142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/*
|
|
* Copyright (C) 2007 Chris Wilson
|
|
* Copyright (C) 2009,2010 Red Hat, Inc.
|
|
*
|
|
* This is part of HarfBuzz, a text shaping library.
|
|
*
|
|
* Permission is hereby granted, without written agreement and without
|
|
* license or royalty fees, to use, copy, modify, and distribute this
|
|
* software and its documentation for any purpose, provided that the
|
|
* above copyright notice and the following two paragraphs appear in
|
|
* all copies of this software.
|
|
*
|
|
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
|
|
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
|
|
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
|
|
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
|
* DAMAGE.
|
|
*
|
|
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
|
|
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
|
|
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*
|
|
* Contributor(s):
|
|
* Chris Wilson <chris@chris-wilson.co.uk>
|
|
* Red Hat Author(s): Behdad Esfahbod
|
|
*/
|
|
|
|
#ifndef HB_OBJECT_PRIVATE_H
|
|
#define HB_OBJECT_PRIVATE_H
|
|
|
|
#include "hb-private.h"
|
|
|
|
HB_BEGIN_DECLS
|
|
|
|
|
|
/* Encapsulate operations on the object's reference count */
|
|
typedef struct {
|
|
hb_atomic_int_t ref_count;
|
|
} hb_reference_count_t;
|
|
|
|
#define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
|
|
#define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, -1)
|
|
|
|
#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
|
|
|
|
#define HB_REFERENCE_COUNT_GET_VALUE(RC) hb_atomic_int_get ((RC).ref_count)
|
|
#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
|
|
|
|
#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
|
|
#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
|
|
|
|
#define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
|
|
|
|
#define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
|
|
|
|
|
|
|
|
/* Debug */
|
|
|
|
#ifndef HB_DEBUG_OBJECT
|
|
#define HB_DEBUG_OBJECT (HB_DEBUG+0)
|
|
#endif
|
|
|
|
static inline void
|
|
_hb_trace_object (const void *obj,
|
|
hb_reference_count_t *ref_count,
|
|
const char *function)
|
|
{
|
|
(void) (HB_DEBUG_OBJECT &&
|
|
fprintf (stderr, "OBJECT(%p) refcount=%d %s\n",
|
|
obj,
|
|
HB_REFERENCE_COUNT_GET_VALUE (*ref_count),
|
|
function));
|
|
}
|
|
|
|
#define TRACE_OBJECT(obj) _hb_trace_object (obj, &obj->ref_count, __FUNCTION__)
|
|
|
|
|
|
|
|
/* Object allocation and lifecycle manamgement macros */
|
|
|
|
#define HB_OBJECT_IS_INERT(obj) \
|
|
(unlikely (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
|
|
|
|
#define HB_OBJECT_DO_INIT_EXPR(obj) \
|
|
HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
|
|
|
|
#define HB_OBJECT_DO_INIT(obj) \
|
|
HB_STMT_START { \
|
|
HB_OBJECT_DO_INIT_EXPR (obj); \
|
|
} HB_STMT_END
|
|
|
|
#define HB_OBJECT_DO_CREATE(Type, obj) \
|
|
likely (( \
|
|
(void) ( \
|
|
((obj) = (Type *) calloc (1, sizeof (Type))) && \
|
|
( \
|
|
HB_OBJECT_DO_INIT_EXPR (obj), \
|
|
TRACE_OBJECT (obj), \
|
|
TRUE \
|
|
) \
|
|
), \
|
|
(obj) \
|
|
))
|
|
|
|
#define HB_OBJECT_DO_REFERENCE(obj) \
|
|
HB_STMT_START { \
|
|
int old_count; \
|
|
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
|
|
return obj; \
|
|
TRACE_OBJECT (obj); \
|
|
old_count = hb_reference_count_inc (obj->ref_count); \
|
|
assert (old_count > 0); \
|
|
return obj; \
|
|
} HB_STMT_END
|
|
|
|
#define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
|
|
HB_STMT_START { \
|
|
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
|
|
return 0; \
|
|
return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
|
|
} HB_STMT_END
|
|
|
|
#define HB_OBJECT_DO_DESTROY(obj) \
|
|
HB_STMT_START { \
|
|
int old_count; \
|
|
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
|
|
return; \
|
|
TRACE_OBJECT (obj); \
|
|
old_count = hb_reference_count_dec (obj->ref_count); \
|
|
assert (old_count > 0); \
|
|
if (old_count != 1) \
|
|
return; \
|
|
} HB_STMT_END
|
|
|
|
|
|
HB_END_DECLS
|
|
|
|
#endif /* HB_OBJECT_PRIVATE_H */
|