock (rw_lock)
120 #define INVALID_RECURSION(func, arg, type_name) G_STMT_START{ \
121 static const gchar _action[] = " invalidly modified type "; \
122 gpointer _arg = (gpointer) (arg); const gchar *_tname = (type_name), *_fname = (func); \
124 g_error ("%s(%p)%s`%s'", _fname, _arg, _action, _tname); \
126 g_error ("%s()%s`%s'", _fname, _action, _tname); \
128 #define g_return_val_if_type_system_uninitialized(return_value) G_STMT_START{ \
129 if (G_UNLIKELY (!static_quark_type_flags)) \
131 g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
132 "%s: You forgot to call g_type_init()", \
134 return (return_value); \
138 #ifdef G_ENABLE_DEBUG
139 #define DEBUG_CODE(debug_type, code_block) G_STMT_START { \
140 if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) \
143 #else /* !G_ENABLE_DEBUG */
144 #define DEBUG_CODE(debug_type, code_block) /* code_block */
145 #endif /* G_ENABLE_DEBUG */
147 #define TYPE_FUNDAMENTAL_FLAG_MASK (G_TYPE_FLAG_CLASSED | \
148 G_TYPE_FLAG_INSTANTIATABLE | \
149 G_TYPE_FLAG_DERIVABLE | \
150 G_TYPE_FLAG_DEEP_DERIVABLE)
151 #define TYPE_FLAG_MASK (G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT)
152 #define SIZEOF_FUNDAMENTAL_INFO ((gssize) MAX (MAX (sizeof (GTypeFundamentalInfo), \
153 sizeof (gpointer)), \
156 /* The 2*sizeof(size_t) alignment here is borrowed from
157 * GNU libc, so it should be good most everywhere.
158 * It is more conservative than is needed on some 64-bit
159 * platforms, but ia64 does require a 16-byte alignment.
160 * The SIMD extensions for x86 and ppc32 would want a
161 * larger alignment than this, but we don't need to
162 * do better than malloc.
164 #define STRUCT_ALIGNMENT (2 * sizeof (gsize))
165 #define ALIGN_STRUCT(offset) \
166 ((offset + (STRUCT_ALIGNMENT - 1)) & -STRUCT_ALIGNMENT)
169 /* --- typedefs --- */
170 typedef struct _TypeNode TypeNode;
171 typedef struct _CommonData CommonData;
172 typedef struct _BoxedData BoxedData;
173 typedef struct _IFaceData IFaceData;
174 typedef struct _ClassData ClassData;
175 typedef struct _InstanceData InstanceData;
176 typedef union _TypeData TypeData;
177 typedef struct _IFaceEntries IFaceEntries;
178 typedef struct _IFaceEntry IFaceEntry;
179 typedef struct _IFaceHolder IFaceHolder;
182 /* --- prototypes --- */
183 static inline GTypeFundamentalInfo* type_node_fundamental_info_I (TypeNode *node);
184 static void type_add_flags_W (TypeNode *node,
186 static void type_data_make_W (TypeNode *node,
187 const GTypeInfo *info,
188 const GTypeValueTable *value_table);
189 static inline void type_data_ref_Wm (TypeNode *node);
190 static inline void type_data_unref_U (TypeNode *node,
192 static void type_data_last_unref_Wm (TypeNode * node,
194 static inline gpointer type_get_qdata_L (TypeNode *node,
196 static inline void type_set_qdata_W (TypeNode *node,
199 static IFaceHolder* type_iface_peek_holder_L (TypeNode *iface,
200 GType instance_type);
201 static gboolean type_iface_vtable_base_init_Wm (TypeNode *iface,
203 static void type_iface_vtable_iface_init_Wm (TypeNode *iface,
205 static gboolean type_node_is_a_L (TypeNode *node,
206 TypeNode *iface_node);
209 /* --- enumeration --- */
211 /* The InitState enumeration is used to track the progress of initializing
212 * both classes and interface vtables. Keeping the state of initialization
213 * is necessary to handle new interfaces being added while we are initializing
214 * the class or other interfaces.
226 /* --- structures --- */
229 guint volatile ref_count;
231 guint n_children; /* writable with lock */
233 guint n_prerequisites : 9;
234 guint is_classed : 1;
235 guint is_instantiatable : 1;
236 guint mutatable_check_cache : 1; /* combines some common path checks */
237 GType *children; /* writable with lock */
238 TypeData * volatile data;
242 GAtomicArray iface_entries; /* for !iface types */
243 GAtomicArray offsets;
245 GType *prerequisites;
246 GType supers[1]; /* flexible array */
249 #define SIZEOF_BASE_TYPE_NODE() (G_STRUCT_OFFSET (TypeNode, supers))
250 #define MAX_N_SUPERS (255)
251 #define MAX_N_CHILDREN (4095)
252 #define MAX_N_INTERFACES (255) /* Limited by offsets being 8 bits */
253 #define MAX_N_PREREQUISITES (511)
254 #define NODE_TYPE(node) (node->supers[0])
255 #define NODE_PARENT_TYPE(node) (node->supers[1])
256 #define NODE_FUNDAMENTAL_TYPE(node) (node->supers[node->n_supers])
257 #define NODE_NAME(node) (g_quark_to_string (node->qname))
258 #define NODE_REFCOUNT(node) ((guint) g_atomic_int_get ((int *) &(node)->ref_count))
259 #define NODE_IS_BOXED(node) (NODE_FUNDAMENTAL_TYPE (node) == G_TYPE_BOXED)
260 #define NODE_IS_IFACE(node) (NODE_FUNDAMENTAL_TYPE (node) == G_TYPE_INTERFACE)
261 #define CLASSED_NODE_IFACES_ENTRIES(node) (&(node)->_prot.iface_entries)
262 #define CLASSED_NODE_IFACES_ENTRIES_LOCKED(node)(G_ATOMIC_ARRAY_GET_LOCKED(CLASSED_NODE_IFACES_ENTRIES((node)), IFaceEntries))
263 #define IFACE_NODE_N_PREREQUISITES(node) ((node)->n_prerequisites)
264 #define IFACE_NODE_PREREQUISITES(node) ((node)->prerequisites)
265 #define iface_node_get_holders_L(node) ((IFaceHolder*) type_get_qdata_L ((node), static_quark_iface_holder))
266 #define iface_node_set_holders_W(node, holders) (type_set_qdata_W ((node), static_quark_iface_holder, (holders)))
267 #define iface_node_get_dependants_array_L(n) ((GType*) type_get_qdata_L ((n), static_quark_dependants_array))
268 #define iface_node_set_dependants_array_W(n,d) (type_set_qdata_W ((n), static_quark_dependants_array, (d)))
269 #define TYPE_ID_MASK ((GType) ((1 << G_TYPE_FUNDAMENTAL_SHIFT) - 1))
271 #define NODE_IS_ANCESTOR(ancestor, node) \
272 ((ancestor)->n_supers <= (node)->n_supers && \
273 (node)->supers[(node)->n_supers - (ancestor)->n_supers] == NODE_TYPE (ancestor))
278 GInterfaceInfo *info;
286 GTypeInterface *vtable;
287 InitState init_state;
290 struct _IFaceEntries {
295 #define IFACE_ENTRIES_HEADER_SIZE (sizeof(IFaceEntries) - sizeof(IFaceEntry))
296 #define IFACE_ENTRIES_N_ENTRIES(_entries) ( (G_ATOMIC_ARRAY_DATA_SIZE((_entries)) - IFACE_ENTRIES_HEADER_SIZE) / sizeof(IFaceEntry) )
300 GTypeValueTable *value_table;
306 GBoxedCopyFunc copy_func;
307 GBoxedFreeFunc free_func;
314 GBaseInitFunc vtable_init_base;
315 GBaseFinalizeFunc vtable_finalize_base;
316 GClassInitFunc dflt_init;
317 GClassFinalizeFunc dflt_finalize;
318 gconstpointer dflt_data;
319 gpointer dflt_vtable;
326 guint16 class_private_size;
327 int volatile init_state; /* atomic - g_type_class_ref reads it unlocked */
328 GBaseInitFunc class_init_base;
329 GBaseFinalizeFunc class_finalize_base;
330 GClassInitFunc class_init;
331 GClassFinalizeFunc class_finalize;
332 gconstpointer class_data;
340 guint16 class_private_size;
341 int volatile init_state; /* atomic - g_type_class_ref reads it unlocked */
342 GBaseInitFunc class_init_base;
343 GBaseFinalizeFunc class_finalize_base;
344 GClassInitFunc class_init;
345 GClassFinalizeFunc class_finalize;
346 gconstpointer class_data;
348 guint16 instance_size;
349 guint16 private_size;
351 GInstanceInitFunc instance_init;
360 InstanceData instance;
365 GTypeClassCacheFunc cache_func;
370 GTypeInterfaceCheckFunc check_func;
374 /* --- variables --- */
375 static GStaticRWLock type_rw_lock = G_STATIC_RW_LOCK_INIT;
376 static GStaticRecMutex class_init_rec_mutex = G_STATIC_REC_MUTEX_INIT;
377 static guint static_n_class_cache_funcs = 0;
378 static ClassCacheFunc *static_class_cache_funcs = NULL;
379 static guint static_n_iface_check_funcs = 0;
380 static IFaceCheckFunc *static_iface_check_funcs = NULL;
381 static GQuark static_quark_type_flags = 0;
382 static GQuark static_quark_iface_holder = 0;
383 static GQuark static_quark_dependants_array = 0;
384 GTypeDebugFlags _g_type_debug_flags = 0;
386 /* --- type nodes --- */
387 static GHashTable *static_type_nodes_ht = NULL;
388 static TypeNode *static_fundamental_type_nodes[(G_TYPE_FUNDAMENTAL_MAX >> G_TYPE_FUNDAMENTAL_SHIFT) + 1] = { NULL, };
389 static GType static_fundamental_next = G_TYPE_RESERVED_USER_FIRST;
391 static inline TypeNode*
392 lookup_type_node_I (register GType utype)
394 if (utype > G_TYPE_FUNDAMENTAL_MAX)
395 return (TypeNode*) (utype & ~TYPE_ID_MASK);
397 return static_fundamental_type_nodes[utype >> G_TYPE_FUNDAMENTAL_SHIFT];
401 type_node_any_new_W (TypeNode *pnode,
405 GTypeFundamentalFlags type_flags)
410 guint i, node_size = 0;
412 n_supers = pnode ? pnode->n_supers + 1 : 0;
415 node_size += SIZEOF_FUNDAMENTAL_INFO; /* fundamental type info */
416 node_size += SIZEOF_BASE_TYPE_NODE (); /* TypeNode structure */
417 node_size += (sizeof (GType) * (1 + n_supers + 1)); /* self + ancestors + (0) for ->supers[] */
418 node = g_malloc0 (node_size);
419 if (!pnode) /* offset fundamental types */
421 node = G_STRUCT_MEMBER_P (node, SIZEOF_FUNDAMENTAL_INFO);
422 static_fundamental_type_nodes[ftype >> G_TYPE_FUNDAMENTAL_SHIFT] = node;
428 g_assert ((type & TYPE_ID_MASK) == 0);
430 node->n_supers = n_supers;
433 node->supers[0] = type;
436 node->is_classed = (type_flags & G_TYPE_FLAG_CLASSED) != 0;
437 node->is_instantiatable = (type_flags & G_TYPE_FLAG_INSTANTIATABLE) != 0;
439 if (NODE_IS_IFACE (node))
441 IFACE_NODE_N_PREREQUISITES (node) = 0;
442 IFACE_NODE_PREREQUISITES (node) = NULL;
445 _g_atomic_array_init (CLASSED_NODE_IFACES_ENTRIES (node));
449 node->supers[0] = type;
450 memcpy (node->supers + 1, pnode->supers, sizeof (GType) * (1 + pnode->n_supers + 1));
452 node->is_classed = pnode->is_classed;
453 node->is_instantiatable = pnode->is_instantiatable;
455 if (NODE_IS_IFACE (node))
457 IFACE_NODE_N_PREREQUISITES (node) = 0;
458 IFACE_NODE_PREREQUISITES (node) = NULL;
463 IFaceEntries *entries;
465 entries = _g_atomic_array_copy (CLASSED_NODE_IFACES_ENTRIES (pnode),
466 IFACE_ENTRIES_HEADER_SIZE,
470 for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (entries); j++)
472 entries->entry[j].vtable = NULL;
473 entries->entry[j].init_state = UNINITIALIZED;
475 _g_atomic_array_update (CLASSED_NODE_IFACES_ENTRIES (node),
480 i = pnode->n_children++;
481 pnode->children = g_renew (GType, pnode->children, pnode->n_children);
482 pnode->children[i] = type;
485 node->plugin = plugin;
486 node->n_children = 0;
487 node->children = NULL;
489 node->qname = g_quark_from_string (name);
490 node->global_gdata = NULL;
492 g_hash_table_insert (static_type_nodes_ht,
493 GUINT_TO_POINTER (node->qname),
498 static inline GTypeFundamentalInfo*
499 type_node_fundamental_info_I (TypeNode *node)
501 GType ftype = NODE_FUNDAMENTAL_TYPE (node);
503 if (ftype != NODE_TYPE (node))
504 node = lookup_type_node_I (ftype);
506 return node ? G_STRUCT_MEMBER_P (node, -SIZEOF_FUNDAMENTAL_INFO) : NULL;
510 type_node_fundamental_new_W (GType ftype,
512 GTypeFundamentalFlags type_flags)
514 GTypeFundamentalInfo *finfo;
517 g_assert ((ftype & TYPE_ID_MASK) == 0);
518 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX);
520 if (ftype >> G_TYPE_FUNDAMENTAL_SHIFT == static_fundamental_next)
521 static_fundamental_next++;
523 type_flags &= TYPE_FUNDAMENTAL_FLAG_MASK;
525 node = type_node_any_new_W (NULL, ftype, name, NULL, type_flags);
527 finfo = type_node_fundamental_info_I (node);
528 finfo->type_flags = type_flags;
534 type_node_new_W (TypeNode *pnode,
540 g_assert (pnode->n_supers < MAX_N_SUPERS);
541 g_assert (pnode->n_children < MAX_N_CHILDREN);
543 return type_node_any_new_W (pnode, NODE_FUNDAMENTAL_TYPE (pnode), name, plugin, 0);
546 static inline IFaceEntry*
547 lookup_iface_entry_I (volatile IFaceEntries *entries,
548 TypeNode *iface_node)
559 G_ATOMIC_ARRAY_DO_TRANSACTION
560 (&iface_node->_prot.offsets, guint8,
563 offsets = transaction_data;
564 offset_index = entries->offset_index;
565 if (offsets != NULL &&
566 offset_index < G_ATOMIC_ARRAY_DATA_SIZE(offsets))
568 index = offsets[offset_index];
571 /* zero means unset, subtract one to get real index */
574 if (index < IFACE_ENTRIES_N_ENTRIES (entries))
576 check = (IFaceEntry *)&entries->entry[index];
577 if (check->iface_type == NODE_TYPE (iface_node))
587 static inline IFaceEntry*
588 type_lookup_iface_entry_L (TypeNode *node,
589 TypeNode *iface_node)
591 if (!NODE_IS_IFACE (iface_node))
594 return lookup_iface_entry_I (CLASSED_NODE_IFACES_ENTRIES_LOCKED (node),
599 static inline gboolean
600 type_lookup_iface_vtable_I (TypeNode *node,
601 TypeNode *iface_node,
602 gpointer *vtable_ptr)
607 if (!NODE_IS_IFACE (iface_node))
614 G_ATOMIC_ARRAY_DO_TRANSACTION
615 (CLASSED_NODE_IFACES_ENTRIES (node), IFaceEntries,
617 entry = lookup_iface_entry_I (transaction_data, iface_node);
622 *vtable_ptr = entry->vtable;
631 static inline gboolean
632 type_lookup_prerequisite_L (TypeNode *iface,
633 GType prerequisite_type)
635 if (NODE_IS_IFACE (iface) && IFACE_NODE_N_PREREQUISITES (iface))
637 GType *prerequisites = IFACE_NODE_PREREQUISITES (iface) - 1;
638 guint n_prerequisites = IFACE_NODE_N_PREREQUISITES (iface);
645 i = (n_prerequisites + 1) >> 1;
646 check = prerequisites + i;
647 if (prerequisite_type == *check)
649 else if (prerequisite_type > *check)
651 n_prerequisites -= i;
652 prerequisites = check;
654 else /* if (prerequisite_type < *check) */
655 n_prerequisites = i - 1;
657 while (n_prerequisites);
663 type_descriptive_name_I (GType type)
667 TypeNode *node = lookup_type_node_I (type);
669 return node ? NODE_NAME (node) : "<unknown>";
676 /* --- type consistency checks --- */
678 check_plugin_U (GTypePlugin *plugin,
679 gboolean need_complete_type_info,
680 gboolean need_complete_interface_info,
681 const gchar *type_name)
683 /* G_IS_TYPE_PLUGIN() and G_TYPE_PLUGIN_GET_CLASS() are external calls: _U
687 g_warning ("plugin handle for type `%s' is NULL",
691 if (!G_IS_TYPE_PLUGIN (plugin))
693 g_warning ("plugin pointer (%p) for type `%s' is invalid",
697 if (need_complete_type_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_type_info)
699 g_warning ("plugin for type `%s' has no complete_type_info() implementation",
703 if (need_complete_interface_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_interface_info)
705 g_warning ("plugin for type `%s' has no complete_interface_info() implementation",
713 check_type_name_I (const gchar *type_name)
715 static const gchar extra_chars[] = "-_+";
716 const gchar *p = type_name;
719 if (!type_name[0] || !type_name[1] || !type_name[2])
721 g_warning ("type name `%s' is too short", type_name);
724 /* check the first letter */
725 name_valid = (p[0] >= 'A' && p[0] <= 'Z') || (p[0] >= 'a' && p[0] <= 'z') || p[0] == '_';
726 for (p = type_name + 1; *p; p++)
727 name_valid &= ((p[0] >= 'A' && p[0] <= 'Z') ||
728 (p[0] >= 'a' && p[0] <= 'z') ||
729 (p[0] >= '0' && p[0] <= '9') ||
730 strchr (extra_chars, p[0]));
733 g_warning ("type name `%s' contains invalid characters", type_name);
736 if (g_type_from_name (type_name))
738 g_warning ("cannot register existing type `%s'", type_name);
746 check_derivation_I (GType parent_type,
747 const gchar *type_name)
750 GTypeFundamentalInfo* finfo;
