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gtype.c
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gtype.c
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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* MT safe
*/
#include "config.h"
#include <string.h>
#include "gtype.h"
#include "gtype-private.h"
#include "gtypeplugin.h"
#include "gvaluecollector.h"
#include "gbsearcharray.h"
#include "gatomicarray.h"
#include "gobject_trace.h"
/**
* SECTION:gtype
* @short_description: The GLib Runtime type identification and
* management system
* @title:Type Information
*
* The GType API is the foundation of the GObject system. It provides the
* facilities for registering and managing all fundamental data types,
* user-defined object and interface types. Before using any GType
* or GObject functions, g_type_init() must be called to initialize the
* type system.
*
* For type creation and registration purposes, all types fall into one of
* two categories: static or dynamic. Static types are never loaded or
* unloaded at run-time as dynamic types may be. Static types are created
* with g_type_register_static() that gets type specific information passed
* in via a #GTypeInfo structure.
* Dynamic types are created with g_type_register_dynamic() which takes a
* #GTypePlugin structure instead. The remaining type information (the
* #GTypeInfo structure) is retrieved during runtime through #GTypePlugin
* and the g_type_plugin_*() API.
* These registration functions are usually called only once from a
* function whose only purpose is to return the type identifier for a
* specific class. Once the type (or class or interface) is registered,
* it may be instantiated, inherited, or implemented depending on exactly
* what sort of type it is.
* There is also a third registration function for registering fundamental
* types called g_type_register_fundamental() which requires both a #GTypeInfo
* structure and a #GTypeFundamentalInfo structure but it is seldom used
* since most fundamental types are predefined rather than user-defined.
*
* Type instance and class structs are limited to a total of 64 KiB,
* including all parent types. Similarly, type instances' private data
* (as created by g_type_class_add_private()) are limited to a total of
* 64 KiB. If a type instance needs a large static buffer, allocate it
* separately (typically by using #GArray or #GPtrArray) and put a pointer
* to the buffer in the structure.
*
* A final word about type names.
* Such an identifier needs to be at least three characters long. There is no
* upper length limit. The first character needs to be a letter (a-z or A-Z)
* or an underscore '_'. Subsequent characters can be letters, numbers or
* any of '-_+'.
*/
/* NOTE: some functions (some internal variants and exported ones)
* invalidate data portions of the TypeNodes. if external functions/callbacks
* are called, pointers to memory maintained by TypeNodes have to be looked up
* again. this affects most of the struct TypeNode fields, e.g. ->children or
* CLASSED_NODE_IFACES_ENTRIES() respectively IFACE_NODE_PREREQUISITES() (but
* not ->supers[]), as all those memory portions can get realloc()ed during
* callback invocation.
*
* LOCKING:
* lock handling issues when calling static functions are indicated by
* uppercase letter postfixes, all static functions have to have
* one of the below postfixes:
* - _I: [Indifferent about locking]
* function doesn't care about locks at all
* - _U: [Unlocked invocation]
* no read or write lock has to be held across function invocation
* (locks may be acquired and released during invocation though)
* - _L: [Locked invocation]
* a write lock or more than 0 read locks have to be held across
* function invocation
* - _W: [Write-locked invocation]
* a write lock has to be held across function invocation
* - _Wm: [Write-locked invocation, mutatable]
* like _W, but the write lock might be released and reacquired
* during invocation, watch your pointers
* - _WmREC: [Write-locked invocation, mutatable, recursive]
* like _Wm, but also acquires recursive mutex class_init_rec_mutex
*/
#ifdef LOCK_DEBUG
