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glib/gobject/gclosure.c
Philip Withnall 25a7c817d3 glib: Add missing (nullable) and (optional) annotations 
Add various (nullable) and (optional) annotations which were missing
from a variety of functions. Also port a couple of existing (allow-none)
annotations in the same files to use (nullable) and (optional) as
appropriate instead.

Secondly, add various (not nullable) annotations as needed by the new
default in gobject-introspection of marking gpointers as (nullable). See
https://bugzilla.gnome.org/show_bug.cgi?id=729660.

This includes adding some stub documentation comments for the
assertion macro error functions, which weren’t previously documented.
The new comments are purely to allow for annotations, and hence are
marked as (skip) to prevent the symbols appearing in the GIR file.

https://bugzilla.gnome.org/show_bug.cgi?id=719966
2015-11-07 10:48:32 +01:00

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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000-2001 Red Hat, Inc.
* Copyright (C) 2005 Imendio AB
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* MT safe with regards to reference counting.
*/
#include "config.h"
#include "../glib/valgrind.h"
#include <string.h>
#include <ffi.h>
#include "gclosure.h"
#include "gboxed.h"
#include "gobject.h"
#include "genums.h"
#include "gvalue.h"
#include "gvaluetypes.h"
#include "gtype-private.h"
/**
* SECTION:gclosure
* @short_description: Functions as first-class objects
* @title: Closures
*
* A #GClosure represents a callback supplied by the programmer. It
* will generally comprise a function of some kind and a marshaller
* used to call it. It is the responsibility of the marshaller to
* convert the arguments for the invocation from #GValues into
* a suitable form, perform the callback on the converted arguments,
* and transform the return value back into a #GValue.
*
* In the case of C programs, a closure usually just holds a pointer
* to a function and maybe a data argument, and the marshaller
* converts between #GValue and native C types. The GObject
* library provides the #GCClosure type for this purpose. Bindings for
* other languages need marshallers which convert between #GValue<!--
* -->s and suitable representations in the runtime of the language in
* order to use functions written in that languages as callbacks.
*
* Within GObject, closures play an important role in the
* implementation of signals. When a signal is registered, the
* @c_marshaller argument to g_signal_new() specifies the default C
* marshaller for any closure which is connected to this
* signal. GObject provides a number of C marshallers for this
* purpose, see the g_cclosure_marshal_*() functions. Additional C
* marshallers can be generated with the [glib-genmarshal][glib-genmarshal]
* utility. Closures can be explicitly connected to signals with
* g_signal_connect_closure(), but it usually more convenient to let
* GObject create a closure automatically by using one of the
* g_signal_connect_*() functions which take a callback function/user
* data pair.
*
* Using closures has a number of important advantages over a simple
* callback function/data pointer combination:
*
* - Closures allow the callee to get the types of the callback parameters,
* which means that language bindings don't have to write individual glue
* for each callback type.
*
* - The reference counting of #GClosure makes it easy to handle reentrancy
* right; if a callback is removed while it is being invoked, the closure
* and its parameters won't be freed until the invocation finishes.
*
* - g_closure_invalidate() and invalidation notifiers allow callbacks to be
* automatically removed when the objects they point to go away.
*/
#define CLOSURE_MAX_REF_COUNT ((1 << 15) - 1)
#define CLOSURE_MAX_N_GUARDS ((1 << 1) - 1)
#define CLOSURE_MAX_N_FNOTIFIERS ((1 << 2) - 1)
#define CLOSURE_MAX_N_INOTIFIERS ((1 << 8) - 1)
#define CLOSURE_N_MFUNCS(cl) (((cl)->n_guards << 1L))
/* same as G_CLOSURE_N_NOTIFIERS() (keep in sync) */
#define CLOSURE_N_NOTIFIERS(cl) (CLOSURE_N_MFUNCS (cl) + \
(cl)->n_fnotifiers + \
(cl)->n_inotifiers)
typedef union {
GClosure closure;
volatile gint vint;
} ClosureInt;
#define CHANGE_FIELD(_closure, _field, _OP, _value, _must_set, _SET_OLD, _SET_NEW) \
G_STMT_START { \
ClosureInt *cunion = (ClosureInt*) _closure; \
gint new_int, old_int, success; \
do \
{ \
ClosureInt tmp; \
tmp.vint = old_int = cunion->vint; \
_SET_OLD tmp.closure._field; \
tmp.closure._field _OP _value; \
_SET_NEW tmp.closure._field; \
new_int = tmp.vint; \
success = g_atomic_int_compare_and_exchange (&cunion->vint, old_int, new_int); \
} \
while (!success && _must_set); \
} G_STMT_END
#define SWAP(_closure, _field, _value, _oldv) CHANGE_FIELD (_closure, _field, =, _value, TRUE, *(_oldv) =, (void) )
#define SET(_closure, _field, _value) CHANGE_FIELD (_closure, _field, =, _value, TRUE, (void), (void) )
#define INC(_closure, _field) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), (void) )
#define INC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), *(_newv) = )
#define DEC(_closure, _field) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), (void) )
#define DEC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), *(_newv) = )
#if 0 /* for non-thread-safe closures */
#define SWAP(cl,f,v,o) (void) (*(o) = cl->f, cl->f = v)
#define SET(cl,f,v) (void) (cl->f = v)
#define INC(cl,f) (void) (cl->f += 1)
#define INC_ASSIGN(cl,f,n) (void) (cl->f += 1, *(n) = cl->f)
#define DEC(cl,f) (void) (cl->f -= 1)
#define DEC_ASSIGN(cl,f,n) (void) (cl->f -= 1, *(n) = cl->f)
#endif
enum {
FNOTIFY,
INOTIFY,
PRE_NOTIFY,
POST_NOTIFY
};
/* --- functions --- */
/**
* g_closure_new_simple:
* @sizeof_closure: the size of the structure to allocate, must be at least
* `sizeof (GClosure)`
* @data: data to store in the @data field of the newly allocated #GClosure
*
* Allocates a struct of the given size and initializes the initial
* part as a #GClosure. This function is mainly useful when
* implementing new types of closures.
