LCOV - code coverage report
Current view: top level - glib/girepository - giunioninfo.c (source / functions) Hit Total Coverage
Test: unnamed Lines: 76 85 89.4 %
Date: 2024-05-07 05:15:23 Functions: 14 14 100.0 %
Branches: 6 12 50.0 %

           Branch data     Line data    Source code
       1                 :            : /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
       2                 :            :  * GObject introspection: Union implementation
       3                 :            :  *
       4                 :            :  * Copyright (C) 2005 Matthias Clasen
       5                 :            :  * Copyright (C) 2008,2009 Red Hat, Inc.
       6                 :            :  *
       7                 :            :  * SPDX-License-Identifier: LGPL-2.1-or-later
       8                 :            :  *
       9                 :            :  * This library is free software; you can redistribute it and/or
      10                 :            :  * modify it under the terms of the GNU Lesser General Public
      11                 :            :  * License as published by the Free Software Foundation; either
      12                 :            :  * version 2 of the License, or (at your option) any later version.
      13                 :            :  *
      14                 :            :  * This library is distributed in the hope that it will be useful,
      15                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17                 :            :  * Lesser General Public License for more details.
      18                 :            :  *
      19                 :            :  * You should have received a copy of the GNU Lesser General Public
      20                 :            :  * License along with this library; if not, write to the
      21                 :            :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      22                 :            :  * Boston, MA 02111-1307, USA.
      23                 :            :  */
      24                 :            : 
      25                 :            : #include "config.h"
      26                 :            : 
      27                 :            : #include <glib.h>
      28                 :            : 
      29                 :            : #include <girepository/girepository.h>
      30                 :            : #include "gibaseinfo-private.h"
      31                 :            : #include "girepository-private.h"
      32                 :            : #include "gitypelib-internal.h"
      33                 :            : #include "giunioninfo.h"
      34                 :            : 
      35                 :            : /**
      36                 :            :  * GIUnionInfo:
      37                 :            :  *
      38                 :            :  * `GIUnionInfo` represents a union type.
      39                 :            :  *
      40                 :            :  * A union has methods and fields.  Unions can optionally have a
      41                 :            :  * discriminator, which is a field deciding what type of real union
      42                 :            :  * fields is valid for specified instance.
      43                 :            :  *
      44                 :            :  * Since: 2.80
      45                 :            :  */
      46                 :            : 
      47                 :            : /**
      48                 :            :  * gi_union_info_get_n_fields:
      49                 :            :  * @info: a #GIUnionInfo
      50                 :            :  *
      51                 :            :  * Obtain the number of fields this union has.
      52                 :            :  *
      53                 :            :  * Returns: number of fields
      54                 :            :  * Since: 2.80
      55                 :            :  */
      56                 :            : unsigned int
      57                 :          1 : gi_union_info_get_n_fields  (GIUnionInfo *info)
      58                 :            : {
      59                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
      60                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
      61                 :            : 
      62                 :          1 :   return blob->n_fields;
      63                 :            : }
      64                 :            : 
      65                 :            : /**
      66                 :            :  * gi_union_info_get_field:
      67                 :            :  * @info: a #GIUnionInfo
      68                 :            :  * @n: a field index
      69                 :            :  *
      70                 :            :  * Obtain the type information for the field with the specified index.
      71                 :            :  *
      72                 :            :  * Returns: (transfer full): the [type@GIRepository.FieldInfo], free it with
      73                 :            :  *   [method@GIRepository.BaseInfo.unref] when done.
      74                 :            :  * Since: 2.80
      75                 :            :  */
      76                 :            : GIFieldInfo *
      77                 :          1 : gi_union_info_get_field (GIUnionInfo *info,
      78                 :            :                          unsigned int n)
      79                 :            : {
      80                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
      81                 :          1 :   Header *header = (Header *)rinfo->typelib->data;
      82                 :            : 
      83                 :          2 :   return (GIFieldInfo *) gi_base_info_new (GI_INFO_TYPE_FIELD, (GIBaseInfo*)info, rinfo->typelib,
      84                 :          1 :                                            rinfo->offset + header->union_blob_size +
      85                 :          1 :                                            n * header->field_blob_size);
      86                 :            : }
      87                 :            : 
      88                 :            : /**
      89                 :            :  * gi_union_info_get_n_methods:
      90                 :            :  * @info: a #GIUnionInfo
      91                 :            :  *
      92                 :            :  * Obtain the number of methods this union has.
