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glib/gio/gdbusmethodinvocation.c
Ryan Lortie edf16aace4 GDBusMethodInvocation: add missing 'goto out' 
We do a bunch of new validity checks for return values in response to
calls on the D-Bus property API but we miss the 'goto out' in one case.
Add it.

https://bugzilla.gnome.org/show_bug.cgi?id=698375
2013-06-22 13:41:12 -04:00

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26 KiB
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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 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.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include "gdbusutils.h"
#include "gdbusconnection.h"
#include "gdbusmessage.h"
#include "gdbusmethodinvocation.h"
#include "gdbusintrospection.h"
#include "gdbuserror.h"
#include "gdbusprivate.h"
#ifdef G_OS_UNIX
#include "gunixfdlist.h"
#endif
#include "glibintl.h"
/**
* SECTION:gdbusmethodinvocation
* @short_description: Object for handling remote calls
* @include: gio/gio.h
*
* Instances of the #GDBusMethodInvocation class are used when
* handling D-Bus method calls. It provides a way to asynchronously
* return results and errors.
*
* The normal way to obtain a #GDBusMethodInvocation object is to receive
* it as an argument to the handle_method_call() function in a
* #GDBusInterfaceVTable that was passed to g_dbus_connection_register_object().
*/
typedef struct _GDBusMethodInvocationClass GDBusMethodInvocationClass;
/**
* GDBusMethodInvocationClass:
*
* Class structure for #GDBusMethodInvocation.
*
* Since: 2.26
*/
struct _GDBusMethodInvocationClass
{
/*< private >*/
GObjectClass parent_class;
};
/**
* GDBusMethodInvocation:
*
* The #GDBusMethodInvocation structure contains only private data and
* should only be accessed using the provided API.
*
* Since: 2.26
*/
struct _GDBusMethodInvocation
{
/*< private >*/
GObject parent_instance;
/* construct-only properties */
gchar *sender;
gchar *object_path;
gchar *interface_name;
gchar *method_name;
GDBusMethodInfo *method_info;
GDBusPropertyInfo *property_info;
GDBusConnection *connection;
GDBusMessage *message;
GVariant *parameters;
gpointer user_data;
};
G_DEFINE_TYPE (GDBusMethodInvocation, g_dbus_method_invocation, G_TYPE_OBJECT);
static void
g_dbus_method_invocation_finalize (GObject *object)
{
GDBusMethodInvocation *invocation = G_DBUS_METHOD_INVOCATION (object);
g_free (invocation->sender);
g_free (invocation->object_path);
g_free (invocation->interface_name);
g_free (invocation->method_name);
if (invocation->method_info)
g_dbus_method_info_unref (invocation->method_info);
g_object_unref (invocation->connection);
g_object_unref (invocation->message);
g_variant_unref (invocation->parameters);
G_OBJECT_CLASS (g_dbus_method_invocation_parent_class)->finalize (object);
}
static void
g_dbus_method_invocation_class_init (GDBusMethodInvocationClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_method_invocation_finalize;
}
static void
g_dbus_method_invocation_init (GDBusMethodInvocation *invocation)
{
}
/**
* g_dbus_method_invocation_get_sender:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the bus name that invoked the method.
*
* Returns: A string. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
const gchar *
g_dbus_method_invocation_get_sender (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->sender;
}
/**
* g_dbus_method_invocation_get_object_path:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the object path the method was invoked on.
*
* Returns: A string. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
const gchar *
g_dbus_method_invocation_get_object_path (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->object_path;
}
/**
* g_dbus_method_invocation_get_interface_name:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the name of the D-Bus interface the method was invoked on.
*
* If this method call is a property Get, Set or GetAll call that has
* been redirected to the method call handler then
* "org.freedesktop.DBus.Properties" will be returned. See
* #GDBusInterfaceVTable for more information.
*
* Returns: A string. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
const gchar *
g_dbus_method_invocation_get_interface_name (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->interface_name;
}
/**
* g_dbus_method_invocation_get_method_info:
* @invocation: A #GDBusMethodInvocation.
*
* Gets information about the method call, if any.
*
* If this method invocation is a property Get, Set or GetAll call that
* has been redirected to the method call handler then %NULL will be
* returned. See g_dbus_method_invocation_get_property_info() and
* #GDBusInterfaceVTable for more information.
*
* Returns: A #GDBusMethodInfo or %NULL. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
const GDBusMethodInfo *
g_dbus_method_invocation_get_method_info (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->method_info;
}
/**
* g_dbus_method_invocation_get_property_info:
* @invocation: A #GDBusMethodInvocation
*
* Gets information about the property that this method call is for, if
* any.