*
* |[<!-- language="C" -->
* typedef struct _MyClosure MyClosure;
* struct _MyClosure
* {
* GClosure closure;
* // extra data goes here
* };
*
* static void
* my_closure_finalize (gpointer notify_data,
* GClosure *closure)
* {
* MyClosure *my_closure = (MyClosure *)closure;
*
* // free extra data here
* }
*
* MyClosure *my_closure_new (gpointer data)
* {
* GClosure *closure;
* MyClosure *my_closure;
*
* closure = g_closure_new_simple (sizeof (MyClosure), data);
* my_closure = (MyClosure *) closure;
*
* // initialize extra data here
*
* g_closure_add_finalize_notifier (closure, notify_data,
* my_closure_finalize);
* return my_closure;
* }
* ]|
*
* Returns: (transfer full): a newly allocated #GClosure
*/
GClosure*
g_closure_new_simple (guint sizeof_closure,
gpointer data)
{
GClosure *closure;
gint private_size;
gchar *allocated;
g_return_val_if_fail (sizeof_closure >= sizeof (GClosure), NULL);
private_size = sizeof (GRealClosure) - sizeof (GClosure);
/* See comments in gtype.c about what's going on here... */
if (RUNNING_ON_VALGRIND)
{
private_size += sizeof (gpointer);
allocated = g_malloc0 (private_size + sizeof_closure + sizeof (gpointer));
*(gpointer *) (allocated + private_size + sizeof_closure) = allocated + sizeof (gpointer);
VALGRIND_MALLOCLIKE_BLOCK (allocated + private_size, sizeof_closure + sizeof (gpointer), 0, TRUE);
VALGRIND_MALLOCLIKE_BLOCK (allocated + sizeof (gpointer), private_size - sizeof (gpointer), 0, TRUE);
}
else
allocated = g_malloc0 (private_size + sizeof_closure);
closure = (GClosure *) (allocated + private_size);
SET (closure, ref_count, 1);
SET (closure, floating, TRUE);
closure->data = data;
return closure;
}
static inline void
closure_invoke_notifiers (GClosure *closure,
guint notify_type)
{
/* notifier layout:
* n_guards n_guards n_fnotif. n_inotifiers
* ->[[pre_guards][post_guards][fnotifiers][inotifiers]]
*
* CLOSURE_N_MFUNCS(cl) = n_guards + n_guards;
* CLOSURE_N_NOTIFIERS(cl) = CLOSURE_N_MFUNCS(cl) + n_fnotifiers + n_inotifiers
*
* constrains/catches:
* - closure->notifiers may be reloacted during callback
* - closure->n_fnotifiers and closure->n_inotifiers may change during callback
* - i.e. callbacks can be removed/added during invocation
* - must prepare for callback removal during FNOTIFY and INOTIFY (done via ->marshal= & ->data=)
* - must distinguish (->marshal= & ->data=) for INOTIFY vs. FNOTIFY (via ->in_inotify)
* + closure->n_guards is const during PRE_NOTIFY & POST_NOTIFY
* + none of the callbacks can cause recursion
* + closure->n_inotifiers is const 0 during FNOTIFY
*/
switch (notify_type)
{
GClosureNotifyData *ndata;
guint i, offs;
case FNOTIFY:
while (closure->n_fnotifiers)
{
guint n;
DEC_ASSIGN (closure, n_fnotifiers, &n);
ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + n;
closure->marshal = (GClosureMarshal) ndata->notify;
closure->data = ndata->data;
ndata->notify (ndata->data, closure);
}
closure->marshal = NULL;
closure->data = NULL;
break;
case INOTIFY:
SET (closure, in_inotify, TRUE);
while (closure->n_inotifiers)
{
guint n;
DEC_ASSIGN (closure, n_inotifiers, &n);
ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + n;
closure->marshal = (GClosureMarshal) ndata->notify;
closure->data = ndata->data;
ndata->notify (ndata->data, closure);
}
closure->marshal = NULL;
closure->data = NULL;
SET (closure, in_inotify, FALSE);
break;
case PRE_NOTIFY:
i = closure->n_guards;
offs = 0;
while (i--)
{
ndata = closure->notifiers + offs + i;
ndata->notify (ndata->data, closure);
}
break;
case POST_NOTIFY:
i = closure->n_guards;
offs = i;
while (i--)
{
ndata = closure->notifiers + offs + i;
ndata->notify (ndata->data, closure);
}
break;
}
}
static void
g_closure_set_meta_va_marshal (GClosure *closure,
GVaClosureMarshal va_meta_marshal)
{
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
g_return_if_fail (va_meta_marshal != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->in_marshal == FALSE);
real_closure = G_REAL_CLOSURE (closure);
g_return_if_fail (real_closure->meta_marshal != NULL);
real_closure->va_meta_marshal = va_meta_marshal;
}
/**
* g_closure_set_meta_marshal: (skip)
* @closure: a #GClosure
* @marshal_data: (closure meta_marshal): context-dependent data to pass
* to @meta_marshal
* @meta_marshal: a #GClosureMarshal function
*
* Sets the meta marshaller of @closure. A meta marshaller wraps
* @closure->marshal and modifies the way it is called in some
* fashion. The most common use of this facility is for C callbacks.
* The same marshallers (generated by [glib-genmarshal][glib-genmarshal]),
* are used everywhere, but the way that we get the callback function
* differs. In most cases we want to use @closure->callback, but in
* other cases we want to use some different technique to retrieve the
* callback function.
*
* For example, class closures for signals (see
* g_signal_type_cclosure_new()) retrieve the callback function from a
* fixed offset in the class structure. The meta marshaller retrieves
* the right callback and passes it to the marshaller as the
* @marshal_data argument.
*/
void
g_closure_set_meta_marshal (GClosure *closure,
gpointer marshal_data,
GClosureMarshal meta_marshal)
{
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
g_return_if_fail (meta_marshal != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->in_marshal == FALSE);
real_closure = G_REAL_CLOSURE (closure);
g_return_if_fail (real_closure->meta_marshal == NULL);
real_closure->meta_marshal = meta_marshal;
real_closure->meta_marshal_data = marshal_data;
}
/**
* g_closure_add_marshal_guards: (skip)
* @closure: a #GClosure
* @pre_marshal_data: (closure pre_marshal_notify): data to pass
* to @pre_marshal_notify
* @pre_marshal_notify: a function to call before the closure callback
* @post_marshal_data: (closure post_marshal_notify): data to pass
* to @post_marshal_notify
* @post_marshal_notify: a function to call after the closure callback
*
* Adds a pair of notifiers which get invoked before and after the
* closure callback, respectively. This is typically used to protect
* the extra arguments for the duration of the callback. See
* g_object_watch_closure() for an example of marshal guards.
