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 "gatomicarray.h"
34 #include "gobject_trace.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 TRACE(GOBJECT_TYPE_NEW(name, node->supers[1], type));
487 node->plugin = plugin;
488 node->n_children = 0;
489 node->children = NULL;
491 node->qname = g_quark_from_string (name);
492 node->global_gdata = NULL;
494 g_hash_table_insert (static_type_nodes_ht,
495 GUINT_TO_POINTER (node->qname),
500 static inline GTypeFundamentalInfo*
501 type_node_fundamental_info_I (TypeNode *node)
503 GType ftype = NODE_FUNDAMENTAL_TYPE (node);
505 if (ftype != NODE_TYPE (node))
506 node = lookup_type_node_I (ftype);
508 return node ? G_STRUCT_MEMBER_P (node, -SIZEOF_FUNDAMENTAL_INFO) : NULL;
512 type_node_fundamental_new_W (GType ftype,
514 GTypeFundamentalFlags type_flags)
516 GTypeFundamentalInfo *finfo;
519 g_assert ((ftype & TYPE_ID_MASK) == 0);
520 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX);
522 if (ftype >> G_TYPE_FUNDAMENTAL_SHIFT == static_fundamental_next)
523 static_fundamental_next++;
525 type_flags &= TYPE_FUNDAMENTAL_FLAG_MASK;
527 node = type_node_any_new_W (NULL, ftype, name, NULL, type_flags);
529 finfo = type_node_fundamental_info_I (node);
530 finfo->type_flags = type_flags;
536 type_node_new_W (TypeNode *pnode,
542 g_assert (pnode->n_supers < MAX_N_SUPERS);
543 g_assert (pnode->n_children < MAX_N_CHILDREN);
545 return type_node_any_new_W (pnode, NODE_FUNDAMENTAL_TYPE (pnode), name, plugin, 0);
548 static inline IFaceEntry*
549 lookup_iface_entry_I (volatile IFaceEntries *entries,
550 TypeNode *iface_node)
561 G_ATOMIC_ARRAY_DO_TRANSACTION
562 (&iface_node->_prot.offsets, guint8,
565 offsets = transaction_data;
566 offset_index = entries->offset_index;
567 if (offsets != NULL &&
568 offset_index < G_ATOMIC_ARRAY_DATA_SIZE(offsets))
570 index = offsets[offset_index];
573 /* zero means unset, subtract one to get real index */
576 if (index < IFACE_ENTRIES_N_ENTRIES (entries))
578 check = (IFaceEntry *)&entries->entry[index];
579 if (check->iface_type == NODE_TYPE (iface_node))
589 static inline IFaceEntry*
590 type_lookup_iface_entry_L (TypeNode *node,
591 TypeNode *iface_node)
593 if (!NODE_IS_IFACE (iface_node))
596 return lookup_iface_entry_I (CLASSED_NODE_IFACES_ENTRIES_LOCKED (node),
601 static inline gboolean
602 type_lookup_iface_vtable_I (TypeNode *node,
603 TypeNode *iface_node,
604 gpointer *vtable_ptr)
609 if (!NODE_IS_IFACE (iface_node))
616 G_ATOMIC_ARRAY_DO_TRANSACTION
617 (CLASSED_NODE_IFACES_ENTRIES (node), IFaceEntries,
619 entry = lookup_iface_entry_I (transaction_data, iface_node);
624 *vtable_ptr = entry->vtable;
633 static inline gboolean
634 type_lookup_prerequisite_L (TypeNode *iface,
635 GType prerequisite_type)
637 if (NODE_IS_IFACE (iface) && IFACE_NODE_N_PREREQUISITES (iface))
639 GType *prerequisites = IFACE_NODE_PREREQUISITES (iface) - 1;
640 guint n_prerequisites = IFACE_NODE_N_PREREQUISITES (iface);
647 i = (n_prerequisites + 1) >> 1;
648 check = prerequisites + i;
649 if (prerequisite_type == *check)
651 else if (prerequisite_type > *check)
653 n_prerequisites -= i;
654 prerequisites = check;
656 else /* if (prerequisite_type < *check) */
657 n_prerequisites = i - 1;
659 while (n_prerequisites);
665 type_descriptive_name_I (GType type)
669 TypeNode *node = lookup_type_node_I (type);
671 return node ? NODE_NAME (node) : "<unknown>";
678 /* --- type consistency checks --- */
680 check_plugin_U (GTypePlugin *plugin,
681 gboolean need_complete_type_info,
682 gboolean need_complete_interface_info,
683 const gchar *type_name)
685 /* G_IS_TYPE_PLUGIN() and G_TYPE_PLUGIN_GET_CLASS() are external calls: _U
689 g_warning ("plugin handle for type `%s' is NULL",
693 if (!G_IS_TYPE_PLUGIN (plugin))
695 g_warning ("plugin pointer (%p) for type `%s' is invalid",
699 if (need_complete_type_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_type_info)
701 g_warning ("plugin for type `%s' has no complete_type_info() implementation",
705 if (need_complete_interface_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_interface_info)
707 g_warning ("plugin for type `%s' has no complete_interface_info() implementation",
715 check_type_name_I (const gchar *type_name)
717 static const gchar extra_chars[] = "-_+";
718 const gchar *p = type_name;
721 if (!type_name[0] || !type_name[1] || !type_name[2])
723 g_warning ("type name `%s' is too short", type_name);
726 /* check the first letter */
727 name_valid = (p[0] >= 'A' && p[0] <= 'Z') || (p[0] >= 'a' && p[0] <= 'z') || p[0] == '_';
728 for (p = type_name + 1; *p; p++)
729 name_valid &= ((p[0] >= 'A' && p[0] <= 'Z') ||
730 (p[0] >= 'a' && p[0] <= 'z') ||
731 (p[0] >= '0' && p[0] <= '9') ||
732 strchr (extra_chars, p[0]));
735 g_warning ("type name `%s' contains invalid characters", type_name);
738 if (g_type_from_name (type_name))
740 g_warning ("cannot register existing type `%s'", type_name);
748 check_derivation_I (GType parent_type,
749 const gchar *type_name)
752 GTypeFundamentalInfo* finfo;
754 pnode = lookup_type_node_I (parent_type);
757 g_warning ("cannot derive type `%s' from invalid parent type `%s'",
759 type_descriptive_name_I (parent_type));
762 finfo = type_node_fundamental_info_I (pnode);
763 /* ensure flat derivability */
764 if (!(finfo->type_flags & G_TYPE_FLAG_DERIVABLE))
766 g_warning ("cannot derive `%s' from non-derivable parent type `%s'",
771 /* ensure deep derivability */
772 if (parent_type != NODE_FUNDAMENTAL_TYPE (pnode) &&
773 !(finfo->type_flags & G_TYPE_FLAG_DEEP_DERIVABLE))
775 g_warning ("cannot derive `%s' from non-fundamental parent type `%s'",
785 check_collect_format_I (const gchar *collect_format)
787 const gchar *p = collect_format;
788 gchar valid_format[] = { G_VALUE_COLLECT_INT, G_VALUE_COLLECT_LONG,
789 G_VALUE_COLLECT_INT64, G_VALUE_COLLECT_DOUBLE,
790 G_VALUE_COLLECT_POINTER, 0 };
793 if (!strchr (valid_format, *p++))
795 return p - collect_format <= G_VALUE_COLLECT_FORMAT_MAX_LENGTH;
799 check_value_table_I (const gchar *type_name,
800 const GTypeValueTable *value_table)
804 else if (value_table->value_init == NULL)
806 if (value_table->value_free || value_table->value_copy ||
807 value_table->value_peek_pointer ||
808 value_table->collect_format || value_table->collect_value ||
809 value_table->lcopy_format || value_table->lcopy_value)
810 g_warning ("cannot handle uninitializable values of type `%s'",
814 else /* value_table->value_init != NULL */
816 if (!value_table->value_free)
819 * g_warning ("missing `value_free()' for type `%s'", type_name);
823 if (!value_table->value_copy)
825 g_warning ("missing `value_copy()' for type `%s'", type_name);
828 if ((value_table->collect_format || value_table->collect_value) &&
829 (!value_table->collect_format || !value_table->collect_value))
831 g_warning ("one of `collect_format' and `collect_value()' is unspecified for type `%s'",
835 if (value_table->collect_format && !check_collect_format_I (value_table->collect_format))
837 g_warning ("the `%s' specification for type `%s' is too long or invalid",
842 if ((value_table->lcopy_format || value_table->lcopy_value) &&
843 (!value_table->lcopy_format || !value_table->lcopy_value))
845 g_warning ("one of `lcopy_format' and `lcopy_value()' is unspecified for type `%s'",
849 if (value_table->lcopy_format && !check_collect_format_I (value_table->lcopy_format))
851 g_warning ("the `%s' specification for type `%s' is too long or invalid",
861 check_type_info_I (TypeNode *pnode,
863 const gchar *type_name,
864 const GTypeInfo *info)
866 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (lookup_type_node_I (ftype));
867 gboolean is_interface = ftype == G_TYPE_INTERFACE;
869 g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX && !(ftype & TYPE_ID_MASK));
871 /* check instance members */
872 if (!(finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
873 (info->instance_size || info->n_preallocs || info->instance_init))
876 g_warning ("cannot instantiate `%s', derived from non-instantiatable parent type `%s'",
880 g_warning ("cannot instantiate `%s' as non-instantiatable fundamental",
884 /* check class & interface members */
885 if (!((finfo->type_flags & G_TYPE_FLAG_CLASSED) || is_interface) &&
886 (info->class_init || info->class_finalize || info->class_data ||
887 info->class_size || info->base_init || info->base_finalize))
890 g_warning ("cannot create class for `%s', derived from non-classed parent type `%s'",
894 g_warning ("cannot create class for `%s' as non-classed fundamental",
898 /* check interface size */
899 if (is_interface && info->class_size < sizeof (GTypeInterface))
901 g_warning ("specified interface size for type `%s' is smaller than `GTypeInterface' size",
905 /* check class size */
906 if (finfo->type_flags & G_TYPE_FLAG_CLASSED)
908 if (info->class_size < sizeof (GTypeClass))
910 g_warning ("specified class size for type `%s' is smaller than `GTypeClass' size",
914 if (pnode && info->class_size < pnode->data->class.class_size)
916 g_warning ("specified class size for type `%s' is smaller "
917 "than the parent type's `%s' class size",
923 /* check instance size */
924 if (finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE)
926 if (info->instance_size < sizeof (GTypeInstance))
928 g_warning ("specified instance size for type `%s' is smaller than `GTypeInstance' size",
932 if (pnode && info->instance_size < pnode->data->instance.instance_size)
934 g_warning ("specified instance size for type `%s' is smaller "
935 "than the parent type's `%s' instance size",
946 find_conforming_child_type_L (TypeNode *pnode,
949 TypeNode *node = NULL;
952 if (type_lookup_iface_entry_L (pnode, iface))
955 for (i = 0; i < pnode->n_children && !node; i++)
956 node = find_conforming_child_type_L (lookup_type_node_I (pnode->children[i]), iface);
962 check_add_interface_L (GType instance_type,
965 TypeNode *node = lookup_type_node_I (instance_type);
966 TypeNode *iface = lookup_type_node_I (iface_type);
969 GType *prerequisites;
973 if (!node || !node->is_instantiatable)
975 g_warning ("cannot add interfaces to invalid (non-instantiatable) type `%s'",
976 type_descriptive_name_I (instance_type));
979 if (!iface || !NODE_IS_IFACE (iface))
981 g_warning ("cannot add invalid (non-interface) type `%s' to type `%s'",
982 type_descriptive_name_I (iface_type),
986 tnode = lookup_type_node_I (NODE_PARENT_TYPE (iface));
987 if (NODE_PARENT_TYPE (tnode) && !type_lookup_iface_entry_L (node, tnode))
989 /* 2001/7/31:timj: erk, i guess this warning is junk as interface derivation is flat */
990 g_warning ("cannot add sub-interface `%s' to type `%s' which does not conform to super-interface `%s'",
996 /* allow overriding of interface type introduced for parent type */
997 entry = type_lookup_iface_entry_L (node, iface);
998 if (entry && entry->vtable == NULL && !type_iface_peek_holder_L (iface, NODE_TYPE (node)))
1000 /* ok, we do conform to this interface already, but the interface vtable was not
1001 * yet intialized, and we just conform to the interface because it got added to
1002 * one of our parents. so we allow overriding of holder info here.
