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3f56b84e75
It was always passed the same value by all users of the macro. This introduces no functional changes. Signed-off-by: Philip Withnall <pwithnall@gnome.org>
1764 lines
55 KiB
C
1764 lines
55 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2000-2001 Red Hat, Inc.
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* Copyright (C) 2005 Imendio AB
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* MT safe with regards to reference counting.
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*/
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#include "config.h"
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#include "../glib/gvalgrind.h"
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#include <string.h>
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#include <ffi.h>
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#include "gclosure.h"
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#include "gboxed.h"
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#include "gobject.h"
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#include "genums.h"
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#include "gvalue.h"
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#include "gvaluetypes.h"
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#include "gtype-private.h"
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/**
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* GClosure:
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* @in_marshal: Indicates whether the closure is currently being invoked with
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* g_closure_invoke()
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* @is_invalid: Indicates whether the closure has been invalidated by
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* g_closure_invalidate()
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*
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* A `GClosure` represents a callback supplied by the programmer.
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*
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* It will generally comprise a function of some kind and a marshaller
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* used to call it. It is the responsibility of the marshaller to
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* convert the arguments for the invocation from #GValues into
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* a suitable form, perform the callback on the converted arguments,
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* and transform the return value back into a #GValue.
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*
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* In the case of C programs, a closure usually just holds a pointer
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* to a function and maybe a data argument, and the marshaller
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* converts between #GValue and native C types. The GObject
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* library provides the #GCClosure type for this purpose. Bindings for
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* other languages need marshallers which convert between #GValues
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* and suitable representations in the runtime of the language in
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* order to use functions written in that language as callbacks. Use
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* g_closure_set_marshal() to set the marshaller on such a custom
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* closure implementation.
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*
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* Within GObject, closures play an important role in the
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* implementation of signals. When a signal is registered, the
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* @c_marshaller argument to g_signal_new() specifies the default C
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* marshaller for any closure which is connected to this
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* signal. GObject provides a number of C marshallers for this
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* purpose, see the g_cclosure_marshal_*() functions. Additional C
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* marshallers can be generated with the [glib-genmarshal][glib-genmarshal]
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* utility. Closures can be explicitly connected to signals with
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* g_signal_connect_closure(), but it usually more convenient to let
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* GObject create a closure automatically by using one of the
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* g_signal_connect_*() functions which take a callback function/user
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* data pair.
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*
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* Using closures has a number of important advantages over a simple
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* callback function/data pointer combination:
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*
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* - Closures allow the callee to get the types of the callback parameters,
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* which means that language bindings don't have to write individual glue
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* for each callback type.
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*
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* - The reference counting of #GClosure makes it easy to handle reentrancy
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* right; if a callback is removed while it is being invoked, the closure
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* and its parameters won't be freed until the invocation finishes.
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*
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* - g_closure_invalidate() and invalidation notifiers allow callbacks to be
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* automatically removed when the objects they point to go away.
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*/
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#define CLOSURE_MAX_REF_COUNT ((1 << 15) - 1)
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#define CLOSURE_MAX_N_GUARDS ((1 << 1) - 1)
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#define CLOSURE_MAX_N_FNOTIFIERS ((1 << 2) - 1)
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#define CLOSURE_MAX_N_INOTIFIERS ((1 << 8) - 1)
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#define CLOSURE_N_MFUNCS(cl) (((cl)->n_guards << 1L))
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/* same as G_CLOSURE_N_NOTIFIERS() (keep in sync) */
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#define CLOSURE_N_NOTIFIERS(cl) (CLOSURE_N_MFUNCS (cl) + \
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(cl)->n_fnotifiers + \
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(cl)->n_inotifiers)
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/* A copy of the flags bitfield from the beginning of `struct _GClosure`, which
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* is in union with an int for atomic access to all fields at the same time.