*/
void
g_closure_add_marshal_guards (GClosure *closure,
gpointer pre_marshal_data,
GClosureNotify pre_marshal_notify,
gpointer post_marshal_data,
GClosureNotify post_marshal_notify)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (pre_marshal_notify != NULL);
g_return_if_fail (post_marshal_notify != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->in_marshal == FALSE);
g_return_if_fail (closure->n_guards < CLOSURE_MAX_N_GUARDS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 2);
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers + 1)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 0)];
if (closure->n_inotifiers > 1)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 1)];
if (closure->n_fnotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 1)] = closure->notifiers[CLOSURE_N_MFUNCS (closure) + 0];
if (closure->n_fnotifiers > 1)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers)] = closure->notifiers[CLOSURE_N_MFUNCS (closure) + 1];
if (closure->n_guards)
closure->notifiers[(closure->n_guards +
closure->n_guards + 1)] = closure->notifiers[closure->n_guards];
i = closure->n_guards;
closure->notifiers[i].data = pre_marshal_data;
closure->notifiers[i].notify = pre_marshal_notify;
closure->notifiers[i + 1].data = post_marshal_data;
closure->notifiers[i + 1].notify = post_marshal_notify;
INC (closure, n_guards);
}
/**
* g_closure_add_finalize_notifier: (skip)
* @closure: a #GClosure
* @notify_data: (closure notify_func): data to pass to @notify_func
* @notify_func: the callback function to register
*
* Registers a finalization notifier which will be called when the
* reference count of @closure goes down to 0. Multiple finalization
* notifiers on a single closure are invoked in unspecified order. If
* a single call to g_closure_unref() results in the closure being
* both invalidated and finalized, then the invalidate notifiers will
* be run before the finalize notifiers.
*/
void
g_closure_add_finalize_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
g_return_if_fail (closure->n_fnotifiers < CLOSURE_MAX_N_FNOTIFIERS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 1);
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 0)];
i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers;
closure->notifiers[i].data = notify_data;
closure->notifiers[i].notify = notify_func;
INC (closure, n_fnotifiers);
}
/**
* g_closure_add_invalidate_notifier: (skip)
* @closure: a #GClosure
* @notify_data: (closure notify_func): data to pass to @notify_func
* @notify_func: the callback function to register
*
* Registers an invalidation notifier which will be called when the
* @closure is invalidated with g_closure_invalidate(). Invalidation
* notifiers are invoked before finalization notifiers, in an
* unspecified order.
*/
void
g_closure_add_invalidate_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 1);
i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + closure->n_inotifiers;
closure->notifiers[i].data = notify_data;
closure->notifiers[i].notify = notify_func;
INC (closure, n_inotifiers);
}
static inline gboolean
closure_try_remove_inotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
GClosureNotifyData *ndata, *nlast;
nlast = closure->notifiers + CLOSURE_N_NOTIFIERS (closure) - 1;
for (ndata = nlast + 1 - closure->n_inotifiers; ndata <= nlast; ndata++)
if (ndata->notify == notify_func && ndata->data == notify_data)
{
DEC (closure, n_inotifiers);
if (ndata < nlast)
*ndata = *nlast;
return TRUE;
}
return FALSE;
}
static inline gboolean
closure_try_remove_fnotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
GClosureNotifyData *ndata, *nlast;
nlast = closure->notifiers + CLOSURE_N_NOTIFIERS (closure) - closure->n_inotifiers - 1;
for (ndata = nlast + 1 - closure->n_fnotifiers; ndata <= nlast; ndata++)
if (ndata->notify == notify_func && ndata->data == notify_data)
{
DEC (closure, n_fnotifiers);
if (ndata < nlast)
*ndata = *nlast;
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)];
return TRUE;
}
return FALSE;
}
/**
* g_closure_ref:
* @closure: #GClosure to increment the reference count on
*
* Increments the reference count on a closure to force it staying
* alive while the caller holds a pointer to it.
*
* Returns: (transfer none): The @closure passed in, for convenience
*/
GClosure*
g_closure_ref (GClosure *closure)
{
guint new_ref_count;
g_return_val_if_fail (closure != NULL, NULL);
g_return_val_if_fail (closure->ref_count > 0, NULL);
g_return_val_if_fail (closure->ref_count < CLOSURE_MAX_REF_COUNT, NULL);
INC_ASSIGN (closure, ref_count, &new_ref_count);
g_return_val_if_fail (new_ref_count > 1, NULL);
return closure;
}
/**
* g_closure_invalidate:
* @closure: GClosure to invalidate
*
* Sets a flag on the closure to indicate that its calling
* environment has become invalid, and thus causes any future
* invocations of g_closure_invoke() on this @closure to be
* ignored. Also, invalidation notifiers installed on the closure will
* be called at this point. Note that unless you are holding a
* reference to the closure yourself, the invalidation notifiers may
* unref the closure and cause it to be destroyed, so if you need to
* access the closure after calling g_closure_invalidate(), make sure
* that you've previously called g_closure_ref().
*
* Note that g_closure_invalidate() will also be called when the
* reference count of a closure drops to zero (unless it has already
* been invalidated before).
*/
void
g_closure_invalidate (GClosure *closure)
{
g_return_if_fail (closure != NULL);
if (!closure->is_invalid)
{
gboolean was_invalid;
g_closure_ref (closure); /* preserve floating flag */
SWAP (closure, is_invalid, TRUE, &was_invalid);
/* invalidate only once */
if (!was_invalid)
closure_invoke_notifiers (closure, INOTIFY);
g_closure_unref (closure);
}
}
/**
* g_closure_unref:
* @closure: #GClosure to decrement the reference count on
*
* Decrements the reference count of a closure after it was previously
* incremented by the same caller. If no other callers are using the
* closure, then the closure will be destroyed and freed.