#define G_READ_LOCK(rw_lock) do { g_printerr (G_STRLOC ": readL++\n"); g_rw_lock_reader_lock (rw_lock); } while (0)
#define G_READ_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": readL--\n"); g_rw_lock_reader_unlock (rw_lock); } while (0)
#define G_WRITE_LOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL++\n"); g_rw_lock_writer_lock (rw_lock); } while (0)
#define G_WRITE_UNLOCK(rw_lock) do { g_printerr (G_STRLOC ": writeL--\n"); g_rw_lock_writer_unlock (rw_lock); } while (0)
#else
#define G_READ_LOCK(rw_lock) g_rw_lock_reader_lock (rw_lock)
#define G_READ_UNLOCK(rw_lock) g_rw_lock_reader_unlock (rw_lock)
#define G_WRITE_LOCK(rw_lock) g_rw_lock_writer_lock (rw_lock)
#define G_WRITE_UNLOCK(rw_lock) g_rw_lock_writer_unlock (rw_lock)
#endif
#define INVALID_RECURSION(func, arg, type_name) G_STMT_START{ \
static const gchar _action[] = " invalidly modified type "; \
gpointer _arg = (gpointer) (arg); const gchar *_tname = (type_name), *_fname = (func); \
if (_arg) \
g_error ("%s(%p)%s`%s'", _fname, _arg, _action, _tname); \
else \
g_error ("%s()%s`%s'", _fname, _action, _tname); \
}G_STMT_END
#define g_return_val_if_type_system_uninitialized(return_value) G_STMT_START{ \
if (G_UNLIKELY (!static_quark_type_flags)) \
{ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
"%s: You forgot to call g_type_init()", \
G_STRLOC); \
return (return_value); \
} \
}G_STMT_END
#ifdef G_ENABLE_DEBUG
#define DEBUG_CODE(debug_type, code_block) G_STMT_START { \
if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) \
{ code_block; } \
} G_STMT_END
#else /* !G_ENABLE_DEBUG */
#define DEBUG_CODE(debug_type, code_block) /* code_block */
#endif /* G_ENABLE_DEBUG */
#define TYPE_FUNDAMENTAL_FLAG_MASK (G_TYPE_FLAG_CLASSED | \
G_TYPE_FLAG_INSTANTIATABLE | \
G_TYPE_FLAG_DERIVABLE | \
G_TYPE_FLAG_DEEP_DERIVABLE)
#define TYPE_FLAG_MASK (G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT)
#define SIZEOF_FUNDAMENTAL_INFO ((gssize) MAX (MAX (sizeof (GTypeFundamentalInfo), \
sizeof (gpointer)), \
sizeof (glong)))
/* The 2*sizeof(size_t) alignment here is borrowed from
* GNU libc, so it should be good most everywhere.
* It is more conservative than is needed on some 64-bit
* platforms, but ia64 does require a 16-byte alignment.
* The SIMD extensions for x86 and ppc32 would want a
* larger alignment than this, but we don't need to
* do better than malloc.
*/
#define STRUCT_ALIGNMENT (2 * sizeof (gsize))
#define ALIGN_STRUCT(offset) \
((offset + (STRUCT_ALIGNMENT - 1)) & -STRUCT_ALIGNMENT)
/* --- typedefs --- */
typedef struct _TypeNode TypeNode;
typedef struct _CommonData CommonData;
typedef struct _BoxedData BoxedData;
typedef struct _IFaceData IFaceData;
typedef struct _ClassData ClassData;
typedef struct _InstanceData InstanceData;
typedef union _TypeData TypeData;
typedef struct _IFaceEntries IFaceEntries;
typedef struct _IFaceEntry IFaceEntry;
typedef struct _IFaceHolder IFaceHolder;
/* --- prototypes --- */
static inline GTypeFundamentalInfo* type_node_fundamental_info_I (TypeNode *node);
static void type_add_flags_W (TypeNode *node,
GTypeFlags flags);
static void type_data_make_W (TypeNode *node,
const GTypeInfo *info,
const GTypeValueTable *value_table);
static inline void type_data_ref_Wm (TypeNode *node);
static inline void type_data_unref_U (TypeNode *node,
gboolean uncached);
static void type_data_last_unref_Wm (TypeNode * node,
gboolean uncached);
static inline gpointer type_get_qdata_L (TypeNode *node,
GQuark quark);
static inline void type_set_qdata_W (TypeNode *node,
GQuark quark,
gpointer data);
static IFaceHolder* type_iface_peek_holder_L (TypeNode *iface,
GType instance_type);
static gboolean type_iface_vtable_base_init_Wm (TypeNode *iface,
TypeNode *node);
static void type_iface_vtable_iface_init_Wm (TypeNode *iface,
TypeNode *node);
static gboolean type_node_is_a_L (TypeNode *node,
TypeNode *iface_node);
/* --- enumeration --- */
/* The InitState enumeration is used to track the progress of initializing
* both classes and interface vtables. Keeping the state of initialization
* is necessary to handle new interfaces being added while we are initializing
* the class or other interfaces.