752 pnode = lookup_type_node_I (parent_type);
755 g_warning ("cannot derive type `%s' from invalid parent type `%s'",
757 type_descriptive_name_I (parent_type));
760 finfo = type_node_fundamental_info_I (pnode);
761 /* ensure flat derivability */
762 if (!(finfo->type_flags & G_TYPE_FLAG_DERIVABLE))
764 g_warning ("cannot derive `%s' from non-derivable parent type `%s'",
769 /* ensure deep derivability */
770 if (parent_type != NODE_FUNDAMENTAL_TYPE (pnode) &&
771 !(finfo->type_flags & G_TYPE_FLAG_DEEP_DERIVABLE))
773 g_warning ("cannot derive `%s' from non-fundamental parent type `%s'",
783 check_collect_format_I (const gchar *collect_format)
785 const gchar *p = collect_format;
786 gchar valid_format[] = { G_VALUE_COLLECT_INT, G_VALUE_COLLECT_LONG,
787 G_VALUE_COLLECT_INT64, G_VALUE_COLLECT_DOUBLE,
788 G_VALUE_COLLECT_POINTER, 0 };
791 if (!strchr (valid_format, *p++))
793 return p - collect_format <= G_VALUE_COLLECT_FORMAT_MAX_LENGTH;
797 check_value_table_I (const gchar *type_name,
798 const GTypeValueTable *value_table)
802 else if (value_table->value_init == NULL)
804 if (value_table->value_free || value_table->value_copy ||
805 value_table->value_peek_pointer ||
806 value_table->collect_format || value_table->collect_value ||
807 value_table->lcopy_format || value_table->lcopy_value)
808 g_warning ("cannot handle uninitializable values of type `%s'",
812 else /* value_table->value_init != NULL */
814 if (!value_table->value_free)
817 * g_warning ("missing `value_free()' for type `%s'", type_name);
821 if (!value_table->value_copy)
823 g_warning ("missing `value_copy()' for type `%s'", type_name);
826 if ((value_table->collect_format || value_table->collect_value) &&
827 (!value_table->collect_format || !value_table->collect_value))
829 g_warning ("one of `collect_format' and `collect_value()' is unspecified for type `%s'",
833 if (value_table->collect_format && !check_collect_format_I (value_table->collect_format))
835 g_warning ("the `%s' specification for type `%s' is too long or invalid",
840 if ((value_table->lcopy_format || value_table->lcopy_value) &&
841 (!value_table->lcopy_format || !value_table->lcopy_value))
843 g_warning ("one of `lcopy_format' and `lcopy_value()' is unspecified for type `%s'",
847 if (value_table->lcopy_format && !check_collect_format_I (value_table->lcopy_format))
849 g_warning ("the `%s' specification for type `%s' is too long or invalid",
859 check_type_info_I (TypeNode *pnode,
861 const gchar *type_name,
862 const GTypeInfo *info)
864 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (lookup_type_node_I (ftype));
865 gboolean is_interface = ftype == G_TYPE_INTERFACE;
867 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX && !(ftype & TYPE_ID_MASK));
869 /* check instance members */
870 if (!(finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
871 (info->instance_size || info->n_preallocs || info->instance_init))
874 g_warning ("cannot instantiate `%s', derived from non-instantiatable parent type `%s'",
878 g_warning ("cannot instantiate `%s' as non-instantiatable fundamental",
882 /* check class & interface members */
883 if (!((finfo->type_flags & G_TYPE_FLAG_CLASSED) || is_interface) &&
884 (info->class_init || info->class_finalize || info->class_data ||
885 info->class_size || info->base_init || info->base_finalize))
888 g_warning ("cannot create class for `%s', derived from non-classed parent type `%s'",
892 g_warning ("cannot create class for `%s' as non-classed fundamental",
896 /* check interface size */
897 if (is_interface && info->class_size < sizeof (GTypeInterface))
899 g_warning ("specified interface size for type `%s' is smaller than `GTypeInterface' size",
903 /* check class size */
904 if (finfo->type_flags & G_TYPE_FLAG_CLASSED)
906 if (info->class_size < sizeof (GTypeClass))
908 g_warning ("specified class size for type `%s' is smaller than `GTypeClass' size",
912 if (pnode && info->class_size < pnode->data->class.class_size)
914 g_warning ("specified class size for type `%s' is smaller "
915 "than the parent type's `%s' class size",
921 /* check instance size */
922 if (finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE)
924 if (info->instance_size < sizeof (GTypeInstance))
926 g_warning ("specified instance size for type `%s' is smaller than `GTypeInstance' size",
930 if (pnode && info->instance_size < pnode->data->instance.instance_size)
932 g_warning ("specified instance size for type `%s' is smaller "
933 "than the parent type's `%s' instance size",
944 find_conforming_child_type_L (TypeNode *pnode,
947 TypeNode *node = NULL;
950 if (type_lookup_iface_entry_L (pnode, iface))
953 for (i = 0; i < pnode->n_children && !node; i++)
954 node = find_conforming_child_type_L (lookup_type_node_I (pnode->children[i]), iface);
960 check_add_interface_L (GType instance_type,
963 TypeNode *node = lookup_type_node_I (instance_type);
964 TypeNode *iface = lookup_type_node_I (iface_type);
967 GType *prerequisites;
971 if (!node || !node->is_instantiatable)
973 g_warning ("cannot add interfaces to invalid (non-instantiatable) type `%s'",
974 type_descriptive_name_I (instance_type));
977 if (!iface || !NODE_IS_IFACE (iface))
979 g_warning ("cannot add invalid (non-interface) type `%s' to type `%s'",
980 type_descriptive_name_I (iface_type),
984 tnode = lookup_type_node_I (NODE_PARENT_TYPE (iface));
985 if (NODE_PARENT_TYPE (tnode) && !type_lookup_iface_entry_L (node, tnode))
987 /* 2001/7/31:timj: erk, i guess this warning is junk as interface derivation is flat */
988 g_warning ("cannot add sub-interface `%s' to type `%s' which does not conform to super-interface `%s'",
994 /* allow overriding of interface type introduced for parent type */
995 entry = type_lookup_iface_entry_L (node, iface);
996 if (entry && entry->vtable == NULL && !type_iface_peek_holder_L (iface, NODE_TYPE (node)))
998 /* ok, we do conform to this interface already, but the interface vtable was not
999 * yet intialized, and we just conform to the interface because it got added to
1000 * one of our parents. so we allow overriding of holder info here.
1004 /* check whether one of our children already conforms (or whether the interface
1005 * got added to this node already)
1007 tnode = find_conforming_child_type_L (node, iface); /* tnode is_a node */
1010 g_warning ("cannot add interface type `%s' to type `%s', since type `%s' already conforms to interface",
1016 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1017 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1019 tnode = lookup_type_node_I (prerequisites[i]);
1020 if (!type_node_is_a_L (node, tnode))
1022 g_warning ("cannot add interface type `%s' to type `%s' which does not conform to prerequisite `%s'",
1033 check_interface_info_I (TypeNode *iface,
1034 GType instance_type,
1035 const GInterfaceInfo *info)
1037 if ((info->interface_finalize || info->interface_data) && !info->interface_init)
1039 g_warning ("interface type `%s' for type `%s' comes without initializer",
1041 type_descriptive_name_I (instance_type));
1048 /* --- type info (type node data) --- */
1050 type_data_make_W (TypeNode *node,
1051 const GTypeInfo *info,
1052 const GTypeValueTable *value_table)
1055 GTypeValueTable *vtable = NULL;
1056 guint vtable_size = 0;
1058 g_assert (node->data == NULL && info != NULL);
1062 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1065 vtable = pnode->data->common.value_table;
1068 static const GTypeValueTable zero_vtable = { NULL, };
1070 value_table = &zero_vtable;
1075 /* need to setup vtable_size since we have to allocate it with data in one chunk */
1076 vtable_size = sizeof (GTypeValueTable);
1077 if (value_table->collect_format)
1078 vtable_size += strlen (value_table->collect_format);
1079 if (value_table->lcopy_format)
1080 vtable_size += strlen (value_table->lcopy_format);
1084 if (node->is_instantiatable) /* carefull, is_instantiatable is also is_classed */
1086 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1088 data = g_malloc0 (sizeof (InstanceData) + vtable_size);
1090 vtable = G_STRUCT_MEMBER_P (data, sizeof (InstanceData));
1091 data->instance.class_size = info->class_size;
1092 data->instance.class_init_base = info->base_init;
1093 data->instance.class_finalize_base = info->base_finalize;
1094 data->instance.class_init = info->class_init;
1095 data->instance.class_finalize = info->class_finalize;
1096 data->instance.class_data = info->class_data;
1097 data->instance.class = NULL;
1098 data->instance.init_state = UNINITIALIZED;
1099 data->instance.instance_size = info->instance_size;
1100 /* We'll set the final value for data->instance.private size
1101 * after the parent class has been initialized
1103 data->instance.private_size = 0;
1104 data->instance.class_private_size = 0;
1106 data->instance.class_private_size = pnode->data->instance.class_private_size;
1107 #ifdef DISABLE_MEM_POOLS
1108 data->instance.n_preallocs = 0;
1109 #else /* !DISABLE_MEM_POOLS */
1110 data->instance.n_preallocs = MIN (info->n_preallocs, 1024);
1111 #endif /* !DISABLE_MEM_POOLS */
1112 data->instance.instance_init = info->instance_init;
1114 else if (node->is_classed) /* only classed */
1116 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1118 data = g_malloc0 (sizeof (ClassData) + vtable_size);
1120 vtable = G_STRUCT_MEMBER_P (data, sizeof (ClassData));
1121 data->class.class_size = info->class_size;
1122 data->class.class_init_base = info->base_init;
1123 data->class.class_finalize_base = info->base_finalize;
1124 data->class.class_init = info->class_init;
1125 data->class.class_finalize = info->class_finalize;
1126 data->class.class_data = info->class_data;
1127 data->class.class = NULL;
1128 data->class.class_private_size = 0;
1130 data->class.class_private_size = pnode->data->class.class_private_size;
1131 data->class.init_state = UNINITIALIZED;
1133 else if (NODE_IS_IFACE (node))
1135 data = g_malloc0 (sizeof (IFaceData) + vtable_size);
1137 vtable = G_STRUCT_MEMBER_P (data, sizeof (IFaceData));
1138 data->iface.vtable_size = info->class_size;
1139 data->iface.vtable_init_base = info->base_init;
1140 data->iface.vtable_finalize_base = info->base_finalize;
1141 data->iface.dflt_init = info->class_init;
1142 data->iface.dflt_finalize = info->class_finalize;
1143 data->iface.dflt_data = info->class_data;
1144 data->iface.dflt_vtable = NULL;
1146 else if (NODE_IS_BOXED (node))
1148 data = g_malloc0 (sizeof (BoxedData) + vtable_size);
1150 vtable = G_STRUCT_MEMBER_P (data, sizeof (BoxedData));
1154 data = g_malloc0 (sizeof (CommonData) + vtable_size);
1156 vtable = G_STRUCT_MEMBER_P (data, sizeof (CommonData));
1165 /* we allocate the vtable and its strings together with the type data, so
1166 * children can take over their parent's vtable pointer, and we don't
1167 * need to worry freeing it or not when the child data is destroyed
1169 *vtable = *value_table;
1170 p = G_STRUCT_MEMBER_P (vtable, sizeof (*vtable));
1172 vtable->collect_format = p;
1173 if (value_table->collect_format)
1175 strcat (p, value_table->collect_format);
1176 p += strlen (value_table->collect_format);
1180 vtable->lcopy_format = p;
1181 if (value_table->lcopy_format)
1182 strcat (p, value_table->lcopy_format);
1184 node->data->common.value_table = vtable;
1185 node->mutatable_check_cache = (node->data->common.value_table->value_init != NULL &&
1186 !((G_TYPE_FLAG_VALUE_ABSTRACT | G_TYPE_FLAG_ABSTRACT) &
1187 GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))));
1189 g_assert (node->data->common.value_table != NULL); /* paranoid */
1191 g_atomic_int_set ((int *) &node->ref_count, 1);
1195 type_data_ref_Wm (TypeNode *node)
1199 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1201 GTypeValueTable tmp_value_table;
1203 g_assert (node->plugin != NULL);
1207 type_data_ref_Wm (pnode);
1209 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
1212 memset (&tmp_info, 0, sizeof (tmp_info));
1213 memset (&tmp_value_table, 0, sizeof (tmp_value_table));
1215 G_WRITE_UNLOCK (&type_rw_lock);
1216 g_type_plugin_use (node->plugin);
1217 g_type_plugin_complete_type_info (node->plugin, NODE_TYPE (node), &tmp_info, &tmp_value_table);
1218 G_WRITE_LOCK (&type_rw_lock);
1220 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
1222 check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (node), NODE_NAME (node), &tmp_info);
1223 type_data_make_W (node, &tmp_info,
1224 check_value_table_I (NODE_NAME (node),
1225 &tmp_value_table) ? &tmp_value_table : NULL);
1229 g_assert (NODE_REFCOUNT (node) > 0);
1231 g_atomic_int_inc ((int *) &node->ref_count);
1235 static inline gboolean
1236 type_data_ref_U (TypeNode *node)
1241 current = NODE_REFCOUNT (node);
1245 } while (!g_atomic_int_compare_and_exchange ((int *) &node->ref_count, current, current + 1));
1251 iface_node_has_available_offset_L (TypeNode *iface_node,
1257 offsets = G_ATOMIC_ARRAY_GET_LOCKED (&iface_node->_prot.offsets, guint8);
1258 if (offsets == NULL)
1261 if (G_ATOMIC_ARRAY_DATA_SIZE (offsets) <= offset)
1264 if (offsets[offset] == 0 ||
1265 offsets[offset] == for_index+1)
1272 find_free_iface_offset_L (IFaceEntries *entries)
1275 TypeNode *iface_node;
1280 n_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1285 for (i = 0; i < n_entries; i++)
1287 entry = &entries->entry[i];
1288 iface_node = lookup_type_node_I (entry->iface_type);
1290 if (!iface_node_has_available_offset_L (iface_node, offset, i))
1294 while (i != n_entries);
1300 iface_node_set_offset_L (TypeNode *iface_node,
1304 guint8 *offsets, *old_offsets;
1305 int new_size, old_size;
1308 old_offsets = G_ATOMIC_ARRAY_GET_LOCKED (&iface_node->_prot.offsets, guint8);
1309 if (old_offsets == NULL)
1313 old_size = G_ATOMIC_ARRAY_DATA_SIZE (old_offsets);
1314 if (offset < old_size &&
1315 old_offsets[offset] == index + 1)
1316 return; /* Already set to this index, return */
1318 new_size = MAX (old_size, offset + 1);
1320 offsets = _g_atomic_array_copy (&iface_node->_prot.offsets,
1321 0, new_size - old_size);
1323 /* Mark new area as unused */
1324 for (i = old_size; i < new_size; i++)
1327 offsets[offset] = index + 1;
1329 _g_atomic_array_update (&iface_node->_prot.offsets, offsets);
1333 type_node_add_iface_entry_W (TypeNode *node,
1335 IFaceEntry *parent_entry)
1337 IFaceEntries *entries;
1339 TypeNode *iface_node;
1343 g_assert (node->is_instantiatable);
1345 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
1346 if (entries != NULL)
1348 num_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1350 g_assert (num_entries < MAX_N_INTERFACES);
1352 for (i = 0; i < num_entries; i++)
1354 entry = &entries->entry[i];
1355 if (entry->iface_type == iface_type)
1357 /* this can happen in two cases:
1358 * - our parent type already conformed to iface_type and node
1359 * got its own holder info. here, our children already have
1360 * entries and NULL vtables, since this will only work for
1361 * uninitialized classes.