*/
void
g_closure_unref (GClosure *closure)
{
guint new_ref_count;
g_return_if_fail (closure != NULL);
g_return_if_fail (closure->ref_count > 0);
if (closure->ref_count == 1) /* last unref, invalidate first */
g_closure_invalidate (closure);
DEC_ASSIGN (closure, ref_count, &new_ref_count);
if (new_ref_count == 0)
{
closure_invoke_notifiers (closure, FNOTIFY);
g_free (closure->notifiers);
/* See comments in gtype.c about what's going on here... */
if (RUNNING_ON_VALGRIND)
{
gchar *allocated;
allocated = (gchar *) G_REAL_CLOSURE (closure);
allocated -= sizeof (gpointer);
g_free (allocated);
VALGRIND_FREELIKE_BLOCK (allocated + sizeof (gpointer), 0);
VALGRIND_FREELIKE_BLOCK (closure, 0);
}
else
g_free (G_REAL_CLOSURE (closure));
}
}
/**
* g_closure_sink:
* @closure: #GClosure to decrement the initial reference count on, if it's
* still being held
*
* Takes over the initial ownership of a closure. Each closure is
* initially created in a "floating" state, which means that the initial
* reference count is not owned by any caller. g_closure_sink() checks
* to see if the object is still floating, and if so, unsets the
* floating state and decreases the reference count. If the closure
* is not floating, g_closure_sink() does nothing. The reason for the
* existence of the floating state is to prevent cumbersome code
* sequences like:
* |[<!-- language="C" -->
* closure = g_cclosure_new (cb_func, cb_data);
* g_source_set_closure (source, closure);
* g_closure_unref (closure); // GObject doesn't really need this
* ]|
* Because g_source_set_closure() (and similar functions) take ownership of the
* initial reference count, if it is unowned, we instead can write:
* |[<!-- language="C" -->
* g_source_set_closure (source, g_cclosure_new (cb_func, cb_data));
* ]|
*
* Generally, this function is used together with g_closure_ref(). Ane example
* of storing a closure for later notification looks like:
* |[<!-- language="C" -->
* static GClosure *notify_closure = NULL;
* void
* foo_notify_set_closure (GClosure *closure)
* {
* if (notify_closure)
* g_closure_unref (notify_closure);
* notify_closure = closure;
* if (notify_closure)
* {
* g_closure_ref (notify_closure);
* g_closure_sink (notify_closure);
* }
* }
* ]|
*
* Because g_closure_sink() may decrement the reference count of a closure
* (if it hasn't been called on @closure yet) just like g_closure_unref(),
* g_closure_ref() should be called prior to this function.
*/
void
g_closure_sink (GClosure *closure)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (closure->ref_count > 0);
/* floating is basically a kludge to avoid creating closures
* with a ref_count of 0. so the initial ref_count a closure has
* is unowned. with invoking g_closure_sink() code may
* indicate that it takes over that intiial ref_count.
*/
if (closure->floating)
{
gboolean was_floating;
SWAP (closure, floating, FALSE, &was_floating);
/* unref floating flag only once */
if (was_floating)
g_closure_unref (closure);
}
}
/**
* g_closure_remove_invalidate_notifier: (skip)
* @closure: a #GClosure
* @notify_data: data which was passed to g_closure_add_invalidate_notifier()
* when registering @notify_func
* @notify_func: the callback function to remove
*
* Removes an invalidation notifier.
*
* Notice that notifiers are automatically removed after they are run.
*/
void
g_closure_remove_invalidate_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
if (closure->is_invalid && closure->in_inotify && /* account removal of notify_func() while it's called */
((gpointer) closure->marshal) == ((gpointer) notify_func) &&
closure->data == notify_data)
closure->marshal = NULL;
else if (!closure_try_remove_inotify (closure, notify_data, notify_func))
g_warning (G_STRLOC ": unable to remove uninstalled invalidation notifier: %p (%p)",
notify_func, notify_data);
}
/**
* g_closure_remove_finalize_notifier: (skip)
* @closure: a #GClosure
* @notify_data: data which was passed to g_closure_add_finalize_notifier()
* when registering @notify_func
* @notify_func: the callback function to remove
*
* Removes a finalization notifier.
*
* Notice that notifiers are automatically removed after they are run.
*/
void
g_closure_remove_finalize_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
if (closure->is_invalid && !closure->in_inotify && /* account removal of notify_func() while it's called */
((gpointer) closure->marshal) == ((gpointer) notify_func) &&
closure->data == notify_data)
closure->marshal = NULL;
else if (!closure_try_remove_fnotify (closure, notify_data, notify_func))
g_warning (G_STRLOC ": unable to remove uninstalled finalization notifier: %p (%p)",
notify_func, notify_data);
}
/**
* g_closure_invoke:
* @closure: a #GClosure
* @return_value: (allow-none): a #GValue to store the return
* value. May be %NULL if the callback of @closure
* doesn't return a value.
* @n_param_values: the length of the @param_values array
* @param_values: (array length=n_param_values): an array of
* #GValues holding the arguments on which to
* invoke the callback of @closure
* @invocation_hint: (allow-none): a context-dependent invocation hint
*
* Invokes the closure, i.e. executes the callback represented by the @closure.
*/
void
g_closure_invoke (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint)
{
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
real_closure = G_REAL_CLOSURE (closure);
g_closure_ref (closure); /* preserve floating flag */
if (!closure->is_invalid)
{
GClosureMarshal marshal;
gpointer marshal_data;
gboolean in_marshal = closure->in_marshal;
g_return_if_fail (closure->marshal || real_closure->meta_marshal);
SET (closure, in_marshal, TRUE);
if (real_closure->meta_marshal)
{
marshal_data = real_closure->meta_marshal_data;
marshal = real_closure->meta_marshal;
}
else
{
marshal_data = NULL;
marshal = closure->marshal;
}
if (!in_marshal)
closure_invoke_notifiers (closure, PRE_NOTIFY);
marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
marshal_data);
if (!in_marshal)
closure_invoke_notifiers (closure, POST_NOTIFY);
SET (closure, in_marshal, in_marshal);
}
g_closure_unref (closure);
}
gboolean
_g_closure_supports_invoke_va (GClosure *closure)
{
GRealClosure *real_closure;
g_return_val_if_fail (closure != NULL, FALSE);
real_closure = G_REAL_CLOSURE (closure);
return
real_closure->va_marshal != NULL &&
(real_closure->meta_marshal == NULL ||
real_closure->va_meta_marshal != NULL);
}
void
_g_closure_invoke_va (GClosure *closure,
GValue /*out*/ *return_value,
gpointer instance,
va_list args,
int n_params,
GType *param_types)
{
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
real_closure = G_REAL_CLOSURE (closure);
g_closure_ref (closure); /* preserve floating flag */
if (!closure->is_invalid)
{
GVaClosureMarshal marshal;
gpointer marshal_data;
gboolean in_marshal = closure->in_marshal;
g_return_if_fail (closure->marshal || real_closure->meta_marshal);
SET (closure, in_marshal, TRUE);
if (real_closure->va_meta_marshal)
{
marshal_data = real_closure->meta_marshal_data;
marshal = real_closure->va_meta_marshal;
}
else
{
marshal_data = NULL;
marshal = real_closure->va_marshal;
}
if (!in_marshal)
closure_invoke_notifiers (closure, PRE_NOTIFY);
marshal (closure,
return_value,
instance, args,
marshal_data,
n_params, param_types);
if (!in_marshal)
closure_invoke_notifiers (closure, POST_NOTIFY);
SET (closure, in_marshal, in_marshal);
}
g_closure_unref (closure);
}
/**
* g_closure_set_marshal: (skip)
* @closure: a #GClosure
* @marshal: a #GClosureMarshal function
*
* Sets the marshaller of @closure. The `marshal_data`
* of @marshal provides a way for a meta marshaller to provide additional
* information to the marshaller. (See g_closure_set_meta_marshal().) For
* GObject's C predefined marshallers (the g_cclosure_marshal_*()
* functions), what it provides is a callback function to use instead of
* @closure->callback.