1006 /* check whether one of our children already conforms (or whether the interface
1007 * got added to this node already)
1009 tnode = find_conforming_child_type_L (node, iface); /* tnode is_a node */
1012 g_warning ("cannot add interface type `%s' to type `%s', since type `%s' already conforms to interface",
1018 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1019 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1021 tnode = lookup_type_node_I (prerequisites[i]);
1022 if (!type_node_is_a_L (node, tnode))
1024 g_warning ("cannot add interface type `%s' to type `%s' which does not conform to prerequisite `%s'",
1035 check_interface_info_I (TypeNode *iface,
1036 GType instance_type,
1037 const GInterfaceInfo *info)
1039 if ((info->interface_finalize || info->interface_data) && !info->interface_init)
1041 g_warning ("interface type `%s' for type `%s' comes without initializer",
1043 type_descriptive_name_I (instance_type));
1050 /* --- type info (type node data) --- */
1052 type_data_make_W (TypeNode *node,
1053 const GTypeInfo *info,
1054 const GTypeValueTable *value_table)
1057 GTypeValueTable *vtable = NULL;
1058 guint vtable_size = 0;
1060 g_assert (node->data == NULL && info != NULL);
1064 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1067 vtable = pnode->data->common.value_table;
1070 static const GTypeValueTable zero_vtable = { NULL, };
1072 value_table = &zero_vtable;
1077 /* need to setup vtable_size since we have to allocate it with data in one chunk */
1078 vtable_size = sizeof (GTypeValueTable);
1079 if (value_table->collect_format)
1080 vtable_size += strlen (value_table->collect_format);
1081 if (value_table->lcopy_format)
1082 vtable_size += strlen (value_table->lcopy_format);
1086 if (node->is_instantiatable) /* carefull, is_instantiatable is also is_classed */
1088 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1090 data = g_malloc0 (sizeof (InstanceData) + vtable_size);
1092 vtable = G_STRUCT_MEMBER_P (data, sizeof (InstanceData));
1093 data->instance.class_size = info->class_size;
1094 data->instance.class_init_base = info->base_init;
1095 data->instance.class_finalize_base = info->base_finalize;
1096 data->instance.class_init = info->class_init;
1097 data->instance.class_finalize = info->class_finalize;
1098 data->instance.class_data = info->class_data;
1099 data->instance.class = NULL;
1100 data->instance.init_state = UNINITIALIZED;
1101 data->instance.instance_size = info->instance_size;
1102 /* We'll set the final value for data->instance.private size
1103 * after the parent class has been initialized
1105 data->instance.private_size = 0;
1106 data->instance.class_private_size = 0;
1108 data->instance.class_private_size = pnode->data->instance.class_private_size;
1109 #ifdef DISABLE_MEM_POOLS
1110 data->instance.n_preallocs = 0;
1111 #else /* !DISABLE_MEM_POOLS */
1112 data->instance.n_preallocs = MIN (info->n_preallocs, 1024);
1113 #endif /* !DISABLE_MEM_POOLS */
1114 data->instance.instance_init = info->instance_init;
1116 else if (node->is_classed) /* only classed */
1118 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1120 data = g_malloc0 (sizeof (ClassData) + vtable_size);
1122 vtable = G_STRUCT_MEMBER_P (data, sizeof (ClassData));
1123 data->class.class_size = info->class_size;
1124 data->class.class_init_base = info->base_init;
1125 data->class.class_finalize_base = info->base_finalize;
1126 data->class.class_init = info->class_init;
1127 data->class.class_finalize = info->class_finalize;
1128 data->class.class_data = info->class_data;
1129 data->class.class = NULL;
1130 data->class.class_private_size = 0;
1132 data->class.class_private_size = pnode->data->class.class_private_size;
1133 data->class.init_state = UNINITIALIZED;
1135 else if (NODE_IS_IFACE (node))
1137 data = g_malloc0 (sizeof (IFaceData) + vtable_size);
1139 vtable = G_STRUCT_MEMBER_P (data, sizeof (IFaceData));
1140 data->iface.vtable_size = info->class_size;
1141 data->iface.vtable_init_base = info->base_init;
1142 data->iface.vtable_finalize_base = info->base_finalize;
1143 data->iface.dflt_init = info->class_init;
1144 data->iface.dflt_finalize = info->class_finalize;
1145 data->iface.dflt_data = info->class_data;
1146 data->iface.dflt_vtable = NULL;
1148 else if (NODE_IS_BOXED (node))
1150 data = g_malloc0 (sizeof (BoxedData) + vtable_size);
1152 vtable = G_STRUCT_MEMBER_P (data, sizeof (BoxedData));
1156 data = g_malloc0 (sizeof (CommonData) + vtable_size);
1158 vtable = G_STRUCT_MEMBER_P (data, sizeof (CommonData));
1167 /* we allocate the vtable and its strings together with the type data, so
1168 * children can take over their parent's vtable pointer, and we don't
1169 * need to worry freeing it or not when the child data is destroyed
1171 *vtable = *value_table;
1172 p = G_STRUCT_MEMBER_P (vtable, sizeof (*vtable));
1174 vtable->collect_format = p;
1175 if (value_table->collect_format)
1177 strcat (p, value_table->collect_format);
1178 p += strlen (value_table->collect_format);
1182 vtable->lcopy_format = p;
1183 if (value_table->lcopy_format)
1184 strcat (p, value_table->lcopy_format);
1186 node->data->common.value_table = vtable;
1187 node->mutatable_check_cache = (node->data->common.value_table->value_init != NULL &&
1188 !((G_TYPE_FLAG_VALUE_ABSTRACT | G_TYPE_FLAG_ABSTRACT) &
1189 GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))));
1191 g_assert (node->data->common.value_table != NULL); /* paranoid */
1193 g_atomic_int_set ((int *) &node->ref_count, 1);
1197 type_data_ref_Wm (TypeNode *node)
1201 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1203 GTypeValueTable tmp_value_table;
1205 g_assert (node->plugin != NULL);
1209 type_data_ref_Wm (pnode);
1211 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
1214 memset (&tmp_info, 0, sizeof (tmp_info));
1215 memset (&tmp_value_table, 0, sizeof (tmp_value_table));
1217 G_WRITE_UNLOCK (&type_rw_lock);
1218 g_type_plugin_use (node->plugin);
1219 g_type_plugin_complete_type_info (node->plugin, NODE_TYPE (node), &tmp_info, &tmp_value_table);
1220 G_WRITE_LOCK (&type_rw_lock);
1222 INVALID_RECURSION ("g_type_plugin_*", node->plugin, NODE_NAME (node));
1224 check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (node), NODE_NAME (node), &tmp_info);
1225 type_data_make_W (node, &tmp_info,
1226 check_value_table_I (NODE_NAME (node),
1227 &tmp_value_table) ? &tmp_value_table : NULL);
1231 g_assert (NODE_REFCOUNT (node) > 0);
1233 g_atomic_int_inc ((int *) &node->ref_count);
1237 static inline gboolean
1238 type_data_ref_U (TypeNode *node)
1243 current = NODE_REFCOUNT (node);
1247 } while (!g_atomic_int_compare_and_exchange ((int *) &node->ref_count, current, current + 1));
1253 iface_node_has_available_offset_L (TypeNode *iface_node,
1259 offsets = G_ATOMIC_ARRAY_GET_LOCKED (&iface_node->_prot.offsets, guint8);
1260 if (offsets == NULL)
1263 if (G_ATOMIC_ARRAY_DATA_SIZE (offsets) <= offset)
1266 if (offsets[offset] == 0 ||
1267 offsets[offset] == for_index+1)
1274 find_free_iface_offset_L (IFaceEntries *entries)
1277 TypeNode *iface_node;
1282 n_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1287 for (i = 0; i < n_entries; i++)
1289 entry = &entries->entry[i];
1290 iface_node = lookup_type_node_I (entry->iface_type);
1292 if (!iface_node_has_available_offset_L (iface_node, offset, i))
1296 while (i != n_entries);
1302 iface_node_set_offset_L (TypeNode *iface_node,
1306 guint8 *offsets, *old_offsets;
1307 int new_size, old_size;
1310 old_offsets = G_ATOMIC_ARRAY_GET_LOCKED (&iface_node->_prot.offsets, guint8);
1311 if (old_offsets == NULL)
1315 old_size = G_ATOMIC_ARRAY_DATA_SIZE (old_offsets);
1316 if (offset < old_size &&
1317 old_offsets[offset] == index + 1)
1318 return; /* Already set to this index, return */
1320 new_size = MAX (old_size, offset + 1);
1322 offsets = _g_atomic_array_copy (&iface_node->_prot.offsets,
1323 0, new_size - old_size);
1325 /* Mark new area as unused */
1326 for (i = old_size; i < new_size; i++)
1329 offsets[offset] = index + 1;
1331 _g_atomic_array_update (&iface_node->_prot.offsets, offsets);
1335 type_node_add_iface_entry_W (TypeNode *node,
1337 IFaceEntry *parent_entry)
1339 IFaceEntries *entries;
1341 TypeNode *iface_node;
1345 g_assert (node->is_instantiatable);
1347 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
1348 if (entries != NULL)
1350 num_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1352 g_assert (num_entries < MAX_N_INTERFACES);
1354 for (i = 0; i < num_entries; i++)
1356 entry = &entries->entry[i];
1357 if (entry->iface_type == iface_type)
1359 /* this can happen in two cases:
1360 * - our parent type already conformed to iface_type and node
1361 * got its own holder info. here, our children already have
1362 * entries and NULL vtables, since this will only work for
1363 * uninitialized classes.
1364 * - an interface type is added to an ancestor after it was
1365 * added to a child type.
1368 g_assert (entry->vtable == NULL && entry->init_state == UNINITIALIZED);
1371 /* sick, interface is added to ancestor *after* child type;
1372 * nothing todo, the entry and our children were already setup correctly
1380 entries = _g_atomic_array_copy (CLASSED_NODE_IFACES_ENTRIES (node),
1381 IFACE_ENTRIES_HEADER_SIZE,
1382 sizeof (IFaceEntry));
1383 num_entries = IFACE_ENTRIES_N_ENTRIES (entries);
1384 i = num_entries - 1;
1386 entries->offset_index = 0;
1387 entries->entry[i].iface_type = iface_type;
1388 entries->entry[i].vtable = NULL;
1389 entries->entry[i].init_state = UNINITIALIZED;
1393 if (node->data && node->data->class.init_state >= BASE_IFACE_INIT)
1395 entries->entry[i].init_state = INITIALIZED;
1396 entries->entry[i].vtable = parent_entry->vtable;
1400 /* Update offsets in iface */
1401 iface_node = lookup_type_node_I (iface_type);
1403 if (iface_node_has_available_offset_L (iface_node,
1404 entries->offset_index,
1407 iface_node_set_offset_L (iface_node,
1408 entries->offset_index, i);
1412 entries->offset_index =
1413 find_free_iface_offset_L (entries);
1414 for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (entries); j++)
1416 entry = &entries->entry[j];
1418 lookup_type_node_I (entry->iface_type);
1419 iface_node_set_offset_L (iface_node,
1420 entries->offset_index, j);
1424 _g_atomic_array_update (CLASSED_NODE_IFACES_ENTRIES (node), entries);
1428 for (i = 0; i < node->n_children; i++)
1429 type_node_add_iface_entry_W (lookup_type_node_I (node->children[i]), iface_type, &entries->entry[i]);
1434 type_add_interface_Wm (TypeNode *node,
1436 const GInterfaceInfo *info,
1437 GTypePlugin *plugin)
1439 IFaceHolder *iholder = g_new0 (IFaceHolder, 1);
1443 g_assert (node->is_instantiatable && NODE_IS_IFACE (iface) && ((info && !plugin) || (!info && plugin)));
1445 iholder->next = iface_node_get_holders_L (iface);
1446 iface_node_set_holders_W (iface, iholder);
1447 iholder->instance_type = NODE_TYPE (node);
1448 iholder->info = info ? g_memdup (info, sizeof (*info)) : NULL;
1449 iholder->plugin = plugin;
1451 /* create an iface entry for this type */
1452 type_node_add_iface_entry_W (node, NODE_TYPE (iface), NULL);
1454 /* if the class is already (partly) initialized, we may need to base
1455 * initalize and/or initialize the new interface.
1459 InitState class_state = node->data->class.init_state;
1461 if (class_state >= BASE_IFACE_INIT)
1462 type_iface_vtable_base_init_Wm (iface, node);
1464 if (class_state >= IFACE_INIT)
1465 type_iface_vtable_iface_init_Wm (iface, node);
1468 /* create iface entries for children of this type */
1469 entry = type_lookup_iface_entry_L (node, iface);
1470 for (i = 0; i < node->n_children; i++)
1471 type_node_add_iface_entry_W (lookup_type_node_I (node->children[i]), NODE_TYPE (iface), entry);
1475 type_iface_add_prerequisite_W (TypeNode *iface,
1476 TypeNode *prerequisite_node)
1478 GType prerequisite_type = NODE_TYPE (prerequisite_node);
1479 GType *prerequisites, *dependants;
1480 guint n_dependants, i;
1482 g_assert (NODE_IS_IFACE (iface) &&
1483 IFACE_NODE_N_PREREQUISITES (iface) < MAX_N_PREREQUISITES &&
1484 (prerequisite_node->is_instantiatable || NODE_IS_IFACE (prerequisite_node)));
1486 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1487 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1488 if (prerequisites[i] == prerequisite_type)
1489 return; /* we already have that prerequisiste */
1490 else if (prerequisites[i] > prerequisite_type)
1492 IFACE_NODE_N_PREREQUISITES (iface) += 1;
1493 IFACE_NODE_PREREQUISITES (iface) = g_renew (GType,
1494 IFACE_NODE_PREREQUISITES (iface),
1495 IFACE_NODE_N_PREREQUISITES (iface));
1496 prerequisites = IFACE_NODE_PREREQUISITES (iface);
1497 g_memmove (prerequisites + i + 1, prerequisites + i,
1498 sizeof (prerequisites[0]) * (IFACE_NODE_N_PREREQUISITES (iface) - i - 1));
1499 prerequisites[i] = prerequisite_type;
1501 /* we want to get notified when prerequisites get added to prerequisite_node */
1502 if (NODE_IS_IFACE (prerequisite_node))
1504 dependants = iface_node_get_dependants_array_L (prerequisite_node);
1505 n_dependants = dependants ? dependants[0] : 0;
1507 dependants = g_renew (GType, dependants, n_dependants + 1);
1508 dependants[n_dependants] = NODE_TYPE (iface);
1509 dependants[0] = n_dependants;
1510 iface_node_set_dependants_array_W (prerequisite_node, dependants);
1513 /* we need to notify all dependants */
1514 dependants = iface_node_get_dependants_array_L (iface);
1515 n_dependants = dependants ? dependants[0] : 0;
1516 for (i = 1; i <= n_dependants; i++)
1517 type_iface_add_prerequisite_W (lookup_type_node_I (dependants[i]), prerequisite_node);
1521 * g_type_interface_add_prerequisite:
1522 * @interface_type: #GType value of an interface type.
1523 * @prerequisite_type: #GType value of an interface or instantiatable type.
1525 * Adds @prerequisite_type to the list of prerequisites of @interface_type.
1526 * This means that any type implementing @interface_type must also implement
1527 * @prerequisite_type. Prerequisites can be thought of as an alternative to
1528 * interface derivation (which GType doesn't support). An interface can have
1529 * at most one instantiatable prerequisite type.