      93                 :            :  *
      94                 :            :  * Returns: number of methods
      95                 :            :  * Since: 2.80
      96                 :            :  */
      97                 :            : unsigned int
      98                 :          2 : gi_union_info_get_n_methods (GIUnionInfo *info)
      99                 :            : {
     100                 :          2 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     101                 :          2 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     102                 :            : 
     103                 :          2 :   return blob->n_functions;
     104                 :            : }
     105                 :            : 
     106                 :            : /**
     107                 :            :  * gi_union_info_get_method:
     108                 :            :  * @info: a #GIUnionInfo
     109                 :            :  * @n: a method index
     110                 :            :  *
     111                 :            :  * Obtain the type information for the method with the specified index.
     112                 :            :  *
     113                 :            :  * Returns: (transfer full): the [type@GIRepository.FunctionInfo], free it
     114                 :            :  *   with [method@GIRepository.BaseInfo.unref] when done.
     115                 :            :  * Since: 2.80
     116                 :            :  */
     117                 :            : GIFunctionInfo *
     118                 :          1 : gi_union_info_get_method (GIUnionInfo *info,
     119                 :            :                           unsigned int n)
     120                 :            : {
     121                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     122                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     123                 :          1 :   Header *header = (Header *)rinfo->typelib->data;
     124                 :            :   size_t offset;
     125                 :            : 
     126                 :          1 :   offset = rinfo->offset + header->union_blob_size
     127                 :          1 :     + blob->n_fields * header->field_blob_size
     128                 :          1 :     + n * header->function_blob_size;
     129                 :          1 :   return (GIFunctionInfo *) gi_base_info_new (GI_INFO_TYPE_FUNCTION, (GIBaseInfo*)info,
     130                 :            :                                               rinfo->typelib, offset);
     131                 :            : }
     132                 :            : 
     133                 :            : /**
     134                 :            :  * gi_union_info_is_discriminated:
     135                 :            :  * @info: a #GIUnionInfo
     136                 :            :  *
     137                 :            :  * Return `TRUE` if this union contains a discriminator field.
     138                 :            :  *
     139                 :            :  * Returns: `TRUE` if this is a discriminated union, `FALSE` otherwise
     140                 :            :  * Since: 2.80
     141                 :            :  */
     142                 :            : gboolean
     143                 :          1 : gi_union_info_is_discriminated (GIUnionInfo *info)
     144                 :            : {
     145                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     146                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     147                 :            : 
     148                 :          1 :   return blob->discriminated;
     149                 :            : }
     150                 :            : 
     151                 :            : /**
     152                 :            :  * gi_union_info_get_discriminator_offset:
     153                 :            :  * @info: a #GIUnionInfo
     154                 :            :  * @out_offset: (out) (optional): return location for the offset, in bytes, of
     155                 :            :  *   the discriminator
     156                 :            :  *
     157                 :            :  * Obtain the offset of the discriminator field within the structure.
     158                 :            :  *
     159                 :            :  * The union must be discriminated, or `FALSE` will be returned.
     160                 :            :  *
     161                 :            :  * Returns: `TRUE` if the union is discriminated
     162                 :            :  * Since: 2.80
     163                 :            :  */
     164                 :            : gboolean
     165                 :          1 : gi_union_info_get_discriminator_offset (GIUnionInfo *info,
     166                 :            :                                         size_t      *out_offset)
     167                 :            : {
     168                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     169                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     170                 :            :   size_t discriminator_offset;
     171                 :            : 
     172         [ -  + ]:          1 :   discriminator_offset = (blob->discriminated) ? blob->discriminator_offset : 0;
     173                 :            : 
     174         [ +  - ]:          1 :   if (out_offset != NULL)
     175                 :          1 :     *out_offset = discriminator_offset;
     176                 :            : 
     177                 :          1 :   return blob->discriminated;
     178                 :            : }
     179                 :            : 
     180                 :            : /**
     181                 :            :  * gi_union_info_get_discriminator_type:
     182                 :            :  * @info: a #GIUnionInfo
     183                 :            :  *
     184                 :            :  * Obtain the type information of the union discriminator.