*
* This will only be set in the case of an invocation in response to a
* property Get or Set call that has been directed to the method call
* handler for an object on account of its property_get() or
* property_set() vtable pointers being unset.
*
* See #GDBusInterfaceVTable for more information.
*
* If the call was GetAll, %NULL will be returned.
*
* Returns: (transfer none): a #GDBusPropertyInfo or %NULL
*
* Since: 2.38
*/
const GDBusPropertyInfo *
g_dbus_method_invocation_get_property_info (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->property_info;
}
/**
* g_dbus_method_invocation_get_method_name:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the name of the method that was invoked.
*
* Returns: A string. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
const gchar *
g_dbus_method_invocation_get_method_name (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->method_name;
}
/**
* g_dbus_method_invocation_get_connection:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the #GDBusConnection the method was invoked on.
*
* Returns: (transfer none):A #GDBusConnection. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_method_invocation_get_connection (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->connection;
}
/**
* g_dbus_method_invocation_get_message:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the #GDBusMessage for the method invocation. This is useful if
* you need to use low-level protocol features, such as UNIX file
* descriptor passing, that cannot be properly expressed in the
* #GVariant API.
*
* See <xref linkend="gdbus-server"/> and <xref
* linkend="gdbus-unix-fd-client"/> for an example of how to use this
* low-level API to send and receive UNIX file descriptors.
*
* Returns: (transfer none): #GDBusMessage. Do not free, it is owned by @invocation.
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_method_invocation_get_message (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->message;
}
/**
* g_dbus_method_invocation_get_parameters:
* @invocation: A #GDBusMethodInvocation.
*
* Gets the parameters of the method invocation. If there are no input
* parameters then this will return a GVariant with 0 children rather than NULL.
*
* Returns: (transfer none): A #GVariant tuple. Do not unref this because it is owned by @invocation.
*
* Since: 2.26
*/
GVariant *
g_dbus_method_invocation_get_parameters (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->parameters;
}
/**
* g_dbus_method_invocation_get_user_data: (skip)
* @invocation: A #GDBusMethodInvocation.
*
* Gets the @user_data #gpointer passed to g_dbus_connection_register_object().
*
* Returns: A #gpointer.
*
* Since: 2.26
*/
gpointer
g_dbus_method_invocation_get_user_data (GDBusMethodInvocation *invocation)
{
g_return_val_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation), NULL);
return invocation->user_data;
}
/* < internal >
* _g_dbus_method_invocation_new:
* @sender: (allow-none): The bus name that invoked the method or %NULL if @connection is not a bus connection.
* @object_path: The object path the method was invoked on.
* @interface_name: The name of the D-Bus interface the method was invoked on.
* @method_name: The name of the method that was invoked.
* @method_info: (allow-none): Information about the method call or %NULL.
* @property_info: (allow-none): Information about the property or %NULL.
* @connection: The #GDBusConnection the method was invoked on.
* @message: The D-Bus message as a #GDBusMessage.
* @parameters: The parameters as a #GVariant tuple.
* @user_data: The @user_data #gpointer passed to g_dbus_connection_register_object().
*
* Creates a new #GDBusMethodInvocation object.
*
* Returns: A #GDBusMethodInvocation. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusMethodInvocation *
_g_dbus_method_invocation_new (const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
const GDBusMethodInfo *method_info,
const GDBusPropertyInfo *property_info,
GDBusConnection *connection,
GDBusMessage *message,
GVariant *parameters,
gpointer user_data)
{
GDBusMethodInvocation *invocation;
g_return_val_if_fail (sender == NULL || g_dbus_is_name (sender), NULL);
g_return_val_if_fail (g_variant_is_object_path (object_path), NULL);
g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), NULL);
g_return_val_if_fail (g_dbus_is_member_name (method_name), NULL);
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
g_return_val_if_fail (g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL);
invocation = G_DBUS_METHOD_INVOCATION (g_object_new (G_TYPE_DBUS_METHOD_INVOCATION, NULL));
invocation->sender = g_strdup (sender);
invocation->object_path = g_strdup (object_path);
invocation->interface_name = g_strdup (interface_name);
invocation->method_name = g_strdup (method_name);
if (method_info)
invocation->method_info = g_dbus_method_info_ref ((GDBusMethodInfo *)method_info);
if (property_info)
invocation->property_info = g_dbus_property_info_ref ((GDBusPropertyInfo *)property_info);
invocation->connection = g_object_ref (connection);
invocation->message = g_object_ref (message);
invocation->parameters = g_variant_ref (parameters);
invocation->user_data = user_data;
return invocation;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
g_dbus_method_invocation_return_value_internal (GDBusMethodInvocation *invocation,
GVariant *parameters,
GUnixFDList *fd_list)
{
GDBusMessage *reply;
GError *error;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE));
if (parameters == NULL)
parameters = g_variant_new_tuple (NULL, 0);
/* if we have introspection data, check that the signature of @parameters is correct */
if (invocation->method_info != NULL)
{
GVariantType *type;
type = _g_dbus_compute_complete_signature (invocation->method_info->out_args);
if (!g_variant_is_of_type (parameters, type))
{
gchar *type_string = g_variant_type_dup_string (type);
g_warning ("Type of return value is incorrect: expected '%s', got '%s''",
type_string, g_variant_get_type_string (parameters));
g_variant_type_free (type);
g_free (type_string);
goto out;
}
g_variant_type_free (type);
}
/* property_info is only non-NULL if set that way from
* GDBusConnection, so this must be the case of async property
* handling on either 'Get', 'Set' or 'GetAll'.