1362 * - an interface type is added to an ancestor after it was
1363 * added to a child type.
1366 g_assert (entry->vtable == NULL && entry->init_state == UNINITIALIZED);
1369 /* sick, interface is added to ancestor *after* child type;
1370 * nothing todo, the entry and our children were already setup correctly
1378 entries = _g_atomic_array_copy (CLASSED_NODE_IFACES_ENTRIES (node),
1379 IFACE_ENTRIES_HEADER_SIZE,
1380 sizeof (IFaceEntry));
1381 num_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1382 i = num_entries - 1;
1384 entries->offset_index = 0;
1385 entries->entry[i].iface_type = iface_type;
1386 entries->entry[i].vtable = NULL;
1387 entries->entry[i].init_state = UNINITIALIZED;
1391 if (node->data && node->data->class.init_state >= BASE_IFACE_INIT)
1393 entries->entry[i].init_state = INITIALIZED;
1394 entries->entry[i].vtable = parent_entry->vtable;
1398 /* Update offsets in iface */
1399 iface_node = lookup_type_node_I (iface_type);
1401 if (iface_node_has_available_offset_L (iface_node,
1402 entries->offset_index,
1405 iface_node_set_offset_L (iface_node,
1406 entries->offset_index, i);
1410 entries->offset_index =
1411 find_free_iface_offset_L (entries);
1412 for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (entries); j++)
1414 entry = &entries->entry[j];
1416 lookup_type_node_I (entry->iface_type);
1417 iface_node_set_offset_L (iface_node,
1418 entries->offset_index, j);
1422 _g_atomic_array_update (CLASSED_NODE_IFACES_ENTRIES (node), entries);
1426 for (i = 0; i < node->n_children; i++)
1427 type_node_add_iface_entry_W (lookup_type_node_I (node->children[i]), iface_type, &entries->entry[i]);
1432 type_add_interface_Wm (TypeNode *node,
1434 const GInterfaceInfo *info,
1435 GTypePlugin *plugin)
1437 IFaceHolder *iholder = g_new0 (IFaceHolder, 1);
1441 g_assert (node->is_instantiatable && NODE_IS_IFACE (iface) && ((info && !plugin) || (!info && plugin)));
1443 iholder->next = iface_node_get_holders_L (iface);
1444 iface_node_set_holders_W (iface, iholder);
1445 iholder->instance_type = NODE_TYPE (node);
1446 iholder->info = info ? g_memdup (info, sizeof (*info)) : NULL;
1447 iholder->plugin = plugin;
1449 /* create an iface entry for this type */
1450 type_node_add_iface_entry_W (node, NODE_TYPE (iface), NULL);
1452 /* if the class is already (partly) initialized, we may need to base
1453 * initalize and/or initialize the new interface.
1457 InitState class_state = node->data->class.init_state;
1459 if (class_state >= BASE_IFACE_INIT)
1460 type_iface_vtable_base_init_Wm (iface, node);
1462 if (class_state >= IFACE_INIT)
1463 type_iface_vtable_iface_init_Wm (iface, node);
1466 /* create iface entries for children of this type */
1467 entry = type_lookup_iface_entry_L (node, iface);
1468 for (i = 0; i < node->n_children; i++)
1469 type_node_add_iface_entry_W (lookup_type_node_I (node->children[i]), NODE_TYPE (iface), entry);
1473 type_iface_add_prerequisite_W (TypeNode *iface,
1474 TypeNode *prerequisite_node)
1476 GType prerequisite_type = NODE_TYPE (prerequisite_node);
1477 GType *prerequisites, *dependants;
1478 guint n_dependants, i;
1480 g_assert (NODE_IS_IFACE (iface) &&
1481 IFACE_NODE_N_PREREQUISITES (iface) < MAX_N_PREREQUISITES &&
1482 (prerequisite_node->is_instantiatable || NODE_IS_IFACE (prerequisite_node)));
1484 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1485 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1486 if (prerequisites[i] == prerequisite_type)
1487 return; /* we already have that prerequisiste */
1488 else if (prerequisites[i] > prerequisite_type)
1490 IFACE_NODE_N_PREREQUISITES (iface) += 1;
1491 IFACE_NODE_PREREQUISITES (iface) = g_renew (GType,
1492 IFACE_NODE_PREREQUISITES (iface),
1493 IFACE_NODE_N_PREREQUISITES (iface));
1494 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1495 g_memmove (prerequisites + i + 1, prerequisites + i,
1496 sizeof (prerequisites[0]) * (IFACE_NODE_N_PREREQUISITES (iface) - i - 1));
1497 prerequisites[i] = prerequisite_type;
1499 /* we want to get notified when prerequisites get added to prerequisite_node */
1500 if (NODE_IS_IFACE (prerequisite_node))
1502 dependants = iface_node_get_dependants_array_L (prerequisite_node);
1503 n_dependants = dependants ? dependants[0] : 0;
1505 dependants = g_renew (GType, dependants, n_dependants + 1);
1506 dependants[n_dependants] = NODE_TYPE (iface);
1507 dependants[0] = n_dependants;
1508 iface_node_set_dependants_array_W (prerequisite_node, dependants);
1511 /* we need to notify all dependants */
1512 dependants = iface_node_get_dependants_array_L (iface);
1513 n_dependants = dependants ? dependants[0] : 0;
1514 for (i = 1; i <= n_dependants; i++)
1515 type_iface_add_prerequisite_W (lookup_type_node_I (dependants[i]), prerequisite_node);
1519 * g_type_interface_add_prerequisite:
1520 * @interface_type: #GType value of an interface type.
1521 * @prerequisite_type: #GType value of an interface or instantiatable type.
1523 * Adds @prerequisite_type to the list of prerequisites of @interface_type.
1524 * This means that any type implementing @interface_type must also implement
1525 * @prerequisite_type. Prerequisites can be thought of as an alternative to
1526 * interface derivation (which GType doesn't support). An interface can have
1527 * at most one instantiatable prerequisite type.
1530 g_type_interface_add_prerequisite (GType interface_type,
1531 GType prerequisite_type)
1533 TypeNode *iface, *prerequisite_node;
1534 IFaceHolder *holders;
1536 g_return_if_fail (G_TYPE_IS_INTERFACE (interface_type)); /* G_TYPE_IS_INTERFACE() is an external call: _U */
1537 g_return_if_fail (!g_type_is_a (interface_type, prerequisite_type));
1538 g_return_if_fail (!g_type_is_a (prerequisite_type, interface_type));
1540 iface = lookup_type_node_I (interface_type);
1541 prerequisite_node = lookup_type_node_I (prerequisite_type);
1542 if (!iface || !prerequisite_node || !NODE_IS_IFACE (iface))
1544 g_warning ("interface type `%s' or prerequisite type `%s' invalid",
1545 type_descriptive_name_I (interface_type),
1546 type_descriptive_name_I (prerequisite_type));
1549 G_WRITE_LOCK (&type_rw_lock);
1550 holders = iface_node_get_holders_L (iface);
1553 G_WRITE_UNLOCK (&type_rw_lock);
1554 g_warning ("unable to add prerequisite `%s' to interface `%s' which is already in use for `%s'",
1555 type_descriptive_name_I (prerequisite_type),
1556 type_descriptive_name_I (interface_type),
1557 type_descriptive_name_I (holders->instance_type));
1560 if (prerequisite_node->is_instantiatable)
1564 /* can have at most one publically installable instantiatable prerequisite */
1565 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1567 TypeNode *prnode = lookup_type_node_I (IFACE_NODE_PREREQUISITES (iface)[i]);
1569 if (prnode->is_instantiatable)
1571 G_WRITE_UNLOCK (&type_rw_lock);
1572 g_warning ("adding prerequisite `%s' to interface `%s' conflicts with existing prerequisite `%s'",
1573 type_descriptive_name_I (prerequisite_type),
1574 type_descriptive_name_I (interface_type),
1575 type_descriptive_name_I (NODE_TYPE (prnode)));
1580 for (i = 0; i < prerequisite_node->n_supers + 1; i++)
1581 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisite_node->supers[i]));
1582 G_WRITE_UNLOCK (&type_rw_lock);
1584 else if (NODE_IS_IFACE (prerequisite_node))
1586 GType *prerequisites;
1589 prerequisites = IFACE_NODE_PREREQUISITES (prerequisite_node);
1590 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (prerequisite_node); i++)
1591 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisites[i]));
1592 type_iface_add_prerequisite_W (iface, prerequisite_node);
1593 G_WRITE_UNLOCK (&type_rw_lock);
1597 G_WRITE_UNLOCK (&type_rw_lock);
1598 g_warning ("prerequisite `%s' for interface `%s' is neither instantiatable nor interface",
1599 type_descriptive_name_I (prerequisite_type),
1600 type_descriptive_name_I (interface_type));
1605 * g_type_interface_prerequisites:
1606 * @interface_type: an interface type
1607 * @n_prerequisites: location to return the number of prerequisites, or %NULL
1609 * Returns the prerequisites of an interfaces type.
1613 * Returns: a newly-allocated zero-terminated array of #GType containing
1614 * the prerequisites of @interface_type
1617 g_type_interface_prerequisites (GType interface_type,
1618 guint *n_prerequisites)
1622 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL);
1624 iface = lookup_type_node_I (interface_type);
1628 TypeNode *inode = NULL;
1631 G_READ_LOCK (&type_rw_lock);
1632 types = g_new0 (GType, IFACE_NODE_N_PREREQUISITES (iface) + 1);
1633 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1635 GType prerequisite = IFACE_NODE_PREREQUISITES (iface)[i];
1636 TypeNode *node = lookup_type_node_I (prerequisite);
1637 if (node->is_instantiatable)
1639 if (!inode || type_node_is_a_L (node, inode))
1643 types[n++] = NODE_TYPE (node);
1646 types[n++] = NODE_TYPE (inode);
1648 if (n_prerequisites)
1649 *n_prerequisites = n;
1650 G_READ_UNLOCK (&type_rw_lock);
1656 if (n_prerequisites)
1657 *n_prerequisites = 0;
1665 type_iface_peek_holder_L (TypeNode *iface,
1666 GType instance_type)
1668 IFaceHolder *iholder;
1670 g_assert (NODE_IS_IFACE (iface));
1672 iholder = iface_node_get_holders_L (iface);
1673 while (iholder && iholder->instance_type != instance_type)
1674 iholder = iholder->next;
1679 type_iface_retrieve_holder_info_Wm (TypeNode *iface,
1680 GType instance_type,
1683 IFaceHolder *iholder = type_iface_peek_holder_L (iface, instance_type);
1685 if (iholder && !iholder->info && need_info)
1687 GInterfaceInfo tmp_info;
1689 g_assert (iholder->plugin != NULL);
1691 type_data_ref_Wm (iface);
1693 INVALID_RECURSION ("g_type_plugin_*", iface->plugin, NODE_NAME (iface));
1695 memset (&tmp_info, 0, sizeof (tmp_info));
1697 G_WRITE_UNLOCK (&type_rw_lock);
1698 g_type_plugin_use (iholder->plugin);
1699 g_type_plugin_complete_interface_info (iholder->plugin, instance_type, NODE_TYPE (iface), &tmp_info);
1700 G_WRITE_LOCK (&type_rw_lock);
1702 INVALID_RECURSION ("g_type_plugin_*", iholder->plugin, NODE_NAME (iface));
1704 check_interface_info_I (iface, instance_type, &tmp_info);
1705 iholder->info = g_memdup (&tmp_info, sizeof (tmp_info));
1708 return iholder; /* we don't modify write lock upon returning NULL */
1712 type_iface_blow_holder_info_Wm (TypeNode *iface,
1713 GType instance_type)
1715 IFaceHolder *iholder = iface_node_get_holders_L (iface);
1717 g_assert (NODE_IS_IFACE (iface));
1719 while (iholder->instance_type != instance_type)
1720 iholder = iholder->next;
1722 if (iholder->info && iholder->plugin)
1724 g_free (iholder->info);
1725 iholder->info = NULL;
1727 G_WRITE_UNLOCK (&type_rw_lock);
1728 g_type_plugin_unuse (iholder->plugin);
1729 type_data_unref_U (iface, FALSE);
1730 G_WRITE_LOCK (&type_rw_lock);
1734 /* Assumes type's class already exists
1736 static inline size_t
1737 type_total_instance_size_I (TypeNode *node)
1739 gsize total_instance_size;
1741 total_instance_size = node->data->instance.instance_size;
1742 if (node->data->instance.private_size != 0)
1743 total_instance_size = ALIGN_STRUCT (total_instance_size) + node->data->instance.private_size;
1745 return total_instance_size;
1748 /* --- type structure creation/destruction --- */
1752 } InstanceRealClass;
1755 instance_real_class_cmp (gconstpointer p1,
1758 const InstanceRealClass *irc1 = p1;
1759 const InstanceRealClass *irc2 = p2;
1760 guint8 *i1 = irc1->instance;
1761 guint8 *i2 = irc2->instance;
1762 return G_BSEARCH_ARRAY_CMP (i1, i2);
1765 G_LOCK_DEFINE_STATIC (instance_real_class);
1766 static GBSearchArray *instance_real_class_bsa = NULL;
1767 static GBSearchConfig instance_real_class_bconfig = {
1768 sizeof (InstanceRealClass),
1769 instance_real_class_cmp,
1774 instance_real_class_set (gpointer instance,
1777 InstanceRealClass key;
1778 key.instance = instance;
1780 G_LOCK (instance_real_class);
1781 if (!instance_real_class_bsa)
1782 instance_real_class_bsa = g_bsearch_array_create (&instance_real_class_bconfig);
1783 instance_real_class_bsa = g_bsearch_array_replace (instance_real_class_bsa, &instance_real_class_bconfig, &key);
1784 G_UNLOCK (instance_real_class);
1788 instance_real_class_remove (gpointer instance)
1790 InstanceRealClass key, *node;
1792 key.instance = instance;
1793 G_LOCK (instance_real_class);
1794 node = g_bsearch_array_lookup (instance_real_class_bsa, &instance_real_class_bconfig, &key);
1795 index = g_bsearch_array_get_index (instance_real_class_bsa, &instance_real_class_bconfig, node);
1796 instance_real_class_bsa = g_bsearch_array_remove (instance_real_class_bsa, &instance_real_class_bconfig, index);
1797 if (!g_bsearch_array_get_n_nodes (instance_real_class_bsa))
1799 g_bsearch_array_free (instance_real_class_bsa, &instance_real_class_bconfig);
1800 instance_real_class_bsa = NULL;
1802 G_UNLOCK (instance_real_class);
1805 static inline GTypeClass*
1806 instance_real_class_get (gpointer instance)
1808 InstanceRealClass key, *node;
1810 key.instance = instance;
1811 G_LOCK (instance_real_class);
1812 node = instance_real_class_bsa ? g_bsearch_array_lookup (instance_real_class_bsa, &instance_real_class_bconfig, &key) : NULL;
1813 class = node ? node->class : NULL;
1814 G_UNLOCK (instance_real_class);
1819 * g_type_create_instance:
1820 * @type: An instantiatable type to create an instance for.