1532 g_type_interface_add_prerequisite (GType interface_type,
1533 GType prerequisite_type)
1535 TypeNode *iface, *prerequisite_node;
1536 IFaceHolder *holders;
1538 g_return_if_fail (G_TYPE_IS_INTERFACE (interface_type)); /* G_TYPE_IS_INTERFACE() is an external call: _U */
1539 g_return_if_fail (!g_type_is_a (interface_type, prerequisite_type));
1540 g_return_if_fail (!g_type_is_a (prerequisite_type, interface_type));
1542 iface = lookup_type_node_I (interface_type);
1543 prerequisite_node = lookup_type_node_I (prerequisite_type);
1544 if (!iface || !prerequisite_node || !NODE_IS_IFACE (iface))
1546 g_warning ("interface type `%s' or prerequisite type `%s' invalid",
1547 type_descriptive_name_I (interface_type),
1548 type_descriptive_name_I (prerequisite_type));
1551 G_WRITE_LOCK (&type_rw_lock);
1552 holders = iface_node_get_holders_L (iface);
1555 G_WRITE_UNLOCK (&type_rw_lock);
1556 g_warning ("unable to add prerequisite `%s' to interface `%s' which is already in use for `%s'",
1557 type_descriptive_name_I (prerequisite_type),
1558 type_descriptive_name_I (interface_type),
1559 type_descriptive_name_I (holders->instance_type));
1562 if (prerequisite_node->is_instantiatable)
1566 /* can have at most one publically installable instantiatable prerequisite */
1567 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1569 TypeNode *prnode = lookup_type_node_I (IFACE_NODE_PREREQUISITES (iface)[i]);
1571 if (prnode->is_instantiatable)
1573 G_WRITE_UNLOCK (&type_rw_lock);
1574 g_warning ("adding prerequisite `%s' to interface `%s' conflicts with existing prerequisite `%s'",
1575 type_descriptive_name_I (prerequisite_type),
1576 type_descriptive_name_I (interface_type),
1577 type_descriptive_name_I (NODE_TYPE (prnode)));
1582 for (i = 0; i < prerequisite_node->n_supers + 1; i++)
1583 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisite_node->supers[i]));
1584 G_WRITE_UNLOCK (&type_rw_lock);
1586 else if (NODE_IS_IFACE (prerequisite_node))
1588 GType *prerequisites;
1591 prerequisites = IFACE_NODE_PREREQUISITES (prerequisite_node);
1592 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (prerequisite_node); i++)
1593 type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisites[i]));
1594 type_iface_add_prerequisite_W (iface, prerequisite_node);
1595 G_WRITE_UNLOCK (&type_rw_lock);
1599 G_WRITE_UNLOCK (&type_rw_lock);
1600 g_warning ("prerequisite `%s' for interface `%s' is neither instantiatable nor interface",
1601 type_descriptive_name_I (prerequisite_type),
1602 type_descriptive_name_I (interface_type));
1607 * g_type_interface_prerequisites:
1608 * @interface_type: an interface type
1609 * @n_prerequisites: location to return the number of prerequisites, or %NULL
1611 * Returns the prerequisites of an interfaces type.
1615 * Returns: a newly-allocated zero-terminated array of #GType containing
1616 * the prerequisites of @interface_type
1619 g_type_interface_prerequisites (GType interface_type,
1620 guint *n_prerequisites)
1624 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL);
1626 iface = lookup_type_node_I (interface_type);
1630 TypeNode *inode = NULL;
1633 G_READ_LOCK (&type_rw_lock);
1634 types = g_new0 (GType, IFACE_NODE_N_PREREQUISITES (iface) + 1);
1635 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (iface); i++)
1637 GType prerequisite = IFACE_NODE_PREREQUISITES (iface)[i];
1638 TypeNode *node = lookup_type_node_I (prerequisite);
1639 if (node->is_instantiatable)
1641 if (!inode || type_node_is_a_L (node, inode))
1645 types[n++] = NODE_TYPE (node);
1648 types[n++] = NODE_TYPE (inode);
1650 if (n_prerequisites)
1651 *n_prerequisites = n;
1652 G_READ_UNLOCK (&type_rw_lock);
1658 if (n_prerequisites)
1659 *n_prerequisites = 0;
1667 type_iface_peek_holder_L (TypeNode *iface,
1668 GType instance_type)
1670 IFaceHolder *iholder;
1672 g_assert (NODE_IS_IFACE (iface));
1674 iholder = iface_node_get_holders_L (iface);
1675 while (iholder && iholder->instance_type != instance_type)
1676 iholder = iholder->next;
1681 type_iface_retrieve_holder_info_Wm (TypeNode *iface,
1682 GType instance_type,
1685 IFaceHolder *iholder = type_iface_peek_holder_L (iface, instance_type);
1687 if (iholder && !iholder->info && need_info)
1689 GInterfaceInfo tmp_info;
1691 g_assert (iholder->plugin != NULL);
1693 type_data_ref_Wm (iface);
1695 INVALID_RECURSION ("g_type_plugin_*", iface->plugin, NODE_NAME (iface));
1697 memset (&tmp_info, 0, sizeof (tmp_info));
1699 G_WRITE_UNLOCK (&type_rw_lock);
1700 g_type_plugin_use (iholder->plugin);
1701 g_type_plugin_complete_interface_info (iholder->plugin, instance_type, NODE_TYPE (iface), &tmp_info);
1702 G_WRITE_LOCK (&type_rw_lock);
1704 INVALID_RECURSION ("g_type_plugin_*", iholder->plugin, NODE_NAME (iface));
1706 check_interface_info_I (iface, instance_type, &tmp_info);
1707 iholder->info = g_memdup (&tmp_info, sizeof (tmp_info));
1710 return iholder; /* we don't modify write lock upon returning NULL */
1714 type_iface_blow_holder_info_Wm (TypeNode *iface,
1715 GType instance_type)
1717 IFaceHolder *iholder = iface_node_get_holders_L (iface);
1719 g_assert (NODE_IS_IFACE (iface));
1721 while (iholder->instance_type != instance_type)
1722 iholder = iholder->next;
1724 if (iholder->info && iholder->plugin)
1726 g_free (iholder->info);
1727 iholder->info = NULL;
1729 G_WRITE_UNLOCK (&type_rw_lock);
1730 g_type_plugin_unuse (iholder->plugin);
1731 type_data_unref_U (iface, FALSE);
1732 G_WRITE_LOCK (&type_rw_lock);
1736 /* Assumes type's class already exists
1738 static inline size_t
1739 type_total_instance_size_I (TypeNode *node)
1741 gsize total_instance_size;
1743 total_instance_size = node->data->instance.instance_size;
1744 if (node->data->instance.private_size != 0)
1745 total_instance_size = ALIGN_STRUCT (total_instance_size) + node->data->instance.private_size;
1747 return total_instance_size;
1750 /* --- type structure creation/destruction --- */
1754 } InstanceRealClass;
1757 instance_real_class_cmp (gconstpointer p1,
1760 const InstanceRealClass *irc1 = p1;
1761 const InstanceRealClass *irc2 = p2;
1762 guint8 *i1 = irc1->instance;
1763 guint8 *i2 = irc2->instance;
1764 return G_BSEARCH_ARRAY_CMP (i1, i2);
1767 G_LOCK_DEFINE_STATIC (instance_real_class);
1768 static GBSearchArray *instance_real_class_bsa = NULL;
1769 static GBSearchConfig instance_real_class_bconfig = {
1770 sizeof (InstanceRealClass),
1771 instance_real_class_cmp,
1776 instance_real_class_set (gpointer instance,
1779 InstanceRealClass key;
1780 key.instance = instance;
1782 G_LOCK (instance_real_class);
1783 if (!instance_real_class_bsa)
1784 instance_real_class_bsa = g_bsearch_array_create (&instance_real_class_bconfig);
1785 instance_real_class_bsa = g_bsearch_array_replace (instance_real_class_bsa, &instance_real_class_bconfig, &key);
1786 G_UNLOCK (instance_real_class);
1790 instance_real_class_remove (gpointer instance)
1792 InstanceRealClass key, *node;
1794 key.instance = instance;
1795 G_LOCK (instance_real_class);
1796 node = g_bsearch_array_lookup (instance_real_class_bsa, &instance_real_class_bconfig, &key);
1797 index = g_bsearch_array_get_index (instance_real_class_bsa, &instance_real_class_bconfig, node);
1798 instance_real_class_bsa = g_bsearch_array_remove (instance_real_class_bsa, &instance_real_class_bconfig, index);
1799 if (!g_bsearch_array_get_n_nodes (instance_real_class_bsa))
1801 g_bsearch_array_free (instance_real_class_bsa, &instance_real_class_bconfig);
1802 instance_real_class_bsa = NULL;
1804 G_UNLOCK (instance_real_class);
1807 static inline GTypeClass*
1808 instance_real_class_get (gpointer instance)
1810 InstanceRealClass key, *node;
1812 key.instance = instance;
1813 G_LOCK (instance_real_class);
1814 node = instance_real_class_bsa ? g_bsearch_array_lookup (instance_real_class_bsa, &instance_real_class_bconfig, &key) : NULL;
1815 class = node ? node->class : NULL;
1816 G_UNLOCK (instance_real_class);
1821 * g_type_create_instance:
1822 * @type: An instantiatable type to create an instance for.
1824 * Creates and initializes an instance of @type if @type is valid and
1825 * can be instantiated. The type system only performs basic allocation
1826 * and structure setups for instances: actual instance creation should
1827 * happen through functions supplied by the type's fundamental type
1828 * implementation. So use of g_type_create_instance() is reserved for
1829 * implementators of fundamental types only. E.g. instances of the
1830 * #GObject hierarchy should be created via g_object_new() and
1831 * <emphasis>never</emphasis> directly through
1832 * g_type_create_instance() which doesn't handle things like singleton
1833 * objects or object construction. Note: Do <emphasis>not</emphasis>
1834 * use this function, unless you're implementing a fundamental
1835 * type. Also language bindings should <emphasis>not</emphasis> use
1836 * this function but g_object_new() instead.
1838 * Returns: An allocated and initialized instance, subject to further
1839 * treatment by the fundamental type implementation.
1842 g_type_create_instance (GType type)
1845 GTypeInstance *instance;
1847 guint i, total_size;
1849 node = lookup_type_node_I (type);
1850 if (!node || !node->is_instantiatable)
1852 g_warning ("cannot create new instance of invalid (non-instantiatable) type `%s'",
1853 type_descriptive_name_I (type));
1856 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1857 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (type))
1859 g_warning ("cannot create instance of abstract (non-instantiatable) type `%s'",
1860 type_descriptive_name_I (type));
1864 class = g_type_class_ref (type);
1865 total_size = type_total_instance_size_I (node);
1867 instance = g_slice_alloc0 (total_size);
1869 if (node->data->instance.private_size)
1870 instance_real_class_set (instance, class);
1871 for (i = node->n_supers; i > 0; i--)
1875 pnode = lookup_type_node_I (node->supers[i]);
1876 if (pnode->data->instance.instance_init)
1878 instance->g_class = pnode->data->instance.class;
1879 pnode->data->instance.instance_init (instance, class);
1882 if (node->data->instance.private_size)
1883 instance_real_class_remove (instance);
1885 instance->g_class = class;
1886 if (node->data->instance.instance_init)
1887 node->data->instance.instance_init (instance, class);
1889 TRACE(GOBJECT_OBJECT_NEW(instance, type));
1895 * g_type_free_instance:
1896 * @instance: an instance of a type.
1898 * Frees an instance of a type, returning it to the instance pool for
1899 * the type, if there is one.
1901 * Like g_type_create_instance(), this function is reserved for
1902 * implementors of fundamental types.
1905 g_type_free_instance (GTypeInstance *instance)
1910 g_return_if_fail (instance != NULL && instance->g_class != NULL);
1912 class = instance->g_class;
1913 node = lookup_type_node_I (class->g_type);
1914 if (!node || !node->is_instantiatable || !node->data || node->data->class.class != (gpointer) class)
1916 g_warning ("cannot free instance of invalid (non-instantiatable) type `%s'",
1917 type_descriptive_name_I (class->g_type));
1920 /* G_TYPE_IS_ABSTRACT() is an external call: _U */
1921 if (!node->mutatable_check_cache && G_TYPE_IS_ABSTRACT (NODE_TYPE (node)))
1923 g_warning ("cannot free instance of abstract (non-instantiatable) type `%s'",
1928 instance->g_class = NULL;
1929 #ifdef G_ENABLE_DEBUG
1930 memset (instance, 0xaa, type_total_instance_size_I (node));
1932 g_slice_free1 (type_total_instance_size_I (node), instance);
1934 g_type_class_unref (class);
1938 type_iface_ensure_dflt_vtable_Wm (TypeNode *iface)
1940 g_assert (iface->data);
1942 if (!iface->data->iface.dflt_vtable)
1944 GTypeInterface *vtable = g_malloc0 (iface->data->iface.vtable_size);
1945 iface->data->iface.dflt_vtable = vtable;
1946 vtable->g_type = NODE_TYPE (iface);
1947 vtable->g_instance_type = 0;
1948 if (iface->data->iface.vtable_init_base ||
1949 iface->data->iface.dflt_init)
1951 G_WRITE_UNLOCK (&type_rw_lock);
1952 if (iface->data->iface.vtable_init_base)
1953 iface->data->iface.vtable_init_base (vtable);
1954 if (iface->data->iface.dflt_init)
1955 iface->data->iface.dflt_init (vtable, (gpointer) iface->data->iface.dflt_data);
1956 G_WRITE_LOCK (&type_rw_lock);
1962 /* This is called to allocate and do the first part of initializing
1963 * the interface vtable; type_iface_vtable_iface_init_Wm() does the remainder.
1965 * A FALSE return indicates that we didn't find an init function for
1966 * this type/iface pair, so the vtable from the parent type should
1967 * be used. Note that the write lock is not modified upon a FALSE
1971 type_iface_vtable_base_init_Wm (TypeNode *iface,
1975 IFaceHolder *iholder;
1976 GTypeInterface *vtable = NULL;
1979 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
1980 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), TRUE);
1982 return FALSE; /* we don't modify write lock upon FALSE */
1984 type_iface_ensure_dflt_vtable_Wm (iface);
1986 entry = type_lookup_iface_entry_L (node, iface);
1988 g_assert (iface->data && entry && entry->vtable == NULL && iholder && iholder->info);
1990 entry->init_state = IFACE_INIT;
1992 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
1993 if (pnode) /* want to copy over parent iface contents */
1995 IFaceEntry *pentry = type_lookup_iface_entry_L (pnode, iface);
1998 vtable = g_memdup (pentry->vtable, iface->data->iface.vtable_size);
2001 vtable = g_memdup (iface->data->iface.dflt_vtable, iface->data->iface.vtable_size);
2002 entry->vtable = vtable;
2003 vtable->g_type = NODE_TYPE (iface);
2004 vtable->g_instance_type = NODE_TYPE (node);
2006 if (iface->data->iface.vtable_init_base)
2008 G_WRITE_UNLOCK (&type_rw_lock);
2009 iface->data->iface.vtable_init_base (vtable);
2010 G_WRITE_LOCK (&type_rw_lock);
2012 return TRUE; /* initialized the vtable */
2015 /* Finishes what type_iface_vtable_base_init_Wm started by
2016 * calling the interface init function.