*/
typedef enum
{
UNINITIALIZED,
BASE_CLASS_INIT,
BASE_IFACE_INIT,
CLASS_INIT,
IFACE_INIT,
INITIALIZED
} InitState;
/* --- structures --- */
struct _TypeNode
{
guint volatile ref_count;
GTypePlugin *plugin;
guint n_children; /* writable with lock */
guint n_supers : 8;
guint n_prerequisites : 9;
guint is_classed : 1;
guint is_instantiatable : 1;
guint mutatable_check_cache : 1; /* combines some common path checks */
GType *children; /* writable with lock */
TypeData * volatile data;
GQuark qname;
GData *global_gdata;
union {
GAtomicArray iface_entries; /* for !iface types */
GAtomicArray offsets;
} _prot;
GType *prerequisites;
GType supers[1]; /* flexible array */
};
#define SIZEOF_BASE_TYPE_NODE() (G_STRUCT_OFFSET (TypeNode, supers))
#define MAX_N_SUPERS (255)
#define MAX_N_CHILDREN (4095)
#define MAX_N_INTERFACES (255) /* Limited by offsets being 8 bits */
#define MAX_N_PREREQUISITES (511)
#define NODE_TYPE(node) (node->supers[0])
#define NODE_PARENT_TYPE(node) (node->supers[1])
#define NODE_FUNDAMENTAL_TYPE(node) (node->supers[node->n_supers])
#define NODE_NAME(node) (g_quark_to_string (node->qname))
#define NODE_REFCOUNT(node) ((guint) g_atomic_int_get ((int *) &(node)->ref_count))
#define NODE_IS_BOXED(node) (NODE_FUNDAMENTAL_TYPE (node) == G_TYPE_BOXED)
#define NODE_IS_IFACE(node) (NODE_FUNDAMENTAL_TYPE (node) == G_TYPE_INTERFACE)
#define CLASSED_NODE_IFACES_ENTRIES(node) (&(node)->_prot.iface_entries)
#define CLASSED_NODE_IFACES_ENTRIES_LOCKED(node)(G_ATOMIC_ARRAY_GET_LOCKED(CLASSED_NODE_IFACES_ENTRIES((node)), IFaceEntries))
#define IFACE_NODE_N_PREREQUISITES(node) ((node)->n_prerequisites)
#define IFACE_NODE_PREREQUISITES(node) ((node)->prerequisites)
#define iface_node_get_holders_L(node) ((IFaceHolder*) type_get_qdata_L ((node), static_quark_iface_holder))
#define iface_node_set_holders_W(node, holders) (type_set_qdata_W ((node), static_quark_iface_holder, (holders)))
#define iface_node_get_dependants_array_L(n) ((GType*) type_get_qdata_L ((n), static_quark_dependants_array))
#define iface_node_set_dependants_array_W(n,d) (type_set_qdata_W ((n), static_quark_dependants_array, (d)))
#define TYPE_ID_MASK ((GType) ((1 << G_TYPE_FUNDAMENTAL_SHIFT) - 1))
#define NODE_IS_ANCESTOR(ancestor, node) \
((ancestor)->n_supers <= (node)->n_supers && \
(node)->supers[(node)->n_supers - (ancestor)->n_supers] == NODE_TYPE (ancestor))
struct _IFaceHolder
{
GType instance_type;
GInterfaceInfo *info;
GTypePlugin *plugin;
IFaceHolder *next;
};
struct _IFaceEntry
{
GType iface_type;
GTypeInterface *vtable;
InitState init_state;
};
struct _IFaceEntries {
guint offset_index;
IFaceEntry entry[1];
};
#define IFACE_ENTRIES_HEADER_SIZE (sizeof(IFaceEntries) - sizeof(IFaceEntry))
#define IFACE_ENTRIES_N_ENTRIES(_entries) ( (G_ATOMIC_ARRAY_DATA_SIZE((_entries)) - IFACE_ENTRIES_HEADER_SIZE) / sizeof(IFaceEntry) )
struct _CommonData
{
GTypeValueTable *value_table;
};
struct _BoxedData
{
CommonData data;
GBoxedCopyFunc copy_func;
GBoxedFreeFunc free_func;
};
struct _IFaceData
{
CommonData common;
guint16 vtable_size;
GBaseInitFunc vtable_init_base;
GBaseFinalizeFunc vtable_finalize_base;
GClassInitFunc dflt_init;
GClassFinalizeFunc dflt_finalize;
gconstpointer dflt_data;
gpointer dflt_vtable;