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*
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* This must be kept in sync with `struct _GClosure`, but that’s easy because
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* it’s (unfortunately) a public struct, so can never change for ABI
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* compatibility reasons. */
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typedef union {
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struct {
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guint ref_count : 15; /* (atomic) */
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/* meta_marshal is not used anymore but must be zero for historical reasons
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as it was exposed in the G_CLOSURE_N_NOTIFIERS macro */
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guint meta_marshal_nouse : 1; /* (atomic) */
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guint n_guards : 1; /* (atomic) */
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guint n_fnotifiers : 2; /* finalization notifiers (atomic) */
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guint n_inotifiers : 8; /* invalidation notifiers (atomic) */
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guint in_inotify : 1; /* (atomic) */
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guint floating : 1; /* (atomic) */
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guint derivative_flag : 1; /* (atomic) */
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guint in_marshal : 1; /* (atomic) */
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guint is_invalid : 1; /* (atomic) */
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} flags;
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GClosure closure;
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int atomic_int;
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} GClosureFlags;
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G_STATIC_ASSERT (sizeof (GClosureFlags) == sizeof (GClosure));
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G_STATIC_ASSERT (G_ALIGNOF (GClosureFlags) == G_ALIGNOF (GClosure));
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#define ATOMIC_CHANGE_FIELD(_closure, _field, _OP, _value, _SET_OLD, _SET_NEW) \
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G_STMT_START { \
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GClosureFlags *cunion = (GClosureFlags *) _closure; \
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gint new_int, old_int, success; \
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old_int = g_atomic_int_get (&cunion->atomic_int); \
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do \
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{ \
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GClosureFlags tmp; \
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tmp.atomic_int = old_int; \
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_SET_OLD tmp.flags._field; \
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tmp.flags._field _OP _value; \
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_SET_NEW tmp.flags._field; \
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new_int = tmp.atomic_int; \
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success = g_atomic_int_compare_and_exchange_full (&cunion->atomic_int, old_int, new_int, \
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&old_int); \
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} \
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while (!success); \
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} G_STMT_END
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#define ATOMIC_SWAP(_closure, _field, _value, _oldv) ATOMIC_CHANGE_FIELD (_closure, _field, =, _value, *(_oldv) =, (void) )
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#define ATOMIC_SET(_closure, _field, _value) ATOMIC_CHANGE_FIELD (_closure, _field, =, _value, (void), (void) )
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#define ATOMIC_INC(_closure, _field) ATOMIC_CHANGE_FIELD (_closure, _field, +=, 1, (void), (void) )
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#define ATOMIC_INC_ASSIGN(_closure, _field, _newv) ATOMIC_CHANGE_FIELD (_closure, _field, +=, 1, (void), *(_newv) = )
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#define ATOMIC_DEC(_closure, _field) ATOMIC_CHANGE_FIELD (_closure, _field, -=, 1, (void), (void) )
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#define ATOMIC_DEC_ASSIGN(_closure, _field, _newv) ATOMIC_CHANGE_FIELD (_closure, _field, -=, 1, (void), *(_newv) = )
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static inline GClosureFlags
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closure_atomic_get_flags (GClosure *closure)
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{
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GClosureFlags tmp;
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tmp.atomic_int = g_atomic_int_get (&((GClosureFlags *) closure)->atomic_int);
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return tmp;
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}
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enum {
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FNOTIFY,
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INOTIFY,
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PRE_NOTIFY,
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POST_NOTIFY
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};
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/* --- functions --- */
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/**
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* g_closure_new_simple:
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* @sizeof_closure: the size of the structure to allocate, must be at least
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* `sizeof (GClosure)`
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* @data: data to store in the @data field of the newly allocated #GClosure
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*
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* Allocates a struct of the given size and initializes the initial
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* part as a #GClosure.