2017 * this function may only be called for types with their
2018 * own interface holder info, i.e. types for which
2019 * g_type_add_interface*() was called and not children thereof.
2022 type_iface_vtable_iface_init_Wm (TypeNode *iface,
2025 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
2026 IFaceHolder *iholder = type_iface_peek_holder_L (iface, NODE_TYPE (node));
2027 GTypeInterface *vtable = NULL;
2030 /* iholder->info should have been filled in by type_iface_vtable_base_init_Wm() */
2031 g_assert (iface->data && entry && iholder && iholder->info);
2032 g_assert (entry->init_state == IFACE_INIT); /* assert prior base_init() */
2034 entry->init_state = INITIALIZED;
2036 vtable = entry->vtable;
2038 if (iholder->info->interface_init)
2040 G_WRITE_UNLOCK (&type_rw_lock);
2041 if (iholder->info->interface_init)
2042 iholder->info->interface_init (vtable, iholder->info->interface_data);
2043 G_WRITE_LOCK (&type_rw_lock);
2046 for (i = 0; i < static_n_iface_check_funcs; i++)
2048 GTypeInterfaceCheckFunc check_func = static_iface_check_funcs[i].check_func;
2049 gpointer check_data = static_iface_check_funcs[i].check_data;
2051 G_WRITE_UNLOCK (&type_rw_lock);
2052 check_func (check_data, (gpointer)vtable);
2053 G_WRITE_LOCK (&type_rw_lock);
2058 type_iface_vtable_finalize_Wm (TypeNode *iface,
2060 GTypeInterface *vtable)
2062 IFaceEntry *entry = type_lookup_iface_entry_L (node, iface);
2063 IFaceHolder *iholder;
2065 /* type_iface_retrieve_holder_info_Wm() doesn't modify write lock for returning NULL */
2066 iholder = type_iface_retrieve_holder_info_Wm (iface, NODE_TYPE (node), FALSE);
2068 return FALSE; /* we don't modify write lock upon FALSE */
2070 g_assert (entry && entry->vtable == vtable && iholder->info);
2072 entry->vtable = NULL;
2073 entry->init_state = UNINITIALIZED;
2074 if (iholder->info->interface_finalize || iface->data->iface.vtable_finalize_base)
2076 G_WRITE_UNLOCK (&type_rw_lock);
2077 if (iholder->info->interface_finalize)
2078 iholder->info->interface_finalize (vtable, iholder->info->interface_data);
2079 if (iface->data->iface.vtable_finalize_base)
2080 iface->data->iface.vtable_finalize_base (vtable);
2081 G_WRITE_LOCK (&type_rw_lock);
2084 vtable->g_instance_type = 0;
2087 type_iface_blow_holder_info_Wm (iface, NODE_TYPE (node));
2089 return TRUE; /* write lock modified */
2093 type_class_init_Wm (TypeNode *node,
2096 GSList *slist, *init_slist = NULL;
2098 IFaceEntries *entries;
2100 TypeNode *bnode, *pnode;
2103 /* Accessing data->class will work for instantiable types
2104 * too because ClassData is a subset of InstanceData
2106 g_assert (node->is_classed && node->data &&
2107 node->data->class.class_size &&
2108 !node->data->class.class &&
2109 node->data->class.init_state == UNINITIALIZED);
2110 if (node->data->class.class_private_size)
2111 class = g_malloc0 (ALIGN_STRUCT (node->data->class.class_size) + node->data->class.class_private_size);
2113 class = g_malloc0 (node->data->class.class_size);
2114 node->data->class.class = class;
2115 g_atomic_int_set (&node->data->class.init_state, BASE_CLASS_INIT);
2119 TypeNode *pnode = lookup_type_node_I (pclass->g_type);
2121 memcpy (class, pclass, pnode->data->class.class_size);
2122 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);
2124 if (node->is_instantiatable)
2126 /* We need to initialize the private_size here rather than in
2127 * type_data_make_W() since the class init for the parent
2128 * class may have changed pnode->data->instance.private_size.
2130 node->data->instance.private_size = pnode->data->instance.private_size;
2133 class->g_type = NODE_TYPE (node);
2135 G_WRITE_UNLOCK (&type_rw_lock);
2137 /* stack all base class initialization functions, so we
2138 * call them in ascending order.
2140 for (bnode = node; bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
2141 if (bnode->data->class.class_init_base)
2142 init_slist = g_slist_prepend (init_slist, (gpointer) bnode->data->class.class_init_base);
2143 for (slist = init_slist; slist; slist = slist->next)
2145 GBaseInitFunc class_init_base = (GBaseInitFunc) slist->data;
2147 class_init_base (class);
2149 g_slist_free (init_slist);
2151 G_WRITE_LOCK (&type_rw_lock);
2153 g_atomic_int_set (&node->data->class.init_state, BASE_IFACE_INIT);
2155 /* Before we initialize the class, base initialize all interfaces, either
2156 * from parent, or through our holder info
2158 pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
2161 while ((entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node)) != NULL &&
2162 i < IFACE_ENTRIES_N_ENTRIES (entries))
2164 entry = &entries->entry[i];
2165 while (i < IFACE_ENTRIES_N_ENTRIES (entries) &&
2166 entry->init_state == IFACE_INIT)
2172 if (i == IFACE_ENTRIES_N_ENTRIES (entries))
2175 if (!type_iface_vtable_base_init_Wm (lookup_type_node_I (entry->iface_type), node))
2178 IFaceEntries *pentries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (pnode);
2180 /* need to get this interface from parent, type_iface_vtable_base_init_Wm()
2181 * doesn't modify write lock upon FALSE, so entry is still valid;
2183 g_assert (pnode != NULL);
2186 for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (pentries); j++)
2188 IFaceEntry *pentry = &pentries->entry[j];
2190 if (pentry->iface_type == entry->iface_type)
2192 entry->vtable = pentry->vtable;
2193 entry->init_state = INITIALIZED;
2197 g_assert (entry->vtable != NULL);
2200 /* If the write lock was released, additional interface entries might
2201 * have been inserted into CLASSED_NODE_IFACES_ENTRIES (node); they'll
2202 * be base-initialized when inserted, so we don't have to worry that
2203 * we might miss them. Uninitialized entries can only be moved higher
2204 * when new ones are inserted.
2209 g_atomic_int_set (&node->data->class.init_state, CLASS_INIT);
2211 G_WRITE_UNLOCK (&type_rw_lock);
2213 if (node->data->class.class_init)
2214 node->data->class.class_init (class, (gpointer) node->data->class.class_data);
2216 G_WRITE_LOCK (&type_rw_lock);
2218 g_atomic_int_set (&node->data->class.init_state, IFACE_INIT);
2220 /* finish initializing the interfaces through our holder info.
2221 * inherited interfaces are already init_state == INITIALIZED, because
2222 * they either got setup in the above base_init loop, or during
2223 * class_init from within type_add_interface_Wm() for this or
2224 * an anchestor type.
2227 while ((entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node)) != NULL)
2229 entry = &entries->entry[i];
2230 while (i < IFACE_ENTRIES_N_ENTRIES (entries) &&
2231 entry->init_state == INITIALIZED)
2237 if (i == IFACE_ENTRIES_N_ENTRIES (entries))
2240 type_iface_vtable_iface_init_Wm (lookup_type_node_I (entry->iface_type), node);
2242 /* As in the loop above, additional initialized entries might be inserted
2243 * if the write lock is released, but that's harmless because the entries
2244 * we need to initialize only move higher in the list.
2249 g_atomic_int_set (&node->data->class.init_state, INITIALIZED);
2253 type_data_finalize_class_ifaces_Wm (TypeNode *node)
2256 IFaceEntries *entries;
2258 g_assert (node->is_instantiatable && node->data && node->data->class.class && NODE_REFCOUNT (node) == 0);
2261 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
2262 for (i = 0; entries != NULL && i < IFACE_ENTRIES_N_ENTRIES (entries); i++)
2264 IFaceEntry *entry = &entries->entry[i];
2267 if (type_iface_vtable_finalize_Wm (lookup_type_node_I (entry->iface_type), node, entry->vtable))
2269 /* refetch entries, IFACES_ENTRIES might be modified */
2274 /* type_iface_vtable_finalize_Wm() doesn't modify write lock upon FALSE,
2275 * iface vtable came from parent
2277 entry->vtable = NULL;
2278 entry->init_state = UNINITIALIZED;
2285 type_data_finalize_class_U (TypeNode *node,
2288 GTypeClass *class = cdata->class;
2291 g_assert (cdata->class && NODE_REFCOUNT (node) == 0);
2293 if (cdata->class_finalize)
2294 cdata->class_finalize (class, (gpointer) cdata->class_data);
2296 /* call all base class destruction functions in descending order
2298 if (cdata->class_finalize_base)
2299 cdata->class_finalize_base (class);
2300 for (bnode = lookup_type_node_I (NODE_PARENT_TYPE (node)); bnode; bnode = lookup_type_node_I (NODE_PARENT_TYPE (bnode)))
2301 if (bnode->data->class.class_finalize_base)
2302 bnode->data->class.class_finalize_base (class);
2304 g_free (cdata->class);
2308 type_data_last_unref_Wm (TypeNode *node,
2311 g_return_if_fail (node != NULL && node->plugin != NULL);
2313 if (!node->data || NODE_REFCOUNT (node) == 0)
2315 g_warning ("cannot drop last reference to unreferenced type `%s'",
2320 /* call class cache hooks */
2321 if (node->is_classed && node->data && node->data->class.class && static_n_class_cache_funcs && !uncached)
2325 G_WRITE_UNLOCK (&type_rw_lock);
2326 G_READ_LOCK (&type_rw_lock);
2327 for (i = 0; i < static_n_class_cache_funcs; i++)
2329 GTypeClassCacheFunc cache_func = static_class_cache_funcs[i].cache_func;
2330 gpointer cache_data = static_class_cache_funcs[i].cache_data;
2331 gboolean need_break;
2333 G_READ_UNLOCK (&type_rw_lock);
2334 need_break = cache_func (cache_data, node->data->class.class);
2335 G_READ_LOCK (&type_rw_lock);
2336 if (!node->data || NODE_REFCOUNT (node) == 0)
2337 INVALID_RECURSION ("GType class cache function ", cache_func, NODE_NAME (node));
2341 G_READ_UNLOCK (&type_rw_lock);
2342 G_WRITE_LOCK (&type_rw_lock);
2345 /* may have been re-referenced meanwhile */
2346 if (g_atomic_int_dec_and_test ((int *) &node->ref_count))
2348 GType ptype = NODE_PARENT_TYPE (node);
2351 if (node->is_instantiatable)
2353 /* destroy node->data->instance.mem_chunk */
2357 if (node->is_classed && tdata->class.class)
2359 if (CLASSED_NODE_IFACES_ENTRIES_LOCKED (node) != NULL)
2360 type_data_finalize_class_ifaces_Wm (node);
2361 node->mutatable_check_cache = FALSE;
2363 G_WRITE_UNLOCK (&type_rw_lock);
2364 type_data_finalize_class_U (node, &tdata->class);
2365 G_WRITE_LOCK (&type_rw_lock);
2367 else if (NODE_IS_IFACE (node) && tdata->iface.dflt_vtable)
2369 node->mutatable_check_cache = FALSE;
2371 if (tdata->iface.dflt_finalize || tdata->iface.vtable_finalize_base)
2373 G_WRITE_UNLOCK (&type_rw_lock);
2374 if (tdata->iface.dflt_finalize)
2375 tdata->iface.dflt_finalize (tdata->iface.dflt_vtable, (gpointer) tdata->iface.dflt_data);
2376 if (tdata->iface.vtable_finalize_base)
2377 tdata->iface.vtable_finalize_base (tdata->iface.dflt_vtable);
2378 G_WRITE_LOCK (&type_rw_lock);
2380 g_free (tdata->iface.dflt_vtable);
2384 node->mutatable_check_cache = FALSE;
2388 /* freeing tdata->common.value_table and its contents is taken care of
2389 * by allocating it in one chunk with tdata
2393 G_WRITE_UNLOCK (&type_rw_lock);
2394 g_type_plugin_unuse (node->plugin);
2396 type_data_unref_U (lookup_type_node_I (ptype), FALSE);
2397 G_WRITE_LOCK (&type_rw_lock);
2402 type_data_unref_U (TypeNode *node,
2408 current = NODE_REFCOUNT (node);
2414 g_warning ("static type `%s' unreferenced too often",
2419 g_assert (current > 0);
2421 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2422 G_WRITE_LOCK (&type_rw_lock);
2423 type_data_last_unref_Wm (node, uncached);
2424 G_WRITE_UNLOCK (&type_rw_lock);
2425 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2428 } while (!g_atomic_int_compare_and_exchange ((int *) &node->ref_count, current, current - 1));
2432 * g_type_add_class_cache_func:
2433 * @cache_data: data to be passed to @cache_func
2434 * @cache_func: a #GTypeClassCacheFunc
2436 * Adds a #GTypeClassCacheFunc to be called before the reference count of a
2437 * class goes from one to zero. This can be used to prevent premature class
2438 * destruction. All installed #GTypeClassCacheFunc functions will be chained
2439 * until one of them returns %TRUE. The functions have to check the class id
2440 * passed in to figure whether they actually want to cache the class of this
2441 * type, since all classes are routed through the same #GTypeClassCacheFunc
2445 g_type_add_class_cache_func (gpointer cache_data,
2446 GTypeClassCacheFunc cache_func)
2450 g_return_if_fail (cache_func != NULL);
2452 G_WRITE_LOCK (&type_rw_lock);
2453 i = static_n_class_cache_funcs++;
2454 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
2455 static_class_cache_funcs[i].cache_data = cache_data;
2456 static_class_cache_funcs[i].cache_func = cache_func;
2457 G_WRITE_UNLOCK (&type_rw_lock);
2461 * g_type_remove_class_cache_func:
2462 * @cache_data: data that was given when adding @cache_func
2463 * @cache_func: a #GTypeClassCacheFunc
2465 * Removes a previously installed #GTypeClassCacheFunc. The cache
2466 * maintained by @cache_func has to be empty when calling
2467 * g_type_remove_class_cache_func() to avoid leaks.