};
struct _ClassData
{
CommonData common;
guint16 class_size;
guint16 class_private_size;
int volatile init_state; /* atomic - g_type_class_ref reads it unlocked */
GBaseInitFunc class_init_base;
GBaseFinalizeFunc class_finalize_base;
GClassInitFunc class_init;
GClassFinalizeFunc class_finalize;
gconstpointer class_data;
gpointer class;
};
struct _InstanceData
{
CommonData common;
guint16 class_size;
guint16 class_private_size;
int volatile init_state; /* atomic - g_type_class_ref reads it unlocked */
GBaseInitFunc class_init_base;
GBaseFinalizeFunc class_finalize_base;
GClassInitFunc class_init;
GClassFinalizeFunc class_finalize;
gconstpointer class_data;
gpointer class;
guint16 instance_size;
guint16 private_size;
guint16 n_preallocs;
GInstanceInitFunc instance_init;
};
union _TypeData
{
CommonData common;
BoxedData boxed;
IFaceData iface;
ClassData class;
InstanceData instance;
};
typedef struct {
gpointer cache_data;
GTypeClassCacheFunc cache_func;
} ClassCacheFunc;
typedef struct {
gpointer check_data;
GTypeInterfaceCheckFunc check_func;
} IFaceCheckFunc;
/* --- variables --- */
static GRWLock type_rw_lock;
static GRecMutex class_init_rec_mutex;
static guint static_n_class_cache_funcs = 0;
static ClassCacheFunc *static_class_cache_funcs = NULL;
static guint static_n_iface_check_funcs = 0;
static IFaceCheckFunc *static_iface_check_funcs = NULL;
static GQuark static_quark_type_flags = 0;
static GQuark static_quark_iface_holder = 0;
static GQuark static_quark_dependants_array = 0;
GTypeDebugFlags _g_type_debug_flags = 0;
/* --- type nodes --- */
static GHashTable *static_type_nodes_ht = NULL;
static TypeNode *static_fundamental_type_nodes[(G_TYPE_FUNDAMENTAL_MAX >> G_TYPE_FUNDAMENTAL_SHIFT) + 1] = { NULL, };
static GType static_fundamental_next = G_TYPE_RESERVED_USER_FIRST;
static inline TypeNode*
lookup_type_node_I (register GType utype)
{
if (utype > G_TYPE_FUNDAMENTAL_MAX)
return (TypeNode*) (utype & ~TYPE_ID_MASK);
else
return static_fundamental_type_nodes[utype >> G_TYPE_FUNDAMENTAL_SHIFT];
}
static TypeNode*
type_node_any_new_W (TypeNode *pnode,
GType ftype,
const gchar *name,
GTypePlugin *plugin,
GTypeFundamentalFlags type_flags)
{
guint n_supers;
GType type;
TypeNode *node;
guint i, node_size = 0;
n_supers = pnode ? pnode->n_supers + 1 : 0;
if (!pnode)
node_size += SIZEOF_FUNDAMENTAL_INFO; /* fundamental type info */
node_size += SIZEOF_BASE_TYPE_NODE (); /* TypeNode structure */
node_size += (sizeof (GType) * (1 + n_supers + 1)); /* self + ancestors + (0) for ->supers[] */
node = g_malloc0 (node_size);
if (!pnode) /* offset fundamental types */
{
node = G_STRUCT_MEMBER_P (node, SIZEOF_FUNDAMENTAL_INFO);
static_fundamental_type_nodes[ftype >> G_TYPE_FUNDAMENTAL_SHIFT] = node;
type = ftype;
}
else
type = (GType) node;
g_assert ((type & TYPE_ID_MASK) == 0);
node->n_supers = n_supers;
if (!pnode)
{
node->supers[0] = type;
node->supers[1] = 0;
node->is_classed = (type_flags & G_TYPE_FLAG_CLASSED) != 0;
node->is_instantiatable = (type_flags & G_TYPE_FLAG_INSTANTIATABLE) != 0;
if (NODE_IS_IFACE (node))
{
IFACE_NODE_N_PREREQUISITES (node) = 0;
IFACE_NODE_PREREQUISITES (node) = NULL;
}
else
_g_atomic_array_init (CLASSED_NODE_IFACES_ENTRIES (node));
}
else
{