*/
void
g_closure_set_marshal (GClosure *closure,
GClosureMarshal marshal)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (marshal != NULL);
if (closure->marshal && closure->marshal != marshal)
g_warning ("attempt to override closure->marshal (%p) with new marshal (%p)",
closure->marshal, marshal);
else
closure->marshal = marshal;
}
void
_g_closure_set_va_marshal (GClosure *closure,
GVaClosureMarshal marshal)
{
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
g_return_if_fail (marshal != NULL);
real_closure = G_REAL_CLOSURE (closure);
if (real_closure->va_marshal && real_closure->va_marshal != marshal)
g_warning ("attempt to override closure->va_marshal (%p) with new marshal (%p)",
real_closure->va_marshal, marshal);
else
real_closure->va_marshal = marshal;
}
/**
* g_cclosure_new: (skip)
* @callback_func: the function to invoke
* @user_data: (closure callback_func): user data to pass to @callback_func
* @destroy_data: destroy notify to be called when @user_data is no longer used
*
* Creates a new closure which invokes @callback_func with @user_data as
* the last parameter.
*
* Returns: a new #GCClosure
*/
GClosure*
g_cclosure_new (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data)
{
GClosure *closure;
g_return_val_if_fail (callback_func != NULL, NULL);
closure = g_closure_new_simple (sizeof (GCClosure), user_data);
if (destroy_data)
g_closure_add_finalize_notifier (closure, user_data, destroy_data);
((GCClosure*) closure)->callback = (gpointer) callback_func;
return closure;
}
/**
* g_cclosure_new_swap: (skip)
* @callback_func: the function to invoke
* @user_data: (closure callback_func): user data to pass to @callback_func
* @destroy_data: destroy notify to be called when @user_data is no longer used
*
* Creates a new closure which invokes @callback_func with @user_data as
* the first parameter.
*
* Returns: (transfer full): a new #GCClosure
*/
GClosure*
g_cclosure_new_swap (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data)
{
GClosure *closure;
g_return_val_if_fail (callback_func != NULL, NULL);
closure = g_closure_new_simple (sizeof (GCClosure), user_data);
if (destroy_data)
g_closure_add_finalize_notifier (closure, user_data, destroy_data);
((GCClosure*) closure)->callback = (gpointer) callback_func;
SET (closure, derivative_flag, TRUE);
return closure;
}
static void
g_type_class_meta_marshal (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GTypeClass *class;
gpointer callback;
/* GType itype = (GType) closure->data; */
guint offset = GPOINTER_TO_UINT (marshal_data);
class = G_TYPE_INSTANCE_GET_CLASS (g_value_peek_pointer (param_values + 0), itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
closure->marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
callback);
}
static void
g_type_class_meta_marshalv (GClosure *closure,
GValue *return_value,
gpointer instance,
va_list args,
gpointer marshal_data,
int n_params,
GType *param_types)
{
GRealClosure *real_closure;
GTypeClass *class;
gpointer callback;
/* GType itype = (GType) closure->data; */
guint offset = GPOINTER_TO_UINT (marshal_data);
real_closure = G_REAL_CLOSURE (closure);
class = G_TYPE_INSTANCE_GET_CLASS (instance, itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
real_closure->va_marshal (closure,
return_value,
instance, args,
callback,
n_params,
param_types);
}
static void
g_type_iface_meta_marshal (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GTypeClass *class;
gpointer callback;
GType itype = (GType) closure->data;
guint offset = GPOINTER_TO_UINT (marshal_data);
class = G_TYPE_INSTANCE_GET_INTERFACE (g_value_peek_pointer (param_values + 0), itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
closure->marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
callback);
}
gboolean
_g_closure_is_void (GClosure *closure,
gpointer instance)
{
GRealClosure *real_closure;
GTypeClass *class;
gpointer callback;
GType itype;
guint offset;
if (closure->is_invalid)
return TRUE;
real_closure = G_REAL_CLOSURE (closure);
if (real_closure->meta_marshal == g_type_iface_meta_marshal)
{
itype = (GType) closure->data;
offset = GPOINTER_TO_UINT (real_closure->meta_marshal_data);
class = G_TYPE_INSTANCE_GET_INTERFACE (instance, itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
return callback == NULL;
}
else if (real_closure->meta_marshal == g_type_class_meta_marshal)
{
offset = GPOINTER_TO_UINT (real_closure->meta_marshal_data);
class = G_TYPE_INSTANCE_GET_CLASS (instance, itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
return callback == NULL;
}
return FALSE;
}
static void
g_type_iface_meta_marshalv (GClosure *closure,
GValue *return_value,
gpointer instance,
va_list args,
gpointer marshal_data,
int n_params,
GType *param_types)
{
GRealClosure *real_closure;
GTypeClass *class;
gpointer callback;
GType itype = (GType) closure->data;
guint offset = GPOINTER_TO_UINT (marshal_data);
real_closure = G_REAL_CLOSURE (closure);
class = G_TYPE_INSTANCE_GET_INTERFACE (instance, itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
real_closure->va_marshal (closure,
return_value,
instance, args,
callback,
n_params,
param_types);
}
/**
* g_signal_type_cclosure_new:
* @itype: the #GType identifier of an interface or classed type
* @struct_offset: the offset of the member function of @itype's class
* structure which is to be invoked by the new closure
*
* Creates a new closure which invokes the function found at the offset
* @struct_offset in the class structure of the interface or classed type
* identified by @itype.