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*
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* This function is mainly useful when implementing new types of closures:
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*
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* |[<!-- language="C" -->
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* typedef struct _MyClosure MyClosure;
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* struct _MyClosure
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* {
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* GClosure closure;
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* // extra data goes here
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* };
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*
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* static void
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* my_closure_finalize (gpointer notify_data,
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* GClosure *closure)
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* {
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* MyClosure *my_closure = (MyClosure *)closure;
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*
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* // free extra data here
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* }
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*
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* MyClosure *my_closure_new (gpointer data)
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* {
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* GClosure *closure;
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* MyClosure *my_closure;
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*
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* closure = g_closure_new_simple (sizeof (MyClosure), data);
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* my_closure = (MyClosure *) closure;
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*
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* // initialize extra data here
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*
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* g_closure_add_finalize_notifier (closure, notify_data,
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* my_closure_finalize);
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* return my_closure;
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* }
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* ]|
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*
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* Returns: (transfer floating): a floating reference to a new #GClosure
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*/
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GClosure*
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g_closure_new_simple (guint sizeof_closure,
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gpointer data)
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{
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GClosure *closure;
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gint private_size;
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gchar *allocated;
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g_return_val_if_fail (sizeof_closure >= sizeof (GClosure), NULL);
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private_size = sizeof (GRealClosure) - sizeof (GClosure);
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#ifdef ENABLE_VALGRIND
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/* See comments in gtype.c about what's going on here... */
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if (RUNNING_ON_VALGRIND)
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{
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private_size += sizeof (gpointer);
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allocated = g_malloc0 (private_size + sizeof_closure + sizeof (gpointer));
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*(gpointer *) (allocated + private_size + sizeof_closure) = allocated + sizeof (gpointer);
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VALGRIND_MALLOCLIKE_BLOCK (allocated + private_size, sizeof_closure + sizeof (gpointer), 0, TRUE);
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VALGRIND_MALLOCLIKE_BLOCK (allocated + sizeof (gpointer), private_size - sizeof (gpointer), 0, TRUE);
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}
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else
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#endif
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allocated = g_malloc0 (private_size + sizeof_closure);
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closure = (GClosure *) (allocated + private_size);
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ATOMIC_SET (closure, ref_count, 1);
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ATOMIC_SET (closure, floating, TRUE);
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closure->data = data;
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return closure;
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}
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static inline void
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closure_invoke_notifiers (GClosure *closure,
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guint notify_type)
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{
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/* notifier layout:
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* n_guards n_guards n_fnotif. n_inotifiers
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* ->[[pre_guards][post_guards][fnotifiers][inotifiers]]
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*
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* CLOSURE_N_MFUNCS(cl) = n_guards + n_guards;
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* CLOSURE_N_NOTIFIERS(cl) = CLOSURE_N_MFUNCS(cl) + n_fnotifiers + n_inotifiers
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*
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* constrains/catches:
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* - closure->notifiers may be reloacted during callback
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* - closure->n_fnotifiers and closure->n_inotifiers may change during callback
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* - i.e. callbacks can be removed/added during invocation
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* - must prepare for callback removal during FNOTIFY and INOTIFY (done via ->marshal= & ->data=)
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* - must distinguish (->marshal= & ->data=) for INOTIFY vs. FNOTIFY (via ->in_inotify)
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* + closure->n_guards is const during PRE_NOTIFY & POST_NOTIFY
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* + none of the callbacks can cause recursion
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* + closure->n_inotifiers is const 0 during FNOTIFY
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*/
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switch (notify_type)
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{
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GClosureNotifyData *ndata;
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guint i, offs;
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case FNOTIFY:
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while (closure->n_fnotifiers)
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{
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guint n;
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ATOMIC_DEC_ASSIGN (closure, n_fnotifiers, &n);
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ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + n;
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closure->marshal = (GClosureMarshal) ndata->notify;
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closure->data = ndata->data;
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ndata->notify (ndata->data, closure);
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}
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closure->marshal = NULL;
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closure->data = NULL;
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break;
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case INOTIFY:
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ATOMIC_SET (closure, in_inotify, TRUE);
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while (closure->n_inotifiers)
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{
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guint n;
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ATOMIC_DEC_ASSIGN (closure, n_inotifiers, &n);
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ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + n;
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closure->marshal = (GClosureMarshal) ndata->notify;
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closure->data = ndata->data;
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ndata->notify (ndata->data, closure);
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}
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closure->marshal = NULL;
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closure->data = NULL;
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ATOMIC_SET (closure, in_inotify, FALSE);
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break;
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case PRE_NOTIFY:
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i = closure->n_guards;
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offs = 0;
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while (i--)
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{
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ndata = closure->notifiers + offs + i;
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ndata->notify (ndata->data, closure);
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}
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break;
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case POST_NOTIFY:
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i = closure->n_guards;
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offs = i;
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while (i--)
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{
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ndata = closure->notifiers + offs + i;
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ndata->notify (ndata->data, closure);
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}
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break;
|
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}
|
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}
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|
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static void
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g_closure_set_meta_va_marshal (GClosure *closure,
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GVaClosureMarshal va_meta_marshal)
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{
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GClosureFlags old_flags;
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GRealClosure *real_closure;
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g_return_if_fail (closure != NULL);
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g_return_if_fail (va_meta_marshal != NULL);
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old_flags = closure_atomic_get_flags (closure);
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g_return_if_fail (!old_flags.flags.is_invalid);
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g_return_if_fail (!old_flags.flags.in_marshal);
|
||
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real_closure = G_REAL_CLOSURE (closure);
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g_return_if_fail (real_closure->meta_marshal != NULL);
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real_closure->va_meta_marshal = va_meta_marshal;
|
||
}
|
||
|
||
/**
|
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* g_closure_set_meta_marshal: (skip)
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* @closure: a #GClosure
|
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* @marshal_data: (closure meta_marshal): context-dependent data to pass
|
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* to @meta_marshal
|
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* @meta_marshal: a #GClosureMarshal function
|
||
*
|
||
* Sets the meta marshaller of @closure.
