harfbuzz/src/hb-object-private.hh

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/*
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* Copyright © 2007 Chris Wilson
* Copyright © 2009,2010 Red Hat, Inc.
* Copyright © 2011 Google, 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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* Google 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"
#include "hb-mutex-private.hh"
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HB_BEGIN_DECLS
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/* Debug */
#ifndef HB_DEBUG_OBJECT
#define HB_DEBUG_OBJECT (HB_DEBUG+0)
#endif
/* atomic_int */
/* We need external help for these */
#ifdef HAVE_GLIB
#include <glib.h>
typedef volatile int hb_atomic_int_t;
#define hb_atomic_int_fetch_and_add(AI, V) g_atomic_int_exchange_and_add (&(AI), V)
#define hb_atomic_int_get(AI) g_atomic_int_get (&(AI))
#define hb_atomic_int_set(AI, V) g_atomic_int_set (&(AI), V)
#elif defined(_MSC_VER)
#include <intrin.h>
typedef long hb_atomic_int_t;
#define hb_atomic_int_fetch_and_add(AI, V) _InterlockedExchangeAdd (&(AI), V)
#define hb_atomic_int_get(AI) (_ReadBarrier (), (AI))
#define hb_atomic_int_set(AI, V) ((void) _InterlockedExchange (&(AI), (V)))
#else
#warning "Could not find any system to define atomic_int macros, library will NOT be thread-safe"
typedef volatile int hb_atomic_int_t;
#define hb_atomic_int_fetch_and_add(AI, V) ((AI) += (V), (AI) - (V))
#define hb_atomic_int_get(AI) (AI)
#define hb_atomic_int_set(AI, V) ((void) ((AI) = (V)))
#endif
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/* reference_count */
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typedef struct {
hb_atomic_int_t ref_count;
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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}
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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) { hb_atomic_int_set (ref_count, v); }
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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; }
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} hb_reference_count_t;
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/* user_data */
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struct hb_user_data_array_t {
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struct hb_user_data_item_t {
hb_user_data_key_t *key;
void *data;
hb_destroy_func_t destroy;
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inline bool operator == (hb_user_data_key_t *other_key) const { return key == other_key; }
inline bool operator == (hb_user_data_item_t &other) const { return key == other.key; }
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void finish (void) { if (destroy) destroy (data); }
};
hb_lockable_set_t<hb_user_data_item_t, hb_static_mutex_t> items;
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HB_INTERNAL bool set (hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy);
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HB_INTERNAL void *get (hb_user_data_key_t *key);
HB_INTERNAL void finish (void);
};
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/* object_header */
typedef struct _hb_object_header_t hb_object_header_t;
struct _hb_object_header_t {
hb_reference_count_t ref_count;
hb_user_data_array_t user_data;
#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INVALID}
static inline void *create (unsigned int size) {
hb_object_header_t *obj = (hb_object_header_t *) calloc (1, size);
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if (likely (obj))
obj->init ();
return obj;
}
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inline void init (void) {
ref_count.init (1);
}
inline bool is_inert (void) const {
return unlikely (ref_count.is_invalid ());
}
inline void reference (void) {
if (unlikely (!this || this->is_inert ()))
return;
ref_count.inc ();
}
inline bool destroy (void) {
if (unlikely (!this || this->is_inert ()))
return false;
if (ref_count.dec () != 1)
return false;
ref_count.init (HB_REFERENCE_COUNT_INVALID_VALUE);
user_data.finish ();
return true;
}
inline bool set_user_data (hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy) {
if (unlikely (!this || this->is_inert ()))
return false;
return user_data.set (key, data, destroy);
}
inline void *get_user_data (hb_user_data_key_t *key) {
return user_data.get (key);
}
inline void trace (const char *function) const {
(void) (HB_DEBUG_OBJECT &&
fprintf (stderr, "OBJECT(%p) refcount=%d %s\n",
this,
this ? ref_count.get () : 0,
function));
}
};
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HB_END_DECLS
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/* object */
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template <typename Type>
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static inline void hb_object_trace (const Type *obj, const char *function)
{
obj->header.trace (function);
}
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template <typename Type>
static inline Type *hb_object_create (void)
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{
Type *obj = (Type *) hb_object_header_t::create (sizeof (Type));
hb_object_trace (obj, HB_FUNC);
return obj;
}
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template <typename Type>
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static inline bool hb_object_is_inert (const Type *obj)
{
return unlikely (obj->header.is_inert ());
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}
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template <typename Type>
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static inline Type *hb_object_reference (Type *obj)
{
hb_object_trace (obj, HB_FUNC);
obj->header.reference ();
return obj;
}
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template <typename Type>
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static inline bool hb_object_destroy (Type *obj)
{
hb_object_trace (obj, HB_FUNC);
return obj->header.destroy ();
}
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template <typename Type>
static inline bool hb_object_set_user_data (Type *obj,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy)
{
return obj->header.set_user_data (key, data, destroy);
}
template <typename Type>
static inline void *hb_object_get_user_data (Type *obj,
hb_user_data_key_t *key)
{
return obj->header.get_user_data (key);
}
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HB_BEGIN_DECLS
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HB_END_DECLS
#endif /* HB_OBJECT_PRIVATE_HH */