node->supers[0] = type;
memcpy (node->supers + 1, pnode->supers, sizeof (GType) * (1 + pnode->n_supers + 1));
node->is_classed = pnode->is_classed;
node->is_instantiatable = pnode->is_instantiatable;
if (NODE_IS_IFACE (node))
{
IFACE_NODE_N_PREREQUISITES (node) = 0;
IFACE_NODE_PREREQUISITES (node) = NULL;
}
else
{
guint j;
IFaceEntries *entries;
entries = _g_atomic_array_copy (CLASSED_NODE_IFACES_ENTRIES (pnode),
IFACE_ENTRIES_HEADER_SIZE,
0);
if (entries)
{
for (j = 0; j < IFACE_ENTRIES_N_ENTRIES (entries); j++)
{
entries->entry[j].vtable = NULL;
entries->entry[j].init_state = UNINITIALIZED;
}
_g_atomic_array_update (CLASSED_NODE_IFACES_ENTRIES (node),
entries);
}
}
i = pnode->n_children++;
pnode->children = g_renew (GType, pnode->children, pnode->n_children);
pnode->children[i] = type;
}
TRACE(GOBJECT_TYPE_NEW(name, node->supers[1], type));
node->plugin = plugin;
node->n_children = 0;
node->children = NULL;
node->data = NULL;
node->qname = g_quark_from_string (name);
node->global_gdata = NULL;
g_hash_table_insert (static_type_nodes_ht,
(gpointer) g_quark_to_string (node->qname),
(gpointer) type);
return node;
}
static inline GTypeFundamentalInfo*
type_node_fundamental_info_I (TypeNode *node)
{
GType ftype = NODE_FUNDAMENTAL_TYPE (node);
if (ftype != NODE_TYPE (node))
node = lookup_type_node_I (ftype);
return node ? G_STRUCT_MEMBER_P (node, -SIZEOF_FUNDAMENTAL_INFO) : NULL;
}
static TypeNode*
type_node_fundamental_new_W (GType ftype,
const gchar *name,
GTypeFundamentalFlags type_flags)
{
GTypeFundamentalInfo *finfo;
TypeNode *node;
g_assert ((ftype & TYPE_ID_MASK) == 0);
g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX);
if (ftype >> G_TYPE_FUNDAMENTAL_SHIFT == static_fundamental_next)
static_fundamental_next++;
type_flags &= TYPE_FUNDAMENTAL_FLAG_MASK;
node = type_node_any_new_W (NULL, ftype, name, NULL, type_flags);
finfo = type_node_fundamental_info_I (node);
finfo->type_flags = type_flags;
return node;
}
static TypeNode*
type_node_new_W (TypeNode *pnode,
const gchar *name,
GTypePlugin *plugin)
{
g_assert (pnode);
g_assert (pnode->n_supers < MAX_N_SUPERS);
g_assert (pnode->n_children < MAX_N_CHILDREN);
return type_node_any_new_W (pnode, NODE_FUNDAMENTAL_TYPE (pnode), name, plugin, 0);
}
static inline IFaceEntry*
lookup_iface_entry_I (volatile IFaceEntries *entries,
TypeNode *iface_node)
{
guint8 *offsets;
guint offset_index;
IFaceEntry *check;
int index;
IFaceEntry *entry;
if (entries == NULL)
return NULL;
G_ATOMIC_ARRAY_DO_TRANSACTION
(&iface_node->_prot.offsets, guint8,
entry = NULL;
offsets = transaction_data;
offset_index = entries->offset_index;
if (offsets != NULL &&
offset_index < G_ATOMIC_ARRAY_DATA_SIZE(offsets))
{
index = offsets[offset_index];
if (index > 0)
{
/* zero means unset, subtract one to get real index */
index -= 1;
if (index < IFACE_ENTRIES_N_ENTRIES (entries))
{
check = (IFaceEntry *)&entries->entry[index];
if (check->iface_type == NODE_TYPE (iface_node))
entry = check;
}
}
}
);
return entry;
}
static inline IFaceEntry*
type_lookup_iface_entry_L (TypeNode *node,
TypeNode *iface_node)
{
if (!NODE_IS_IFACE (iface_node))
return NULL;
return lookup_iface_entry_I (CLASSED_NODE_IFACES_ENTRIES_LOCKED (node),
iface_node);
}
static inline gboolean