*/
if (invocation->property_info != NULL)
{
if (g_str_equal (invocation->method_name, "Get"))
{
GVariant *nested;
if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(v)")))
{
g_warning ("Type of return value for property 'Get' call should be '(v)' but got '%s'",
g_variant_get_type_string (parameters));
goto out;
}
/* Go deeper and make sure that the value inside of the
* variant matches the property type.
*/
g_variant_get (parameters, "(v)", &nested);
if (!g_str_equal (g_variant_get_type_string (nested), invocation->property_info->signature))
{
g_warning ("Value returned from property 'Get' call for '%s' should be '%s' but is '%s'",
invocation->property_info->name, invocation->property_info->signature,
g_variant_get_type_string (nested));
g_variant_unref (nested);
goto out;
}
g_variant_unref (nested);
}
else if (g_str_equal (invocation->method_name, "GetAll"))
{
if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(a{sv})")))
{
g_warning ("Type of return value for property 'GetAll' call should be '(a{sv})' but got '%s'",
g_variant_get_type_string (parameters));
goto out;
}
/* Could iterate the list of properties and make sure that all
* of them are actually on the interface and with the correct
* types, but let's not do that for now...
*/
}
else if (g_str_equal (invocation->method_name, "Set"))
{
if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE_UNIT))
{
g_warning ("Type of return value for property 'Set' call should be '()' but got '%s'",
g_variant_get_type_string (parameters));
goto out;
}
}
else
g_assert_not_reached ();
}
if (G_UNLIKELY (_g_dbus_debug_return ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Return:\n"
" >>>> METHOD RETURN\n"
" in response to %s.%s()\n"
" on object %s\n"
" to name %s\n"
" reply-serial %d\n",
invocation->interface_name, invocation->method_name,
invocation->object_path,
invocation->sender,
g_dbus_message_get_serial (invocation->message));
_g_dbus_debug_print_unlock ();
}
reply = g_dbus_message_new_method_reply (invocation->message);
g_dbus_message_set_body (reply, parameters);
#ifdef G_OS_UNIX
if (fd_list != NULL)
g_dbus_message_set_unix_fd_list (reply, fd_list);
#endif
error = NULL;
if (!g_dbus_connection_send_message (g_dbus_method_invocation_get_connection (invocation), reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, &error))
{
g_warning ("Error sending message: %s", error->message);
g_error_free (error);
}
g_object_unref (reply);
out:
g_object_unref (invocation);
}
/**
* g_dbus_method_invocation_return_value:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @parameters: (allow-none): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
*
* Finishes handling a D-Bus method call by returning @parameters.
* If the @parameters GVariant is floating, it is consumed.
*
* It is an error if @parameters is not of the right format.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_value (GDBusMethodInvocation *invocation,
GVariant *parameters)
{
g_dbus_method_invocation_return_value_internal (invocation, parameters, NULL);
}
#ifdef G_OS_UNIX
/**
* g_dbus_method_invocation_return_value_with_unix_fd_list:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @parameters: (allow-none): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
* @fd_list: (allow-none): A #GUnixFDList or %NULL.
*
* Like g_dbus_method_invocation_return_value() but also takes a #GUnixFDList.
*
* This method is only available on UNIX.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.30
*/
void
g_dbus_method_invocation_return_value_with_unix_fd_list (GDBusMethodInvocation *invocation,
GVariant *parameters,
GUnixFDList *fd_list)
{
g_dbus_method_invocation_return_value_internal (invocation, parameters, fd_list);
}
#endif
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_method_invocation_return_error:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @domain: A #GQuark for the #GError error domain.