1822 * Creates and initializes an instance of @type if @type is valid and
1823 * can be instantiated. The type system only performs basic allocation
1824 * and structure setups for instances: actual instance creation should
1825 * happen through functions supplied by the type's fundamental type
1826 * implementation. So use of g_type_create_instance() is reserved for
1827 * implementators of fundamental types only. E.g. instances of the
1828 * #GObject hierarchy should be created via g_object_new() and
1829 * <emphasis>never</emphasis> directly through
1830 * g_type_create_instance() which doesn't handle things like singleton
1831 * objects or object construction. Note: Do <emphasis>not</emphasis>
1832 * use this function, unless you're implementing a fundamental
1833 * type. Also language bindings should <emphasis>not</emphasis> use
1834 * this function but g_object_new() instead.
1836 * Returns: An allocated and initialized instance, subject to further
1837 * treatment by the fundamental type implementation.
1840 g_type_create_instance (GType type)
1843 GTypeInstance *instance;
1845 guint i, total_size;
1847 node = lookup_type_node_I (type);
1848 if (!node || !node->is_instantiatable)
1850 g_warning ("cannot create new instance of invalid (non-instantiatable) type `%s'",
1851 type_descriptive_name_I (type));
1854 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1855 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (type))
1857 g_warning ("cannot create instance of abstract (non-instantiatable) type `%s'",
1858 type_descriptive_name_I (type));
1862 class = g_type_class_ref (type);
1863 total_size = type_total_instance_size_I (node);
1865 instance = g_slice_alloc0 (total_size);
1867 if (node->data->instance.private_size)
1868 instance_real_class_set (instance, class);
1869 for (i = node->n_supers; i > 0; i--)
1873 pnode = lookup_type_node_I (node->supers[i]);
1874 if (pnode->data->instance.instance_init)
1876 instance->g_class = pnode->data->instance.class;
1877 pnode->data->instance.instance_init (instance, class);
1880 if (node->data->instance.private_size)
1881 instance_real_class_remove (instance);
1883 instance->g_class = class;
1884 if (node->data->instance.instance_init)
1885 node->data->instance.instance_init (instance, class);
1891 * g_type_free_instance:
1892 * @instance: an instance of a type.
1894 * Frees an instance of a type, returning it to the instance pool for
1895 * the type, if there is one.
1897 * Like g_type_create_instance(), this function is reserved for
1898 * implementors of fundamental types.
1901 g_type_free_instance (GTypeInstance *instance)
1906 g_return_if_fail (instance != NULL && instance->g_class != NULL);
1908 class = instance->g_class;
1909 node = lookup_type_node_I (class->g_type);
1910 if (!node || !node->is_instantiatable || !node->data || node->data->class.class != (gpointer) class)
1912 g_warning ("cannot free instance of invalid (non-instantiatable) type `%s'",
1913 type_descriptive_name_I (class->g_type));
1916 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1917 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (NODE_TYPE (node)))
1919 g_warning ("cannot free instance of abstract (non-instantiatable) type `%s'",
1924 instance->g_class = NULL;
1925 #ifdef G_ENABLE_DEBUG
1926 memset (instance, 0xaa, type_total_instance_size_I (node));
1928 g_slice_free1 (type_total_instance_size_I (node), instance);
1930 g_type_class_unref (class);
1934 type_iface_ensure_dflt_vtable_Wm (TypeNode *iface)
1936 g_assert (iface->data);
1938 if (!iface->data->iface.dflt_vtable)
1940 GTypeInterface *vtable = g_malloc0 (iface->data->iface.vtable_size);
1941 iface->data->iface.dflt_vtable = vtable;
1942 vtable->g_type = NODE_TYPE (iface);
1943 vtable->g_instance_type = 0;
1944 if (iface->data->iface.vtable_init_base ||
1945 iface->data->iface.dflt_init)
1947 G_WRITE_UNLOCK (&type_rw_lock);
1948 if (iface->data->iface.vtable_init_base)
1949 iface->data->iface.vtable_init_base (vtable);
1950 if (iface->data->iface.dflt_init)
1951 iface->data->iface.dflt_init (vtable, (gpointer) iface->data->iface.dflt_data);
1952 G_WRITE_LOCK (&type_rw_lock);
1958 /* This is called to allocate and do the first part of initializing
1959 * the interface vtable; type_iface_vtable_iface_init_Wm() does the remainder.
1961 * A FALSE return indicates that we didn't find an init function for
1962 * this type/iface pair, so the vtable from the parent type should
1963 * be used. Note that the write lock is not modified upon a FALSE
1967 type_iface_vtable_base_init_Wm (TypeNode *iface,
1971 IFaceHolder *iholder;
1972 GTypeInterface *vtable = NULL;
1975 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
1976 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), TRUE);
1978 return FALSE; /* we don't modify write lock upon FALSE */
1980 type_iface_ensure_dflt_vtable_Wm (iface);
1982 entry = type_lookup_iface_entry_L (node, iface);
1984 g_assert (iface->data && entry && entry->vtable == NULL && iholder && iholder->info);
1986 entry->init_state = IFACE_INIT;
1988 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1989 if (pnode) /* want to copy over parent iface contents */
1991 IFaceEntry *pentry = type_lookup_iface_entry_L (pnode, iface);
1994 vtable = g_memdup (pentry->vtable, iface->data->iface.vtable_size);
1997 vtable = g_memdup (iface->data->iface.dflt_vtable, iface->data->iface.vtable_size);
1998 entry->vtable = vtable;
1999 vtable->g_type = NODE_TYPE (iface);
2000 vtable->g_instance_type = NODE_TYPE (node);
2002 if (iface->data->iface.vtable_init_base)
2004 G_WRITE_UNLOCK (&type_rw_lock);
2005 iface->data->iface.vtable_init_base (vtable);
2006 G_WRITE_LOCK (&type_rw_lock);
2008 return TRUE; /* initialized the vtable */
2011 /* Finishes what type_iface_vtable_base_init_Wm started by
2012 * calling the interface init function.
2013 * this function may only be called for types with their
2014 * own interface holder info, i.e. types for which
2015 * g_type_add_interface*() was called and not children thereof.
2018 type_iface_vtable_iface_init_Wm (TypeNode *iface,
2021 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
2022 IFaceHolder *iholder = type_iface_peek_holder_L (iface, NODE_TYPE (node));
2023 GTypeInterface *vtable = NULL;
2026 /* iholder->info should have been filled in by type_iface_vtable_base_init_Wm() */
2027 g_assert (iface->data && entry && iholder && iholder->info);
2028 g_assert (entry->init_state == IFACE_INIT); /* assert prior base_init() */
2030 entry->init_state = INITIALIZED;
2032 vtable = entry->vtable;
2034 if (iholder->info->interface_init)
2036 G_WRITE_UNLOCK (&type_rw_lock);
2037 if (iholder->info->interface_init)
2038 iholder->info->interface_init (vtable, iholder->info->interface_data);
2039 G_WRITE_LOCK (&type_rw_lock);
2042 for (i = 0; i < static_n_iface_check_funcs; i++)
2044 GTypeInterfaceCheckFunc check_func = static_iface_check_funcs[i].check_func;
2045 gpointer check_data = static_iface_check_funcs[i].check_data;
2047 G_WRITE_UNLOCK (&type_rw_lock);
2048 check_func (check_data, (gpointer)vtable);
2049 G_WRITE_LOCK (&type_rw_lock);
2054 type_iface_vtable_finalize_Wm (TypeNode *iface,
2056 GTypeInterface *vtable)
2058 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
2059 IFaceHolder *iholder;
2061 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
2062 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), FALSE);
2064 return FALSE; /* we don't modify write lock upon FALSE */
2066 g_assert (entry && entry->vtable == vtable && iholder->info);
2068 entry->vtable = NULL;
2069 entry->init_state = UNINITIALIZED;
2070 if (iholder->info->interface_finalize || iface->data->iface.vtable_finalize_base)
2072 G_WRITE_UNLOCK (&type_rw_lock);
2073 if (iholder->info->interface_finalize)
2074 iholder->info->interface_finalize (vtable, iholder->info->interface_data);
2075 if (iface->data->iface.vtable_finalize_base)
2076 iface->data->iface.vtable_finalize_base (vtable);
2077 G_WRITE_LOCK (&type_rw_lock);
2080 vtable->g_instance_type = 0;
2083 type_iface_blow_holder_info_Wm (iface, NODE_TYPE (node));
2085 return TRUE; /* write lock modified */
2089 type_class_init_Wm (TypeNode *node,
2092 GSList *slist, *init_slist = NULL;
2094 IFaceEntries *entries;
2096 TypeNode *bnode, *pnode;
2099 /* Accessing data->class will work for instantiable types
2100 * too because ClassData is a subset of InstanceData
2102 g_assert (node->is_classed && node->data &&
2103 node->data->class.class_size &&
2104 !node->data->class.class &&
2105 node->data->class.init_state == UNINITIALIZED);
2106 if (node->data->class.class_private_size)
2107 class = g_malloc0 (ALIGN_STRUCT (node->data->class.class_size) + node->data->class.class_private_size);
2109 class = g_malloc0 (node->data->class.class_size);
2110 node->data->class.class = class;
2111 g_atomic_int_set (&node->data->class.init_state, BASE_CLASS_INIT);
2115 TypeNode *pnode = lookup_type_node_I (pclass->g_type);
2117 memcpy (class, pclass, pnode->data->class.class_size);
2118 memcpy (G_STRUCT_MEMBER_P (class, ALIGN_STRUCT (node->data->class.class_size)), G_STRUCT_MEMBER_P (pclass, ALIGN_STRUCT (pnode->data->class.class_size)), pnode->data->class.class_private_size);
2120 if (node->is_instantiatable)
2122 /* We need to initialize the private_size here rather than in
2123 * type_data_make_W() since the class init for the parent
2124 * class may have changed pnode->data->instance.private_size.
2126 node->data->instance.private_size = pnode->data->instance.private_size;
2129 class->g_type = NODE_TYPE (node);
2131 G_WRITE_UNLOCK (&type_rw_lock);
2133 /* stack all base class initialization functions, so we
2134 * call them in ascending order.
2136 for (bnode = node; bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
2137 if (bnode->data->class.class_init_base)
2138 init_slist = g_slist_prepend (init_slist, (gpointer) bnode->data->class.class_init_base);
2139 for (slist = init_slist; slist; slist = slist->next)
2141 GBaseInitFunc class_init_base = (GBaseInitFunc) slist->data;
2143 class_init_base (class);
2145 g_slist_free (init_slist);
2147 G_WRITE_LOCK (&type_rw_lock);
2149 g_atomic_int_set (&node->data->class.init_state, BASE_IFACE_INIT);
2151 /* Before we initialize the class, base initialize all interfaces, either
2152 * from parent, or through our holder info
2154 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
2157 while ((entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node)) != NULL &&
2158 i < IFACE_ENTRIES_N_ENTRIES (entries))
2160 entry = &entries->entry[i];
2161 while (i < IFACE_ENTRIES_N_ENTRIES (entries) &&
2162 entry->init_state == IFACE_INIT)
2168 if (i == IFACE_ENTRIES_N_ENTRIES (entries))
2171 if (!type_iface_vtable_base_init_Wm (lookup_type_node_I (entry->iface_type), node))
2174 IFaceEntries *pentries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (pnode);
2176 /* need to get this interface from parent, type_iface_vtable_base_init_Wm()
2177 * doesn't modify write lock upon FALSE, so entry is still valid;
2179 g_assert (pnode != NULL);
2182 for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (pentries); j++)
2184 IFaceEntry *pentry = &pentries->entry[j];
2186 if (pentry->iface_type == entry->iface_type)
2188 entry->vtable = pentry->vtable;
2189 entry->init_state = INITIALIZED;
2193 g_assert (entry->vtable != NULL);
2196 /* If the write lock was released, additional interface entries might
2197 * have been inserted into CLASSED_NODE_IFACES_ENTRIES (node); they'll
2198 * be base-initialized when inserted, so we don't have to worry that
2199 * we might miss them. Uninitialized entries can only be moved higher
2200 * when new ones are inserted.
2205 g_atomic_int_set (&node->data->class.init_state, CLASS_INIT);
2207 G_WRITE_UNLOCK (&type_rw_lock);
2209 if (node->data->class.class_init)
2210 node->data->class.class_init (class, (gpointer) node->data->class.class_data);
2212 G_WRITE_LOCK (&type_rw_lock);
2214 g_atomic_int_set (&node->data->class.init_state, IFACE_INIT);
2216 /* finish initializing the interfaces through our holder info.
2217 * inherited interfaces are already init_state == INITIALIZED, because
2218 * they either got setup in the above base_init loop, or during
2219 * class_init from within type_add_interface_Wm() for this or
2220 * an anchestor type.
2223 while ((entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node)) != NULL)
2225 entry = &entries->entry[i];
2226 while (i < IFACE_ENTRIES_N_ENTRIES (entries) &&
2227 entry->init_state == INITIALIZED)
2233 if (i == IFACE_ENTRIES_N_ENTRIES (entries))
2236 type_iface_vtable_iface_init_Wm (lookup_type_node_I (entry->iface_type), node);
2238 /* As in the loop above, additional initialized entries might be inserted
2239 * if the write lock is released, but that's harmless because the entries
2240 * we need to initialize only move higher in the list.