type_lookup_iface_vtable_I (TypeNode *node,
TypeNode *iface_node,
gpointer *vtable_ptr)
{
IFaceEntry *entry;
gboolean res;
if (!NODE_IS_IFACE (iface_node))
{
if (vtable_ptr)
*vtable_ptr = NULL;
return FALSE;
}
G_ATOMIC_ARRAY_DO_TRANSACTION
(CLASSED_NODE_IFACES_ENTRIES (node), IFaceEntries,
entry = lookup_iface_entry_I (transaction_data, iface_node);
res = entry != NULL;
if (vtable_ptr)
{
if (entry)
*vtable_ptr = entry->vtable;
else
*vtable_ptr = NULL;
}
);
return res;
}
static inline gboolean
type_lookup_prerequisite_L (TypeNode *iface,
GType prerequisite_type)
{
if (NODE_IS_IFACE (iface) && IFACE_NODE_N_PREREQUISITES (iface))
{
GType *prerequisites = IFACE_NODE_PREREQUISITES (iface) - 1;
guint n_prerequisites = IFACE_NODE_N_PREREQUISITES (iface);
do
{
guint i;
GType *check;
i = (n_prerequisites + 1) >> 1;
check = prerequisites + i;
if (prerequisite_type == *check)
return TRUE;
else if (prerequisite_type > *check)
{
n_prerequisites -= i;
prerequisites = check;
}
else /* if (prerequisite_type < *check) */
n_prerequisites = i - 1;
}
while (n_prerequisites);
}
return FALSE;
}
static const gchar*
type_descriptive_name_I (GType type)
{
if (type)
{
TypeNode *node = lookup_type_node_I (type);
return node ? NODE_NAME (node) : "<unknown>";
}
else
return "<invalid>";
}
/* --- type consistency checks --- */
static gboolean
check_plugin_U (GTypePlugin *plugin,
gboolean need_complete_type_info,
gboolean need_complete_interface_info,
const gchar *type_name)
{
/* G_IS_TYPE_PLUGIN() and G_TYPE_PLUGIN_GET_CLASS() are external calls: _U
*/
if (!plugin)
{
g_warning ("plugin handle for type `%s' is NULL",
type_name);
return FALSE;
}
if (!G_IS_TYPE_PLUGIN (plugin))
{
g_warning ("plugin pointer (%p) for type `%s' is invalid",
plugin, type_name);
return FALSE;
}
if (need_complete_type_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_type_info)
{
g_warning ("plugin for type `%s' has no complete_type_info() implementation",
type_name);
return FALSE;
}
if (need_complete_interface_info && !G_TYPE_PLUGIN_GET_CLASS (plugin)->complete_interface_info)
{
g_warning ("plugin for type `%s' has no complete_interface_info() implementation",
type_name);
return FALSE;
}
return TRUE;
}
static gboolean
check_type_name_I (const gchar *type_name)
{
static const gchar extra_chars[] = "-_+";
const gchar *p = type_name;
gboolean name_valid;
if (!type_name[0] || !type_name[1] || !type_name[2])
{
g_warning ("type name `%s' is too short", type_name);
return FALSE;
}
/* check the first letter */
name_valid = (p[0] >= 'A' && p[0] <= 'Z') || (p[0] >= 'a' && p[0] <= 'z') || p[0] == '_';
for (p = type_name + 1; *p; p++)
name_valid &= ((p[0] >= 'A' && p[0] <= 'Z') ||
(p[0] >= 'a' && p[0] <= 'z') ||
(p[0] >= '0' && p[0] <= '9') ||
strchr (extra_chars, p[0]));
if (!name_valid)
{
g_warning ("type name `%s' contains invalid characters", type_name);
return FALSE;
}
if (g_type_from_name (type_name))
{
g_warning ("cannot register existing type `%s'", type_name);
return FALSE;
}
return TRUE;
}
static gboolean
check_derivation_I (GType parent_type,
const gchar *type_name)
{
TypeNode *pnode;
GTypeFundamentalInfo* finfo;
pnode = lookup_type_node_I (parent_type);
if (!pnode)
{
g_warning ("cannot derive type `%s' from invalid parent type `%s'",