|
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*
|
||
* A meta marshaller wraps the @closure's marshal and modifies the way
|
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* 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 the @closure's 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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
GRealClosure *real_closure;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
g_return_if_fail (meta_marshal != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
g_return_if_fail (!old_flags.flags.is_invalid);
|
||
g_return_if_fail (!old_flags.flags.in_marshal);
|
||
|
||
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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
guint i;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
g_return_if_fail (pre_marshal_notify != NULL);
|
||
g_return_if_fail (post_marshal_notify != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
g_return_if_fail (!old_flags.flags.is_invalid);
|
||
g_return_if_fail (!old_flags.flags.in_marshal);
|
||
g_return_if_fail (old_flags.flags.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;
|
||
ATOMIC_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;
|
||
ATOMIC_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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
guint i;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
g_return_if_fail (notify_func != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
g_return_if_fail (!old_flags.flags.is_invalid);
|
||
g_return_if_fail (old_flags.flags.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;
|
||
ATOMIC_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)
|
||
{
|
||
ATOMIC_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)
|
||
{
|
||
ATOMIC_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;
|
||
}
|
||
|
||
static GClosureFlags
|
||
closure_ref_internal (GClosure *closure)
|
||
{
|
||
guint new_ref_count;
|
||
int old_int, success;
|
||
GClosureFlags tmp = { .atomic_int = 0, };
|
||
|
||
old_int = g_atomic_int_get (&((GClosureFlags *) closure)->atomic_int);
|
||
do
|
||
{
|
||
tmp.atomic_int = old_int;
|
||
tmp.flags.ref_count += 1;
|
||
success = g_atomic_int_compare_and_exchange_full (&((GClosureFlags *) closure)->atomic_int, old_int, tmp.atomic_int, &old_int);
|
||
}
|
||
while (!success);
|
||
|
||
new_ref_count = tmp.flags.ref_count;
|
||
|
||
g_return_val_if_fail (new_ref_count > 1, tmp);
|
||
g_return_val_if_fail (new_ref_count < CLOSURE_MAX_REF_COUNT + 1, tmp);
|
||
|
||
return tmp;
|
||
}
|
||
|
||
/**
|
||
* 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)
|
||
{
|
||
g_return_val_if_fail (closure != NULL, NULL);
|
||
|
||
closure_ref_internal (closure);
|
||
return closure;
|
||
}
|
||
|
||
static void
|
||
closure_invalidate_internal (GClosure *closure)
|
||
{
|
||
gboolean was_invalid;
|
||
|
||
ATOMIC_SWAP (closure, is_invalid, TRUE, &was_invalid);
|
||
/* invalidate only once */
|
||
if (!was_invalid)
|
||
closure_invoke_notifiers (closure, INOTIFY);
|
||
}
|
||
|
||
/**
|
||
* 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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
if (!old_flags.flags.is_invalid)
|
||
{
|
||
g_closure_ref (closure); /* preserve floating flag */
|
||
closure_invalidate_internal (closure);
|
||
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;
|
||
GClosureFlags old_flags;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
g_return_if_fail (old_flags.flags.ref_count > 0);
|
||
|
||
/* last unref, invalidate first */
|
||
if (old_flags.flags.ref_count == 1 && !old_flags.flags.is_invalid)
|
||
closure_invalidate_internal (closure);
|
||
|
||
ATOMIC_DEC_ASSIGN (closure, ref_count, &new_ref_count);
|
||
|
||
if (new_ref_count == 0)
|
||
{
|
||
closure_invoke_notifiers (closure, FNOTIFY);
|
||
g_free (closure->notifiers);
|
||
|
||
#ifdef ENABLE_VALGRIND
|
||
/* 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
|
||
#endif
|
||
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.
