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glib/girepository/gifieldinfo.c
Philip Withnall ec36370dcb
girepository: Fix various implicit conversions from size_t to smaller types 
Basically various trivial instances of the following MSVC compiler
warning:
```
../gio/gio-tool-set.c(50): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data
```

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
2024-04-25 00:41:34 +01:00

576 lines
19 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
* GObject introspection: Field 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 "config.h"
#include "gifieldinfo.h"
/**
* GIFieldInfo:
*
* A `GIFieldInfo` struct represents a field of a struct, union, or object.
*
* The `GIFieldInfo` is fetched by calling
* [method@GIRepository.StructInfo.get_field],
* [method@GIRepository.UnionInfo.get_field] or
* [method@GIRepository.ObjectInfo.get_field].
*
* A field has a size, type and a struct offset associated and a set of flags,
* which are currently `GI_FIELD_IS_READABLE` or `GI_FIELD_IS_WRITABLE`.
*
* See also: [type@GIRepository.StructInfo], [type@GIRepository.UnionInfo],
* [type@GIRepository.ObjectInfo]
*
* Since: 2.80
*/
/**
* gi_field_info_get_flags:
* @info: a #GIFieldInfo
*
* Obtain the flags for this `GIFieldInfo`. See
* [flags@GIRepository.FieldInfoFlags] for possible flag values.
*
* Returns: the flags
* Since: 2.80
*/
GIFieldInfoFlags
gi_field_info_get_flags (GIFieldInfo *info)
{
GIFieldInfoFlags flags;
GIRealInfo *rinfo = (GIRealInfo *)info;
FieldBlob *blob;
g_return_val_if_fail (info != NULL, 0);
g_return_val_if_fail (GI_IS_FIELD_INFO (info), 0);
blob = (FieldBlob *)&rinfo->typelib->data[rinfo->offset];
flags = 0;
if (blob->readable)
flags = flags | GI_FIELD_IS_READABLE;
if (blob->writable)
flags = flags | GI_FIELD_IS_WRITABLE;
return flags;
}
/**
* gi_field_info_get_size:
* @info: a #GIFieldInfo
*
* Obtain the size of the field member, in bits. This is how
* much space you need to allocate to store the field.
*
* Returns: the field size, in bits
* Since: 2.80
*/
size_t
gi_field_info_get_size (GIFieldInfo *info)
{
GIRealInfo *rinfo = (GIRealInfo *)info;
FieldBlob *blob;
g_return_val_if_fail (info != NULL, 0);
g_return_val_if_fail (GI_IS_FIELD_INFO (info), 0);
blob = (FieldBlob *)&rinfo->typelib->data[rinfo->offset];
return blob->bits;
}
/**
* gi_field_info_get_offset:
* @info: a #GIFieldInfo
*
* Obtain the offset of the field member, in bytes. This is relative
* to the beginning of the struct or union.
*
* Returns: the field offset, in bytes
* Since: 2.80
*/
size_t
gi_field_info_get_offset (GIFieldInfo *info)
{
GIRealInfo *rinfo = (GIRealInfo *)info;
FieldBlob *blob;
g_return_val_if_fail (info != NULL, 0);
g_return_val_if_fail (GI_IS_FIELD_INFO (info), 0);
blob = (FieldBlob *)&rinfo->typelib->data[rinfo->offset];
return blob->struct_offset;
}
/**
* gi_field_info_get_type_info:
* @info: a #GIFieldInfo
*
* Obtain the type of a field as a [type@GIRepository.TypeInfo].
*
* Returns: (transfer full): the [type@GIRepository.TypeInfo]. Free the struct
* by calling [method@GIRepository.BaseInfo.unref] when done.