type_name,
type_descriptive_name_I (parent_type));
return FALSE;
}
finfo = type_node_fundamental_info_I (pnode);
/* ensure flat derivability */
if (!(finfo->type_flags & G_TYPE_FLAG_DERIVABLE))
{
g_warning ("cannot derive `%s' from non-derivable parent type `%s'",
type_name,
NODE_NAME (pnode));
return FALSE;
}
/* ensure deep derivability */
if (parent_type != NODE_FUNDAMENTAL_TYPE (pnode) &&
!(finfo->type_flags & G_TYPE_FLAG_DEEP_DERIVABLE))
{
g_warning ("cannot derive `%s' from non-fundamental parent type `%s'",
type_name,
NODE_NAME (pnode));
return FALSE;
}
return TRUE;
}
static gboolean
check_collect_format_I (const gchar *collect_format)
{
const gchar *p = collect_format;
gchar valid_format[] = { G_VALUE_COLLECT_INT, G_VALUE_COLLECT_LONG,
G_VALUE_COLLECT_INT64, G_VALUE_COLLECT_DOUBLE,
G_VALUE_COLLECT_POINTER, 0 };
while (*p)
if (!strchr (valid_format, *p++))
return FALSE;
return p - collect_format <= G_VALUE_COLLECT_FORMAT_MAX_LENGTH;
}
static gboolean
check_value_table_I (const gchar *type_name,
const GTypeValueTable *value_table)
{
if (!value_table)
return FALSE;
else if (value_table->value_init == NULL)
{
if (value_table->value_free || value_table->value_copy ||
value_table->value_peek_pointer ||
value_table->collect_format || value_table->collect_value ||
value_table->lcopy_format || value_table->lcopy_value)
g_warning ("cannot handle uninitializable values of type `%s'",
type_name);
return FALSE;
}
else /* value_table->value_init != NULL */
{
if (!value_table->value_free)
{
/* +++ optional +++
* g_warning ("missing `value_free()' for type `%s'", type_name);
* return FALSE;
*/
}
if (!value_table->value_copy)
{
g_warning ("missing `value_copy()' for type `%s'", type_name);
return FALSE;
}
if ((value_table->collect_format || value_table->collect_value) &&
(!value_table->collect_format || !value_table->collect_value))
{
g_warning ("one of `collect_format' and `collect_value()' is unspecified for type `%s'",
type_name);
return FALSE;
}
if (value_table->collect_format && !check_collect_format_I (value_table->collect_format))
{
g_warning ("the `%s' specification for type `%s' is too long or invalid",
"collect_format",
type_name);
return FALSE;
}
if ((value_table->lcopy_format || value_table->lcopy_value) &&
(!value_table->lcopy_format || !value_table->lcopy_value))
{
g_warning ("one of `lcopy_format' and `lcopy_value()' is unspecified for type `%s'",
type_name);
return FALSE;
}
if (value_table->lcopy_format && !check_collect_format_I (value_table->lcopy_format))
{
g_warning ("the `%s' specification for type `%s' is too long or invalid",
"lcopy_format",
type_name);
return FALSE;
}
}
return TRUE;
}
static gboolean
check_type_info_I (TypeNode *pnode,
GType ftype,
const gchar *type_name,
const GTypeInfo *info)
{
GTypeFundamentalInfo *finfo = type_node_fundamental_info_I (lookup_type_node_I (ftype));
gboolean is_interface = ftype == G_TYPE_INTERFACE;
g_assert (ftype <= G_TYPE_FUNDAMENTAL_MAX && !(ftype & TYPE_ID_MASK));
/* check instance members */
if (!(finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE) &&
(info->instance_size || info->n_preallocs || info->instance_init))
{
if (pnode)
g_warning ("cannot instantiate `%s', derived from non-instantiatable parent type `%s'",