2470 g_type_remove_class_cache_func (gpointer cache_data,
2471 GTypeClassCacheFunc cache_func)
2473 gboolean found_it = FALSE;
2476 g_return_if_fail (cache_func != NULL);
2478 G_WRITE_LOCK (&type_rw_lock);
2479 for (i = 0; i < static_n_class_cache_funcs; i++)
2480 if (static_class_cache_funcs[i].cache_data == cache_data &&
2481 static_class_cache_funcs[i].cache_func == cache_func)
2483 static_n_class_cache_funcs--;
2484 g_memmove (static_class_cache_funcs + i,
2485 static_class_cache_funcs + i + 1,
2486 sizeof (static_class_cache_funcs[0]) * (static_n_class_cache_funcs - i));
2487 static_class_cache_funcs = g_renew (ClassCacheFunc, static_class_cache_funcs, static_n_class_cache_funcs);
2491 G_WRITE_UNLOCK (&type_rw_lock);
2494 g_warning (G_STRLOC ": cannot remove unregistered class cache func %p with data %p",
2495 cache_func, cache_data);
2500 * g_type_add_interface_check:
2501 * @check_data: data to pass to @check_func
2502 * @check_func: function to be called after each interface
2505 * Adds a function to be called after an interface vtable is
2506 * initialized for any class (i.e. after the @interface_init member of
2507 * #GInterfaceInfo has been called).
2509 * This function is useful when you want to check an invariant that
2510 * depends on the interfaces of a class. For instance, the
2511 * implementation of #GObject uses this facility to check that an
2512 * object implements all of the properties that are defined on its
2518 g_type_add_interface_check (gpointer check_data,
2519 GTypeInterfaceCheckFunc check_func)
2523 g_return_if_fail (check_func != NULL);
2525 G_WRITE_LOCK (&type_rw_lock);
2526 i = static_n_iface_check_funcs++;
2527 static_iface_check_funcs = g_renew (IFaceCheckFunc, static_iface_check_funcs, static_n_iface_check_funcs);
2528 static_iface_check_funcs[i].check_data = check_data;
2529 static_iface_check_funcs[i].check_func = check_func;
2530 G_WRITE_UNLOCK (&type_rw_lock);
2534 * g_type_remove_interface_check:
2535 * @check_data: callback data passed to g_type_add_interface_check()
2536 * @check_func: callback function passed to g_type_add_interface_check()
2538 * Removes an interface check function added with
2539 * g_type_add_interface_check().
2544 g_type_remove_interface_check (gpointer check_data,
2545 GTypeInterfaceCheckFunc check_func)
2547 gboolean found_it = FALSE;
2550 g_return_if_fail (check_func != NULL);
2552 G_WRITE_LOCK (&type_rw_lock);
2553 for (i = 0; i < static_n_iface_check_funcs; i++)
2554 if (static_iface_check_funcs[i].check_data == check_data &&
2555 static_iface_check_funcs[i].check_func == check_func)
2557 static_n_iface_check_funcs--;
2558 g_memmove (static_iface_check_funcs + i,
2559 static_iface_check_funcs + i + 1,
2560 sizeof (static_iface_check_funcs[0]) * (static_n_iface_check_funcs - i));
2561 static_iface_check_funcs = g_renew (IFaceCheckFunc, static_iface_check_funcs, static_n_iface_check_funcs);
2565 G_WRITE_UNLOCK (&type_rw_lock);
2568 g_warning (G_STRLOC ": cannot remove unregistered class check func %p with data %p",
2569 check_func, check_data);
2572 /* --- type registration --- */
2574 * g_type_register_fundamental:
2575 * @type_id: A predefined type identifier.
2576 * @type_name: 0-terminated string used as the name of the new type.
2577 * @info: The #GTypeInfo structure for this type.
2578 * @finfo: The #GTypeFundamentalInfo structure for this type.
2579 * @flags: Bitwise combination of #GTypeFlags values.
2581 * Registers @type_id as the predefined identifier and @type_name as the
2582 * name of a fundamental type. The type system uses the information
2583 * contained in the #GTypeInfo structure pointed to by @info and the
2584 * #GTypeFundamentalInfo structure pointed to by @finfo to manage the
2585 * type and its instances. The value of @flags determines additional
2586 * characteristics of the fundamental type.
2588 * Returns: The predefined type identifier.
2591 g_type_register_fundamental (GType type_id,
2592 const gchar *type_name,
2593 const GTypeInfo *info,
2594 const GTypeFundamentalInfo *finfo,
2599 g_return_val_if_type_system_uninitialized (0);
2600 g_return_val_if_fail (type_id > 0, 0);
2601 g_return_val_if_fail (type_name != NULL, 0);
2602 g_return_val_if_fail (info != NULL, 0);
2603 g_return_val_if_fail (finfo != NULL, 0);
2605 if (!check_type_name_I (type_name))
2607 if ((type_id & TYPE_ID_MASK) ||
2608 type_id > G_TYPE_FUNDAMENTAL_MAX)
2610 g_warning ("attempt to register fundamental type `%s' with invalid type id (%" G_GSIZE_FORMAT ")",
2615 if ((finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
2616 !(finfo->type_flags & G_TYPE_FLAG_CLASSED))
2618 g_warning ("cannot register instantiatable fundamental type `%s' as non-classed",
2622 if (lookup_type_node_I (type_id))
2624 g_warning ("cannot register existing fundamental type `%s' (as `%s')",
2625 type_descriptive_name_I (type_id),
2630 G_WRITE_LOCK (&type_rw_lock);
2631 node = type_node_fundamental_new_W (type_id, type_name, finfo->type_flags);
2632 type_add_flags_W (node, flags);
2634 if (check_type_info_I (NULL, NODE_FUNDAMENTAL_TYPE (node), type_name, info))
2635 type_data_make_W (node, info,
2636 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
2637 G_WRITE_UNLOCK (&type_rw_lock);
2639 return NODE_TYPE (node);
2643 * g_type_register_static_simple:
2644 * @parent_type: Type from which this type will be derived.
2645 * @type_name: 0-terminated string used as the name of the new type.
2646 * @class_size: Size of the class structure (see #GTypeInfo)
2647 * @class_init: Location of the class initialization function (see #GTypeInfo)
2648 * @instance_size: Size of the instance structure (see #GTypeInfo)
2649 * @instance_init: Location of the instance initialization function (see #GTypeInfo)
2650 * @flags: Bitwise combination of #GTypeFlags values.
2652 * Registers @type_name as the name of a new static type derived from
2653 * @parent_type. The value of @flags determines the nature (e.g.
2654 * abstract or not) of the type. It works by filling a #GTypeInfo
2655 * struct and calling g_type_register_static().
2659 * Returns: The new type identifier.
2662 g_type_register_static_simple (GType parent_type,
2663 const gchar *type_name,
2665 GClassInitFunc class_init,
2666 guint instance_size,
2667 GInstanceInitFunc instance_init,
2672 info.class_size = class_size;
2673 info.base_init = NULL;
2674 info.base_finalize = NULL;
2675 info.class_init = class_init;
2676 info.class_finalize = NULL;
2677 info.class_data = NULL;
2678 info.instance_size = instance_size;
2679 info.n_preallocs = 0;
2680 info.instance_init = instance_init;
2681 info.value_table = NULL;
2683 return g_type_register_static (parent_type, type_name, &info, flags);
2687 * g_type_register_static:
2688 * @parent_type: Type from which this type will be derived.
2689 * @type_name: 0-terminated string used as the name of the new type.
2690 * @info: The #GTypeInfo structure for this type.
2691 * @flags: Bitwise combination of #GTypeFlags values.
2693 * Registers @type_name as the name of a new static type derived from
2694 * @parent_type. The type system uses the information contained in the
2695 * #GTypeInfo structure pointed to by @info to manage the type and its
2696 * instances (if not abstract). The value of @flags determines the nature
2697 * (e.g. abstract or not) of the type.
2699 * Returns: The new type identifier.
2702 g_type_register_static (GType parent_type,
2703 const gchar *type_name,
2704 const GTypeInfo *info,
2707 TypeNode *pnode, *node;
2710 g_return_val_if_type_system_uninitialized (0);
2711 g_return_val_if_fail (parent_type > 0, 0);
2712 g_return_val_if_fail (type_name != NULL, 0);
2713 g_return_val_if_fail (info != NULL, 0);
2715 if (!check_type_name_I (type_name) ||
2716 !check_derivation_I (parent_type, type_name))
2718 if (info->class_finalize)
2720 g_warning ("class finalizer specified for static type `%s'",
2725 pnode = lookup_type_node_I (parent_type);
2726 G_WRITE_LOCK (&type_rw_lock);
2727 type_data_ref_Wm (pnode);
2728 if (check_type_info_I (pnode, NODE_FUNDAMENTAL_TYPE (pnode), type_name, info))
2730 node = type_node_new_W (pnode, type_name, NULL);
2731 type_add_flags_W (node, flags);
2732 type = NODE_TYPE (node);
2733 type_data_make_W (node, info,
2734 check_value_table_I (type_name, info->value_table) ? info->value_table : NULL);
2736 G_WRITE_UNLOCK (&type_rw_lock);
2742 * g_type_register_dynamic:
2743 * @parent_type: Type from which this type will be derived.
2744 * @type_name: 0-terminated string used as the name of the new type.
2745 * @plugin: The #GTypePlugin structure to retrieve the #GTypeInfo from.
2746 * @flags: Bitwise combination of #GTypeFlags values.
2748 * Registers @type_name as the name of a new dynamic type derived from
2749 * @parent_type. The type system uses the information contained in the
2750 * #GTypePlugin structure pointed to by @plugin to manage the type and its
2751 * instances (if not abstract). The value of @flags determines the nature
2752 * (e.g. abstract or not) of the type.
2754 * Returns: The new type identifier or #G_TYPE_INVALID if registration failed.
2757 g_type_register_dynamic (GType parent_type,
2758 const gchar *type_name,
2759 GTypePlugin *plugin,
2762 TypeNode *pnode, *node;
2765 g_return_val_if_type_system_uninitialized (0);
2766 g_return_val_if_fail (parent_type > 0, 0);
2767 g_return_val_if_fail (type_name != NULL, 0);
2768 g_return_val_if_fail (plugin != NULL, 0);
2770 if (!check_type_name_I (type_name) ||
2771 !check_derivation_I (parent_type, type_name) ||
2772 !check_plugin_U (plugin, TRUE, FALSE, type_name))
2775 G_WRITE_LOCK (&type_rw_lock);
2776 pnode = lookup_type_node_I (parent_type);
2777 node = type_node_new_W (pnode, type_name, plugin);
2778 type_add_flags_W (node, flags);
2779 type = NODE_TYPE (node);
2780 G_WRITE_UNLOCK (&type_rw_lock);
2786 * g_type_add_interface_static:
2787 * @instance_type: #GType value of an instantiable type.
2788 * @interface_type: #GType value of an interface type.
2789 * @info: The #GInterfaceInfo structure for this
2790 * (@instance_type, @interface_type) combination.
2792 * Adds the static @interface_type to @instantiable_type. The information
2793 * contained in the #GTypeInterfaceInfo structure pointed to by @info
2794 * is used to manage the relationship.
2797 g_type_add_interface_static (GType instance_type,
2798 GType interface_type,
2799 const GInterfaceInfo *info)
2801 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
2802 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
2803 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
2805 /* we only need to lock class_init_rec_mutex if instance_type already has its
2806 * class initialized, however this function is rarely enough called to take
2807 * the simple route and always acquire class_init_rec_mutex.
2809 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2810 G_WRITE_LOCK (&type_rw_lock);
2811 if (check_add_interface_L (instance_type, interface_type))
2813 TypeNode *node = lookup_type_node_I (instance_type);
2814 TypeNode *iface = lookup_type_node_I (interface_type);
2815 if (check_interface_info_I (iface, NODE_TYPE (node), info))
2816 type_add_interface_Wm (node, iface, info, NULL);
2818 G_WRITE_UNLOCK (&type_rw_lock);
2819 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2823 * g_type_add_interface_dynamic:
2824 * @instance_type: the #GType value of an instantiable type.
2825 * @interface_type: the #GType value of an interface type.
2826 * @plugin: the #GTypePlugin structure to retrieve the #GInterfaceInfo from.
2828 * Adds the dynamic @interface_type to @instantiable_type. The information
2829 * contained in the #GTypePlugin structure pointed to by @plugin
2830 * is used to manage the relationship.
2833 g_type_add_interface_dynamic (GType instance_type,
2834 GType interface_type,
2835 GTypePlugin *plugin)
2838 /* G_TYPE_IS_INSTANTIATABLE() is an external call: _U */
2839 g_return_if_fail (G_TYPE_IS_INSTANTIATABLE (instance_type));
2840 g_return_if_fail (g_type_parent (interface_type) == G_TYPE_INTERFACE);
2842 node = lookup_type_node_I (instance_type);
2843 if (!check_plugin_U (plugin, FALSE, TRUE, NODE_NAME (node)))
2846 /* see comment in g_type_add_interface_static() about class_init_rec_mutex */
2847 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2848 G_WRITE_LOCK (&type_rw_lock);
2849 if (check_add_interface_L (instance_type, interface_type))
2851 TypeNode *iface = lookup_type_node_I (interface_type);
2852 type_add_interface_Wm (node, iface, NULL, plugin);
2854 G_WRITE_UNLOCK (&type_rw_lock);
2855 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2859 /* --- public API functions --- */
2862 * @type: Type ID of a classed type.
2864 * Increments the reference count of the class structure belonging to
2865 * @type. This function will demand-create the class if it doesn't
2868 * Returns: The #GTypeClass structure for the given type ID.
2871 g_type_class_ref (GType type)
2878 /* optimize for common code path */
2879 node = lookup_type_node_I (type);
2880 if (!node || !node->is_classed)
2882 g_warning ("cannot retrieve class for invalid (unclassed) type `%s'",
2883 type_descriptive_name_I (type));
2887 if (G_LIKELY (type_data_ref_U (node)))
2889 if (G_LIKELY (g_atomic_int_get (&node->data->class.init_state) == INITIALIZED))
2890 return node->data->class.class;
2896 /* here, we either have node->data->class.class == NULL, or a recursive
2897 * call to g_type_class_ref() with a partly initialized class, or
2898 * node->data->class.init_state == INITIALIZED, because any
2899 * concurrently running initialization was guarded by class_init_rec_mutex.