2245 g_atomic_int_set (&node->data->class.init_state, INITIALIZED);
2249 type_data_finalize_class_ifaces_Wm (TypeNode *node)
2252 IFaceEntries *entries;
2254 g_assert (node->is_instantiatable && node->data && node->data->class.class && NODE_REFCOUNT (node) == 0);
2257 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
2258 for (i = 0; entries != NULL && i < IFACE_ENTRIES_N_ENTRIES (entries); i++)
2260 IFaceEntry *entry = &entries->entry[i];
2263 if (type_iface_vtable_finalize_Wm (lookup_type_node_I (entry->iface_type), node, entry->vtable))
2265 /* refetch entries, IFACES_ENTRIES might be modified */
2270 /* type_iface_vtable_finalize_Wm() doesn't modify write lock upon FALSE,
2271 * iface vtable came from parent
2273 entry->vtable = NULL;
2274 entry->init_state = UNINITIALIZED;
2281 type_data_finalize_class_U (TypeNode *node,
2284 GTypeClass *class = cdata->class;
2287 g_assert (cdata->class && NODE_REFCOUNT (node) == 0);
2289 if (cdata->class_finalize)
2290 cdata->class_finalize (class, (gpointer) cdata->class_data);
2292 /* call all base class destruction functions in descending order
2294 if (cdata->class_finalize_base)
2295 cdata->class_finalize_base (class);
2296 for (bnode = lookup_type_node_I (NODE_PARENT_TYPE (node)); bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
2297 if (bnode->data->class.class_finalize_base)
2298 bnode->data->class.class_finalize_base (class);
2300 g_free (cdata->class);
2304 type_data_last_unref_Wm (TypeNode *node,
2307 g_return_if_fail (node != NULL && node->plugin != NULL);
2309 if (!node->data || NODE_REFCOUNT (node) == 0)
2311 g_warning ("cannot drop last reference to unreferenced type `%s'",
2316 /* call class cache hooks */
2317 if (node->is_classed && node->data && node->data->class.class && static_n_class_cache_funcs && !uncached)
2321 G_WRITE_UNLOCK (&type_rw_lock);
2322 G_READ_LOCK (&type_rw_lock);
2323 for (i = 0; i < static_n_class_cache_funcs; i++)
2325 GTypeClassCacheFunc cache_func = static_class_cache_funcs[i].cache_func;
2326 gpointer cache_data = static_class_cache_funcs[i].cache_data;
2327 gboolean need_break;
2329 G_READ_UNLOCK (&type_rw_lock);
2330 need_break = cache_func (cache_data, node->data->class.class);
2331 G_READ_LOCK (&type_rw_lock);
2332 if (!node->data || NODE_REFCOUNT (node) == 0)
2333 INVALID_RECURSION ("GType class cache function ", cache_func, NODE_NAME (node));
2337 G_READ_UNLOCK (&type_rw_lock);
2338 G_WRITE_LOCK (&type_rw_lock);
2341 /* may have been re-referenced meanwhile */
2342 if (g_atomic_int_dec_and_test ((int *) &node->ref_count))
2344 GType ptype = NODE_PARENT_TYPE (node);
2347 if (node->is_instantiatable)
2349 /* destroy node->data->instance.mem_chunk */
2353 if (node->is_classed && tdata->class.class)
2355 if (CLASSED_NODE_IFACES_ENTRIES_LOCKED (node) != NULL)
2356 type_data_finalize_class_ifaces_Wm (node);
2357 node->mutatable_check_cache = FALSE;
2359 G_WRITE_UNLOCK (&type_rw_lock);
2360 type_data_finalize_class_U (node, &tdata->class);
2361 G_WRITE_LOCK (&type_rw_lock);
2363 else if (NODE_IS_IFACE (node) && tdata->iface.dflt_vtable)
2365 node->mutatable_check_cache = FALSE;
2367 if (tdata->iface.dflt_finalize || tdata->iface.vtable_finalize_base)
2369 G_WRITE_UNLOCK (&type_rw_lock);
2370 if (tdata->iface.dflt_finalize)
2371 tdata->iface.dflt_finalize (tdata->iface.dflt_vtable, (gpointer) tdata->iface.dflt_data);
2372 if (tdata->iface.vtable_finalize_base)
2373 tdata->iface.vtable_finalize_base (tdata->iface.dflt_vtable);
2374 G_WRITE_LOCK (&type_rw_lock);
2376 g_free (tdata->iface.dflt_vtable);
2380 node->mutatable_check_cache = FALSE;
2384 /* freeing tdata->common.value_table and its contents is taken care of
2385 * by allocating it in one chunk with tdata
2389 G_WRITE_UNLOCK (&type_rw_lock);
2390 g_type_plugin_unuse (node->plugin);
2392 type_data_unref_U (lookup_type_node_I (ptype), FALSE);
2393 G_WRITE_LOCK (&type_rw_lock);
2398 type_data_unref_U (TypeNode *node,
2404 current = NODE_REFCOUNT (node);
2410 g_warning ("static type `%s' unreferenced too often",
2415 g_assert (current > 0);
2417 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2418 G_WRITE_LOCK (&type_rw_lock);
2419 type_data_last_unref_Wm (node, uncached);
2420 G_WRITE_UNLOCK (&type_rw_lock);
2421 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2424 } while (!g_atomic_int_compare_and_exchange ((int *) &node->ref_count, current, current - 1));
2428 * g_type_add_class_cache_func:
2429 * @cache_data: data to be passed to @cache_func
2430 * @cache_func: a #GTypeClassCacheFunc
2432 * Adds a #GTypeClassCacheFunc to be called before the reference count of a
2433 * class goes from one to zero. This can be used to prevent premature class
2434 * destruction. All installed #GTypeClassCacheFunc functions will be chained
2435 * until one of them returns %TRUE. The functions have to check the class id
2436 * passed in to figure whether they actually want to cache the class of this
2437 * type, since all classes are routed through the same #GTypeClassCacheFunc
2441 g_type_add_class_cache_func (gpointer cache_data,
2442 GTypeClassCacheFunc cache_func)
2446 g_return_if_fail (cache_func != NULL);
2448 G_WRITE_LOCK (&type_rw_lock);
2449 i = static_n_class_cache_funcs++;
2450 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
2451 static_class_cache_funcs[i].cache_data = cache_data;
2452 static_class_cache_funcs[i].cache_func = cache_func;
2453 G_WRITE_UNLOCK (&type_rw_lock);
2457 * g_type_remove_class_cache_func:
2458 * @cache_data: data that was given when adding @cache_func
2459 * @cache_func: a #GTypeClassCacheFunc
2461 * Removes a previously installed #GTypeClassCacheFunc. The cache
2462 * maintained by @cache_func has to be empty when calling
2463 * g_type_remove_class_cache_func() to avoid leaks.
2466 g_type_remove_class_cache_func (gpointer cache_data,
2467 GTypeClassCacheFunc cache_func)
2469 gboolean found_it = FALSE;
2472 g_return_if_fail (cache_func != NULL);
2474 G_WRITE_LOCK (&type_rw_lock);
2475 for (i = 0; i < static_n_class_cache_funcs; i++)
2476 if (static_class_cache_funcs[i].cache_data == cache_data &&
2477 static_class_cache_funcs[i].cache_func == cache_func)
2479 static_n_class_cache_funcs--;
2480 g_memmove (static_class_cache_funcs + i,
2481 static_class_cache_funcs + i + 1,
2482 sizeof (static_class_cache_funcs[0]) * (static_n_class_cache_funcs - i));
2483 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
2487 G_WRITE_UNLOCK (&type_rw_lock);
2490 g_warning (G_STRLOC ": cannot remove unregistered class cache func %p with data %p",
2491 cache_func, cache_data);
2496 * g_type_add_interface_check:
2497 * @check_data: data to pass to @check_func
2498 * @check_func: function to be called after each interface
2501 * Adds a function to be called after an interface vtable is
2502 * initialized for any class (i.e. after the @interface_init member of
2503 * #GInterfaceInfo has been called).
2505 * This function is useful when you want to check an invariant that
2506 * depends on the interfaces of a class. For instance, the
2507 * implementation of #GObject uses this facility to check that an
2508 * object implements all of the properties that are defined on its
2514 g_type_add_interface_check (gpointer check_data,
2515 GTypeInterfaceCheckFunc check_func)
2519 g_return_if_fail (check_func != NULL);
2521 G_WRITE_LOCK (&type_rw_lock);
2522 i = static_n_iface_check_funcs++;
2523 static_iface_check_funcs = g_renew (IFaceCheckFunc, static_iface_check_funcs, static_n_iface_check_funcs);
2524 static_iface_check_funcs[i].check_data = check_data;
2525 static_iface_check_funcs[i].check_func = check_func;
2526 G_WRITE_UNLOCK (&type_rw_lock);
2530 * g_type_remove_interface_check:
2531 * @check_data: callback data passed to g_type_add_interface_check()
2532 * @check_func: callback function passed to g_type_add_interface_check()
2534 * Removes an interface check function added with
2535 * g_type_add_interface_check().
2540 g_type_remove_interface_check (gpointer check_data,
2541 GTypeInterfaceCheckFunc check_func)
2543 gboolean found_it = FALSE;
2546 g_return_if_fail (check_func != NULL);
2548 G_WRITE_LOCK (&type_rw_lock);
2549 for (i = 0; i < static_n_iface_check_funcs; i++)
2550 if (static_iface_check_funcs[i].check_data == check_data &&
2551 static_iface_check_funcs[i].check_func == check_func)
2553 static_n_iface_check_funcs--;
2554 g_memmove (static_iface_check_funcs + i,
2555 static_iface_check_funcs + i + 1,
2556 sizeof (static_iface_check_funcs[0]) * (static_n_iface_check_funcs - i));
2557 static_iface_check_funcs = g_renew (IFaceCheckFunc, static_iface_check_funcs, static_n_iface_check_funcs);
2561 G_WRITE_UNLOCK (&type_rw_lock);
2564 g_warning (G_STRLOC ": cannot remove unregistered class check func %p with data %p",
2565 check_func, check_data);
2568 /* --- type registration --- */
2570 * g_type_register_fundamental:
2571 * @type_id: A predefined type identifier.
2572 * @type_name: 0-terminated string used as the name of the new type.
2573 * @info: The #GTypeInfo structure for this type.
2574 * @finfo: The #GTypeFundamentalInfo structure for this type.
2575 * @flags: Bitwise combination of #GTypeFlags values.
2577 * Registers @type_id as the predefined identifier and @type_name as the
2578 * name of a fundamental type. The type system uses the information
2579 * contained in the #GTypeInfo structure pointed to by @info and the
2580 * #GTypeFundamentalInfo structure pointed to by @finfo to manage the
2581 * type and its instances. The value of @flags determines additional
2582 * characteristics of the fundamental type.
2584 * Returns: The predefined type identifier.
2587 g_type_register_fundamental (GType type_id,
2588 const gchar *type_name,
2589 const GTypeInfo *info,
2590 const GTypeFundamentalInfo *finfo,
2595 g_return_val_if_type_system_uninitialized (0);
2596 g_return_val_if_fail (type_id > 0, 0);
2597 g_return_val_if_fail (type_name != NULL, 0);
2598 g_return_val_if_fail (info != NULL, 0);
2599 g_return_val_if_fail (finfo != NULL, 0);
2601 if (!check_type_name_I (type_name))
2603 if ((type_id & TYPE_ID_MASK) ||
2604 type_id > G_TYPE_FUNDAMENTAL_MAX)
2606 g_warning ("attempt to register fundamental type `%s' with invalid type id (%" G_GSIZE_FORMAT ")",
2611 if ((finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
2612 !(finfo->type_flags & G_TYPE_FLAG_CLASSED))
2614 g_warning ("cannot register instantiatable fundamental type `%s' as non-classed",
2618 if (lookup_type_node_I (type_id))
2620 g_warning ("cannot register existing fundamental type `%s' (as `%s')",
2621 type_descriptive_name_I (type_id),
2626 G_WRITE_LOCK (&type_rw_lock);
2627 node = type_node_fundamental_new_W (type_id, type_name, finfo->type_flags);
2628 type_add_flags_W (node, flags);
2630 if (check_type_info_I (NULL, NODE_FUNDAMENTAL_TYPE (node), type_name, info))
2631 type_data_make_W (node, info,
2632 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
2633 G_WRITE_UNLOCK (&type_rw_lock);
2635 return NODE_TYPE (node);
2639 * g_type_register_static_simple:
2640 * @parent_type: Type from which this type will be derived.
2641 * @type_name: 0-terminated string used as the name of the new type.
2642 * @class_size: Size of the class structure (see #GTypeInfo)
2643 * @class_init: Location of the class initialization function (see #GTypeInfo)
2644 * @instance_size: Size of the instance structure (see #GTypeInfo)
2645 * @instance_init: Location of the instance initialization function (see #GTypeInfo)
2646 * @flags: Bitwise combination of #GTypeFlags values.
2648 * Registers @type_name as the name of a new static type derived from
2649 * @parent_type. The value of @flags determines the nature (e.g.
2650 * abstract or not) of the type. It works by filling a #GTypeInfo
2651 * struct and calling g_type_register_static().
2655 * Returns: The new type identifier.
2658 g_type_register_static_simple (GType parent_type,
2659 const gchar *type_name,
2661 GClassInitFunc class_init,
2662 guint instance_size,
2663 GInstanceInitFunc instance_init,
2668 info.class_size = class_size;
2669 info.base_init = NULL;
2670 info.base_finalize = NULL;
2671 info.class_init = class_init;
2672 info.class_finalize = NULL;
2673 info.class_data = NULL;
2674 info.instance_size = instance_size;
2675 info.n_preallocs = 0;
2676 info.instance_init = instance_init;
2677 info.value_table = NULL;
2679 return g_type_register_static (parent_type, type_name, &info, flags);
2683 * g_type_register_static:
2684 * @parent_type: Type from which this type will be derived.
2685 * @type_name: 0-terminated string used as the name of the new type.
2686 * @info: The #GTypeInfo structure for this type.
2687 * @flags: Bitwise combination of #GTypeFlags values.
2689 * Registers @type_name as the name of a new static type derived from
2690 * @parent_type. The type system uses the information contained in the
2691 * #GTypeInfo structure pointed to by @info to manage the type and its
2692 * instances (if not abstract). The value of @flags determines the nature
2693 * (e.g. abstract or not) of the type.
2695 * Returns: The new type identifier.
2698 g_type_register_static (GType parent_type,
2699 const gchar *type_name,
2700 const GTypeInfo *info,
2703 TypeNode *pnode, *node;
2706 g_return_val_if_type_system_uninitialized (0);
2707 g_return_val_if_fail (parent_type > 0, 0);
2708 g_return_val_if_fail (type_name != NULL, 0);
2709 g_return_val_if_fail (info != NULL, 0);
2711 if (!check_type_name_I (type_name) ||
2712 !check_derivation_I (parent_type, type_name))
2714 if (info->class_finalize)
2716 g_warning ("class finalizer specified for static type `%s'",
2721 pnode = lookup_type_node_I (parent_type);
2722 G_WRITE_LOCK (&type_rw_lock);
2723 type_data_ref_Wm (pnode);
2724 if (check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (pnode), type_name, info))
2726 node = type_node_new_W (pnode, type_name, NULL);
2727 type_add_flags_W (node, flags);
2728 type = NODE_TYPE (node);
2729 type_data_make_W (node, info,
2730 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
2732 G_WRITE_UNLOCK (&type_rw_lock);
2738 * g_type_register_dynamic:
2739 * @parent_type: Type from which this type will be derived.
2740 * @type_name: 0-terminated string used as the name of the new type.