     185                 :            :  *
     186                 :            :  * Returns: (transfer full) (nullable): the [type@GIRepository.TypeInfo], or
     187                 :            :  *   `NULL` if the union is not discriminated. Free it with
     188                 :            :  *   [method@GIRepository.BaseInfo.unref] when done.
     189                 :            :  * Since: 2.80
     190                 :            :  */
     191                 :            : GITypeInfo *
     192                 :          1 : gi_union_info_get_discriminator_type (GIUnionInfo *info)
     193                 :            : {
     194                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     195                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     196                 :            : 
     197         [ +  - ]:          1 :   if (!blob->discriminated)
     198                 :          1 :     return NULL;
     199                 :            : 
     200                 :          0 :   return gi_type_info_new ((GIBaseInfo*)info, rinfo->typelib, rinfo->offset + 24);
     201                 :            : }
     202                 :            : 
     203                 :            : /**
     204                 :            :  * gi_union_info_get_discriminator:
     205                 :            :  * @info: a #GIUnionInfo
     206                 :            :  * @n: a union field index
     207                 :            :  *
     208                 :            :  * Obtain the discriminator value assigned for n-th union field, i.e. the n-th
     209                 :            :  * union field is the active one if the discriminator contains this
     210                 :            :  * constant.
     211                 :            :  *
     212                 :            :  * If the union is not discriminated, `NULL` is returned.
     213                 :            :  *
     214                 :            :  * Returns: (transfer full) (nullable): The [type@GIRepository.ConstantInfo], or
     215                 :            :  *   `NULL` if the union is not discriminated. Free it with
     216                 :            :  *   [method@GIRepository.BaseInfo.unref] when done.
     217                 :            :  * Since: 2.80
     218                 :            :  */
     219                 :            : GIConstantInfo *
     220                 :          1 : gi_union_info_get_discriminator (GIUnionInfo *info,
     221                 :            :                                  size_t       n)
     222                 :            : {
     223                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     224                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     225                 :            : 
     226         [ -  + ]:          1 :   if (blob->discriminated)
     227                 :            :     {
     228                 :          0 :       Header *header = (Header *)rinfo->typelib->data;
     229                 :            :       size_t offset;
     230                 :            : 
     231                 :          0 :       offset = rinfo->offset + header->union_blob_size
     232                 :          0 :         + blob->n_fields * header->field_blob_size
     233                 :          0 :         + blob->n_functions * header->function_blob_size
     234                 :          0 :         + n * header->constant_blob_size;
     235                 :            : 
     236                 :          0 :       return (GIConstantInfo *) gi_base_info_new (GI_INFO_TYPE_CONSTANT, (GIBaseInfo*)info,
     237                 :            :                                                   rinfo->typelib, offset);
     238                 :            :     }
     239                 :            : 
     240                 :          1 :   return NULL;
     241                 :            : }
     242                 :            : 
     243                 :            : /**
     244                 :            :  * gi_union_info_find_method:
     245                 :            :  * @info: a #GIUnionInfo
     246                 :            :  * @name: a method name
     247                 :            :  *
     248                 :            :  * Obtain the type information for the method named @name.
     249                 :            :  *
     250                 :            :  * Returns: (transfer full) (nullable): The [type@GIRepository.FunctionInfo], or
     251                 :            :  *   `NULL` if none was found. Free it with [method@GIRepository.BaseInfo.unref]
     252                 :            :  *   when done.
     253                 :            :  * Since: 2.80
     254                 :            :  */
     255                 :            : GIFunctionInfo *
     256                 :          2 : gi_union_info_find_method (GIUnionInfo *info,
     257                 :            :                            const char  *name)
     258                 :            : {
     259                 :            :   size_t offset;
     260                 :          2 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     261                 :          2 :   Header *header = (Header *)rinfo->typelib->data;
     262                 :          2 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     263                 :            : 
     264                 :          2 :   offset = rinfo->offset + header->union_blob_size
     265                 :          2 :     + blob->n_fields * header->field_blob_size;
     266                 :            : 
     267                 :          2 :   return gi_base_info_find_method ((GIBaseInfo*)info, offset, blob->n_functions, name);
     268                 :            : }
     269                 :            : 
     270                 :            : /**
     271                 :            :  * gi_union_info_get_size:
     272                 :            :  * @info: a #GIUnionInfo
     273                 :            :  *
     274                 :            :  * Obtain the total size of the union.