2901 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
2903 /* we need an initialized parent class for initializing derived classes */
2904 ptype = NODE_PARENT_TYPE (node);
2905 pclass = ptype ? g_type_class_ref (ptype) : NULL;
2907 G_WRITE_LOCK (&type_rw_lock);
2910 type_data_ref_Wm (node);
2912 if (!node->data->class.class) /* class uninitialized */
2913 type_class_init_Wm (node, pclass);
2915 G_WRITE_UNLOCK (&type_rw_lock);
2918 g_type_class_unref (pclass);
2920 g_static_rec_mutex_unlock (&class_init_rec_mutex);
2922 return node->data->class.class;
2926 * g_type_class_unref:
2927 * @g_class: The #GTypeClass structure to unreference.
2929 * Decrements the reference count of the class structure being passed in.
2930 * Once the last reference count of a class has been released, classes
2931 * may be finalized by the type system, so further dereferencing of a
2932 * class pointer after g_type_class_unref() are invalid.
2935 g_type_class_unref (gpointer g_class)
2938 GTypeClass *class = g_class;
2940 g_return_if_fail (g_class != NULL);
2942 node = lookup_type_node_I (class->g_type);
2943 if (node && node->is_classed && NODE_REFCOUNT (node))
2944 type_data_unref_U (node, FALSE);
2946 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2947 type_descriptive_name_I (class->g_type));
2951 * g_type_class_unref_uncached:
2952 * @g_class: The #GTypeClass structure to unreference.
2954 * A variant of g_type_class_unref() for use in #GTypeClassCacheFunc
2955 * implementations. It unreferences a class without consulting the chain
2956 * of #GTypeClassCacheFunc<!-- -->s, avoiding the recursion which would occur
2960 g_type_class_unref_uncached (gpointer g_class)
2963 GTypeClass *class = g_class;
2965 g_return_if_fail (g_class != NULL);
2967 node = lookup_type_node_I (class->g_type);
2968 if (node && node->is_classed && NODE_REFCOUNT (node))
2969 type_data_unref_U (node, TRUE);
2971 g_warning ("cannot unreference class of invalid (unclassed) type `%s'",
2972 type_descriptive_name_I (class->g_type));
2976 * g_type_class_peek:
2977 * @type: Type ID of a classed type.
2979 * This function is essentially the same as g_type_class_ref(), except that
2980 * the classes reference count isn't incremented. As a consequence, this function
2981 * may return %NULL if the class of the type passed in does not currently
2982 * exist (hasn't been referenced before).
2984 * Returns: The #GTypeClass structure for the given type ID or %NULL
2985 * if the class does not currently exist.
2988 g_type_class_peek (GType type)
2993 node = lookup_type_node_I (type);
2994 if (node && node->is_classed && NODE_REFCOUNT (node) &&
2995 g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
2996 /* ref_count _may_ be 0 */
2997 class = node->data->class.class;
3005 * g_type_class_peek_static:
3006 * @type: Type ID of a classed type.
3008 * A more efficient version of g_type_class_peek() which works only for
3012 * Returns: The #GTypeClass structure for the given type ID or %NULL
3013 * if the class does not currently exist or is dynamically loaded.
3016 g_type_class_peek_static (GType type)
3021 node = lookup_type_node_I (type);
3022 if (node && node->is_classed && NODE_REFCOUNT (node) &&
3023 /* peek only static types: */ node->plugin == NULL &&
3024 g_atomic_int_get (&node->data->class.init_state) == INITIALIZED)
3025 /* ref_count _may_ be 0 */
3026 class = node->data->class.class;
3034 * g_type_class_peek_parent:
3035 * @g_class: The #GTypeClass structure to retrieve the parent class for.
3037 * This is a convenience function often needed in class initializers.
3038 * It returns the class structure of the immediate parent type of the
3039 * class passed in. Since derived classes hold a reference count on
3040 * their parent classes as long as they are instantiated, the returned
3041 * class will always exist. This function is essentially equivalent
3045 * g_type_class_peek (g_type_parent (G_TYPE_FROM_CLASS (g_class)));
3048 * Returns: The parent class of @g_class.
3051 g_type_class_peek_parent (gpointer g_class)
3054 gpointer class = NULL;
3056 g_return_val_if_fail (g_class != NULL, NULL);
3058 node = lookup_type_node_I (G_TYPE_FROM_CLASS (g_class));
3059 /* We used to acquire a read lock here. That is not necessary, since
3060 * parent->data->class.class is constant as long as the derived class
3063 if (node && node->is_classed && node->data && NODE_PARENT_TYPE (node))
3065 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
3066 class = node->data->class.class;
3068 else if (NODE_PARENT_TYPE (node))
3069 g_warning (G_STRLOC ": invalid class pointer `%p'", g_class);
3075 * g_type_interface_peek:
3076 * @instance_class: A #GTypeClass structure.
3077 * @iface_type: An interface ID which this class conforms to.
3079 * Returns the #GTypeInterface structure of an interface to which the
3080 * passed in class conforms.
3082 * Returns: The GTypeInterface structure of iface_type if implemented
3083 * by @instance_class, %NULL otherwise
3086 g_type_interface_peek (gpointer instance_class,
3091 gpointer vtable = NULL;
3092 GTypeClass *class = instance_class;
3094 g_return_val_if_fail (instance_class != NULL, NULL);
3096 node = lookup_type_node_I (class->g_type);
3097 iface = lookup_type_node_I (iface_type);
3098 if (node && node->is_instantiatable && iface)
3099 type_lookup_iface_vtable_I (node, iface, &vtable);
3101 g_warning (G_STRLOC ": invalid class pointer `%p'", class);
3107 * g_type_interface_peek_parent:
3108 * @g_iface: A #GTypeInterface structure.
3110 * Returns the corresponding #GTypeInterface structure of the parent type
3111 * of the instance type to which @g_iface belongs. This is useful when
3112 * deriving the implementation of an interface from the parent type and
3113 * then possibly overriding some methods.
3115 * Returns: The corresponding #GTypeInterface structure of the parent
3116 * type of the instance type to which @g_iface belongs, or
3117 * %NULL if the parent type doesn't conform to the interface.
3120 g_type_interface_peek_parent (gpointer g_iface)
3124 gpointer vtable = NULL;
3125 GTypeInterface *iface_class = g_iface;
3127 g_return_val_if_fail (g_iface != NULL, NULL);
3129 iface = lookup_type_node_I (iface_class->g_type);
3130 node = lookup_type_node_I (iface_class->g_instance_type);
3132 node = lookup_type_node_I (NODE_PARENT_TYPE (node));
3133 if (node && node->is_instantiatable && iface)
3134 type_lookup_iface_vtable_I (node, iface, &vtable);
3136 g_warning (G_STRLOC ": invalid interface pointer `%p'", g_iface);
3142 * g_type_default_interface_ref:
3143 * @g_type: an interface type
3145 * Increments the reference count for the interface type @g_type,
3146 * and returns the default interface vtable for the type.
3148 * If the type is not currently in use, then the default vtable
3149 * for the type will be created and initalized by calling
3150 * the base interface init and default vtable init functions for
3151 * the type (the @<structfield>base_init</structfield>
3152 * and <structfield>class_init</structfield> members of #GTypeInfo).
3153 * Calling g_type_default_interface_ref() is useful when you
3154 * want to make sure that signals and properties for an interface
3155 * have been installed.
3159 * Returns: the default vtable for the interface; call
3160 * g_type_default_interface_unref() when you are done using
3164 g_type_default_interface_ref (GType g_type)
3167 gpointer dflt_vtable;
3169 G_WRITE_LOCK (&type_rw_lock);
3171 node = lookup_type_node_I (g_type);
3172 if (!node || !NODE_IS_IFACE (node) ||
3173 (node->data && NODE_REFCOUNT (node) == 0))
3175 G_WRITE_UNLOCK (&type_rw_lock);
3176 g_warning ("cannot retrieve default vtable for invalid or non-interface type '%s'",
3177 type_descriptive_name_I (g_type));
3181 if (!node->data || !node->data->iface.dflt_vtable)
3183 G_WRITE_UNLOCK (&type_rw_lock);
3184 g_static_rec_mutex_lock (&class_init_rec_mutex); /* required locking order: 1) class_init_rec_mutex, 2) type_rw_lock */
3185 G_WRITE_LOCK (&type_rw_lock);
3186 node = lookup_type_node_I (g_type);
3187 type_data_ref_Wm (node);
3188 type_iface_ensure_dflt_vtable_Wm (node);
3189 g_static_rec_mutex_unlock (&class_init_rec_mutex);
3192 type_data_ref_Wm (node); /* ref_count >= 1 already */
3194 dflt_vtable = node->data->iface.dflt_vtable;
3195 G_WRITE_UNLOCK (&type_rw_lock);
3201 * g_type_default_interface_peek:
3202 * @g_type: an interface type
3204 * If the interface type @g_type is currently in use, returns its
3205 * default interface vtable.
3209 * Returns: the default vtable for the interface, or %NULL
3210 * if the type is not currently in use.
3213 g_type_default_interface_peek (GType g_type)
3218 node = lookup_type_node_I (g_type);
3219 if (node && NODE_IS_IFACE (node) && NODE_REFCOUNT (node))
3220 vtable = node->data->iface.dflt_vtable;
3228 * g_type_default_interface_unref:
3229 * @g_iface: the default vtable structure for a interface, as
3230 * returned by g_type_default_interface_ref()
3232 * Decrements the reference count for the type corresponding to the
3233 * interface default vtable @g_iface. If the type is dynamic, then
3234 * when no one is using the interface and all references have
3235 * been released, the finalize function for the interface's default
3236 * vtable (the <structfield>class_finalize</structfield> member of
3237 * #GTypeInfo) will be called.
3242 g_type_default_interface_unref (gpointer g_iface)
3245 GTypeInterface *vtable = g_iface;
3247 g_return_if_fail (g_iface != NULL);
3249 node = lookup_type_node_I (vtable->g_type);
3250 if (node && NODE_IS_IFACE (node))
3251 type_data_unref_U (node, FALSE);
3253 g_warning ("cannot unreference invalid interface default vtable for '%s'",
3254 type_descriptive_name_I (vtable->g_type));
3259 * @type: Type to return name for.
3261 * Get the unique name that is assigned to a type ID. Note that this
3262 * function (like all other GType API) cannot cope with invalid type
3263 * IDs. %G_TYPE_INVALID may be passed to this function, as may be any
3264 * other validly registered type ID, but randomized type IDs should
3265 * not be passed in and will most likely lead to a crash.
3267 * Returns: Static type name or %NULL.
3269 G_CONST_RETURN gchar*
3270 g_type_name (GType type)
3274 g_return_val_if_type_system_uninitialized (NULL);
3276 node = lookup_type_node_I (type);
3278 return node ? NODE_NAME (node) : NULL;
3283 * @type: Type to return quark of type name for.
3285 * Get the corresponding quark of the type IDs name.
3287 * Returns: The type names quark or 0.
3290 g_type_qname (GType type)
3294 node = lookup_type_node_I (type);
3296 return node ? node->qname : 0;
3301 * @name: Type name to lookup.
3303 * Lookup the type ID from a given type name, returning 0 if no type
3304 * has been registered under this name (this is the preferred method
3305 * to find out by name whether a specific type has been registered
3308 * Returns: Corresponding type ID or 0.
3311 g_type_from_name (const gchar *name)
3316 g_return_val_if_fail (name != NULL, 0);
3318 quark = g_quark_try_string (name);
3321 G_READ_LOCK (&type_rw_lock);
3322 type = (GType) g_hash_table_lookup (static_type_nodes_ht, GUINT_TO_POINTER (quark));
3323 G_READ_UNLOCK (&type_rw_lock);
3331 * @type: The derived type.
3333 * Return the direct parent type of the passed in type. If the passed
3334 * in type has no parent, i.e. is a fundamental type, 0 is returned.
3336 * Returns: The parent type.
3339 g_type_parent (GType type)
3343 node = lookup_type_node_I (type);
3345 return node ? NODE_PARENT_TYPE (node) : 0;
3350 * @type: A #GType value.
3352 * Returns the length of the ancestry of the passed in type. This
3353 * includes the type itself, so that e.g. a fundamental type has depth 1.
3355 * Returns: The depth of @type.
3358 g_type_depth (GType type)
3362 node = lookup_type_node_I (type);
3364 return node ? node->n_supers + 1 : 0;
3369 * @leaf_type: Descendant of @root_type and the type to be returned.
3370 * @root_type: Immediate parent of the returned type.
3372 * Given a @leaf_type and a @root_type which is contained in its
3373 * anchestry, return the type that @root_type is the immediate parent
3374 * of. In other words, this function determines the type that is
3375 * derived directly from @root_type which is also a base class of
3376 * @leaf_type. Given a root type and a leaf type, this function can
3377 * be used to determine the types and order in which the leaf type is
3378 * descended from the root type.
3380 * Returns: Immediate child of @root_type and anchestor of @leaf_type.
3383 g_type_next_base (GType type,
3389 node = lookup_type_node_I (type);
3392 TypeNode *base_node = lookup_type_node_I (base_type);
3394 if (base_node && base_node->n_supers < node->n_supers)
3396 guint n = node->n_supers - base_node->n_supers;
3398 if (node->supers[n] == base_type)
3399 atype = node->supers[n - 1];
3406 static inline gboolean
3407 type_node_check_conformities_UorL (TypeNode *node,
3408 TypeNode *iface_node,
3409 /* support_inheritance */
3410 gboolean support_interfaces,
3411 gboolean support_prerequisites,
3416 if (/* support_inheritance && */
3417 NODE_IS_ANCESTOR (iface_node, node))
3420 support_interfaces = support_interfaces && node->is_instantiatable && NODE_IS_IFACE (iface_node);
3421 support_prerequisites = support_prerequisites && NODE_IS_IFACE (node);
3423 if (support_interfaces)
3427 if (type_lookup_iface_entry_L (node, iface_node))
3432 if (type_lookup_iface_vtable_I (node, iface_node, NULL))
3437 support_prerequisites)
3440 G_READ_LOCK (&type_rw_lock);
3441 if (support_prerequisites && type_lookup_prerequisite_L (node, NODE_TYPE (iface_node)))
3444 G_READ_UNLOCK (&type_rw_lock);
3450 type_node_is_a_L (TypeNode *node,
3451 TypeNode *iface_node)
3453 return type_node_check_conformities_UorL (node, iface_node, TRUE, TRUE, TRUE);
3456 static inline gboolean
3457 type_node_conforms_to_U (TypeNode *node,
3458 TypeNode *iface_node,
3459 gboolean support_interfaces,
3460 gboolean support_prerequisites)
3462 return type_node_check_conformities_UorL (node, iface_node, support_interfaces, support_prerequisites, FALSE);
3467 * @type: Type to check anchestry for.
