harfbuzz/src/hb-object-private.hh

131 lines
3.5 KiB
C++
Raw Normal View History

2009-07-30 21:33:57 +02:00
/*
2010-11-18 19:58:32 +01:00
* Copyright (C) 2007 Chris Wilson
* Copyright (C) 2009,2010 Red Hat, Inc.
2009-07-30 21:33:57 +02:00
*
2010-04-22 06:11:43 +02:00
* This is part of HarfBuzz, a text shaping library.
2009-07-30 21:33:57 +02:00
*
* 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>
2009-08-02 01:30:31 +02:00
* Red Hat Author(s): Behdad Esfahbod
2009-07-30 21:33:57 +02:00
*/
#ifndef HB_OBJECT_PRIVATE_HH
#define HB_OBJECT_PRIVATE_HH
2009-07-30 21:33:57 +02:00
#include "hb-private.hh"
2010-07-23 21:11:18 +02:00
HB_BEGIN_DECLS
2009-11-06 01:37:58 +01:00
2009-07-30 21:33:57 +02:00
typedef struct {
hb_atomic_int_t ref_count;
2011-04-21 22:16:21 +02:00
#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
inline void init (int v) { ref_count = v; /* non-atomic is fine */ }
inline int inc (void) { return hb_atomic_int_fetch_and_add (ref_count, 1); }
inline int dec (void) { return hb_atomic_int_fetch_and_add (ref_count, -1); }
inline void set (int v) { return hb_atomic_int_set (ref_count, v); }
2011-04-21 22:16:21 +02:00
inline int get (void) const { return hb_atomic_int_get (ref_count); }
inline bool is_invalid (void) const { return get () == HB_REFERENCE_COUNT_INVALID_VALUE; }
2009-07-30 21:33:57 +02:00
} hb_reference_count_t;
2009-07-30 21:33:57 +02:00
2009-08-02 01:30:31 +02:00
/* Debug */
#ifndef HB_DEBUG_OBJECT
#define HB_DEBUG_OBJECT (HB_DEBUG+0)
#endif
2010-05-24 19:01:09 +02:00
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,
ref_count->get (),
function));
}
2010-05-24 19:01:09 +02:00
#define TRACE_OBJECT(obj) _hb_trace_object (obj, &obj->ref_count, __FUNCTION__)
/* Object allocation and lifecycle manamgement macros */
2009-08-02 01:30:31 +02:00
#define HB_OBJECT_IS_INERT(obj) \
2011-04-21 22:16:21 +02:00
(unlikely ((obj)->ref_count.is_invalid ()))
2009-08-02 02:29:22 +02:00
#define HB_OBJECT_DO_INIT_EXPR(obj) \
obj->ref_count.init (1)
2009-08-02 02:29:22 +02:00
#define HB_OBJECT_DO_INIT(obj) \
2009-08-02 01:30:31 +02:00
HB_STMT_START { \
2009-08-02 02:29:22 +02:00
HB_OBJECT_DO_INIT_EXPR (obj); \
2009-08-02 01:30:31 +02:00
} HB_STMT_END
2009-08-04 04:43:02 +02:00
#define HB_OBJECT_DO_CREATE(Type, obj) \
likely (( \
(void) ( \
((obj) = (Type *) calloc (1, sizeof (Type))) && \
2010-05-24 19:01:09 +02:00
( \
HB_OBJECT_DO_INIT_EXPR (obj), \
TRACE_OBJECT (obj), \
TRUE \
) \
), \
(obj) \
2009-08-02 02:29:22 +02:00
))
#define HB_OBJECT_DO_REFERENCE(obj) \
2009-08-02 01:30:31 +02:00
HB_STMT_START { \
int old_count; \
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
2009-08-02 01:30:31 +02:00
return obj; \
2010-05-24 19:01:09 +02:00
TRACE_OBJECT (obj); \
old_count = obj->ref_count.inc (); \
assert (old_count > 0); \
2009-08-02 01:30:31 +02:00
return obj; \
} HB_STMT_END
#define HB_OBJECT_DO_DESTROY(obj) \
2009-08-02 01:30:31 +02:00
HB_STMT_START { \
int old_count; \
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
2009-08-02 01:30:31 +02:00
return; \
2010-05-24 19:01:09 +02:00
TRACE_OBJECT (obj); \
old_count = obj->ref_count.dec (); \
assert (old_count > 0); \
if (old_count != 1) \
2009-08-02 01:30:31 +02:00
return; \
} HB_STMT_END
2010-07-23 21:11:18 +02:00
HB_END_DECLS
#endif /* HB_OBJECT_PRIVATE_HH */