/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- * GObject introspection: Type implementation * * Copyright (C) 2005 Matthias Clasen * Copyright (C) 2008,2009 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. */ #include "config.h" #include #include #include "girepository-private.h" #include "gitypelib-internal.h" /** * SECTION:gitypeinfo * @title: GITypeInfo * @short_description: Struct representing a type * * GITypeInfo represents a type. * * You can retrieve a type info from an argument (see #GIArgInfo), a * functions return value (see #GIFunctionInfo), a field (see * #GIFieldInfo), a property (see #GIPropertyInfo), a constant * (see #GIConstantInfo) or for a union discriminator (see #GIUnionInfo). * * A type can either be a of a basic type which is a standard C primitive * type or an interface type. For interface types you need to call * g_type_info_get_interface() to get a reference to the base info for that * interface. */ /** * g_type_info_is_pointer: * @info: a #GITypeInfo * * Obtain if the type is passed as a reference. * * Note that the types of %GI_DIRECTION_OUT and %GI_DIRECTION_INOUT parameters * will only be pointers if the underlying type being transferred is a pointer * (i.e. only if the type of the C function’s formal parameter is a pointer to a * pointer). * * Returns: %TRUE if it is a pointer */ gboolean g_type_info_is_pointer (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, FALSE); g_return_val_if_fail (GI_IS_TYPE_INFO (info), FALSE); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (type->flags.reserved == 0 && type->flags.reserved2 == 0) return type->flags.pointer; else { InterfaceTypeBlob *iface = (InterfaceTypeBlob *)&rinfo->typelib->data[rinfo->offset]; return iface->pointer; } } /** * g_type_info_get_tag: * @info: a #GITypeInfo * * Obtain the type tag for the type. See #GITypeTag for a list * of type tags. * * Returns: the type tag */ GITypeTag g_type_info_get_tag (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, GI_TYPE_TAG_BOOLEAN); g_return_val_if_fail (GI_IS_TYPE_INFO (info), GI_TYPE_TAG_BOOLEAN); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (rinfo->type_is_embedded) return GI_TYPE_TAG_INTERFACE; else if (type->flags.reserved == 0 && type->flags.reserved2 == 0) return type->flags.tag; else { InterfaceTypeBlob *iface = (InterfaceTypeBlob *)&rinfo->typelib->data[rinfo->offset]; return iface->tag; } } /** * g_type_info_get_param_type: * @info: a #GITypeInfo * @n: index of the parameter * * Obtain the parameter type @n. * * Returns: (transfer full): the param type info */ GITypeInfo * g_type_info_get_param_type (GITypeInfo *info, gint n) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, NULL); g_return_val_if_fail (GI_IS_TYPE_INFO (info), NULL); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { ParamTypeBlob *param = (ParamTypeBlob *)&rinfo->typelib->data[rinfo->offset]; switch (param->tag) { case GI_TYPE_TAG_ARRAY: case GI_TYPE_TAG_GLIST: case GI_TYPE_TAG_GSLIST: case GI_TYPE_TAG_GHASH: return _g_type_info_new ((GIBaseInfo*)info, rinfo->typelib, rinfo->offset + sizeof (ParamTypeBlob) + sizeof (SimpleTypeBlob) * n); break; default: break; } } return NULL; } /** * g_type_info_get_interface: * @info: a #GITypeInfo * * For types which have #GI_TYPE_TAG_INTERFACE such as GObjects and boxed values, * this function returns full information about the referenced type. You can then * inspect the type of the returned #GIBaseInfo to further query whether it is * a concrete GObject, a GInterface, a structure, etc. using g_base_info_get_type(). * * Returns: (transfer full): the #GIBaseInfo, or %NULL. Free it with * g_base_info_unref() when done. */ GIBaseInfo * g_type_info_get_interface (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; g_return_val_if_fail (info != NULL, NULL); g_return_val_if_fail (GI_IS_TYPE_INFO (info), NULL); /* For embedded types, the given offset is a pointer to the actual blob, * after the end of the field. In that case we know it's a "subclass" of * CommonBlob, so use that to