3468 * @is_a_type: Possible anchestor of @type or interface @type could conform to.
3470 * If @is_a_type is a derivable type, check whether @type is a
3471 * descendant of @is_a_type. If @is_a_type is an interface, check
3472 * whether @type conforms to it.
3474 * Returns: %TRUE if @type is_a @is_a_type holds true.
3477 g_type_is_a (GType type,
3480 TypeNode *node, *iface_node;
3483 node = lookup_type_node_I (type);
3484 iface_node = lookup_type_node_I (iface_type);
3485 is_a = node && iface_node && type_node_conforms_to_U (node, iface_node, TRUE, TRUE);
3492 * @type: The parent type.
3493 * @n_children: Optional #guint pointer to contain the number of child types.
3495 * Return a newly allocated and 0-terminated array of type IDs, listing the
3496 * child types of @type. The return value has to be g_free()ed after use.
3498 * Returns: Newly allocated and 0-terminated array of child types.
3501 g_type_children (GType type,
3506 node = lookup_type_node_I (type);
3511 G_READ_LOCK (&type_rw_lock); /* ->children is relocatable */
3512 children = g_new (GType, node->n_children + 1);
3513 memcpy (children, node->children, sizeof (GType) * node->n_children);
3514 children[node->n_children] = 0;
3517 *n_children = node->n_children;
3518 G_READ_UNLOCK (&type_rw_lock);
3532 * g_type_interfaces:
3533 * @type: The type to list interface types for.
3534 * @n_interfaces: Optional #guint pointer to contain the number of
3537 * Return a newly allocated and 0-terminated array of type IDs, listing the
3538 * interface types that @type conforms to. The return value has to be
3539 * g_free()ed after use.
3541 * Returns: Newly allocated and 0-terminated array of interface types.
3544 g_type_interfaces (GType type,
3545 guint *n_interfaces)
3549 node = lookup_type_node_I (type);
3550 if (node && node->is_instantiatable)
3552 IFaceEntries *entries;
3556 G_READ_LOCK (&type_rw_lock);
3557 entries = CLASSED_NODE_IFACES_ENTRIES_LOCKED (node);
3560 ifaces = g_new (GType, IFACE_ENTRIES_N_ENTRIES (entries) + 1);
3561 for (i = 0; i < IFACE_ENTRIES_N_ENTRIES (entries); i++)
3562 ifaces[i] = entries->entry[i].iface_type;
3566 ifaces = g_new (GType, 1);
3573 G_READ_UNLOCK (&type_rw_lock);
3586 typedef struct _QData QData;
3598 static inline gpointer
3599 type_get_qdata_L (TypeNode *node,
3602 GData *gdata = node->global_gdata;
3604 if (quark && gdata && gdata->n_qdatas)
3606 QData *qdatas = gdata->qdatas - 1;
3607 guint n_qdatas = gdata->n_qdatas;
3614 i = (n_qdatas + 1) / 2;
3616 if (quark == check->quark)
3618 else if (quark > check->quark)
3623 else /* if (quark < check->quark) */
3634 * @quark: a #GQuark id to identify the data
3636 * Obtains data which has previously been attached to @type
3637 * with g_type_set_qdata().
3639 * Returns: the data, or %NULL if no data was found
3642 g_type_get_qdata (GType type,
3648 node = lookup_type_node_I (type);
3651 G_READ_LOCK (&type_rw_lock);
3652 data = type_get_qdata_L (node, quark);
3653 G_READ_UNLOCK (&type_rw_lock);
3657 g_return_val_if_fail (node != NULL, NULL);
3664 type_set_qdata_W (TypeNode *node,
3672 /* setup qdata list if necessary */
3673 if (!node->global_gdata)
3674 node->global_gdata = g_new0 (GData, 1);
3675 gdata = node->global_gdata;
3677 /* try resetting old data */
3678 qdata = gdata->qdatas;
3679 for (i = 0; i < gdata->n_qdatas; i++)
3680 if (qdata[i].quark == quark)
3682 qdata[i].data = data;
3688 gdata->qdatas = g_renew (QData, gdata->qdatas, gdata->n_qdatas);
3689 qdata = gdata->qdatas;
3690 for (i = 0; i < gdata->n_qdatas - 1; i++)
3691 if (qdata[i].quark > quark)
3693 g_memmove (qdata + i + 1, qdata + i, sizeof (qdata[0]) * (gdata->n_qdatas - i - 1));
3694 qdata[i].quark = quark;
3695 qdata[i].data = data;
3701 * @quark: a #GQuark id to identify the data
3704 * Attaches arbitrary data to a type.
3707 g_type_set_qdata (GType type,
3713 g_return_if_fail (quark != 0);
3715 node = lookup_type_node_I (type);
3718 G_WRITE_LOCK (&type_rw_lock);
3719 type_set_qdata_W (node, quark, data);
3720 G_WRITE_UNLOCK (&type_rw_lock);
3723 g_return_if_fail (node != NULL);
3727 type_add_flags_W (TypeNode *node,
3732 g_return_if_fail ((flags & ~TYPE_FLAG_MASK) == 0);
3733 g_return_if_fail (node != NULL);
3735 if ((flags & TYPE_FLAG_MASK) && node->is_classed && node->data && node->data->class.class)
3736 g_warning ("tagging type `%s' as abstract after class initialization", NODE_NAME (node));
3737 dflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
3739 type_set_qdata_W (node, static_quark_type_flags, GUINT_TO_POINTER (dflags));
3744 * @type: the #GType value of a static, classed type.
3745 * @query: A user provided structure that is filled in with constant values
3748 * Queries the type system for information about a specific type.
3749 * This function will fill in a user-provided structure to hold
3750 * type-specific information. If an invalid #GType is passed in, the
3751 * @type member of the #GTypeQuery is 0. All members filled into the
3752 * #GTypeQuery structure should be considered constant and have to be
3756 g_type_query (GType type,
3761 g_return_if_fail (query != NULL);
3763 /* if node is not static and classed, we won't allow query */
3765 node = lookup_type_node_I (type);
3766 if (node && node->is_classed && !node->plugin)
3768 /* type is classed and probably even instantiatable */
3769 G_READ_LOCK (&type_rw_lock);
3770 if (node->data) /* type is static or referenced */
3772 query->type = NODE_TYPE (node);
3773 query->type_name = NODE_NAME (node);
3774 query->class_size = node->data->class.class_size;
3775 query->instance_size = node->is_instantiatable ? node->data->instance.instance_size : 0;
3777 G_READ_UNLOCK (&type_rw_lock);
3782 /* --- implementation details --- */
3784 g_type_test_flags (GType type,
3788 gboolean result = FALSE;
3790 node = lookup_type_node_I (type);
3793 guint fflags = flags & TYPE_FUNDAMENTAL_FLAG_MASK;
3794 guint tflags = flags & TYPE_FLAG_MASK;
3798 GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (node);
3800 fflags = (finfo->type_flags & fflags) == fflags;
3807 G_READ_LOCK (&type_rw_lock);
3808 tflags = (tflags & GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags))) == tflags;
3809 G_READ_UNLOCK (&type_rw_lock);
3814 result = tflags && fflags;
3821 * g_type_get_plugin:
3822 * @type: The #GType to retrieve the plugin for.
3824 * Returns the #GTypePlugin structure for @type or
3825 * %NULL if @type does not have a #GTypePlugin structure.
3827 * Returns: The corresponding plugin if @type is a dynamic type,
3831 g_type_get_plugin (GType type)
3835 node = lookup_type_node_I (type);
3837 return node ? node->plugin : NULL;
3841 * g_type_interface_get_plugin:
3842 * @instance_type: the #GType value of an instantiatable type.
3843 * @interface_type: the #GType value of an interface type.
3845 * Returns the #GTypePlugin structure for the dynamic interface
3846 * @interface_type which has been added to @instance_type, or %NULL if
3847 * @interface_type has not been added to @instance_type or does not
3848 * have a #GTypePlugin structure. See g_type_add_interface_dynamic().
3850 * Returns: the #GTypePlugin for the dynamic interface @interface_type
3851 * of @instance_type.
3854 g_type_interface_get_plugin (GType instance_type,
3855 GType interface_type)
3860 g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface_type), NULL); /* G_TYPE_IS_INTERFACE() is an external call: _U */
3862 node = lookup_type_node_I (instance_type);
3863 iface = lookup_type_node_I (interface_type);
3866 IFaceHolder *iholder;
3867 GTypePlugin *plugin;
3869 G_READ_LOCK (&type_rw_lock);
3871 iholder = iface_node_get_holders_L (iface);
3872 while (iholder && iholder->instance_type != instance_type)
3873 iholder = iholder->next;
3874 plugin = iholder ? iholder->plugin : NULL;
3876 G_READ_UNLOCK (&type_rw_lock);
3881 g_return_val_if_fail (node == NULL, NULL);
3882 g_return_val_if_fail (iface == NULL, NULL);
3884 g_warning (G_STRLOC ": attempt to look up plugin for invalid instance/interface type pair.");
3890 * g_type_fundamental_next:
3892 * Returns the next free fundamental type id which can be used to
3893 * register a new fundamental type with g_type_register_fundamental().
3894 * The returned type ID represents the highest currently registered
3895 * fundamental type identifier.
3897 * Returns: The nextmost fundamental type ID to be registered,
3898 * or 0 if the type system ran out of fundamental type IDs.
3901 g_type_fundamental_next (void)
3905 G_READ_LOCK (&type_rw_lock);
3906 type = static_fundamental_next;
3907 G_READ_UNLOCK (&type_rw_lock);
3908 type = G_TYPE_MAKE_FUNDAMENTAL (type);
3909 return type <= G_TYPE_FUNDAMENTAL_MAX ? type : 0;
3913 * g_type_fundamental:
3914 * @type_id: valid type ID
3916 * Internal function, used to extract the fundamental type ID portion.
3917 * use G_TYPE_FUNDAMENTAL() instead.
3919 * Returns: fundamental type ID
3922 g_type_fundamental (GType type_id)
3924 TypeNode *node = lookup_type_node_I (type_id);
3926 return node ? NODE_FUNDAMENTAL_TYPE (node) : 0;
3930 g_type_check_instance_is_a (GTypeInstance *type_instance,
3933 TypeNode *node, *iface;
3936 if (!type_instance || !type_instance->g_class)
3939 node = lookup_type_node_I (type_instance->g_class->g_type);
3940 iface = lookup_type_node_I (iface_type);
3941 check = node && node->is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
3947 g_type_check_class_is_a (GTypeClass *type_class,
3950 TypeNode *node, *iface;
3956 node = lookup_type_node_I (type_class->g_type);
3957 iface = lookup_type_node_I (is_a_type);
3958 check = node && node->is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
3964 g_type_check_instance_cast (GTypeInstance *type_instance,
3969 if (type_instance->g_class)
3971 TypeNode *node, *iface;
3972 gboolean is_instantiatable, check;
3974 node = lookup_type_node_I (type_instance->g_class->g_type);
3975 is_instantiatable = node && node->is_instantiatable;
3976 iface = lookup_type_node_I (iface_type);
3977 check = is_instantiatable && iface && type_node_conforms_to_U (node, iface, TRUE, FALSE);
3979 return type_instance;
3981 if (is_instantiatable)
3982 g_warning ("invalid cast from `%s' to `%s'",
3983 type_descriptive_name_I (type_instance->g_class->g_type),
3984 type_descriptive_name_I (iface_type));
3986 g_warning ("invalid uninstantiatable type `%s' in cast to `%s'",
3987 type_descriptive_name_I (type_instance->g_class->g_type),
3988 type_descriptive_name_I (iface_type));
3991 g_warning ("invalid unclassed pointer in cast to `%s'",
3992 type_descriptive_name_I (iface_type));
3995 return type_instance;
3999 g_type_check_class_cast (GTypeClass *type_class,
4004 TypeNode *node, *iface;
4005 gboolean is_classed, check;
4007 node = lookup_type_node_I (type_class->g_type);
4008 is_classed = node && node->is_classed;
4009 iface = lookup_type_node_I (is_a_type);
4010 check = is_classed && iface && type_node_conforms_to_U (node, iface, FALSE, FALSE);
4015 g_warning ("invalid class cast from `%s' to `%s'",
4016 type_descriptive_name_I (type_class->g_type),
4017 type_descriptive_name_I (is_a_type));
4019 g_warning ("invalid unclassed type `%s' in class cast to `%s'",
4020 type_descriptive_name_I (type_class->g_type),
4021 type_descriptive_name_I (is_a_type));
4024 g_warning ("invalid class cast from (NULL) pointer to `%s'",
4025 type_descriptive_name_I (is_a_type));
4030 * g_type_check_instance:
4031 * @instance: A valid #GTypeInstance structure.
4033 * Private helper function to aid implementation of the G_TYPE_CHECK_INSTANCE()
4036 * @Returns: #TRUE if @instance is valid, #FALSE otherwise.
4039 g_type_check_instance (GTypeInstance *type_instance)
4041 /* this function is just here to make the signal system
4042 * conveniently elaborated on instance checks
4046 if (type_instance->g_class)
4048 TypeNode *node = lookup_type_node_I (type_instance->g_class->g_type);
4050 if (node && node->is_instantiatable)
4053 g_warning ("instance of invalid non-instantiatable type `%s'",
4054 type_descriptive_name_I (type_instance->g_class->g_type));
4057 g_warning ("instance with invalid (NULL) class pointer");
4060 g_warning ("invalid (NULL) pointer instance");
4065 static inline gboolean
4066 type_check_is_value_type_U (GType type)
4068 GTypeFlags tflags = G_TYPE_FLAG_VALUE_ABSTRACT;
4071 /* common path speed up */
4072 node = lookup_type_node_I (type);
4073 if (node && node->mutatable_check_cache)
4076 G_READ_LOCK (&type_rw_lock);
4080 if (node->data && NODE_REFCOUNT (node) > 0 &&
4081 node->data->common.value_table->value_init)
4082 tflags = GPOINTER_TO_UINT (type_get_qdata_L (node, static_quark_type_flags));
4083 else if (NODE_IS_IFACE (node))
4087 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
4089 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
4090 TypeNode *prnode = lookup_type_node_I (prtype);
4092 if (prnode->is_instantiatable)
4095 node = lookup_type_node_I (type);
4101 G_READ_UNLOCK (&type_rw_lock);
4103 return !(tflags & G_TYPE_FLAG_VALUE_ABSTRACT);
4107 g_type_check_is_value_type (GType type)
4109 return type_check_is_value_type_U (type);
4113 g_type_check_value (GValue *value)
4115 return value && type_check_is_value_type_U (value->g_type);
4119 g_type_check_value_holds (GValue *value,
4122 return value && type_check_is_value_type_U (value->g_type) && g_type_is_a (value->g_type, type);
4126 * g_type_value_table_peek:
4127 * @type: A #GType value.