* @code: The error code.
* @format: printf()-style format.
* @...: Parameters for @format.
*
* Finishes handling a D-Bus method call by returning an error.
*
* See g_dbus_error_encode_gerror() for details about what error name
* will be returned on the wire. In a nutshell, if the given error is
* registered using g_dbus_error_register_error() the name given
* during registration is used. Otherwise, a name of the form
* <literal>org.gtk.GDBus.UnmappedGError.Quark...</literal> is
* used. This provides transparent mapping of #GError between
* applications using GDBus.
*
* If you are writing an application intended to be portable,
* <emphasis>always</emphasis> register errors with g_dbus_error_register_error()
* or use g_dbus_method_invocation_return_dbus_error().
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_error (GDBusMethodInvocation *invocation,
GQuark domain,
gint code,
const gchar *format,
...)
{
va_list var_args;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (format != NULL);
va_start (var_args, format);
g_dbus_method_invocation_return_error_valist (invocation,
domain,
code,
format,
var_args);
va_end (var_args);
}
/**
* g_dbus_method_invocation_return_error_valist:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @domain: A #GQuark for the #GError error domain.
* @code: The error code.
* @format: printf()-style format.
* @var_args: #va_list of parameters for @format.
*
* Like g_dbus_method_invocation_return_error() but intended for
* language bindings.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_error_valist (GDBusMethodInvocation *invocation,
GQuark domain,
gint code,
const gchar *format,
va_list var_args)
{
gchar *literal_message;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (format != NULL);
literal_message = g_strdup_vprintf (format, var_args);
g_dbus_method_invocation_return_error_literal (invocation,
domain,
code,
literal_message);
g_free (literal_message);
}
/**
* g_dbus_method_invocation_return_error_literal:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @domain: A #GQuark for the #GError error domain.
* @code: The error code.
* @message: The error message.
*
* Like g_dbus_method_invocation_return_error() but without printf()-style formatting.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_error_literal (GDBusMethodInvocation *invocation,
GQuark domain,
gint code,
const gchar *message)
{
GError *error;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (message != NULL);
error = g_error_new_literal (domain, code, message);
g_dbus_method_invocation_return_gerror (invocation, error);
g_error_free (error);
}
/**
* g_dbus_method_invocation_return_gerror:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @error: A #GError.
*
* Like g_dbus_method_invocation_return_error() but takes a #GError
* instead of the error domain, error code and message.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_gerror (GDBusMethodInvocation *invocation,
const GError *error)
{
gchar *dbus_error_name;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (error != NULL);
dbus_error_name = g_dbus_error_encode_gerror (error);
g_dbus_method_invocation_return_dbus_error (invocation,
dbus_error_name,
error->message);
g_free (dbus_error_name);
}
/**
* g_dbus_method_invocation_take_error: (skip)
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @error: (transfer full): A #GError.
*
* Like g_dbus_method_invocation_return_gerror() but takes ownership
* of @error so the caller does not need to free it.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.30
*/
void
g_dbus_method_invocation_take_error (GDBusMethodInvocation *invocation,
GError *error)
{
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (error != NULL);
g_dbus_method_invocation_return_gerror (invocation, error);
g_error_free (error);
}
/**
* g_dbus_method_invocation_return_dbus_error:
* @invocation: (transfer full): A #GDBusMethodInvocation.
* @error_name: A valid D-Bus error name.
* @error_message: A valid D-Bus error message.
*
* Finishes handling a D-Bus method call by returning an error.
*
* This method will free @invocation, you cannot use it afterwards.
*
* Since: 2.26
*/
void
g_dbus_method_invocation_return_dbus_error (GDBusMethodInvocation *invocation,
const gchar *error_name,
const gchar *error_message)
{
GDBusMessage *reply;
g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
g_return_if_fail (error_name != NULL && g_dbus_is_name (error_name));
g_return_if_fail (error_message != NULL);
if (G_UNLIKELY (_g_dbus_debug_return ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Return:\n"
" >>>> METHOD ERROR %s\n"
" message '%s'\n"
" in response to %s.%s()\n"
" on object %s\n"
" to name %s\n"
" reply-serial %d\n",
error_name,
error_message,
invocation->interface_name, invocation->method_name,
invocation->object_path,
invocation->sender,
g_dbus_message_get_serial (invocation->message));
_g_dbus_debug_print_unlock ();
}
reply = g_dbus_message_new_method_error_literal (invocation->message,
error_name,
error_message);
g_dbus_connection_send_message (g_dbus_method_invocation_get_connection (invocation), reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
g_object_unref (invocation);
}
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