     275                 :            :  *
     276                 :            :  * Returns: size of the union, in bytes
     277                 :            :  * Since: 2.80
     278                 :            :  */
     279                 :            : size_t
     280                 :          1 : gi_union_info_get_size (GIUnionInfo *info)
     281                 :            : {
     282                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     283                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     284                 :            : 
     285                 :          1 :   return blob->size;
     286                 :            : }
     287                 :            : 
     288                 :            : /**
     289                 :            :  * gi_union_info_get_alignment:
     290                 :            :  * @info: a #GIUnionInfo
     291                 :            :  *
     292                 :            :  * Obtain the required alignment of the union.
     293                 :            :  *
     294                 :            :  * Returns: required alignment, in bytes
     295                 :            :  * Since: 2.80
     296                 :            :  */
     297                 :            : size_t
     298                 :          1 : gi_union_info_get_alignment (GIUnionInfo *info)
     299                 :            : {
     300                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     301                 :          1 :   UnionBlob *blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     302                 :            : 
     303                 :          1 :   return blob->alignment;
     304                 :            : }
     305                 :            : 
     306                 :            : /**
     307                 :            :  * gi_union_info_get_copy_function_name:
     308                 :            :  * @info: a union information blob
     309                 :            :  *
     310                 :            :  * Retrieves the name of the copy function for @info, if any is set.
     311                 :            :  *
     312                 :            :  * Returns: (transfer none) (nullable): the name of the copy function, or `NULL`
     313                 :            :  *   if none is set
     314                 :            :  * Since: 2.80
     315                 :            :  */
     316                 :            : const char *
     317                 :          1 : gi_union_info_get_copy_function_name (GIUnionInfo *info)
     318                 :            : {
     319                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     320                 :            :   UnionBlob *blob;
     321                 :            : 
     322                 :          1 :   g_return_val_if_fail (info != NULL, NULL);
     323                 :          1 :   g_return_val_if_fail (GI_IS_UNION_INFO (info), NULL);
     324                 :            : 
     325                 :          1 :   blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     326                 :            : 
     327         [ -  + ]:          1 :   if (blob->copy_func)
     328                 :          0 :     return gi_typelib_get_string (rinfo->typelib, blob->copy_func);
     329                 :            : 
     330                 :          1 :   return NULL;
     331                 :            : }
     332                 :            : 
     333                 :            : /**
     334                 :            :  * gi_union_info_get_free_function_name:
     335                 :            :  * @info: a union information blob
     336                 :            :  *
     337                 :            :  * Retrieves the name of the free function for @info, if any is set.
     338                 :            :  *
     339                 :            :  * Returns: (transfer none) (nullable): the name of the free function, or `NULL`
     340                 :            :  *   if none is set
     341                 :            :  * Since: 2.80
     342                 :            :  */
     343                 :            : const char *
     344                 :          1 : gi_union_info_get_free_function_name (GIUnionInfo *info)
     345                 :            : {
     346                 :          1 :   GIRealInfo *rinfo = (GIRealInfo *)info;
     347                 :            :   UnionBlob *blob;
     348                 :            : 
     349                 :          1 :   g_return_val_if_fail (info != NULL, NULL);
     350                 :          1 :   g_return_val_if_fail (GI_IS_UNION_INFO (info), NULL);
     351                 :            : 
     352                 :          1 :   blob = (UnionBlob *)&rinfo->typelib->data[rinfo->offset];
     353                 :            : 
     354         [ -  + ]:          1 :   if (blob->free_func)
     355                 :          0 :     return gi_typelib_get_string (rinfo->typelib, blob->free_func);
     356                 :            : 
     357                 :          1 :   return NULL;
     358                 :            : }
     359                 :            : 
     360                 :            : void
     361                 :          4 : gi_union_info_class_init (gpointer g_class,
     362                 :            :                           gpointer class_data)
     363                 :            : {
     364                 :          4 :   GIBaseInfoClass *info_class = g_class;
     365                 :            : 
     366                 :          4 :   info_class->info_type = GI_INFO_TYPE_UNION;
     367                 :          4 : }

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