determine the info type. */ if (rinfo->type_is_embedded) { CommonBlob *common = (CommonBlob *)&rinfo->typelib->data[rinfo->offset]; GIInfoType info_type; switch (common->blob_type) { case BLOB_TYPE_CALLBACK: info_type = GI_INFO_TYPE_CALLBACK; break; default: g_assert_not_reached (); return NULL; } return (GIBaseInfo *) g_info_new (info_type, (GIBaseInfo*)info, rinfo->typelib, rinfo->offset); } else { SimpleTypeBlob *type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { InterfaceTypeBlob *blob = (InterfaceTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (blob->tag == GI_TYPE_TAG_INTERFACE) return _g_info_from_entry (rinfo->repository, rinfo->typelib, blob->interface); } } return NULL; } /** * g_type_info_get_array_length: * @info: a #GITypeInfo * * Obtain the position of the argument which gives the array length of the type. * The type tag must be a #GI_TYPE_TAG_ARRAY or -1 will be returned. * * Returns: the array length, or -1 if the type is not an array */ gint g_type_info_get_array_length (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, -1); g_return_val_if_fail (GI_IS_TYPE_INFO (info), -1); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { ArrayTypeBlob *blob = (ArrayTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (blob->tag == GI_TYPE_TAG_ARRAY) { if (blob->has_length) return blob->dimensions.length; } } return -1; } /** * g_type_info_get_array_fixed_size: * @info: a #GITypeInfo * * Obtain the fixed array size of the type. The type tag must be a * #GI_TYPE_TAG_ARRAY or -1 will be returned. * * Returns: the size or -1 if it's not an array */ gint g_type_info_get_array_fixed_size (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, 0); g_return_val_if_fail (GI_IS_TYPE_INFO (info), 0); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { ArrayTypeBlob *blob = (ArrayTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (blob->tag == GI_TYPE_TAG_ARRAY) { if (blob->has_size) return blob->dimensions.size; } } return -1; } /** * g_type_info_is_zero_terminated: * @info: a #GITypeInfo * * Obtain if the last element of the array is %NULL. The type tag must be a * #GI_TYPE_TAG_ARRAY or %FALSE will be returned. * * Returns: %TRUE if zero terminated */ gboolean g_type_info_is_zero_terminated (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, FALSE); g_return_val_if_fail (GI_IS_TYPE_INFO (info), FALSE); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { ArrayTypeBlob *blob = (ArrayTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (blob->tag == GI_TYPE_TAG_ARRAY) return blob->zero_terminated; } return FALSE; } /** * g_type_info_get_array_type: * @info: a #GITypeInfo * * Obtain the array type for this type. See #GIArrayType for a list of * possible values. If the type tag of this type is not array, -1 will be * returned. * * Returns: the array type or -1 */ GIArrayType g_type_info_get_array_type (GITypeInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; SimpleTypeBlob *type; g_return_val_if_fail (info != NULL, -1); g_return_val_if_fail (GI_IS_TYPE_INFO (info), -1); type = (SimpleTypeBlob *)&rinfo->typelib->data[rinfo->offset]; if (!(type->flags.reserved == 0 && type->flags.reserved2 == 0)) { ArrayTypeBlob *blob = (ArrayTypeBlob *)&rinfo->typelib->data[rinfo->offset]; g_return_val_if_fail (blob->tag == GI_TYPE_TAG_ARRAY, -1); return blob->array_type; } return -1; } /** * g_type_info_get_storage_type: * @info: a #GITypeInfo * * Obtain the type tag corresponding to the underlying storage type in C for * the type. * See #GITypeTag for a list of type tags. * * Returns: the type tag * * Since: 1.66 */ GITypeTag g_type_info_get_storage_type (GITypeInfo *info) { GITypeTag type_tag = g_type_info_get_tag (info); if (type_tag == GI_TYPE_TAG_INTERFACE) { GIBaseInfo *interface = g_type_info_get_interface (info); GIInfoType info_type = g_base_info_get_type (interface); if (info_type == GI_INFO_TYPE_ENUM || info_type == GI_INFO_TYPE_FLAGS) type_tag = g_enum_info_get_storage_type (interface); g_base_info_unref (interface); } return