* Since: 2.80
*/
GITypeInfo *
gi_field_info_get_type_info (GIFieldInfo *info)
{
GIRealInfo *rinfo = (GIRealInfo *)info;
Header *header = (Header *)rinfo->typelib->data;
FieldBlob *blob;
GIRealInfo *type_info;
g_return_val_if_fail (info != NULL, NULL);
g_return_val_if_fail (GI_IS_FIELD_INFO (info), NULL);
blob = (FieldBlob *)&rinfo->typelib->data[rinfo->offset];
if (blob->has_embedded_type)
{
type_info = (GIRealInfo *) gi_base_info_new (GI_INFO_TYPE_TYPE,
(GIBaseInfo*)info, rinfo->typelib,
rinfo->offset + header->field_blob_size);
type_info->type_is_embedded = TRUE;
}
else
return gi_type_info_new ((GIBaseInfo*)info, rinfo->typelib, rinfo->offset + G_STRUCT_OFFSET (FieldBlob, type));
return (GITypeInfo *) type_info;
}
/**
* gi_field_info_get_field: (skip)
* @field_info: a #GIFieldInfo
* @mem: pointer to a block of memory representing a C structure or union
* @value: a [type@GIRepository.Argument] into which to store the value retrieved
*
* Reads a field identified by a `GIFieldInfo` from a C structure or
* union.
*
* This only handles fields of simple C types. It will fail for a field of a
* composite type like a nested structure or union even if that is actually
* readable.
*
* Returns: `TRUE` if reading the field succeeded, `FALSE` otherwise
* Since: 2.80
*/
gboolean
gi_field_info_get_field (GIFieldInfo *field_info,
void *mem,
GIArgument *value)
{
size_t offset;
GITypeInfo *type_info;
gboolean result = FALSE;
g_return_val_if_fail (field_info != NULL, FALSE);
g_return_val_if_fail (GI_IS_FIELD_INFO (field_info), FALSE);
if ((gi_field_info_get_flags (field_info) & GI_FIELD_IS_READABLE) == 0)
return FALSE;
offset = gi_field_info_get_offset (field_info);
type_info = gi_field_info_get_type_info (field_info);
if (gi_type_info_is_pointer (type_info))
{
value->v_pointer = G_STRUCT_MEMBER (void *, mem, offset);
result = TRUE;
}
else
{
switch (gi_type_info_get_tag (type_info))
{
case GI_TYPE_TAG_VOID:
g_warning("Field %s: should not be have void type",
gi_base_info_get_name ((GIBaseInfo *)field_info));
break;
case GI_TYPE_TAG_BOOLEAN:
value->v_boolean = G_STRUCT_MEMBER (gboolean, mem, offset) != FALSE;
result = TRUE;
break;
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
value->v_uint8 = G_STRUCT_MEMBER (uint8_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
value->v_uint16 = G_STRUCT_MEMBER (uint16_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_UNICHAR:
value->v_uint32 = G_STRUCT_MEMBER (uint32_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
value->v_uint64 = G_STRUCT_MEMBER (uint64_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_GTYPE:
value->v_size = G_STRUCT_MEMBER (size_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_FLOAT:
value->v_float = G_STRUCT_MEMBER (float, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_DOUBLE:
value->v_double = G_STRUCT_MEMBER (double, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_ARRAY:
/* We don't check the array type and that it is fixed-size,
we trust gi-compile-repository to do the right thing */
value->v_pointer = G_STRUCT_MEMBER_P (mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_UTF8:
case GI_TYPE_TAG_FILENAME:
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
case GI_TYPE_TAG_GHASH:
g_warning("Field %s: type %s should have is_pointer set",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_type_tag_to_string (gi_type_info_get_tag (type_info)));
break;
case GI_TYPE_TAG_ERROR:
/* Needs to be handled by the language binding directly */
break;
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface = gi_type_info_get_interface (type_info);
switch (gi_base_info_get_info_type (interface))
{
case GI_INFO_TYPE_STRUCT:
case GI_INFO_TYPE_UNION:
/* Needs to be handled by the language binding directly */
break;
case GI_INFO_TYPE_OBJECT:
break;
case GI_INFO_TYPE_ENUM:
case GI_INFO_TYPE_FLAGS:
{
/* FIXME: there's a mismatch here between the value->v_int we use
* here and the int64_t result returned from gi_value_info_get_value().