*
* Returns: a new #GCClosure
*/
GClosure*
g_signal_type_cclosure_new (GType itype,
guint struct_offset)
{
GClosure *closure;
g_return_val_if_fail (G_TYPE_IS_CLASSED (itype) || G_TYPE_IS_INTERFACE (itype), NULL);
g_return_val_if_fail (struct_offset >= sizeof (GTypeClass), NULL);
closure = g_closure_new_simple (sizeof (GClosure), (gpointer) itype);
if (G_TYPE_IS_INTERFACE (itype))
{
g_closure_set_meta_marshal (closure, GUINT_TO_POINTER (struct_offset), g_type_iface_meta_marshal);
g_closure_set_meta_va_marshal (closure, g_type_iface_meta_marshalv);
}
else
{
g_closure_set_meta_marshal (closure, GUINT_TO_POINTER (struct_offset), g_type_class_meta_marshal);
g_closure_set_meta_va_marshal (closure, g_type_class_meta_marshalv);
}
return closure;
}
#include <ffi.h>
static ffi_type *
value_to_ffi_type (const GValue *gvalue,
gpointer *value,
gint *enum_tmpval,
gboolean *tmpval_used)
{
ffi_type *rettype = NULL;
GType type = g_type_fundamental (G_VALUE_TYPE (gvalue));
g_assert (type != G_TYPE_INVALID);
if (enum_tmpval)
{
g_assert (tmpval_used != NULL);
*tmpval_used = FALSE;
}
switch (type)
{
case G_TYPE_BOOLEAN:
case G_TYPE_CHAR:
case G_TYPE_INT:
rettype = &ffi_type_sint;
*value = (gpointer)&(gvalue->data[0].v_int);
break;
case G_TYPE_ENUM:
/* enums are stored in v_long even though they are integers, which makes
* marshalling through libffi somewhat complicated. They need to be
* marshalled as signed ints, but we need to use a temporary int sized
* value to pass to libffi otherwise it'll pull the wrong value on
* BE machines with 32-bit integers when treating v_long as 32-bit int.
*/
g_assert (enum_tmpval != NULL);
rettype = &ffi_type_sint;
*enum_tmpval = g_value_get_enum (gvalue);
*value = enum_tmpval;
*tmpval_used = TRUE;
break;
case G_TYPE_FLAGS:
g_assert (enum_tmpval != NULL);
rettype = &ffi_type_uint;
*enum_tmpval = g_value_get_flags (gvalue);
*value = enum_tmpval;
*tmpval_used = TRUE;
break;
case G_TYPE_UCHAR:
case G_TYPE_UINT:
rettype = &ffi_type_uint;
*value = (gpointer)&(gvalue->data[0].v_uint);
break;
case G_TYPE_STRING:
case G_TYPE_OBJECT:
case G_TYPE_BOXED:
case G_TYPE_PARAM:
case G_TYPE_POINTER:
case G_TYPE_INTERFACE:
case G_TYPE_VARIANT:
rettype = &ffi_type_pointer;
*value = (gpointer)&(gvalue->data[0].v_pointer);
break;
case G_TYPE_FLOAT:
rettype = &ffi_type_float;
*value = (gpointer)&(gvalue->data[0].v_float);
break;
case G_TYPE_DOUBLE:
rettype = &ffi_type_double;
*value = (gpointer)&(gvalue->data[0].v_double);
break;
case G_TYPE_LONG:
rettype = &ffi_type_slong;
*value = (gpointer)&(gvalue->data[0].v_long);
break;
case G_TYPE_ULONG:
rettype = &ffi_type_ulong;
*value = (gpointer)&(gvalue->data[0].v_ulong);
break;
case G_TYPE_INT64:
rettype = &ffi_type_sint64;
*value = (gpointer)&(gvalue->data[0].v_int64);
break;
case G_TYPE_UINT64:
rettype = &ffi_type_uint64;
*value = (gpointer)&(gvalue->data[0].v_uint64);
break;
default:
rettype = &ffi_type_pointer;
*value = NULL;
g_warning ("value_to_ffi_type: Unsupported fundamental type: %s", g_type_name (type));
break;
}
return rettype;
}
static void
value_from_ffi_type (GValue *gvalue, gpointer *value)
{
ffi_arg *int_val = (ffi_arg*) value;
switch (g_type_fundamental (G_VALUE_TYPE (gvalue)))
{
case G_TYPE_INT:
g_value_set_int (gvalue, (gint) *int_val);
break;
case G_TYPE_FLOAT:
g_value_set_float (gvalue, *(gfloat*)value);
break;
case G_TYPE_DOUBLE:
g_value_set_double (gvalue, *(gdouble*)value);
break;
case G_TYPE_BOOLEAN:
g_value_set_boolean (gvalue, (gboolean) *int_val);
break;
case G_TYPE_STRING:
g_value_take_string (gvalue, *(gchar**)value);
break;
case G_TYPE_CHAR:
g_value_set_schar (gvalue, (gint8) *int_val);
break;
case G_TYPE_UCHAR:
g_value_set_uchar (gvalue, (guchar) *int_val);
break;
case G_TYPE_UINT:
g_value_set_uint (gvalue, (guint) *int_val);
break;
case G_TYPE_POINTER:
g_value_set_pointer (gvalue, *(gpointer*)value);
break;
case G_TYPE_LONG:
g_value_set_long (gvalue, (glong) *int_val);
break;
case G_TYPE_ULONG:
g_value_set_ulong (gvalue, (gulong) *int_val);
break;
case G_TYPE_INT64:
g_value_set_int64 (gvalue, (gint64) *int_val);
break;
case G_TYPE_UINT64:
g_value_set_uint64 (gvalue, (guint64) *int_val);
break;
case G_TYPE_BOXED:
g_value_take_boxed (gvalue, *(gpointer*)value);
break;
case G_TYPE_ENUM:
g_value_set_enum (gvalue, (gint) *int_val);
break;
case G_TYPE_FLAGS:
g_value_set_flags (gvalue, (guint) *int_val);
break;
case G_TYPE_PARAM:
g_value_take_param (gvalue, *(gpointer*)value);
break;
case G_TYPE_OBJECT:
g_value_take_object (gvalue, *(gpointer*)value);
break;
case G_TYPE_VARIANT:
g_value_take_variant (gvalue, *(gpointer*)value);
break;
default:
g_warning ("value_from_ffi_type: Unsupported fundamental type: %s",
g_type_name (g_type_fundamental (G_VALUE_TYPE (gvalue))));
}
}
typedef union {
gpointer _gpointer;
float _float;