type_name,
NODE_NAME (pnode));
else
g_warning ("cannot instantiate `%s' as non-instantiatable fundamental",
type_name);
return FALSE;
}
/* check class & interface members */
if (!((finfo->type_flags & G_TYPE_FLAG_CLASSED) || is_interface) &&
(info->class_init || info->class_finalize || info->class_data ||
info->class_size || info->base_init || info->base_finalize))
{
if (pnode)
g_warning ("cannot create class for `%s', derived from non-classed parent type `%s'",
type_name,
NODE_NAME (pnode));
else
g_warning ("cannot create class for `%s' as non-classed fundamental",
type_name);
return FALSE;
}
/* check interface size */
if (is_interface && info->class_size < sizeof (GTypeInterface))
{
g_warning ("specified interface size for type `%s' is smaller than `GTypeInterface' size",
type_name);
return FALSE;
}
/* check class size */
if (finfo->type_flags & G_TYPE_FLAG_CLASSED)
{
if (info->class_size < sizeof (GTypeClass))
{
g_warning ("specified class size for type `%s' is smaller than `GTypeClass' size",
type_name);
return FALSE;
}
if (pnode && info->class_size < pnode->data->class.class_size)
{
g_warning ("specified class size for type `%s' is smaller "
"than the parent type's `%s' class size",
type_name,
NODE_NAME (pnode));
return FALSE;
}
}
/* check instance size */
if (finfo->type_flags & G_TYPE_FLAG_INSTANTIATABLE)
{
if (info->instance_size < sizeof (GTypeInstance))
{
g_warning ("specified instance size for type `%s' is smaller than `GTypeInstance' size",
type_name);
return FALSE;
}
if (pnode && info->instance_size < pnode->data->instance.instance_size)
{
g_warning ("specified instance size for type `%s' is smaller "
"than the parent type's `%s' instance size",
type_name,
NODE_NAME (pnode));
return FALSE;
}
}
return TRUE;
}
static TypeNode*
find_conforming_child_type_L (TypeNode *pnode,
TypeNode *iface)
{
TypeNode *node = NULL;
guint i;
if (type_lookup_iface_entry_L (pnode, iface))
return pnode;
for (i = 0; i < pnode->n_children && !node; i++)
node = find_conforming_child_type_L (lookup_type_node_I (pnode->children[i]), iface);
return node;
}
static gboolean
check_add_interface_L (GType instance_type,
GType iface_type)
{
TypeNode *node = lookup_type_node_I (instance_type);
TypeNode *iface = lookup_type_node_I (iface_type);
IFaceEntry *entry;
TypeNode *tnode;
GType *prerequisites;
guint i;
if (!node || !node->is_instantiatable)
{
g_warning ("cannot add interfaces to invalid (non-instantiatable) type `%s'",
type_descriptive_name_I (instance_type));
return FALSE;
}
if (!iface || !NODE_IS_IFACE (iface))
{
g_warning ("cannot add invalid (non-interface) type `%s' to type `%s'",
type_descriptive_name_I (iface_type),
NODE_NAME (node));
return FALSE;
}
tnode = lookup_type_node_I (NODE_PARENT_TYPE (iface));
if (NODE_PARENT_TYPE (tnode) && !type_lookup_iface_entry_L (node, tnode))
{
/* 2001/7/31:timj: erk, i guess this warning is junk as interface derivation is flat */
g_warning ("cannot add sub-interface `%s' to type `%s' which does not conform to super-interface `%s'",
NODE_NAME (iface),
NODE_NAME (node),
NODE_NAME (tnode));
return FALSE;
}
/* allow overriding of interface type introduced for parent type */
entry = type_lookup_iface_entry_L (node, iface);