harfbuzz/src/hb-object-private.hh

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/*
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* Copyright (C) 2007 Chris Wilson
* Copyright (C) 2009,2010 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
* 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>
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* Red Hat Author(s): Behdad Esfahbod
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*/
#ifndef HB_OBJECT_PRIVATE_HH
#define HB_OBJECT_PRIVATE_HH
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#include "hb-private.hh"
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HB_BEGIN_DECLS
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/* Encapsulate operations on the object's reference count */
typedef struct {
hb_atomic_int_t ref_count;
} hb_reference_count_t;
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#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)
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#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
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#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))
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#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)
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/* Debug */
#ifndef HB_DEBUG_OBJECT
#define HB_DEBUG_OBJECT (HB_DEBUG+0)
#endif
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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));
}
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#define TRACE_OBJECT(obj) _hb_trace_object (obj, &obj->ref_count, __FUNCTION__)
/* Object allocation and lifecycle manamgement macros */
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#define HB_OBJECT_IS_INERT(obj) \
(unlikely (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
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#define HB_OBJECT_DO_INIT_EXPR(obj) \
HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
#define HB_OBJECT_DO_INIT(obj) \
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HB_STMT_START { \
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HB_OBJECT_DO_INIT_EXPR (obj); \
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} HB_STMT_END
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#define HB_OBJECT_DO_CREATE(Type, obj) \
likely (( \
(void) ( \
((obj) = (Type *) calloc (1, sizeof (Type))) && \
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( \
HB_OBJECT_DO_INIT_EXPR (obj), \
TRACE_OBJECT (obj), \
TRUE \
) \
), \
(obj) \
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))
#define HB_OBJECT_DO_REFERENCE(obj) \
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HB_STMT_START { \
int old_count; \
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
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return obj; \
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TRACE_OBJECT (obj); \
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old_count = hb_reference_count_inc (obj->ref_count); \
assert (old_count > 0); \
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return obj; \
} HB_STMT_END
#define HB_OBJECT_DO_DESTROY(obj) \
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HB_STMT_START { \
int old_count; \
if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
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return; \
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TRACE_OBJECT (obj); \
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old_count = hb_reference_count_dec (obj->ref_count); \
assert (old_count > 0); \
if (old_count != 1) \
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return; \
} HB_STMT_END
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HB_END_DECLS
#endif /* HB_OBJECT_PRIVATE_HH */