double _double;
gint _gint;
guint _guint;
glong _glong;
gulong _gulong;
gint64 _gint64;
guint64 _guint64;
} va_arg_storage;
static ffi_type *
va_to_ffi_type (GType gtype,
va_list *va,
va_arg_storage *storage)
{
ffi_type *rettype = NULL;
GType type = g_type_fundamental (gtype);
g_assert (type != G_TYPE_INVALID);
switch (type)
{
case G_TYPE_BOOLEAN:
case G_TYPE_CHAR:
case G_TYPE_INT:
case G_TYPE_ENUM:
rettype = &ffi_type_sint;
storage->_gint = va_arg (*va, gint);
break;
case G_TYPE_UCHAR:
case G_TYPE_UINT:
case G_TYPE_FLAGS:
rettype = &ffi_type_uint;
storage->_guint = va_arg (*va, guint);
break;
case G_TYPE_STRING:
case G_TYPE_OBJECT:
case G_TYPE_BOXED:
case G_TYPE_PARAM:
case G_TYPE_POINTER:
case G_TYPE_INTERFACE:
case G_TYPE_VARIANT:
rettype = &ffi_type_pointer;
storage->_gpointer = va_arg (*va, gpointer);
break;
case G_TYPE_FLOAT:
/* Float args are passed as doubles in varargs */
rettype = &ffi_type_float;
storage->_float = (float)va_arg (*va, double);
break;
case G_TYPE_DOUBLE:
rettype = &ffi_type_double;
storage->_double = va_arg (*va, double);
break;
case G_TYPE_LONG:
rettype = &ffi_type_slong;
storage->_glong = va_arg (*va, glong);
break;
case G_TYPE_ULONG:
rettype = &ffi_type_ulong;
storage->_gulong = va_arg (*va, gulong);
break;
case G_TYPE_INT64:
rettype = &ffi_type_sint64;
storage->_gint64 = va_arg (*va, gint64);
break;
case G_TYPE_UINT64:
rettype = &ffi_type_uint64;
storage->_guint64 = va_arg (*va, guint64);
break;
default:
rettype = &ffi_type_pointer;
storage->_guint64 = 0;
g_warning ("va_to_ffi_type: Unsupported fundamental type: %s", g_type_name (type));
break;
}
return rettype;
}
/**
* g_cclosure_marshal_generic:
* @closure: A #GClosure.
* @return_gvalue: A #GValue to store the return value. May be %NULL
* if the callback of closure doesn't return a value.
* @n_param_values: The length of the @param_values array.
* @param_values: An array of #GValues holding the arguments
* on which to invoke the callback of closure.
* @invocation_hint: The invocation hint given as the last argument to
* g_closure_invoke().
* @marshal_data: Additional data specified when registering the
* marshaller, see g_closure_set_marshal() and
* g_closure_set_meta_marshal()
*
* A generic marshaller function implemented via
* [libffi](http://sourceware.org/libffi/).
*
* Normally this function is not passed explicitly to g_signal_new(),
* but used automatically by GLib when specifying a %NULL marshaller.
*
* Since: 2.30
*/
void
g_cclosure_marshal_generic (GClosure *closure,
GValue *return_gvalue,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
ffi_type *rtype;
void *rvalue;
int n_args;
ffi_type **atypes;
void **args;
int i;
ffi_cif cif;
GCClosure *cc = (GCClosure*) closure;
gint *enum_tmpval;
gboolean tmpval_used = FALSE;
enum_tmpval = g_alloca (sizeof (gint));
if (return_gvalue && G_VALUE_TYPE (return_gvalue))
{
rtype = value_to_ffi_type (return_gvalue, &rvalue, enum_tmpval, &tmpval_used);
}
else
{
rtype = &ffi_type_void;
}
rvalue = g_alloca (MAX (rtype->size, sizeof (ffi_arg)));
n_args = n_param_values + 1;
atypes = g_alloca (sizeof (ffi_type *) * n_args);
args = g_alloca (sizeof (gpointer) * n_args);
if (tmpval_used)
enum_tmpval = g_alloca (sizeof (gint));
if (G_CCLOSURE_SWAP_DATA (closure))
{
atypes[n_args-1] = value_to_ffi_type (param_values + 0,
&args[n_args-1],
enum_tmpval,
&tmpval_used);
atypes[0] = &ffi_type_pointer;
args[0] = &closure->data;
}
else
{
atypes[0] = value_to_ffi_type (param_values + 0,
&args[0],
enum_tmpval,
&tmpval_used);
atypes[n_args-1] = &ffi_type_pointer;
args[n_args-1] = &closure->data;
}
for (i = 1; i < n_args - 1; i++)
{
if (tmpval_used)
enum_tmpval = g_alloca (sizeof (gint));
atypes[i] = value_to_ffi_type (param_values + i,
&args[i],
enum_tmpval,
&tmpval_used);
}
if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, n_args, rtype, atypes) != FFI_OK)
return;
ffi_call (&cif, marshal_data ? marshal_data : cc->callback, rvalue, args);
if (return_gvalue && G_VALUE_TYPE (return_gvalue))
value_from_ffi_type (return_gvalue, rvalue);
}
/**
* g_cclosure_marshal_generic_va:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: (allow-none): a #GValue to store the return
* value. May be %NULL if the callback of @closure doesn't return a
* value.
* @instance: (type GObject.TypeInstance): the instance on which the closure is
* invoked.
* @args_list: va_list of arguments to be passed to the closure.
* @marshal_data: (allow-none): additional data specified when
* registering the marshaller, see g_closure_set_marshal() and
* g_closure_set_meta_marshal()
* @n_params: the length of the @param_types array
* @param_types: (array length=n_params): the #GType of each argument from
* @args_list.
*
* A generic #GVaClosureMarshal function implemented via
* [libffi](http://sourceware.org/libffi/).
