/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- * GObject introspection: Union 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 #include #include "girepository-private.h" #include "gitypelib-internal.h" /** * SECTION:giunioninfo * @title: GIUnionInfo * @short_description: Struct representing a union. * * GIUnionInfo represents a union type. * * A union has methods and fields. Unions can optionally have a * discriminator, which is a field deciding what type of real union * fields is valid for specified instance. * * * Struct hierarchy * * GIBaseInfo * +----GIRegisteredTypeInfo * +----GIUnionInfo * * */ /** * g_union_info_get_n_fields: * @info: a #GIUnionInfo * * Obtain the number of fields this union has. * * Returns: number of fields */ gint g_union_info_get_n_fields (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->n_fields; } /** * g_union_info_get_field: * @info: a #GIUnionInfo * @n: a field index * * Obtain the type information for field with specified index. * * Returns: (transfer full): the #GIFieldInfo, free it with g_base_info_unref() * when done. */ GIFieldInfo * g_union_info_get_field (GIUnionInfo *info, gint n) { GIRealInfo *rinfo = (GIRealInfo *)info; Header *header = (Header *)rinfo->typelib->data; return (GIFieldInfo *) g_info_new (GI_INFO_TYPE_FIELD, (GIBaseInfo*)info, rinfo->typelib, rinfo->offset + header->union_blob_size + n * header->field_blob_size); } /** * g_union_info_get_n_methods: * @info: a #GIUnionInfo * * Obtain the number of methods this union has. * * Returns: number of methods */ gint g_union_info_get_n_methods (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->n_functions; } /** * g_union_info_get_method: * @info: a #GIUnionInfo * @n: a method index * * Obtain the type information for method with specified index. * * Returns: (transfer full): the #GIFunctionInfo, free it with g_base_info_unref() * when done. */ GIFunctionInfo * g_union_info_get_method (GIUnionInfo *info, gint n) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; Header *header = (Header *)rinfo->typelib->data; gint offset; offset = rinfo->offset + header->union_blob_size + blob->n_fields * header->field_blob_size + n * header->function_blob_size; return (GIFunctionInfo *) g_info_new (GI_INFO_TYPE_FUNCTION, (GIBaseInfo*)info, rinfo->typelib, offset); } /** * g_union_info_is_discriminated: * @info: a #GIUnionInfo * * Return true if this union contains discriminator field. * * Returns: %TRUE if this is a discriminated union, %FALSE otherwise */ gboolean g_union_info_is_discriminated (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->discriminated; } /** * g_union_info_get_discriminator_offset: * @info: a #GIUnionInfo * * Returns offset of the discriminator field in the structure. * * Returns: (transfer full): offset in bytes of the discriminator */ gint g_union_info_get_discriminator_offset (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->discriminator_offset; } /** * g_union_info_get_discriminator_type: * @info: a #GIUnionInfo * * Obtain the type information of the union discriminator. * * Returns: (transfer full): the #GITypeInfo, free it with g_base_info_unref() * when done. */ GITypeInfo * g_union_info_get_discriminator_type (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; return _g_type_info_new ((GIBaseInfo*)info, rinfo->typelib, rinfo->offset + 24); } /** * g_union_info_get_discriminator: * @info: a #GIUnionInfo * @n: a union field index * * Obtain discriminator value assigned for n-th union field, i.e. n-th * union field is the active one if discriminator contains this * constant. * * Returns: (transfer full): the #GIConstantInfo, free it with g_base_info_unref() * when done. */ GIConstantInfo * g_union_info_get_discriminator (GIUnionInfo *info, gint n) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; if (blob->discriminated) { Header *header = (Header *)rinfo->typelib->data; gint offset; offset = rinfo->offset + header->union_blob_size + blob->n_fields * header->field_blob_size + blob->n_functions * header->function_blob_size + n * header->constant_blob_size; return (GIConstantInfo *) g_info_new (GI_INFO_TYPE_CONSTANT, (GIBaseInfo*)info, rinfo->typelib, offset); } return NULL; } /** * g_union_info_find_method: * @info: a #GIUnionInfo * @name: a method name * * Obtain the type information for method named @name. * * Returns: (transfer full): the #GIFunctionInfo, free it with g_base_info_unref() * when done. */ GIFunctionInfo * g_union_info_find_method (GIUnionInfo *info, const gchar *name) { gint offset; GIRealInfo *rinfo = (GIRealInfo *)info; Header *header = (Header *)rinfo->typelib->data; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; offset = rinfo->offset + header->union_blob_size + blob->n_fields * header->field_blob_size; return _g_base_info_find_method ((GIBaseInfo*)info, offset, blob->n_functions, name); } /** * g_union_info_get_size: * @info: a #GIUnionInfo * * Obtain the total size of the union. * * Returns: size of the union in bytes */ gsize g_union_info_get_size (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->size; } /** * g_union_info_get_alignment: * @info: a #GIUnionInfo * * Obtain the required alignment of the union. * * Returns: required alignment in bytes */ gsize g_union_info_get_alignment (GIUnionInfo *info) { GIRealInfo *rinfo = (GIRealInfo *)info; UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset]; return blob->alignment; }