luc14n0/glib
1
0
Fork 0
mirror of https://gitlab.gnome.org/GNOME/glib.git synced 2024-11-06 01:16:17 +01:00
Code Issues Packages Projects Releases Wiki Activity
fe6f9a661b
glib/girepository/gitypeinfo.c
Philip Withnall fe6f9a661b gitypeinfo: Change gi_type_info_get_array_length_index() to return uint 
Rather than mixing `-1` and valid indexes, split out the indication of
whether the type is an array with a length argument from the actual
index of the length argument.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Helps: #3155
2024-01-16 23:26:02 +00:00

644 lines
20 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* -*- 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.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 <glib.h>
#include <girepository/girepository.h>
#include "gibaseinfo-private.h"
#include "girepository-private.h"
#include "gitypelib-internal.h"
#include "gitypeinfo.h"
/**
* GITypeInfo:
*
* `GITypeInfo` represents a type, including information about direction and
* transfer.
*
* You can retrieve a type info from an argument (see
* [class@GIRepository.ArgInfo]), a function’s return value (see
* [class@GIRepository.FunctionInfo]), a field (see
* [class@GIRepository.FieldInfo]), a property (see
* [class@GIRepository.PropertyInfo]), a constant (see
* [class@GIRepository.ConstantInfo]) or for a union discriminator (see
* [class@GIRepository.UnionInfo]).
*
* 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
* [method@GIRepository.TypeInfo.get_interface] to get a reference to the base
* info for that interface.
*
* Since: 2.80
*/
/**
* gi_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
* Since: 2.80
*/
gboolean
gi_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;
}
}
/**
* gi_type_info_get_tag:
* @info: a #GITypeInfo
*
* Obtain the type tag for the type.
*
* See [type@GIRepository.TypeTag] for a list of type tags.
*
* Returns: the type tag
* Since: 2.80
*/
GITypeTag
gi_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;
}
}
/**
* gi_type_info_get_param_type:
* @info: a #GITypeInfo
* @n: index of the parameter
*
* Obtain the parameter type @n, or `NULL` if the type is not an array.
*
* Returns: (transfer full) (nullable): the param type info, or `NULL` if the
* type is not an array
* Since: 2.80
*/
GITypeInfo *
gi_type_info_get_param_type (GITypeInfo *info,
unsigned int 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 gi_type_info_new ((GIBaseInfo*)info, rinfo->typelib,
rinfo->offset + sizeof (ParamTypeBlob)
+ sizeof (SimpleTypeBlob) * n);
break;
default:
break;
}
}
return NULL;
}
/**
* gi_type_info_get_interface:
* @info: a #GITypeInfo
*
* For types which have `GI_TYPE_TAG_INTERFACE` such as [class@GObject.Object]s
* and boxed values, this function returns full information about the referenced
* type.
*
* You can then inspect the type of the returned [class@GIRepository.BaseInfo]
* to further query whether it is a concrete [class@GObject.Object], an
* interface, a structure, etc., using
* [method@GIRepository.BaseInfo.get_info_type].
*
* Returns: (transfer full) (nullable): The [class@GIRepository.BaseInfo], or
* `NULL`. Free it with gi_base_info_unref() when done.
* Since: 2.80
*/
GIBaseInfo *
gi_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 *) gi_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 gi_info_from_entry (rinfo->repository, rinfo->typelib, blob->interface);
}
}
return NULL;
}
/**
* gi_type_info_get_array_length_index:
* @info: a #GITypeInfo
* @out_length_index: (out) (optional): return location for the length argument
*
* Obtain the position of the argument which gives the array length of the type.
*
* The type tag must be a `GI_TYPE_TAG_ARRAY` with a length argument, or `FALSE`
* will be returned.
*
* Returns: `TRUE` if the type is an array and has a length argument
* Since: 2.80
*/
gboolean
gi_type_info_get_array_length_index (GITypeInfo *info,
unsigned int *out_length_index)
{
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)
{
if (blob->has_length)
{
if (out_length_index != NULL)
*out_length_index = blob->dimensions.length;
return TRUE;
}
}
}
if (out_length_index != NULL)
*out_length_index = 0;
return FALSE;
}
/**
* gi_type_info_get_array_fixed_size:
* @info: a #GITypeInfo
* @out_size: (out) (optional): return location for the array size
*
* Obtain the fixed array size of the type, in number of elements (not bytes).
*
* The type tag must be a `GI_TYPE_TAG_ARRAY` with a fixed size, or `FALSE` will
* be returned.
*
* Returns: `TRUE` if the type is an array and has a fixed size
* Since: 2.80
*/
gboolean
gi_type_info_get_array_fixed_size (GITypeInfo *info,
size_t *out_size)
{
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)
{
if (blob->has_size)
{
if (out_size != NULL)
*out_size = blob->dimensions.size;
return TRUE;
}
}
}
if (out_size != NULL)
*out_size = 0;
return FALSE;
}
/**
* gi_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
* Since: 2.80
*/
gboolean
gi_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;
}
/**
* gi_type_info_get_array_type:
* @info: a #GITypeInfo
*
* Obtain the array type for this type.
*
* See [enum@GIRepository.ArrayType] for a list of possible values.
*
* It is an error to call this on an @info which is not an array type. Use
* [method@GIRepository.TypeInfo.get_tag] to check.
*
* Returns: the array type
* Since: 2.80
*/
GIArrayType
gi_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;
}
/* Not an array type */
g_assert_not_reached ();
}
/**
* gi_type_info_get_storage_type:
* @info: a #GITypeInfo
*
* Obtain the type tag corresponding to the underlying storage type in C for
* the type.