type_tag; } /** * g_type_info_argument_from_hash_pointer: * @info: a #GITypeInfo * @hash_pointer: A pointer, such as a #GHashTable data pointer * @arg: A #GIArgument to fill in * * GLib data structures, such as #GList, #GSList, and #GHashTable, all store * data pointers. * In the case where the list or hash table is storing single types rather than * structs, these data pointers may have values stuffed into them via macros * such as %GPOINTER_TO_INT. * * Use this function to ensure that all values are correctly extracted from * stuffed pointers, regardless of the machine's architecture or endianness. * * This function fills in the appropriate field of @arg with the value extracted * from @hash_pointer, depending on the storage type of @info. * * Since: 1.66 */ void g_type_info_argument_from_hash_pointer (GITypeInfo *info, gpointer hash_pointer, GIArgument *arg) { GITypeTag type_tag = g_type_info_get_storage_type (info); switch (type_tag) { case GI_TYPE_TAG_BOOLEAN: arg->v_boolean = !!GPOINTER_TO_INT (hash_pointer); break; case GI_TYPE_TAG_INT8: arg->v_int8 = (gint8)GPOINTER_TO_INT (hash_pointer); break; case GI_TYPE_TAG_UINT8: arg->v_uint8 = (guint8)GPOINTER_TO_UINT (hash_pointer); break; case GI_TYPE_TAG_INT16: arg->v_int16 = (gint16)GPOINTER_TO_INT (hash_pointer); break; case GI_TYPE_TAG_UINT16: arg->v_uint16 = (guint16)GPOINTER_TO_UINT (hash_pointer); break; case GI_TYPE_TAG_INT32: arg->v_int32 = (gint32)GPOINTER_TO_INT (hash_pointer); break; case GI_TYPE_TAG_UINT32: case GI_TYPE_TAG_UNICHAR: arg->v_uint32 = (guint32)GPOINTER_TO_UINT (hash_pointer); break; case GI_TYPE_TAG_GTYPE: arg->v_size = GPOINTER_TO_SIZE (hash_pointer); break; case GI_TYPE_TAG_UTF8: case GI_TYPE_TAG_FILENAME: case GI_TYPE_TAG_INTERFACE: case GI_TYPE_TAG_ARRAY: case GI_TYPE_TAG_GLIST: case GI_TYPE_TAG_GSLIST: case GI_TYPE_TAG_GHASH: case GI_TYPE_TAG_ERROR: arg->v_pointer = hash_pointer; break; case GI_TYPE_TAG_INT64: case GI_TYPE_TAG_UINT64: case GI_TYPE_TAG_FLOAT: case GI_TYPE_TAG_DOUBLE: default: g_critical ("Unsupported type for pointer-stuffing: %s", g_type_tag_to_string (type_tag)); arg->v_pointer = hash_pointer; } } /** * g_type_info_hash_pointer_from_argument: * @info: a #GITypeInfo * @arg: A #GIArgument with the value to stuff into a pointer * * GLib data structures, such as #GList, #GSList, and #GHashTable, all store * data pointers. * In the case where the list or hash table is storing single types rather than * structs, these data pointers may have values stuffed into them via macros * such as %GPOINTER_TO_INT. * * Use this function to ensure that all values are correctly stuffed into * pointers, regardless of the machine's architecture or endianness. * * This function returns a pointer stuffed with the appropriate field of @arg, * depending on the storage type of @info. * * Returns: A stuffed pointer, that can be stored in a #GHashTable, for example * * Since: 1.66 */ gpointer g_type_info_hash_pointer_from_argument (GITypeInfo *info, GIArgument *arg) { GITypeTag type_tag = g_type_info_get_storage_type (info); switch (type_tag) { case GI_TYPE_TAG_BOOLEAN: return GINT_TO_POINTER (arg->v_boolean); case GI_TYPE_TAG_INT8: return GINT_TO_POINTER (arg->v_int8); case GI_TYPE_TAG_UINT8: return GUINT_TO_POINTER (arg->v_uint8); case GI_TYPE_TAG_INT16: return GINT_TO_POINTER (arg->v_int16); case GI_TYPE_TAG_UINT16: return GUINT_TO_POINTER (arg->v_uint16); case GI_TYPE_TAG_INT32: return GINT_TO_POINTER (arg->v_int32); case GI_TYPE_TAG_UINT32: case GI_TYPE_TAG_UNICHAR: return GUINT_TO_POINTER (arg->v_uint32); case GI_TYPE_TAG_GTYPE: return GSIZE_TO_POINTER (arg->v_size); case GI_TYPE_TAG_UTF8: case GI_TYPE_TAG_FILENAME: case GI_TYPE_TAG_INTERFACE: case GI_TYPE_TAG_ARRAY: case GI_TYPE_TAG_GLIST: case GI_TYPE_TAG_GSLIST: case GI_TYPE_TAG_GHASH: case GI_TYPE_TAG_ERROR: return arg->v_pointer; case GI_TYPE_TAG_INT64: case GI_TYPE_TAG_UINT64: case GI_TYPE_TAG_FLOAT: case GI_TYPE_TAG_DOUBLE: default: g_critical ("Unsupported type for pointer-stuffing: %s", g_type_tag_to_string (type_tag)); return arg->v_pointer; } }