4129 * Returns the location of the #GTypeValueTable associated with @type.
4130 * <emphasis>Note that this function should only be used from source code
4131 * that implements or has internal knowledge of the implementation of
4134 * Returns: Location of the #GTypeValueTable associated with @type or
4135 * %NULL if there is no #GTypeValueTable associated with @type.
4138 g_type_value_table_peek (GType type)
4140 GTypeValueTable *vtable = NULL;
4141 TypeNode *node = lookup_type_node_I (type);
4142 gboolean has_refed_data, has_table;
4144 if (node && NODE_REFCOUNT (node) && node->mutatable_check_cache)
4145 return node->data->common.value_table;
4147 G_READ_LOCK (&type_rw_lock);
4150 has_refed_data = node && node->data && NODE_REFCOUNT (node) > 0;
4151 has_table = has_refed_data && node->data->common.value_table->value_init;
4155 vtable = node->data->common.value_table;
4156 else if (NODE_IS_IFACE (node))
4160 for (i = 0; i < IFACE_NODE_N_PREREQUISITES (node); i++)
4162 GType prtype = IFACE_NODE_PREREQUISITES (node)[i];
4163 TypeNode *prnode = lookup_type_node_I (prtype);
4165 if (prnode->is_instantiatable)
4168 node = lookup_type_node_I (type);
4169 goto restart_table_peek;
4175 G_READ_UNLOCK (&type_rw_lock);
4181 g_warning (G_STRLOC ": type id `%" G_GSIZE_FORMAT "' is invalid", type);
4182 if (!has_refed_data)
4183 g_warning ("can't peek value table for type `%s' which is not currently referenced",
4184 type_descriptive_name_I (type));
4189 G_CONST_RETURN gchar*
4190 g_type_name_from_instance (GTypeInstance *instance)
4193 return "<NULL-instance>";
4195 return g_type_name_from_class (instance->g_class);
4198 G_CONST_RETURN gchar*
4199 g_type_name_from_class (GTypeClass *g_class)
4202 return "<NULL-class>";
4204 return g_type_name (g_class->g_type);
4208 /* --- private api for gboxed.c --- */
4210 _g_type_boxed_copy (GType type, gpointer value)
4212 TypeNode *node = lookup_type_node_I (type);
4214 return node->data->boxed.copy_func (value);
4218 _g_type_boxed_free (GType type, gpointer value)
4220 TypeNode *node = lookup_type_node_I (type);
4222 node->data->boxed.free_func (value);
4226 _g_type_boxed_init (GType type,
4227 GBoxedCopyFunc copy_func,
4228 GBoxedFreeFunc free_func)
4230 TypeNode *node = lookup_type_node_I (type);
4232 node->data->boxed.copy_func = copy_func;
4233 node->data->boxed.free_func = free_func;
4236 /* --- initialization --- */
4238 * g_type_init_with_debug_flags:
4239 * @debug_flags: Bitwise combination of #GTypeDebugFlags values for
4240 * debugging purposes.
4242 * Similar to g_type_init(), but additionally sets debug flags.
4245 g_type_init_with_debug_flags (GTypeDebugFlags debug_flags)
4247 G_LOCK_DEFINE_STATIC (type_init_lock);
4248 const gchar *env_string;
4251 volatile GType votype;
4253 #ifdef G_THREADS_ENABLED
4254 if (!g_thread_get_initialized())
4255 g_thread_init (NULL);
4258 G_LOCK (type_init_lock);
4260 G_WRITE_LOCK (&type_rw_lock);
4262 if (static_quark_type_flags)
4264 G_WRITE_UNLOCK (&type_rw_lock);
4265 G_UNLOCK (type_init_lock);
4269 /* setup GObject library wide debugging flags */
4270 _g_type_debug_flags = debug_flags & G_TYPE_DEBUG_MASK;
4271 env_string = g_getenv ("GOBJECT_DEBUG");
4272 if (env_string != NULL)
4274 static GDebugKey debug_keys[] = {
4275 { "objects", G_TYPE_DEBUG_OBJECTS },
4276 { "signals", G_TYPE_DEBUG_SIGNALS },
4279 _g_type_debug_flags |= g_parse_debug_string (env_string,
4281 sizeof (debug_keys) / sizeof (debug_keys[0]));
4286 static_quark_type_flags = g_quark_from_static_string ("-g-type-private--GTypeFlags");
4287 static_quark_iface_holder = g_quark_from_static_string ("-g-type-private--IFaceHolder");
4288 static_quark_dependants_array = g_quark_from_static_string ("-g-type-private--dependants-array");
4290 /* type qname hash table */
4291 static_type_nodes_ht = g_hash_table_new (g_direct_hash, g_direct_equal);
4293 /* invalid type G_TYPE_INVALID (0)
4295 static_fundamental_type_nodes[0] = NULL;
4297 /* void type G_TYPE_NONE
4299 node = type_node_fundamental_new_W (G_TYPE_NONE, g_intern_static_string ("void"), 0);
4300 votype = NODE_TYPE (node);
4301 g_assert (votype == G_TYPE_NONE);
4303 /* interface fundamental type G_TYPE_INTERFACE (!classed)
4305 memset (&info, 0, sizeof (info));
4306 node = type_node_fundamental_new_W (G_TYPE_INTERFACE, g_intern_static_string ("GInterface"), G_TYPE_FLAG_DERIVABLE);
4307 votype = NODE_TYPE (node);
4308 type_data_make_W (node, &info, NULL);
4309 g_assert (votype == G_TYPE_INTERFACE);
4311 G_WRITE_UNLOCK (&type_rw_lock);
4315 /* G_TYPE_TYPE_PLUGIN
4317 votype = g_type_plugin_get_type ();
4319 /* G_TYPE_* value types
4321 g_value_types_init ();
4323 /* G_TYPE_ENUM & G_TYPE_FLAGS
4325 g_enum_types_init ();
4329 g_boxed_type_init ();
4333 g_param_type_init ();
4337 g_object_type_init ();
4339 /* G_TYPE_PARAM_* pspec types
4341 g_param_spec_types_init ();
4343 /* Value Transformations
4345 g_value_transforms_init ();
4351 G_UNLOCK (type_init_lock);
4357 * Prior to any use of the type system, g_type_init() has to be called
4358 * to initialize the type system and assorted other code portions
4359 * (such as the various fundamental type implementations or the signal
4362 * Since version 2.24 this also initializes the thread system
4367 g_type_init_with_debug_flags (0);
4371 * g_type_class_add_private:
4372 * @g_class: class structure for an instantiatable type
4373 * @private_size: size of private structure.
4375 * Registers a private structure for an instantiatable type.
4377 * When an object is allocated, the private structures for
4378 * the type and all of its parent types are allocated
4379 * sequentially in the same memory block as the public
4382 * Note that the accumulated size of the private structures of
4383 * a type and all its parent types cannot excced 64kB.
4385 * This function should be called in the type's class_init() function.
4386 * The private structure can be retrieved using the
4387 * G_TYPE_INSTANCE_GET_PRIVATE() macro.
4389 * The following example shows attaching a private structure
4390 * <structname>MyObjectPrivate</structname> to an object
4391 * <structname>MyObject</structname> defined in the standard GObject
4393 * type's class_init() function.
4396 * typedef struct _MyObject MyObject;
4397 * typedef struct _MyObjectPrivate MyObjectPrivate;
4399 * struct _MyObject {
4402 * MyObjectPrivate *priv;
4405 * struct _MyObjectPrivate {
4410 * my_object_class_init (MyObjectClass *klass)
4412 * g_type_class_add_private (klass, sizeof (MyObjectPrivate));
4416 * my_object_init (MyObject *my_object)
4418 * my_object->priv = G_TYPE_INSTANCE_GET_PRIVATE (my_object,
4424 * my_object_get_some_field (MyObject *my_object)
4426 * MyObjectPrivate *priv = my_object->priv;
4428 * return priv->some_field;
4435 g_type_class_add_private (gpointer g_class,
4438 GType instance_type = ((GTypeClass *)g_class)->g_type;
4439 TypeNode *node = lookup_type_node_I (instance_type);
4442 g_return_if_fail (private_size > 0);
4443 g_return_if_fail (private_size <= 0xffff);
4445 if (!node || !node->is_instantiatable || !node->data || node->data->class.class != g_class)
4447 g_warning ("cannot add private field to invalid (non-instantiatable) type '%s'",
4448 type_descriptive_name_I (instance_type));
4452 if (NODE_PARENT_TYPE (node))
4454 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
4455 if (node->data->instance.private_size != pnode->data->instance.private_size)
4457 g_warning ("g_type_add_private() called multiple times for the same type");
4462 G_WRITE_LOCK (&type_rw_lock);
4464 offset = ALIGN_STRUCT (node->data->instance.private_size);
4466 g_assert (offset + private_size <= 0xffff);
4468 node->data->instance.private_size = offset + private_size;
4470 G_WRITE_UNLOCK (&type_rw_lock);
4474 g_type_instance_get_private (GTypeInstance *instance,
4477 TypeNode *instance_node;
4478 TypeNode *private_node;
4479 TypeNode *parent_node;
4483 g_return_val_if_fail (instance != NULL && instance->g_class != NULL, NULL);
4485 /* while instances are initialized, their class pointers change,
4486 * so figure the instances real class first
4488 class = instance_real_class_get (instance);
4490 class = instance->g_class;
4492 instance_node = lookup_type_node_I (class->g_type);
4493 if (G_UNLIKELY (!instance_node || !instance_node->is_instantiatable))
4495 g_warning ("instance of invalid non-instantiatable type `%s'",
4496 type_descriptive_name_I (instance->g_class->g_type));
4500 private_node = lookup_type_node_I (private_type);
4501 if (G_UNLIKELY (!private_node || !NODE_IS_ANCESTOR (private_node, instance_node)))
4503 g_warning ("attempt to retrieve private data for invalid type '%s'",
4504 type_descriptive_name_I (private_type));
4508 /* Note that we don't need a read lock, since instance existing
4509 * means that the instance class and all parent classes
4510 * exist, so the node->data, node->data->instance.instance_size,
4511 * and node->data->instance.private_size are not going to be changed.
4512 * for any of the relevant types.
4515 offset = ALIGN_STRUCT (instance_node->data->instance.instance_size);
4517 if (NODE_PARENT_TYPE (private_node))
4519 parent_node = lookup_type_node_I (NODE_PARENT_TYPE (private_node));
4520 g_assert (parent_node->data && NODE_REFCOUNT (parent_node) > 0);
4522 if (G_UNLIKELY (private_node->data->instance.private_size == parent_node->data->instance.private_size))
4524 g_warning ("g_type_instance_get_private() requires a prior call to g_type_class_add_private()");
4528 offset += ALIGN_STRUCT (parent_node->data->instance.private_size);
4531 return G_STRUCT_MEMBER_P (instance, offset);
4535 * g_type_add_class_private:
4536 * @class_type: GType of an classed type.
4537 * @private_size: size of private structure.
4539 * Registers a private class structure for a classed type;
4540 * when the class is allocated, the private structures for
4541 * the class and all of its parent types are allocated
4542 * sequentially in the same memory block as the public
4543 * structures. This function should be called in the
4544 * type's get_type() function after the type is registered.
4545 * The private structure can be retrieved using the
4546 * G_TYPE_CLASS_GET_PRIVATE() macro.
4551 g_type_add_class_private (GType class_type,
4554 TypeNode *node = lookup_type_node_I (class_type);
4557 g_return_if_fail (private_size > 0);
4559 if (!node || !node->is_classed || !node->data)
4561 g_warning ("cannot add class private field to invalid type '%s'",
4562 type_descriptive_name_I (class_type));
4566 if (NODE_PARENT_TYPE (node))
4568 TypeNode *pnode = lookup_type_node_I (NODE_PARENT_TYPE (node));
4569 if (node->data->class.class_private_size != pnode->data->class.class_private_size)
4571 g_warning ("g_type_add_class_private() called multiple times for the same type");
4576 G_WRITE_LOCK (&type_rw_lock);
4578 offset = ALIGN_STRUCT (node->data->class.class_private_size);
4579 node->data->class.class_private_size = offset + private_size;
4581 G_WRITE_UNLOCK (&type_rw_lock);
4585 g_type_class_get_private (GTypeClass *klass,
4588 TypeNode *class_node;
4589 TypeNode *private_node;
4590 TypeNode *parent_node;
4593 g_return_val_if_fail (klass != NULL, NULL);
4595 class_node = lookup_type_node_I (klass->g_type);
4596 if (G_UNLIKELY (!class_node || !class_node->is_classed))
4598 g_warning ("class of invalid type `%s'",
4599 type_descriptive_name_I (klass->g_type));
4603 private_node = lookup_type_node_I (private_type);
4604 if (G_UNLIKELY (!private_node || !NODE_IS_ANCESTOR (private_node, class_node)))
4606 g_warning ("attempt to retrieve private data for invalid type '%s'",
4607 type_descriptive_name_I (private_type));
4611 offset = ALIGN_STRUCT (class_node->data->class.class_size);
4613 if (NODE_PARENT_TYPE (private_node))
4615 parent_node = lookup_type_node_I (NODE_PARENT_TYPE (private_node));
4616 g_assert (parent_node->data && NODE_REFCOUNT (parent_node) > 0);
4618 if (G_UNLIKELY (private_node->data->class.class_private_size == parent_node->data->class.class_private_size))
4620 g_warning ("g_type_instance_get_class_private() requires a prior call to g_type_class_add_class_private()");
4624 offset += ALIGN_STRUCT (parent_node->data->class.class_private_size);
4627 return G_STRUCT_MEMBER_P (klass, offset);