*
* See [type@GIRepository.TypeTag] for a list of type tags.
*
* Returns: the type tag
* Since: 2.80
*/
GITypeTag
gi_type_info_get_storage_type (GITypeInfo *info)
{
GITypeTag type_tag = gi_type_info_get_tag (info);
if (type_tag == GI_TYPE_TAG_INTERFACE)
{
GIBaseInfo *interface = gi_type_info_get_interface (info);
GIInfoType info_type = gi_base_info_get_info_type (interface);
if (info_type == GI_INFO_TYPE_ENUM || info_type == GI_INFO_TYPE_FLAGS)
type_tag = gi_enum_info_get_storage_type ((GIEnumInfo *) interface);
gi_base_info_unref (interface);
}
return type_tag;
}
/**
* gi_type_tag_argument_from_hash_pointer:
* @storage_type: a [type@GIRepository.TypeTag] obtained from
* [method@GIRepository.TypeInfo.get_storage_type]
* @hash_pointer: a pointer, such as a [struct@GLib.HashTable] data pointer
* @arg: (out caller-allocates) (not nullable): a [type@GIRepository.Argument]
* to fill in
*
* Convert a data pointer from a GLib data structure to a
* [type@GIRepository.Argument].
*
* GLib data structures, such as [type@GLib.List], [type@GLib.SList], and
* [type@GLib.HashTable], 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 @storage_type.
*
* Since: 2.80
*/
void
gi_type_tag_argument_from_hash_pointer (GITypeTag storage_type,
void *hash_pointer,
GIArgument *arg)
{
switch (storage_type)
{
case GI_TYPE_TAG_BOOLEAN:
arg->v_boolean = !!GPOINTER_TO_INT (hash_pointer);
break;
case GI_TYPE_TAG_INT8:
arg->v_int8 = (int8_t) GPOINTER_TO_INT (hash_pointer);
break;
case GI_TYPE_TAG_UINT8:
arg->v_uint8 = (uint8_t) GPOINTER_TO_UINT (hash_pointer);
break;
case GI_TYPE_TAG_INT16:
arg->v_int16 = (int16_t) GPOINTER_TO_INT (hash_pointer);
break;
case GI_TYPE_TAG_UINT16:
arg->v_uint16 = (uint16_t) GPOINTER_TO_UINT (hash_pointer);
break;
case GI_TYPE_TAG_INT32:
arg->v_int32 = (int32_t) GPOINTER_TO_INT (hash_pointer);
break;
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_UNICHAR:
arg->v_uint32 = (uint32_t) 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 storage type for pointer-stuffing: %s",
gi_type_tag_to_string (storage_type));
arg->v_pointer = hash_pointer;
}
}
/**
* gi_type_info_argument_from_hash_pointer:
* @info: a #GITypeInfo
* @hash_pointer: a pointer, such as a [struct@GLib.HashTable] data pointer
* @arg: (out caller-allocates): a [type@GIRepository.Argument] to fill in
*
* Convert a data pointer from a GLib data structure to a
* [type@GIRepository.Argument].
*
* GLib data structures, such as [type@GLib.List], [type@GLib.SList], and
* [type@GLib.HashTable], 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: 2.80
*/
void
gi_type_info_argument_from_hash_pointer (GITypeInfo *info,
void *hash_pointer,
GIArgument *arg)
{
GITypeTag storage_type = gi_type_info_get_storage_type (info);
gi_type_tag_argument_from_hash_pointer (storage_type, hash_pointer,
arg);
}
/**
* gi_type_tag_hash_pointer_from_argument:
* @storage_type: a [type@GIRepository.TypeTag] obtained from
* [method@GIRepository.TypeInfo.get_storage_type]
* @arg: a [type@GIRepository.Argument] with the value to stuff into a pointer
*
* Convert a [type@GIRepository.Argument] to data pointer for use in a GLib
* data structure.
*
* GLib data structures, such as [type@GLib.List], [type@GLib.SList], and
* [type@GLib.HashTable], 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 @storage_type.
*
* Returns: A stuffed pointer, that can be stored in a [struct@GLib.HashTable],
* for example
* Since: 2.80
*/
void *
gi_type_tag_hash_pointer_from_argument (GITypeTag storage_type,
GIArgument *arg)
{
switch (storage_type)
{
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 storage type for pointer-stuffing: %s",
gi_type_tag_to_string (storage_type));
return arg->v_pointer;
}
}
/**
* gi_type_info_hash_pointer_from_argument:
* @info: a #GITypeInfo
* @arg: a [struct@GIRepository.Argument] with the value to stuff into a pointer
*
* Convert a [type@GIRepository.Argument] to data pointer for use in a GLib
* data structure.
*
* GLib data structures, such as [type@GLib.List], [type@GLib.SList], and
* [type@GLib.HashTable], 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 [struct@GLib.HashTable],
* for example
* Since: 2.80
*/
void *
gi_type_info_hash_pointer_from_argument (GITypeInfo *info,
GIArgument *arg)
{
GITypeTag storage_type = gi_type_info_get_storage_type (info);
return gi_type_tag_hash_pointer_from_argument (storage_type, arg);
}
void
gi_type_info_class_init (gpointer g_class,
gpointer class_data)
{
GIBaseInfoClass *info_class = g_class;
info_class->info_type = GI_INFO_TYPE_TYPE;
}
Reference in New Issue View Git Blame Copy Permalink