2741 * @plugin: The #GTypePlugin structure to retrieve the #GTypeInfo from.
2742 * @flags: Bitwise combination of #GTypeFlags values.
2744 * Registers @type_name as the name of a new dynamic type derived from
2745 * @parent_type. The type system uses the information contained in the
2746 * #GTypePlugin structure pointed to by @plugin to manage the type and its
2747 * instances (if not abstract). The value of @flags determines the nature
2748 * (e.g. abstract or not) of the type.
2750 * Returns: The new type identifier or #G_TYPE_INVALID if registration failed.
2753 g_type_register_dynamic (GType parent_type,
2754 const gchar *type_name,
2755 GTypePlugin *plugin,
2758 TypeNode *pnode, *node;
2761 g_return_val_if_type_system_uninitialized (0);
2762 g_return_val_if_fail (parent_type > 0, 0);
2763 g_return_val_if_fail (type_name != NULL, 0);
2764 g_return_val_if_fail (plugin != NULL, 0);
2766 if (!check_type_name_I (type_name) ||
2767 !check_derivation_I (parent_type, type_name) ||
2768 !check_plugin_U (plugin, TRUE, FALSE, type_name))
2771 G_WRITE_LOCK (&type_rw_lock);
2772 pnode = lookup_type_node_I (parent_type);
2773 node = type_node_new_W (pnode, type_name, plugin);
2774 type_add_flags_W (node, flags);
2775 type = NODE_TYPE (node);
2776 G_WRITE_UNLOCK (&type_rw_lock);
2782 * g_type_add_interface_static:
2783 * @instance_type: #GType value of an instantiable type.
2784 * @interface_type: #GType value of an interface type.
2785 * @info: The #GInterfaceInfo structure for this
2786 * (@instance_type, @interface_type) combination.
2788 * Adds the static @interface_type to @instantiable_type. The information
2789 * contained in the #GTypeInterfaceInfo structure pointed to by @info
2790 * is used to manage the relationship.
2793 g_type_add_interface_static (GType instance_type,
2794 GType interface_type,
2795 const GInterfaceInfo *info)
2797 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
2798 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
2799 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
2801 /* we only need to lock class_init_rec_mutex if instance_type already has its
2802 * class initialized, however this function is rarely enough called to take
2803 * the simple route and always acquire class_init_rec_mutex.
2805 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2806 G_WRITE_LOCK (&type_rw_lock);
2807 if (check_add_interface_L (instance_type, interface_type))
2809 TypeNode *node = lookup_type_node_I (instance_type);
2810 TypeNode *iface = lookup_type_node_I (interface_type);
2811 if (check_interface_info_I (iface, NODE_TYPE (node), info))
2812 type_add_interface_Wm (node, iface, info, NULL);
2814 G_WRITE_UNLOCK (&type_rw_lock);
2815 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2819 * g_type_add_interface_dynamic:
2820 * @instance_type: the #GType value of an instantiable type.
2821 * @interface_type: the #GType value of an interface type.
2822 * @plugin: the #GTypePlugin structure to retrieve the #GInterfaceInfo from.
2824 * Adds the dynamic @interface_type to @instantiable_type. The information
2825 * contained in the #GTypePlugin structure pointed to by @plugin
2826 * is used to manage the relationship.
2829 g_type_add_interface_dynamic (GType instance_type,
2830 GType interface_type,
2831 GTypePlugin *plugin)
2834 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
2835 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
2836 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
2838 node = lookup_type_node_I (instance_type);
2839 if (!check_plugin_U (plugin, FALSE, TRUE, NODE_NAME (node)))
2842 /* see comment in g_type_add_interface_static() about class_init_rec_mutex */
2843 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2844 G_WRITE_LOCK (&type_rw_lock);
2845 if (check_add_interface_L (instance_type, interface_type))
2847 TypeNode *iface = lookup_type_node_I (interface_type);
2848 type_add_interface_Wm (node, iface, NULL, plugin);
2850 G_WRITE_UNLOCK (&type_rw_lock);
2851 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2855 /* --- public API functions --- */
2858 * @type: Type ID of a classed type.
2860 * Increments the reference count of the class structure belonging to
2861 * @type. This function will demand-create the class if it doesn't
2864 * Returns: The #GTypeClass structure for the given type ID.
2867 g_type_class_ref (GType type)
2874 /* optimize for common code path */
2875 node = lookup_type_node_I (type);
2876 if (!node || !node->is_classed)
2878 g_warning ("cannot retrieve class for invalid (unclassed) type `%s'",
2879 type_descriptive_name_I (type));
2883 if (G_LIKELY (type_data_ref_U (node)))
2885 if (G_LIKELY (g_atomic_int_get (&node->data->class.init_state) == INITIALIZED))
2886 return node->data->class.class;
2892 /* here, we either have node->data->class.class == NULL, or a recursive
2893 * call to g_type_class_ref() with a partly initialized class, or
2894 * node->data->class.init_state == INITIALIZED, because any
2895 * concurrently running initialization was guarded by class_init_rec_mutex.
2897 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2899 /* we need an initialized parent class for initializing derived classes */
2900 ptype = NODE_PARENT_TYPE (node);
2901 pclass = ptype ? g_type_class_ref (ptype) : NULL;
2903 G_WRITE_LOCK (&type_rw_lock);
2906 type_data_ref_Wm (node);
2908 if (!node->data->class.class) /* class uninitialized */
2909 type_class_init_Wm (node, pclass);
2911 G_WRITE_UNLOCK (&type_rw_lock);
2914 g_type_class_unref (pclass);
2916 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2918 return node->data->class.class;
2922 * g_type_class_unref:
2923 * @g_class: The #GTypeClass structure to unreference.
2925 * Decrements the reference count of the class structure being passed in.
2926 * Once the last reference count of a class has been released, classes
2927 * may be finalized by the type system, so further dereferencing of a
2928 * class pointer after g_type_class_unref() are invalid.
2931 g_type_class_unref (gpointer g_class)
2934 GTypeClass *class = g_class;
2936 g_return_if_fail (g_class != NULL);
2938 node = lookup_type_node_I (class->g_type);
2939 if (node && node->is_classed && NODE_REFCOUNT (node))
2940 type_data_unref_U (node, FALSE);
2942 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2943 type_descriptive_name_I (class->g_type));
2947 * g_type_class_unref_uncached:
2948 * @g_class: The #GTypeClass structure to unreference.
2950 * A variant of g_type_class_unref() for use in #GTypeClassCacheFunc
2951 * implementations. It unreferences a class without consulting the chain
2952 * of #GTypeClassCacheFunc<!-- -->s, avoiding the recursion which would occur
2956 g_type_class_unref_uncached (gpointer g_class)
2959 GTypeClass *class = g_class;
2961 g_return_if_fail (g_class != NULL);
2963 node = lookup_type_node_I (class->g_type);
2964 if (node && node->is_classed && NODE_REFCOUNT (node))
2965 type_data_unref_U (node, TRUE);
2967 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2968 type_descriptive_name_I (class->g_type));
2972 * g_type_class_peek:
2973 * @type: Type ID of a classed type.
2975 * This function is essentially the same as g_type_class_ref(), except that
2976 * the classes reference count isn't incremented. As a consequence, this function
2977 * may return %NULL if the class of the type passed in does not currently
2978 * exist (hasn't been referenced before).
2980 * Returns: The #GTypeClass structure for the given type ID or %NULL
2981 * if the class does not currently exist.
2984 g_type_class_peek (GType type)
2989 node = lookup_type_node_I (type);
2990 if (node && node->is_classed && NODE_REFCOUNT (node) &&
2991 g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
2992 /* ref_count _may_ be 0 */
2993 class = node->data->class.class;
3001 * g_type_class_peek_static:
3002 * @type: Type ID of a classed type.
3004 * A more efficient version of g_type_class_peek() which works only for
3008 * Returns: The #GTypeClass structure for the given type ID or %NULL
3009 * if the class does not currently exist or is dynamically loaded.
3012 g_type_class_peek_static (GType type)
3017 node = lookup_type_node_I (type);
3018 if (node && node->is_classed && NODE_REFCOUNT (node) &&
3019 /* peek only static types: */ node->plugin == NULL &&
3020 g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
3021 /* ref_count _may_ be 0 */
3022 class = node->data->class.class;
3030 * g_type_class_peek_parent:
3031 * @g_class: The #GTypeClass structure to retrieve the parent class for.
3033 * This is a convenience function often needed in class initializers.
3034 * It returns the class structure of the immediate parent type of the
3035 * class passed in. Since derived classes hold a reference count on
3036 * their parent classes as long as they are instantiated, the returned
3037 * class will always exist. This function is essentially equivalent
3041 * g_type_class_peek (g_type_parent (G_TYPE_FROM_CLASS (g_class)));
3044 * Returns: The parent class of @g_class.
3047 g_type_class_peek_parent (gpointer g_class)
3050 gpointer class = NULL;
3052 g_return_val_if_fail (g_class != NULL, NULL);
3054 node = lookup_type_node_I (G_TYPE_FROM_CLASS (g_class));
3055 /* We used to acquire a read lock here. That is not necessary, since
3056 * parent->data->class.class is constant as long as the derived class
3059 if (node && node->is_classed && node->data && NODE_PARENT_TYPE (node))
3061 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
3062 class = node->data->class.class;
3064 else if (NODE_PARENT_TYPE (node))
3065 g_warning (G_STRLOC ": invalid class pointer `%p'", g_class);
3071 * g_type_interface_peek:
3072 * @instance_class: A #GTypeClass structure.
3073 * @iface_type: An interface ID which this class conforms to.
3075 * Returns the #GTypeInterface structure of an interface to which the
3076 * passed in class conforms.
3078 * Returns: The GTypeInterface structure of iface_type if implemented
3079 * by @instance_class, %NULL otherwise
3082 g_type_interface_peek (gpointer instance_class,
3087 gpointer vtable = NULL;
3088 GTypeClass *class = instance_class;
3090 g_return_val_if_fail (instance_class != NULL, NULL);
3092 node = lookup_type_node_I (class->g_type);
3093 iface = lookup_type_node_I (iface_type);
3094 if (node && node->is_instantiatable && iface)
3095 type_lookup_iface_vtable_I (node, iface, &vtable);
3097 g_warning (G_STRLOC ": invalid class pointer `%p'", class);
3103 * g_type_interface_peek_parent:
3104 * @g_iface: A #GTypeInterface structure.
3106 * Returns the corresponding #GTypeInterface structure of the parent type
3107 * of the instance type to which @g_iface belongs. This is useful when
3108 * deriving the implementation of an interface from the parent type and
3109 * then possibly overriding some methods.
3111 * Returns: The corresponding #GTypeInterface structure of the parent
3112 * type of the instance type to which @g_iface belongs, or
3113 * %NULL if the parent type doesn't conform to the interface.
3116 g_type_interface_peek_parent (gpointer g_iface)
3120 gpointer vtable = NULL;
3121 GTypeInterface *iface_class = g_iface;
3123 g_return_val_if_fail (g_iface != NULL, NULL);
3125 iface = lookup_type_node_I (iface_class->g_type);
3126 node = lookup_type_node_I (iface_class->g_instance_type);
3128 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
3129 if (node && node->is_instantiatable && iface)
3130 type_lookup_iface_vtable_I (node, iface, &vtable);
3132 g_warning (G_STRLOC ": invalid interface pointer `%p'", g_iface);
3138 * g_type_default_interface_ref:
3139 * @g_type: an interface type
3141 * Increments the reference count for the interface type @g_type,
3142 * and returns the default interface vtable for the type.
3144 * If the type is not currently in use, then the default vtable
3145 * for the type will be created and initalized by calling
3146 * the base interface init and default vtable init functions for
3147 * the type (the @<structfield>base_init</structfield>
3148 * and <structfield>class_init</structfield> members of #GTypeInfo).
3149 * Calling g_type_default_interface_ref() is useful when you
3150 * want to make sure that signals and properties for an interface
3151 * have been installed.
3155 * Returns: the default vtable for the interface; call
3156 * g_type_default_interface_unref() when you are done using
3160 g_type_default_interface_ref (GType g_type)
3163 gpointer dflt_vtable;
3165 G_WRITE_LOCK (&type_rw_lock);
3167 node = lookup_type_node_I (g_type);
3168 if (!node || !NODE_IS_IFACE (node) ||
3169 (node->data && NODE_REFCOUNT (node) == 0))
3171 G_WRITE_UNLOCK (&type_rw_lock);
3172 g_warning ("cannot retrieve default vtable for invalid or non-interface type '%s'",
3173 type_descriptive_name_I (g_type));
3177 if (!node->data || !node->data->iface.dflt_vtable)
3179 G_WRITE_UNLOCK (&type_rw_lock);
3180 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
3181 G_WRITE_LOCK (&type_rw_lock);
3182 node = lookup_type_node_I (g_type);
3183 type_data_ref_Wm (node);
3184 type_iface_ensure_dflt_vtable_Wm (node);
3185 g_static_rec_mutex_unlock (&class_init_rec_mutex);
3188 type_data_ref_Wm (node); /* ref_count >= 1 already */
3190 dflt_vtable = node->data->iface.dflt_vtable;
3191 G_WRITE_UNLOCK (&type_rw_lock);
3197 * g_type_default_interface_peek:
3198 * @g_type: an interface type
3200 * If the interface type @g_type is currently in use, returns its
3201 * default interface vtable.
3205 * Returns: the default vtable for the interface, or %NULL
3206 * if the type is not currently in use.
3209 g_type_default_interface_peek (GType g_type)
3214 node = lookup_type_node_I (g_type);
3215 if (node && NODE_IS_IFACE (node) && NODE_REFCOUNT (node))
3216 vtable = node->data->iface.dflt_vtable;
3224 * g_type_default_interface_unref:
3225 * @g_iface: the default vtable structure for a interface, as
3226 * returned by g_type_default_interface_ref()
3228 * Decrements the reference count for the type corresponding to the
3229 * interface default vtable @g_iface. If the type is dynamic, then
3230 * when no one is using the interface and all references have
3231 * been released, the finalize function for the interface's default
3232 * vtable (the <structfield>class_finalize</structfield> member of
3233 * #GTypeInfo) will be called.
3238 g_type_default_interface_unref (gpointer g_iface)
3241 GTypeInterface *vtable = g_iface;
3243 g_return_if_fail (g_iface != NULL);
3245 node = lookup_type_node_I (vtable->g_type);
3246 if (node && NODE_IS_IFACE (node))
3247 type_data_unref_U (node, FALSE);
3249 g_warning ("cannot unreference invalid interface default vtable for '%s'",
3250 type_descriptive_name_I (vtable->g_type));
3255 * @type: Type to return name for.
3257 * Get the unique name that is assigned to a type ID. Note that this
3258 * function (like all other GType API) cannot cope with invalid type
3259 * IDs. %G_TYPE_INVALID may be passed to this function, as may be any
3260 * other validly registered type ID, but randomized type IDs should
3261 * not be passed in and will most likely lead to a crash.
3263 * Returns: Static type name or %NULL.
3265 G_CONST_RETURN gchar*
3266 g_type_name (GType type)
3270 g_return_val_if_type_system_uninitialized (NULL);
3272 node = lookup_type_node_I (type);
3274 return node ? NODE_NAME (node) : NULL;
3279 * @type: Type to return quark of type name for.
3281 * Get the corresponding quark of the type IDs name.
3283 * Returns: The type names quark or 0.
3286 g_type_qname (GType type)
3290 node = lookup_type_node_I (type);
3292 return node ? node->qname : 0;
3297 * @name: Type name to lookup.