|
||
*
|
||
* This function 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(). An 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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
g_return_if_fail (old_flags.flags.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 initial ref_count.
|
||
*/
|
||
if (old_flags.flags.floating)
|
||
{
|
||
gboolean was_floating;
|
||
ATOMIC_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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
g_return_if_fail (notify_func != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
|
||
if (old_flags.flags.is_invalid && old_flags.flags.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_critical (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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
g_return_if_fail (notify_func != NULL);
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
|
||
if (old_flags.flags.is_invalid && !old_flags.flags.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_critical (G_STRLOC ": unable to remove uninstalled finalization notifier: %p (%p)",
|
||
notify_func, notify_data);
|
||
}
|
||
|
||
/**
|
||
* g_closure_invoke:
|
||
* @closure: a #GClosure
|
||
* @return_value: (optional) (out): 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: (nullable): 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)
|
||
{
|
||
GClosureFlags reffed_flags;
|
||
GRealClosure *real_closure;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
|
||
real_closure = G_REAL_CLOSURE (closure);
|
||
|
||
reffed_flags = closure_ref_internal (closure); /* preserve floating flag */
|
||
if (!reffed_flags.flags.is_invalid)
|
||
{
|
||
GClosureMarshal marshal;
|
||
gpointer marshal_data;
|
||
gboolean in_marshal = reffed_flags.flags.in_marshal;
|
||
|
||
g_return_if_fail (closure->marshal || real_closure->meta_marshal);
|
||
|
||
ATOMIC_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);
|
||
ATOMIC_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)
|
||
{
|
||
GClosureFlags reffed_flags;
|
||
GRealClosure *real_closure;
|
||
|
||
g_return_if_fail (closure != NULL);
|
||
|
||
real_closure = G_REAL_CLOSURE (closure);
|
||
|
||
reffed_flags = closure_ref_internal (closure); /* preserve floating flag */
|
||
if (!reffed_flags.flags.is_invalid)
|
||
{
|
||
GVaClosureMarshal marshal;
|
||
gpointer marshal_data;
|
||
gboolean in_marshal = reffed_flags.flags.in_marshal;
|
||
|
||
g_return_if_fail (closure->marshal || real_closure->meta_marshal);
|
||
|
||
ATOMIC_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);
|
||
ATOMIC_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.
|
||
*
|
||
* For GObject's C predefined marshallers (the `g_cclosure_marshal_*()`
|
||
* functions), what it provides is a callback function to use instead of
|
||
* @closure->callback.
|
||
*
|
||
* See also: g_closure_set_meta_marshal()
|
||
*/
|
||
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_critical ("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_critical ("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.
|
||
*
|
||
* @destroy_data will be called as a finalize notifier on the #GClosure.
|
||
*
|
||
* Returns: (transfer floating): a floating reference to 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.
|
||
*
|
||
* @destroy_data will be called as a finalize notifier on the #GClosure.
|
||
*
|
||
* Returns: (transfer floating): a floating reference to 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;
|
||
ATOMIC_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)
|
||
{
|
||
GClosureFlags old_flags;
|
||
GRealClosure *real_closure;
|
||
GTypeClass *class;
|
||
gpointer callback;
|
||
GType itype;
|
||
guint offset;
|
||
|
||
old_flags = closure_atomic_get_flags (closure);
|
||
|
||
if (old_flags.flags.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: (transfer floating): a floating reference to 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), GTYPE_TO_POINTER (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_critical ("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;
|
||
GType type;
|
||
|
||
type = G_VALUE_TYPE (gvalue);
|
||
|
||
restart:
|
||
switch (g_type_fundamental (type))
|
||
{
|
||
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;
|
||
case G_TYPE_INTERFACE:
|
||
type = g_type_interface_instantiatable_prerequisite (type);
|
||
if (type)
|
||
goto restart;
|
||
G_GNUC_FALLTHROUGH;
|
||
default:
|
||
g_critical ("value_from_ffi_type: Unsupported fundamental type %s for type %s",
|
||
g_type_name (g_type_fundamental (G_VALUE_TYPE (gvalue))),
|
||
g_type_name (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_critical ("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: (nullable): 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: (nullable): 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;
|
||
}
|
||
|
||
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);
|
||
}
|