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glib/girepository/girepository-private.h
Adam Sampson ae33e87117 girepository: Don't assume a bitfield has a fixed size 
The type used when declaring a bitfield member of a struct doesn't
affect the amount of space allocated for it - only whether it's signed
or unsigned. In standard C99 (6.2.7.1), only _Bool, signed int and
unsigned int or typedefs to them are allowed as bitfield types, but GCC
allows other integer types as an extension.

In this case, the GIBaseInfo and GIBaseInfoStack structs are meant to
have identical layout. However, type_is_embedded was declared as an
unsigned bitfield in the former and a uint32_t in the latter. This was
harmless on most platforms because the following member is an aligned
pointer, but (for example) on m68k-linux-gnu pointers only need to be
16-bit aligned, so GCC only allocates 16 bits for the bitfield.

Change the type in the declaration to unsigned int, and add an padding
bitfield following it to ensure there's space for 32 bits on all
platforms in the future.

Signed-off-by: Adam Sampson <ats@offog.org>
2024-05-15 12:09:21 +01:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
* GObject introspection: Private headers
*
* Copyright (C) 2010 Johan Dahlin
*
* 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.
*/
#pragma once
#include <glib.h>
#define __GIREPOSITORY_H_INSIDE__
#include <girepository/gibaseinfo.h>
#include <girepository/girepository.h>
#include <girepository/gitypelib.h>
#include "gitypelib-internal.h"
/* FIXME: For now, GIRealInfo is a compatibility define. This will eventually
* be removed. */
typedef struct _GIBaseInfo GIRealInfo;
/*
* We just use one structure for all of the info object
* types; in general, we should be reading data directly
* from the typelib, and not having computed data in
* per-type structures.
*/
struct _GIBaseInfo
{
/*< private >*/
GTypeInstance parent_instance;
gatomicrefcount ref_count;
/* @repository is never reffed, as that would lead to a refcount cycle with the repository */
GIRepository *repository;
/* @container is reffed if the GIBaseInfo is heap-allocated, but not reffed if it’s stack-allocated */
GIBaseInfo *container;
GITypelib *typelib;
uint32_t offset;
unsigned int type_is_embedded : 1; /* Used by GITypeInfo */
unsigned int padding_bitfield : 31; /* For future expansion */
/* A copy of GIBaseInfo is exposed publicly for stack-allocated derivatives
* such as GITypeInfo, so its size is now ABI. */
void *padding[6];
};
G_STATIC_ASSERT (sizeof (GIBaseInfo) == sizeof (GIBaseInfoStack));
G_STATIC_ASSERT (G_ALIGNOF (GIBaseInfo) == G_ALIGNOF (GIBaseInfoStack));
/**
* GIInfoType:
* @GI_INFO_TYPE_INVALID: invalid type
* @GI_INFO_TYPE_FUNCTION: function, see [class@GIRepository.FunctionInfo]
* @GI_INFO_TYPE_CALLBACK: callback, see [class@GIRepository.FunctionInfo]
* @GI_INFO_TYPE_STRUCT: struct, see [class@GIRepository.StructInfo]
* @GI_INFO_TYPE_ENUM: enum, see [class@GIRepository.EnumInfo]
* @GI_INFO_TYPE_FLAGS: flags, see [class@GIRepository.EnumInfo]
* @GI_INFO_TYPE_OBJECT: object, see [class@GIRepository.ObjectInfo]
* @GI_INFO_TYPE_INTERFACE: interface, see [class@GIRepository.InterfaceInfo]
* @GI_INFO_TYPE_CONSTANT: constant, see [class@GIRepository.ConstantInfo]
* @GI_INFO_TYPE_UNION: union, see [class@GIRepository.UnionInfo]
* @GI_INFO_TYPE_VALUE: enum value, see [class@GIRepository.ValueInfo]
* @GI_INFO_TYPE_SIGNAL: signal, see [class@GIRepository.SignalInfo]
* @GI_INFO_TYPE_VFUNC: virtual function, see [class@GIRepository.VFuncInfo]
* @GI_INFO_TYPE_PROPERTY: [class@GObject.Object] property, see
* [class@GIRepository.PropertyInfo]
* @GI_INFO_TYPE_FIELD: struct or union field, see
* [class@GIRepository.FieldInfo]
* @GI_INFO_TYPE_ARG: argument of a function or callback, see
* [class@GIRepository.ArgInfo]
* @GI_INFO_TYPE_TYPE: type information, see [class@GIRepository.TypeInfo]
* @GI_INFO_TYPE_UNRESOLVED: unresolved type, a type which is not present in
* the typelib, or any of its dependencies, see
* [class@GIRepository.UnresolvedInfo]
* @GI_INFO_TYPE_CALLABLE: an abstract type representing any callable (function,
* callback, vfunc), see [class@GIRepository.CallableInfo]
* @GI_INFO_TYPE_REGISTERED_TYPE: an abstract type representing any registered
* type (enum, interface, object, struct, union), see
* [class@GIRepository.RegisteredTypeInfo]
*
* The type of a [class@GIRepository.BaseInfo] struct.
*
* See [const@GIRepository.INFO_TYPE_N_TYPES] for the total number of elements
* in this enum.
*
* Since: 2.80
*/