3299 * Lookup the type ID from a given type name, returning 0 if no type
3300 * has been registered under this name (this is the preferred method
3301 * to find out by name whether a specific type has been registered
3304 * Returns: Corresponding type ID or 0.
3307 g_type_from_name (const gchar *name)
3312 g_return_val_if_fail (name != NULL, 0);
3314 quark = g_quark_try_string (name);
3317 G_READ_LOCK (&type_rw_lock);
3318 type = (GType) g_hash_table_lookup (static_type_nodes_ht, GUINT_TO_POINTER (quark));
3319 G_READ_UNLOCK (&type_rw_lock);
3327 * @type: The derived type.
3329 * Return the direct parent type of the passed in type. If the passed
3330 * in type has no parent, i.e. is a fundamental type, 0 is returned.
3332 * Returns: The parent type.
3335 g_type_parent (GType type)
3339 node = lookup_type_node_I (type);
3341 return node ? NODE_PARENT_TYPE (node) : 0;
3346 * @type: A #GType value.
3348 * Returns the length of the ancestry of the passed in type. This
3349 * includes the type itself, so that e.g. a fundamental type has depth 1.
3351 * Returns: The depth of @type.
3354 g_type_depth (GType type)
3358 node = lookup_type_node_I (type);
3360 return node ? node->n_supers + 1 : 0;
3365 * @leaf_type: Descendant of @root_type and the type to be returned.
3366 * @root_type: Immediate parent of the returned type.
3368 * Given a @leaf_type and a @root_type which is contained in its
3369 * anchestry, return the type that @root_type is the immediate parent
3370 * of. In other words, this function determines the type that is
3371 * derived directly from @root_type which is also a base class of
3372 * @leaf_type. Given a root type and a leaf type, this function can
3373 * be used to determine the types and order in which the leaf type is
3374 * descended from the root type.
3376 * Returns: Immediate child of @root_type and anchestor of @leaf_type.
3379 g_type_next_base (GType type,
3385 node = lookup_type_node_I (type);
3388 TypeNode *base_node = lookup_type_node_I (base_type);
3390 if (base_node && base_node->n_supers < node->n_supers)
3392 guint n = node->n_supers - base_node->n_supers;
3394 if (node->supers[n] == base_type)
3395 atype = node->supers[n - 1];
3402 static inline gboolean
3403 type_node_check_conformities_UorL (TypeNode *node,
3404 TypeNode *iface_node,
3405 /* support_inheritance */
3406 gboolean support_interfaces,
3407 gboolean support_prerequisites,
3412 if (/* support_inheritance && */
3413 NODE_IS_ANCESTOR (iface_node, node))
3416 support_interfaces = support_interfaces && node->is_instantiatable && NODE_IS_IFACE (iface_node);
3417 support_prerequisites = support_prerequisites && NODE_IS_IFACE (node);
3419 if (support_interfaces)
3423 if (type_lookup_iface_entry_L (node, iface_node))
3428 if (type_lookup_iface_vtable_I (node, iface_node, NULL))
3433 support_prerequisites)
3436 G_READ_LOCK (&type_rw_lock);
3437 if (support_prerequisites && type_lookup_prerequisite_L (node, NODE_TYPE (iface_node)))
3440 G_READ_UNLOCK (&type_rw_lock);
3446 type_node_is_a_L (TypeNode *node,
3447 TypeNode *iface_node)
3449 return type_node_check_conformities_UorL (node, iface_node, TRUE, TRUE, TRUE);
3452 static inline gboolean
3453 type_node_conforms_to_U (TypeNode *node,
3454 TypeNode *iface_node,
3455 gboolean support_interfaces,
3456 gboolean support_prerequisites)
3458 return type_node_check_conformities_UorL (node, iface_node, support_interfaces, support_prerequisites, FALSE);
3463 * @type: Type to check anchestry for.
3464 * @is_a_type: Possible anchestor of @type or interface @type could conform to.
3466 * If @is_a_type is a derivable type, check whether @type is a
3467 * descendant of @is_a_type. If @is_a_type is an interface, check
3468 * whether @type conforms to it.
3470 * Returns: %TRUE if @type is_a @is_a_type holds true.
3473 g_type_is_a (GType type,
3476 TypeNode *node, *iface_node;
3479 node = lookup_type_node_I (type);
3480 iface_node = lookup_type_node_I (iface_type);
3481 is_a = node && iface_node && type_node_conforms_to_U (node, iface_node, TRUE, TRUE);
3488 * @type: The parent type.
3489 * @n_children: Optional #guint pointer to contain the number of child types.
3491 * Return a newly allocated and 0-terminated array of type IDs, listing the
3492 * child types of @type. The return value has to be g_free()ed after use.
3494 * Returns: Newly allocated and 0-terminated array of child types.
3497 g_type_children (GType type,
3502 node = lookup_type_node_I (type);
3507 G_READ_LOCK (&type_rw_lock); /* ->children is relocatable */
3508 children = g_new (GType, node->n_children + 1);
3509 memcpy (children, node->children, sizeof (GType) * node->n_children);
3510 children[node->n_children] = 0;
3513 *n_children = node->n_children;
3514 G_READ_UNLOCK (&type_rw_lock);
3528 * g_type_interfaces:
3529 * @type: The type to list interface types for.
3530 * @n_interfaces: Optional #guint pointer to contain the number of
3533 * Return a newly allocated and 0-terminated array of type IDs, listing the
3534 * interface types that @type conforms to. The return value has to be
3535 * g_free()ed after use.
3537 * Returns: Newly allocated and 0-terminated array of interface types.
3540 g_type_interfaces (GType type,
3541 guint *n_interfaces)
3545 node = lookup_type_node_I (type);
3546 if (node && node->is_instantiatable)
3548 IFaceEntries *entries;
3552 G_READ_LOCK (&type_rw_lock);
3553 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
3556 ifaces = g_new (GType, IFACE_ENTRIES_N_ENTRIES (entries) + 1);
3557 for (i = 0; i < IFACE_ENTRIES_N_ENTRIES (entries); i++)
3558 ifaces[i] = entries->entry[i].iface_type;
3562 ifaces = g_new (GType, 1);
3569 G_READ_UNLOCK (&type_rw_lock);
3582 typedef struct _QData QData;
3594 static inline gpointer
3595 type_get_qdata_L (TypeNode *node,
3598 GData *gdata = node->global_gdata;
3600 if (quark && gdata && gdata->n_qdatas)
3602 QData *qdatas = gdata->qdatas - 1;
3603 guint n_qdatas = gdata->n_qdatas;
3610 i = (n_qdatas + 1) / 2;
3612 if (quark == check->quark)
3614 else if (quark > check->quark)
3619 else /* if (quark < check->quark) */
3630 * @quark: a #GQuark id to identify the data
3632 * Obtains data which has previously been attached to @type
3633 * with g_type_set_qdata().
3635 * Returns: the data, or %NULL if no data was found
3638 g_type_get_qdata (GType type,
3644 node = lookup_type_node_I (type);
3647 G_READ_LOCK (&type_rw_lock);
3648 data = type_get_qdata_L (node, quark);
3649 G_READ_UNLOCK (&type_rw_lock);
3653 g_return_val_if_fail (node != NULL, NULL);
3660 type_set_qdata_W (TypeNode *node,
3668 /* setup qdata list if necessary */
3669 if (!node->global_gdata)
3670 node->global_gdata = g_new0 (GData, 1);
3671 gdata = node->global_gdata;
3673 /* try resetting old data */
3674 qdata = gdata->qdatas;
3675 for (i = 0; i < gdata->n_qdatas; i++)
3676 if (qdata[i].quark == quark)
3678 qdata[i].data = data;
3684 gdata->qdatas = g_renew (QData, gdata->qdatas, gdata->n_qdatas);
3685 qdata = gdata->qdatas;
3686 for (i = 0; i < gdata->n_qdatas - 1; i++)
3687 if (qdata[i].quark > quark)
3689 g_memmove (qdata + i + 1, qdata + i, sizeof (qdata[0]) * (gdata->n_qdatas - i - 1));
3690 qdata[i].quark = quark;
3691 qdata[i].data = data;
3697 * @quark: a #GQuark id to identify the data
3700 * Attaches arbitrary data to a type.
3703 g_type_set_qdata (GType type,
3709 g_return_if_fail (quark != 0);
3711 node = lookup_type_node_I (type);
3714 G_WRITE_LOCK (&type_rw_lock);
3715 type_set_qdata_W (node, quark, data);
3716 G_WRITE_UNLOCK (&type_rw_lock);
3719 g_return_if_fail (node != NULL);
3723 type_add_flags_W (TypeNode *node,
3728 g_return_if_fail ((flags & ~TYPE_FLAG_MASK) == 0);
3729 g_return_if_fail (node != NULL);
3731 if ((flags & TYPE_FLAG_MASK) && node->is_classed && node->data && node->data->class.class)
3732 g_warning ("tagging type `%s' as abstract after class initialization", NODE_NAME (node));
3733 dflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
3735 type_set_qdata_W (node, static_quark_type_flags, GUINT_TO_POINTER (dflags));
3740 * @type: the #GType value of a static, classed type.
3741 * @query: A user provided structure that is filled in with constant values
3744 * Queries the type system for information about a specific type.
3745 * This function will fill in a user-provided structure to hold
3746 * type-specific information. If an invalid #GType is passed in, the
3747 * @type member of the #GTypeQuery is 0. All members filled into the
3748 * #GTypeQuery structure should be considered constant and have to be
3752 g_type_query (GType type,
3757 g_return_if_fail (query != NULL);
3759 /* if node is not static and classed, we won't allow query */
3761 node = lookup_type_node_I (type);
3762 if (node && node->is_classed && !node->plugin)
3764 /* type is classed and probably even instantiatable */
3765 G_READ_LOCK (&type_rw_lock);
3766 if (node->data) /* type is static or referenced */
3768 query->type = NODE_TYPE (node);
3769 query->type_name = NODE_NAME (node);
3770 query->class_size = node->data->class.class_size;
3771 query->instance_size = node->is_instantiatable ? node->data->instance.instance_size : 0;
3773 G_READ_UNLOCK (&type_rw_lock);
3778 /* --- implementation details --- */
3780 g_type_test_flags (GType type,
3784 gboolean result = FALSE;
3786 node = lookup_type_node_I (type);
3789 guint fflags = flags & TYPE_FUNDAMENTAL_FLAG_MASK;
3790 guint tflags = flags & TYPE_FLAG_MASK;
3794 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (node);
3796 fflags = (finfo->type_flags & fflags) == fflags;
3803 G_READ_LOCK (&type_rw_lock);
3804 tflags = (tflags & GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))) == tflags;
3805 G_READ_UNLOCK (&type_rw_lock);
3810 result = tflags && fflags;
3817 * g_type_get_plugin:
3818 * @type: The #GType to retrieve the plugin for.
3820 * Returns the #GTypePlugin structure for @type or
3821 * %NULL if @type does not have a #GTypePlugin structure.
3823 * Returns: The corresponding plugin if @type is a dynamic type,
3827 g_type_get_plugin (GType type)
3831 node = lookup_type_node_I (type);
3833 return node ? node->plugin : NULL;
3837 * g_type_interface_get_plugin:
3838 * @instance_type: the #GType value of an instantiatable type.
3839 * @interface_type: the #GType value of an interface type.
3841 * Returns the #GTypePlugin structure for the dynamic interface
3842 * @interface_type which has been added to @instance_type, or %NULL if
3843 * @interface_type has not been added to @instance_type or does not
3844 * have a #GTypePlugin structure. See g_type_add_interface_dynamic().
3846 * Returns: the #GTypePlugin for the dynamic interface @interface_type
3847 * of @instance_type.
3850 g_type_interface_get_plugin (GType instance_type,
3851 GType interface_type)
3856 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL); /* G_TYPE_IS_INTERFACE() is an external call: _U */
3858 node = lookup_type_node_I (instance_type);
3859 iface = lookup_type_node_I (interface_type);
3862 IFaceHolder *iholder;
3863 GTypePlugin *plugin;
3865 G_READ_LOCK (&type_rw_lock);
3867 iholder = iface_node_get_holders_L (iface);
3868 while (iholder && iholder->instance_type != instance_type)
3869 iholder = iholder->next;
3870 plugin = iholder ? iholder->plugin : NULL;
3872 G_READ_UNLOCK (&type_rw_lock);
3877 g_return_val_if_fail (node == NULL, NULL);
3878 g_return_val_if_fail (iface == NULL, NULL);
3880 g_warning (G_STRLOC ": attempt to look up plugin for invalid instance/interface type pair.");
3886 * g_type_fundamental_next:
3888 * Returns the next free fundamental type id which can be used to
3889 * register a new fundamental type with g_type_register_fundamental().
3890 * The returned type ID represents the highest currently registered
3891 * fundamental type identifier.
3893 * Returns: The nextmost fundamental type ID to be registered,
3894 * or 0 if the type system ran out of fundamental type IDs.
3897 g_type_fundamental_next (void)
3901 G_READ_LOCK (&type_rw_lock);
3902 type = static_fundamental_next;
3903 G_READ_UNLOCK (&type_rw_lock);
3904 type = G_TYPE_MAKE_FUNDAMENTAL (type);
3905 return type <= G_TYPE_FUNDAMENTAL_MAX ? type : 0;
3909 * g_type_fundamental:
3910 * @type_id: valid type ID
3912 * Internal function, used to extract the fundamental type ID portion.
3913 * use G_TYPE_FUNDAMENTAL() instead.
3915 * Returns: fundamental type ID
3918 g_type_fundamental (GType type_id)
3920 TypeNode *node = lookup_type_node_I (type_id);
3922 return node ? NODE_FUNDAMENTAL_TYPE (node) : 0;
3926 g_type_check_instance_is_a (GTypeInstance *type_instance,
3929 TypeNode *node, *iface;
3932 if (!type_instance || !type_instance->g_class)
3935 node = lookup_type_node_I (type_instance->g_class->g_type);
3936 iface = lookup_type_node_I (iface_type);
3937 check = node && node->is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
3943 g_type_check_class_is_a (GTypeClass *type_class,
3946 TypeNode *node, *iface;
3952 node = lookup_type_node_I (type_class->g_type);
3953 iface = lookup_type_node_I (is_a_type);
3954 check = node && node->is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
3960 g_type_check_instance_cast (GTypeInstance *type_instance,
3965 if (type_instance->g_class)
3967 TypeNode *node, *iface;
3968 gboolean is_instantiatable, check;
3970 node = lookup_type_node_I (type_instance->g_class->g_type);
3971 is_instantiatable = node && node->is_instantiatable;
3972 iface = lookup_type_node_I (iface_type);
3973 check = is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
3975 return type_instance;
3977 if (is_instantiatable)
3978 g_warning ("invalid cast from `%s' to `%s'",
3979 type_descriptive_name_I (type_instance->g_class->g_type),
3980 type_descriptive_name_I (iface_type));
3982 g_warning ("invalid uninstantiatable type `%s' in cast to `%s'",
3983 type_descriptive_name_I (type_instance->g_class->g_type),
3984 type_descriptive_name_I (iface_type));
3987 g_warning ("invalid unclassed pointer in cast to `%s'",
3988 type_descriptive_name_I (iface_type));
3991 return type_instance;
3995 g_type_check_class_cast (GTypeClass *type_class,
4000 TypeNode *node, *iface;
4001 gboolean is_classed, check;
4003 node = lookup_type_node_I (type_class->g_type);
4004 is_classed = node && node->is_classed;
4005 iface = lookup_type_node_I (is_a_type);
4006 check = is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
4011 g_warning ("invalid class cast from `%s' to `%s'",
4012 type_descriptive_name_I (type_class->g_type),
4013 type_descriptive_name_I (is_a_type));
4015 g_warning ("invalid unclassed type `%s' in class cast to `%s'",
4016 type_descriptive_name_I (type_class->g_type),
4017 type_descriptive_name_I (is_a_type));
4020 g_warning ("invalid class cast from (NULL) pointer to `%s'",
4021 type_descriptive_name_I (is_a_type));
4026 * g_type_check_instance:
4027 * @instance: A valid #GTypeInstance structure.