* But to switch this to int64_t, we'd have to make gi_function_info_invoke()
* translate value->v_int64 to the proper ABI for an enum function
* call parameter, which will usually be int, and then fix up language
* bindings.
*/
GITypeTag storage_type = gi_enum_info_get_storage_type ((GIEnumInfo *)interface);
switch (storage_type)
{
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
value->v_int = (int)G_STRUCT_MEMBER (uint8_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
value->v_int = (int)G_STRUCT_MEMBER (uint16_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
value->v_int = (int)G_STRUCT_MEMBER (uint32_t, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
value->v_int = (int)G_STRUCT_MEMBER (uint64_t, mem, offset);
result = TRUE;
break;
default:
g_warning("Field %s: Unexpected enum storage type %s",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_type_tag_to_string (storage_type));
break;
}
break;
}
case GI_INFO_TYPE_VFUNC:
case GI_INFO_TYPE_CALLBACK:
g_warning("Field %s: Interface type %d should have is_pointer set",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_base_info_get_info_type (interface));
break;
case GI_INFO_TYPE_INVALID:
case GI_INFO_TYPE_INTERFACE:
case GI_INFO_TYPE_FUNCTION:
case GI_INFO_TYPE_CONSTANT:
case GI_INFO_TYPE_VALUE:
case GI_INFO_TYPE_SIGNAL:
case GI_INFO_TYPE_PROPERTY:
case GI_INFO_TYPE_FIELD:
case GI_INFO_TYPE_ARG:
case GI_INFO_TYPE_TYPE:
case GI_INFO_TYPE_UNRESOLVED:
g_warning("Field %s: Interface type %d not expected",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_base_info_get_info_type (interface));
break;
default:
break;
}
gi_base_info_unref ((GIBaseInfo *)interface);
break;
}
break;
default:
break;
}
}
gi_base_info_unref ((GIBaseInfo *)type_info);
return result;
}
/**
* gi_field_info_set_field: (skip)
* @field_info: a #GIFieldInfo
* @mem: pointer to a block of memory representing a C structure or union
* @value: a [type@GIRepository.Argument] holding the value to store
*
* Writes a field identified by a `GIFieldInfo` to a C structure or
* union.
*
* This only handles fields of simple C types. It will fail for a field of a
* composite type like a nested structure or union even if that is actually
* writable. Note also that that it will refuse to write fields where memory
* management would by required. A field with a type such as `char *` must be
* set with a setter function.
*
* Returns: `TRUE` if writing the field succeeded, `FALSE` otherwise
* Since: 2.80
*/
gboolean
gi_field_info_set_field (GIFieldInfo *field_info,
void *mem,
const GIArgument *value)
{
size_t offset;
GITypeInfo *type_info;
gboolean result = FALSE;
g_return_val_if_fail (field_info != NULL, FALSE);
g_return_val_if_fail (GI_IS_FIELD_INFO (field_info), FALSE);
if ((gi_field_info_get_flags (field_info) & GI_FIELD_IS_WRITABLE) == 0)
return FALSE;
offset = gi_field_info_get_offset (field_info);
type_info = gi_field_info_get_type_info (field_info);
if (!gi_type_info_is_pointer (type_info))
{
switch (gi_type_info_get_tag (type_info))
{
case GI_TYPE_TAG_VOID:
g_warning("Field %s: should not be have void type",
gi_base_info_get_name ((GIBaseInfo *)field_info));
break;
case GI_TYPE_TAG_BOOLEAN:
G_STRUCT_MEMBER (gboolean, mem, offset) = value->v_boolean != FALSE;
result = TRUE;
break;
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
G_STRUCT_MEMBER (uint8_t, mem, offset) = value->v_uint8;
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
G_STRUCT_MEMBER (uint16_t, mem, offset) = value->v_uint16;
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_UNICHAR:
G_STRUCT_MEMBER (uint32_t, mem, offset) = value->v_uint32;
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
G_STRUCT_MEMBER (uint64_t, mem, offset) = value->v_uint64;
result = TRUE;
break;
case GI_TYPE_TAG_GTYPE:
G_STRUCT_MEMBER (size_t, mem, offset) = value->v_size;
result = TRUE;
break;
case GI_TYPE_TAG_FLOAT:
G_STRUCT_MEMBER (float, mem, offset) = value->v_float;
result = TRUE;
break;
case GI_TYPE_TAG_DOUBLE:
G_STRUCT_MEMBER (double, mem, offset)= value->v_double;
result = TRUE;
break;
case GI_TYPE_TAG_UTF8:
case GI_TYPE_TAG_FILENAME:
case GI_TYPE_TAG_ARRAY:
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
case GI_TYPE_TAG_GHASH:
g_warning("Field %s: type %s should have is_pointer set",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_type_tag_to_string (gi_type_info_get_tag (type_info)));
break;
case GI_TYPE_TAG_ERROR:
/* Needs to be handled by the language binding directly */
break;
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface = gi_type_info_get_interface (type_info);
switch (gi_base_info_get_info_type (interface))
{
case GI_INFO_TYPE_STRUCT:
case GI_INFO_TYPE_UNION:
/* Needs to be handled by the language binding directly */
break;
case GI_INFO_TYPE_OBJECT:
break;
case GI_INFO_TYPE_ENUM:
case GI_INFO_TYPE_FLAGS:
{
/* See FIXME above
*/
GITypeTag storage_type = gi_enum_info_get_storage_type ((GIEnumInfo *)interface);
switch (storage_type)
{
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
G_STRUCT_MEMBER (uint8_t, mem, offset) = (uint8_t)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
G_STRUCT_MEMBER (uint16_t, mem, offset) = (uint16_t)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
G_STRUCT_MEMBER (uint32_t, mem, offset) = (uint32_t)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
G_STRUCT_MEMBER (uint64_t, mem, offset) = (uint64_t)value->v_int;
result = TRUE;
break;
default:
g_warning("Field %s: Unexpected enum storage type %s",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_type_tag_to_string (storage_type));
break;
}
break;
}
break;
case GI_INFO_TYPE_VFUNC:
case GI_INFO_TYPE_CALLBACK:
g_warning("Field%s: Interface type %d should have is_pointer set",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_base_info_get_info_type (interface));
break;
case GI_INFO_TYPE_INVALID:
case GI_INFO_TYPE_INTERFACE:
case GI_INFO_TYPE_FUNCTION:
case GI_INFO_TYPE_CONSTANT:
case GI_INFO_TYPE_VALUE:
case GI_INFO_TYPE_SIGNAL:
case GI_INFO_TYPE_PROPERTY:
case GI_INFO_TYPE_FIELD:
case GI_INFO_TYPE_ARG:
case GI_INFO_TYPE_TYPE:
case GI_INFO_TYPE_UNRESOLVED:
g_warning("Field %s: Interface type %d not expected",
gi_base_info_get_name ((GIBaseInfo *)field_info),
gi_base_info_get_info_type (interface));
break;
default:
break;
}
gi_base_info_unref ((GIBaseInfo *)interface);
break;
}
break;
default:
break;
}
} else {
switch (gi_type_info_get_tag (type_info))
{
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface = gi_type_info_get_interface (type_info);
switch (gi_base_info_get_info_type (interface))
{
case GI_INFO_TYPE_OBJECT:
case GI_INFO_TYPE_INTERFACE:
G_STRUCT_MEMBER (void *, mem, offset) = (void *)value->v_pointer;
result = TRUE;
break;
default:
break;
}
gi_base_info_unref ((GIBaseInfo *)interface);
}
break;
default:
break;
}
}
gi_base_info_unref ((GIBaseInfo *)type_info);
return result;
}
void
gi_field_info_class_init (gpointer g_class,
gpointer class_data)
{
GIBaseInfoClass *info_class = g_class;
info_class->info_type = GI_INFO_TYPE_FIELD;
}
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