typedef enum
{
/* The values here must be kept in sync with GITypelibBlobType */
GI_INFO_TYPE_INVALID,
GI_INFO_TYPE_FUNCTION,
GI_INFO_TYPE_CALLBACK,
GI_INFO_TYPE_STRUCT,
/* 4 is skipped, it used to be BOXED, but was removed in girepository 2.80.
* It is still part of the binary format in GITypelibBlobType. */
GI_INFO_TYPE_ENUM = 5, /* 5 */
GI_INFO_TYPE_FLAGS = 6,
GI_INFO_TYPE_OBJECT = 7,
GI_INFO_TYPE_INTERFACE = 8,
GI_INFO_TYPE_CONSTANT = 9,
/* 10 is skipped, it used to be used, but was removed before girepository-2.0
* It is, however, part of the binary format in GITypelibBlobType */
GI_INFO_TYPE_UNION = 11,
GI_INFO_TYPE_VALUE = 12,
GI_INFO_TYPE_SIGNAL = 13,
GI_INFO_TYPE_VFUNC = 14,
GI_INFO_TYPE_PROPERTY = 15,
GI_INFO_TYPE_FIELD = 16,
GI_INFO_TYPE_ARG = 17,
GI_INFO_TYPE_TYPE = 18,
GI_INFO_TYPE_UNRESOLVED = 19,
GI_INFO_TYPE_CALLABLE = 20,
GI_INFO_TYPE_REGISTERED_TYPE = 21,
/* keep GI_INFO_TYPE_N_TYPES in sync with this */
} GIInfoType;
GIInfoType gi_typelib_blob_type_to_info_type (GITypelibBlobType blob_type);
/**
* GI_INFO_TYPE_N_TYPES:
*
* Number of entries in [enum@GIRepository.InfoType].
*
* Since: 2.80
*/
#define GI_INFO_TYPE_N_TYPES (GI_INFO_TYPE_REGISTERED_TYPE + 1)
const char * gi_info_type_to_string (GIInfoType type);
/* Subtypes */
struct _GICallableInfo
{
GIBaseInfo parent;
};
void gi_callable_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIFunctionInfo
{
GICallableInfo parent;
};
void gi_function_info_class_init (gpointer g_class,
gpointer class_data);
struct _GICallbackInfo
{
GICallableInfo parent;
};
void gi_callback_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIRegisteredTypeInfo
{
GIBaseInfo parent;
};
void gi_registered_type_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIStructInfo
{
GIRegisteredTypeInfo parent;
};
void gi_struct_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIUnionInfo
{
GIRegisteredTypeInfo parent;
};
void gi_union_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIEnumInfo
{
GIRegisteredTypeInfo parent;
};
void gi_enum_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIFlagsInfo
{
GIEnumInfo parent;
};
void gi_flags_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIObjectInfo
{
GIRegisteredTypeInfo parent;
};
void gi_object_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIInterfaceInfo
{
GIRegisteredTypeInfo parent;
};
void gi_interface_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIConstantInfo
{
GIBaseInfo parent;
};
void gi_constant_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIValueInfo
{
GIBaseInfo parent;
};
void gi_value_info_class_init (gpointer g_class,
gpointer class_data);
struct _GISignalInfo
{
GICallableInfo parent;
};
void gi_signal_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIVFuncInfo
{
GICallableInfo parent;
};
void gi_vfunc_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIPropertyInfo
{
GIBaseInfo parent;
};
void gi_property_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIFieldInfo
{
GIBaseInfo parent;
};
void gi_field_info_class_init (gpointer g_class,
gpointer class_data);
/* GIArgInfo is stack-allocatable so it can be used with
* gi_callable_info_load_return_type() and gi_callable_info_load_arg(), so its
* definition is actually public in gitypes.h. */
void gi_arg_info_class_init (gpointer g_class,
gpointer class_data);
/* GITypeInfo is stack-allocatable so it can be used with
* gi_arg_info_load_type_info(), so its definition is actually public in
* gitypes.h. */
void gi_type_info_class_init (gpointer g_class,
gpointer class_data);
struct _GIUnresolvedInfo
{
GIBaseInfo parent;
const char *name;
const char *namespace;
};
void gi_unresolved_info_class_init (gpointer g_class,
gpointer class_data);
void gi_info_init (GIRealInfo *info,
GType type,
GIRepository *repository,
GIBaseInfo *container,
GITypelib *typelib,
uint32_t offset);
GIBaseInfo * gi_info_from_entry (GIRepository *repository,
GITypelib *typelib,
uint16_t index);
GIBaseInfo * gi_info_new_full (GIInfoType type,
GIRepository *repository,
GIBaseInfo *container,
GITypelib *typelib,
uint32_t offset);
GITypeInfo * gi_type_info_new (GIBaseInfo *container,
GITypelib *typelib,
uint32_t offset);
void gi_type_info_init (GITypeInfo *info,
GIBaseInfo *container,
GITypelib *typelib,
uint32_t offset);
GIFunctionInfo * gi_base_info_find_method (GIBaseInfo *base,
uint32_t offset,
uint16_t n_methods,
const char *name);
GIVFuncInfo * gi_base_info_find_vfunc (GIRealInfo *rinfo,
uint32_t offset,
uint16_t n_vfuncs,
const char *name);
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