4029 * Private helper function to aid implementation of the G_TYPE_CHECK_INSTANCE()
4032 * @Returns: #TRUE if @instance is valid, #FALSE otherwise.
4035 g_type_check_instance (GTypeInstance *type_instance)
4037 /* this function is just here to make the signal system
4038 * conveniently elaborated on instance checks
4042 if (type_instance->g_class)
4044 TypeNode *node = lookup_type_node_I (type_instance->g_class->g_type);
4046 if (node && node->is_instantiatable)
4049 g_warning ("instance of invalid non-instantiatable type `%s'",
4050 type_descriptive_name_I (type_instance->g_class->g_type));
4053 g_warning ("instance with invalid (NULL) class pointer");
4056 g_warning ("invalid (NULL) pointer instance");
4061 static inline gboolean
4062 type_check_is_value_type_U (GType type)
4064 GTypeFlags tflags = G_TYPE_FLAG_VALUE_ABSTRACT;
4067 /* common path speed up */
4068 node = lookup_type_node_I (type);
4069 if (node && node->mutatable_check_cache)
4072 G_READ_LOCK (&type_rw_lock);
4076 if (node->data && NODE_REFCOUNT (node) > 0 &&
4077 node->data->common.value_table->value_init)
4078 tflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
4079 else if (NODE_IS_IFACE (node))
4083 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
4085 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
4086 TypeNode *prnode = lookup_type_node_I (prtype);
4088 if (prnode->is_instantiatable)
4091 node = lookup_type_node_I (type);
4097 G_READ_UNLOCK (&type_rw_lock);
4099 return !(tflags & G_TYPE_FLAG_VALUE_ABSTRACT);
4103 g_type_check_is_value_type (GType type)
4105 return type_check_is_value_type_U (type);
4109 g_type_check_value (GValue *value)
4111 return value && type_check_is_value_type_U (value->g_type);
4115 g_type_check_value_holds (GValue *value,
4118 return value && type_check_is_value_type_U (value->g_type) && g_type_is_a (value->g_type, type);
4122 * g_type_value_table_peek:
4123 * @type: A #GType value.
4125 * Returns the location of the #GTypeValueTable associated with @type.
4126 * <emphasis>Note that this function should only be used from source code
4127 * that implements or has internal knowledge of the implementation of
4130 * Returns: Location of the #GTypeValueTable associated with @type or
4131 * %NULL if there is no #GTypeValueTable associated with @type.
4134 g_type_value_table_peek (GType type)
4136 GTypeValueTable *vtable = NULL;
4137 TypeNode *node = lookup_type_node_I (type);
4138 gboolean has_refed_data, has_table;
4140 if (node && NODE_REFCOUNT (node) && node->mutatable_check_cache)
4141 return node->data->common.value_table;
4143 G_READ_LOCK (&type_rw_lock);
4146 has_refed_data = node && node->data && NODE_REFCOUNT (node) > 0;
4147 has_table = has_refed_data && node->data->common.value_table->value_init;
4151 vtable = node->data->common.value_table;
4152 else if (NODE_IS_IFACE (node))
4156 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
4158 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
4159 TypeNode *prnode = lookup_type_node_I (prtype);
4161 if (prnode->is_instantiatable)
4164 node = lookup_type_node_I (type);
4165 goto restart_table_peek;
4171 G_READ_UNLOCK (&type_rw_lock);
4177 g_warning (G_STRLOC ": type id `%" G_GSIZE_FORMAT "' is invalid", type);
4178 if (!has_refed_data)
4179 g_warning ("can't peek value table for type `%s' which is not currently referenced",
4180 type_descriptive_name_I (type));
4185 G_CONST_RETURN gchar*
4186 g_type_name_from_instance (GTypeInstance *instance)
4189 return "<NULL-instance>";
4191 return g_type_name_from_class (instance->g_class);
4194 G_CONST_RETURN gchar*
4195 g_type_name_from_class (GTypeClass *g_class)
4198 return "<NULL-class>";
4200 return g_type_name (g_class->g_type);
4204 /* --- private api for gboxed.c --- */
4206 _g_type_boxed_copy (GType type, gpointer value)
4208 TypeNode *node = lookup_type_node_I (type);
4210 return node->data->boxed.copy_func (value);
4214 _g_type_boxed_free (GType type, gpointer value)
4216 TypeNode *node = lookup_type_node_I (type);
4218 node->data->boxed.free_func (value);
4222 _g_type_boxed_init (GType type,
4223 GBoxedCopyFunc copy_func,
4224 GBoxedFreeFunc free_func)
4226 TypeNode *node = lookup_type_node_I (type);
4228 node->data->boxed.copy_func = copy_func;
4229 node->data->boxed.free_func = free_func;
4232 /* --- initialization --- */
4234 * g_type_init_with_debug_flags:
4235 * @debug_flags: Bitwise combination of #GTypeDebugFlags values for
4236 * debugging purposes.
4238 * Similar to g_type_init(), but additionally sets debug flags.
4241 g_type_init_with_debug_flags (GTypeDebugFlags debug_flags)
4243 G_LOCK_DEFINE_STATIC (type_init_lock);
4244 const gchar *env_string;
4247 volatile GType votype;
4249 #ifdef G_THREADS_ENABLED
4250 if (!g_thread_get_initialized())
4251 g_thread_init (NULL);
4254 G_LOCK (type_init_lock);
4256 G_WRITE_LOCK (&type_rw_lock);
4258 if (static_quark_type_flags)
4260 G_WRITE_UNLOCK (&type_rw_lock);
4261 G_UNLOCK (type_init_lock);
4265 /* setup GObject library wide debugging flags */
4266 _g_type_debug_flags = debug_flags & G_TYPE_DEBUG_MASK;
4267 env_string = g_getenv ("GOBJECT_DEBUG");
4268 if (env_string != NULL)
4270 static GDebugKey debug_keys[] = {
4271 { "objects", G_TYPE_DEBUG_OBJECTS },
4272 { "signals", G_TYPE_DEBUG_SIGNALS },
4275 _g_type_debug_flags |= g_parse_debug_string (env_string,
4277 sizeof (debug_keys) / sizeof (debug_keys[0]));
4282 static_quark_type_flags = g_quark_from_static_string ("-g-type-private--GTypeFlags");
4283 static_quark_iface_holder = g_quark_from_static_string ("-g-type-private--IFaceHolder");
4284 static_quark_dependants_array = g_quark_from_static_string ("-g-type-private--dependants-array");
4286 /* type qname hash table */
4287 static_type_nodes_ht = g_hash_table_new (g_direct_hash, g_direct_equal);
4289 /* invalid type G_TYPE_INVALID (0)
4291 static_fundamental_type_nodes[0] = NULL;
4293 /* void type G_TYPE_NONE
4295 node = type_node_fundamental_new_W (G_TYPE_NONE, g_intern_static_string ("void"), 0);
4296 votype = NODE_TYPE (node);
4297 g_assert (votype == G_TYPE_NONE);
4299 /* interface fundamental type G_TYPE_INTERFACE (!classed)
4301 memset (&info, 0, sizeof (info));
4302 node = type_node_fundamental_new_W (G_TYPE_INTERFACE, g_intern_static_string ("GInterface"), G_TYPE_FLAG_DERIVABLE);
4303 votype = NODE_TYPE (node);
4304 type_data_make_W (node, &info, NULL);
4305 g_assert (votype == G_TYPE_INTERFACE);
4307 G_WRITE_UNLOCK (&type_rw_lock);
4311 /* G_TYPE_TYPE_PLUGIN
4313 votype = g_type_plugin_get_type ();
4315 /* G_TYPE_* value types
4317 g_value_types_init ();
4319 /* G_TYPE_ENUM & G_TYPE_FLAGS
4321 g_enum_types_init ();
4325 g_boxed_type_init ();
4329 g_param_type_init ();
4333 g_object_type_init ();
4335 /* G_TYPE_PARAM_* pspec types
4337 g_param_spec_types_init ();
4339 /* Value Transformations
4341 g_value_transforms_init ();
4347 G_UNLOCK (type_init_lock);
4353 * Prior to any use of the type system, g_type_init() has to be called
4354 * to initialize the type system and assorted other code portions
4355 * (such as the various fundamental type implementations or the signal
4358 * Since version 2.24 this also initializes the thread system
4363 g_type_init_with_debug_flags (0);
4367 * g_type_class_add_private:
4368 * @g_class: class structure for an instantiatable type
4369 * @private_size: size of private structure.
4371 * Registers a private structure for an instantiatable type;
4372 * when an object is allocated, the private structures for
4373 * the type and all of its parent types are allocated
4374 * sequentially in the same memory block as the public
4375 * structures. This function should be called in the
4376 * type's class_init() function. The private structure can
4377 * be retrieved using the G_TYPE_INSTANCE_GET_PRIVATE() macro.
4378 * The following example shows attaching a private structure
4379 * <structname>MyObjectPrivate</structname> to an object
4380 * <structname>MyObject</structname> defined in the standard GObject
4382 * type's class_init() function.
4385 * typedef struct _MyObject MyObject;
4386 * typedef struct _MyObjectPrivate MyObjectPrivate;
4388 * struct _MyObject {
4391 * MyObjectPrivate *priv;
4394 * struct _MyObjectPrivate {
4399 * my_object_class_init (MyObjectClass *klass)
4401 * g_type_class_add_private (klass, sizeof (MyObjectPrivate));
4405 * my_object_init (MyObject *my_object)
4407 * my_object->priv = G_TYPE_INSTANCE_GET_PRIVATE (my_object,
4413 * my_object_get_some_field (MyObject *my_object)
4415 * MyObjectPrivate *priv = my_object->priv;
4417 * return priv->some_field;
4424 g_type_class_add_private (gpointer g_class,
4427 GType instance_type = ((GTypeClass *)g_class)->g_type;
4428 TypeNode *node = lookup_type_node_I (instance_type);
4431 g_return_if_fail (private_size > 0);
4433 if (!node || !node->is_instantiatable || !node->data || node->data->class.class != g_class)
4435 g_warning ("cannot add private field to invalid (non-instantiatable) type '%s'",
4436 type_descriptive_name_I (instance_type));
4440 if (NODE_PARENT_TYPE (node))
4442 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
4443 if (node->data->instance.private_size != pnode->data->instance.private_size)
4445 g_warning ("g_type_add_private() called multiple times for the same type");
4450 G_WRITE_LOCK (&type_rw_lock);
4452 offset = ALIGN_STRUCT (node->data->instance.private_size);
4453 node->data->instance.private_size = offset + private_size;
4455 G_WRITE_UNLOCK (&type_rw_lock);
4459 g_type_instance_get_private (GTypeInstance *instance,
4462 TypeNode *instance_node;
4463 TypeNode *private_node;
4464 TypeNode *parent_node;
4468 g_return_val_if_fail (instance != NULL && instance->g_class != NULL, NULL);
4470 /* while instances are initialized, their class pointers change,
4471 * so figure the instances real class first
4473 class = instance_real_class_get (instance);
4475 class = instance->g_class;
4477 instance_node = lookup_type_node_I (class->g_type);
4478 if (G_UNLIKELY (!instance_node || !instance_node->is_instantiatable))
4480 g_warning ("instance of invalid non-instantiatable type `%s'",
4481 type_descriptive_name_I (instance->g_class->g_type));
4485 private_node = lookup_type_node_I (private_type);
4486 if (G_UNLIKELY (!private_node || !NODE_IS_ANCESTOR (private_node, instance_node)))
4488 g_warning ("attempt to retrieve private data for invalid type '%s'",
4489 type_descriptive_name_I (private_type));
4493 /* Note that we don't need a read lock, since instance existing
4494 * means that the instance class and all parent classes
4495 * exist, so the node->data, node->data->instance.instance_size,
4496 * and node->data->instance.private_size are not going to be changed.
4497 * for any of the relevant types.
4500 offset = ALIGN_STRUCT (instance_node->data->instance.instance_size);
4502 if (NODE_PARENT_TYPE (private_node))
4504 parent_node = lookup_type_node_I (NODE_PARENT_TYPE (private_node));
4505 g_assert (parent_node->data && NODE_REFCOUNT (parent_node) > 0);
4507 if (G_UNLIKELY (private_node->data->instance.private_size == parent_node->data->instance.private_size))
4509 g_warning ("g_type_instance_get_private() requires a prior call to g_type_class_add_private()");
4513 offset += ALIGN_STRUCT (parent_node->data->instance.private_size);
4516 return G_STRUCT_MEMBER_P (instance, offset);
4520 * g_type_add_class_private:
4521 * @class_type: GType of an classed type.
4522 * @private_size: size of private structure.
4524 * Registers a private class structure for a classed type;
4525 * when the class is allocated, the private structures for
4526 * the class and all of its parent types are allocated
4527 * sequentially in the same memory block as the public
4528 * structures. This function should be called in the
4529 * type's get_type() function after the type is registered.
4530 * The private structure can be retrieved using the
4531 * G_TYPE_CLASS_GET_PRIVATE() macro.
4536 g_type_add_class_private (GType class_type,
4539 TypeNode *node = lookup_type_node_I (class_type);
4542 g_return_if_fail (private_size > 0);
4544 if (!node || !node->is_classed || !node->data)
4546 g_warning ("cannot add class private field to invalid type '%s'",
4547 type_descriptive_name_I (class_type));
4551 if (NODE_PARENT_TYPE (node))
4553 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
4554 if (node->data->class.class_private_size != pnode->data->class.class_private_size)
4556 g_warning ("g_type_add_class_private() called multiple times for the same type");
4561 G_WRITE_LOCK (&type_rw_lock);
4563 offset = ALIGN_STRUCT (node->data->class.class_private_size);
4564 node->data->class.class_private_size = offset + private_size;
4566 G_WRITE_UNLOCK (&type_rw_lock);
4570 g_type_class_get_private (GTypeClass *klass,
4573 TypeNode *class_node;
4574 TypeNode *private_node;
4575 TypeNode *parent_node;
4578 g_return_val_if_fail (klass != NULL, NULL);
4580 class_node = lookup_type_node_I (klass->g_type);
4581 if (G_UNLIKELY (!class_node || !class_node->is_classed))
4583 g_warning ("class of invalid type `%s'",
4584 type_descriptive_name_I (klass->g_type));
4588 private_node = lookup_type_node_I (private_type);
4589 if (G_UNLIKELY (!private_node || !NODE_IS_ANCESTOR (private_node, class_node)))
4591 g_warning ("attempt to retrieve private data for invalid type '%s'",
4592 type_descriptive_name_I (private_type));
4596 offset = ALIGN_STRUCT (class_node->data->class.class_size);
4598 if (NODE_PARENT_TYPE (private_node))
4600 parent_node = lookup_type_node_I (NODE_PARENT_TYPE (private_node));
4601 g_assert (parent_node->data && NODE_REFCOUNT (parent_node) > 0);
4603 if (G_UNLIKELY (private_node->data->class.class_private_size == parent_node->data->class.class_private_size))
4605 g_warning ("g_type_instance_get_class_private() requires a prior call to g_type_class_add_class_private()");
4609 offset += ALIGN_STRUCT (parent_node->data->class.class_private_size);
4612 return G_STRUCT_MEMBER_P (klass, offset);
4615 #define __G_TYPE_C__
4616 #include "gobjectaliasdef.c"