*
* Since: 2.30
*/
void
g_cclosure_marshal_generic_va (GClosure *closure,
GValue *return_value,
gpointer instance,
va_list args_list,
gpointer marshal_data,
int n_params,
GType *param_types)
{
ffi_type *rtype;
void *rvalue;
int n_args;
ffi_type **atypes;
void **args;
va_arg_storage *storage;
int i;
ffi_cif cif;
GCClosure *cc = (GCClosure*) closure;
gint *enum_tmpval;
gboolean tmpval_used = FALSE;
va_list args_copy;
enum_tmpval = g_alloca (sizeof (gint));
if (return_value && G_VALUE_TYPE (return_value))
{
rtype = value_to_ffi_type (return_value, &rvalue, enum_tmpval, &tmpval_used);
}
else
{
rtype = &ffi_type_void;
}
rvalue = g_alloca (MAX (rtype->size, sizeof (ffi_arg)));
n_args = n_params + 2;
atypes = g_alloca (sizeof (ffi_type *) * n_args);
args = g_alloca (sizeof (gpointer) * n_args);
storage = g_alloca (sizeof (va_arg_storage) * n_params);
if (G_CCLOSURE_SWAP_DATA (closure))
{
atypes[n_args-1] = &ffi_type_pointer;
args[n_args-1] = &instance;
atypes[0] = &ffi_type_pointer;
args[0] = &closure->data;
}
else
{
atypes[0] = &ffi_type_pointer;
args[0] = &instance;
atypes[n_args-1] = &ffi_type_pointer;
args[n_args-1] = &closure->data;
}
G_VA_COPY (args_copy, args_list);
/* Box non-primitive arguments */
for (i = 0; i < n_params; i++)
{
GType type = param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE;
GType fundamental = G_TYPE_FUNDAMENTAL (type);
atypes[i+1] = va_to_ffi_type (type,
&args_copy,
&storage[i]);
args[i+1] = &storage[i];
if ((param_types[i] & G_SIGNAL_TYPE_STATIC_SCOPE) == 0)
{
if (fundamental == G_TYPE_STRING && storage[i]._gpointer != NULL)
storage[i]._gpointer = g_strdup (storage[i]._gpointer);
else if (fundamental == G_TYPE_PARAM && storage[i]._gpointer != NULL)
storage[i]._gpointer = g_param_spec_ref (storage[i]._gpointer);
else if (fundamental == G_TYPE_BOXED && storage[i]._gpointer != NULL)
storage[i]._gpointer = g_boxed_copy (type, storage[i]._gpointer);
else if (fundamental == G_TYPE_VARIANT && storage[i]._gpointer != NULL)
storage[i]._gpointer = g_variant_ref_sink (storage[i]._gpointer);
}
if (fundamental == G_TYPE_OBJECT && storage[i]._gpointer != NULL)
storage[i]._gpointer = g_object_ref (storage[i]._gpointer);
}
va_end (args_copy);
if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, n_args, rtype, atypes) != FFI_OK)
return;
ffi_call (&cif, marshal_data ? marshal_data : cc->callback, rvalue, args);
/* Unbox non-primitive arguments */
for (i = 0; i < n_params; i++)
{
GType type = param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE;
GType fundamental = G_TYPE_FUNDAMENTAL (type);
if ((param_types[i] & G_SIGNAL_TYPE_STATIC_SCOPE) == 0)
{
if (fundamental == G_TYPE_STRING && storage[i]._gpointer != NULL)
g_free (storage[i]._gpointer);
else if (fundamental == G_TYPE_PARAM && storage[i]._gpointer != NULL)
g_param_spec_unref (storage[i]._gpointer);
else if (fundamental == G_TYPE_BOXED && storage[i]._gpointer != NULL)
g_boxed_free (type, storage[i]._gpointer);
else if (fundamental == G_TYPE_VARIANT && storage[i]._gpointer != NULL)
g_variant_unref (storage[i]._gpointer);
}
if (fundamental == G_TYPE_OBJECT && storage[i]._gpointer != NULL)
g_object_unref (storage[i]._gpointer);
}
if (return_value && G_VALUE_TYPE (return_value))
value_from_ffi_type (return_value, rvalue);
}
/**
* g_cclosure_marshal_VOID__VOID:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 1
* @param_values: a #GValue array holding only the instance
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__BOOLEAN:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gboolean parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gboolean arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__CHAR:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gchar parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gchar arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__UCHAR:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #guchar parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, guchar arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__INT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gint parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gint arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__UINT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #guint parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, guint arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__LONG:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #glong parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, glong arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__ULONG:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gulong parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gulong arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__ENUM:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the enumeration parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter denotes an enumeration type..
*/
/**
* g_cclosure_marshal_VOID__FLAGS:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the flags parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter denotes a flags type.
*/
/**
* g_cclosure_marshal_VOID__FLOAT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gfloat parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gfloat arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__DOUBLE:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gdouble parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gdouble arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__STRING:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gchar* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, const gchar *arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__PARAM:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GParamSpec* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, GParamSpec *arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__BOXED:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GBoxed* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, GBoxed *arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gpointer parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, gpointer arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__OBJECT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GObject* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, GObject *arg1, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_VOID__VARIANT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GVariant* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, GVariant *arg1, gpointer user_data)`.
*
* Since: 2.26
*/
/**
* g_cclosure_marshal_VOID__UINT_POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 3
* @param_values: a #GValue array holding instance, arg1 and arg2
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `void (*callback) (gpointer instance, guint arg1, gpointer arg2, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_BOOLEAN__FLAGS:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: a #GValue which can store the returned #gboolean
* @n_param_values: 2
* @param_values: a #GValue array holding instance and arg1
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `gboolean (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter
* denotes a flags type.
*/
/**
* g_cclosure_marshal_BOOL__FLAGS:
*
* Another name for g_cclosure_marshal_BOOLEAN__FLAGS().
*/
/**
* g_cclosure_marshal_STRING__OBJECT_POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: a #GValue, which can store the returned string
* @n_param_values: 3
* @param_values: a #GValue array holding instance, arg1 and arg2
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `gchar* (*callback) (gpointer instance, GObject *arg1, gpointer arg2, gpointer user_data)`.
*/
/**
* g_cclosure_marshal_BOOLEAN__OBJECT_BOXED_BOXED:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: a #GValue, which can store the returned string
* @n_param_values: 3
* @param_values: a #GValue array holding instance, arg1 and arg2
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* `gboolean (*callback) (gpointer instance, GBoxed *arg1, GBoxed *arg2, gpointer user_data)`.
*
* Since: 2.26
*/
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