257 lines
6.4 KiB
C++
257 lines
6.4 KiB
C++
/*
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* Copyright © 2007 Chris Wilson
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* Copyright © 2009,2010 Red Hat, Inc.
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* 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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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Contributor(s):
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* 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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*/
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#ifndef HB_OBJECT_PRIVATE_HH
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#define HB_OBJECT_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-mutex-private.hh"
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/* Debug */
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#ifndef HB_DEBUG_OBJECT
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#define HB_DEBUG_OBJECT (HB_DEBUG+0)
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#endif
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/* atomic_int */
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/* We need external help for these */
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#ifdef HAVE_GLIB
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#include <glib.h>
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typedef volatile int hb_atomic_int_t;
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#define hb_atomic_int_fetch_and_add(AI, V) g_atomic_int_exchange_and_add (&(AI), V)
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#define hb_atomic_int_get(AI) g_atomic_int_get (&(AI))
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#define hb_atomic_int_set(AI, V) g_atomic_int_set (&(AI), V)
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#elif defined(_MSC_VER)
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#include <intrin.h>
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typedef long hb_atomic_int_t;
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#define hb_atomic_int_fetch_and_add(AI, V) _InterlockedExchangeAdd (&(AI), V)
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#define hb_atomic_int_get(AI) (_ReadBarrier (), (AI))
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#define hb_atomic_int_set(AI, V) ((void) _InterlockedExchange (&(AI), (V)))
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#else
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#warning "Could not find any system to define atomic_int macros, library will NOT be thread-safe"
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typedef volatile int hb_atomic_int_t;
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#define hb_atomic_int_fetch_and_add(AI, V) ((AI) += (V), (AI) - (V))
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#define hb_atomic_int_get(AI) (AI)
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#define hb_atomic_int_set(AI, V) ((void) ((AI) = (V)))
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#endif
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/* reference_count */
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typedef struct {
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hb_atomic_int_t ref_count;
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#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
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#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 */ }
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inline int inc (void) { return hb_atomic_int_fetch_and_add (ref_count, 1); }
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inline int dec (void) { return hb_atomic_int_fetch_and_add (ref_count, -1); }
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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); }
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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 {
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hb_user_data_key_t *key;
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void *data;
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hb_destroy_func_t destroy;
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inline bool operator == (hb_user_data_key_t *other_key) const { return key == other_key; }
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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); }
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};
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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,
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void * data,
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hb_destroy_func_t destroy);
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HB_INTERNAL void *get (hb_user_data_key_t *key);
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HB_INTERNAL void finish (void);
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};
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/* object_header */
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typedef struct _hb_object_header_t hb_object_header_t;
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struct _hb_object_header_t {
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hb_reference_count_t ref_count;
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hb_user_data_array_t user_data;
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#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INVALID}
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static inline void *create (unsigned int size) {
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hb_object_header_t *obj = (hb_object_header_t *) calloc (1, size);
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if (likely (obj))
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obj->init ();
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return obj;
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}
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inline void init (void) {
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ref_count.init (1);
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}
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inline bool is_inert (void) const {
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return unlikely (ref_count.is_invalid ());
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}
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inline void reference (void) {
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if (unlikely (!this || this->is_inert ()))
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return;
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ref_count.inc ();
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}
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inline bool destroy (void) {
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if (unlikely (!this || this->is_inert ()))
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return false;
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if (ref_count.dec () != 1)
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return false;
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ref_count.init (HB_REFERENCE_COUNT_INVALID_VALUE);
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user_data.finish ();
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return true;
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}
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inline bool set_user_data (hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy_func) {
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if (unlikely (!this || this->is_inert ()))
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return false;
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return user_data.set (key, data, destroy_func);
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}
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inline void *get_user_data (hb_user_data_key_t *key) {
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return user_data.get (key);
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}
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inline void trace (const char *function) const {
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DEBUG_MSG (OBJECT, (void *) this,
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"refcount=%d %s",
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this ? ref_count.get () : 0,
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function);
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}
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};
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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)
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{
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obj->header.trace (function);
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}
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template <typename Type>
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static inline Type *hb_object_create (void)
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{
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Type *obj = (Type *) hb_object_header_t::create (sizeof (Type));
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hb_object_trace (obj, HB_FUNC);
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return obj;
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}
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template <typename Type>
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static inline bool hb_object_is_inert (const Type *obj)
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{
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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)
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{
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hb_object_trace (obj, HB_FUNC);
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obj->header.reference ();
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return obj;
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}
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template <typename Type>
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static inline bool hb_object_destroy (Type *obj)
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{
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hb_object_trace (obj, HB_FUNC);
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return obj->header.destroy ();
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}
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template <typename Type>
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static inline bool hb_object_set_user_data (Type *obj,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy)
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{
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return obj->header.set_user_data (key, data, destroy);
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}
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template <typename Type>
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static inline void *hb_object_get_user_data (Type *obj,
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hb_user_data_key_t *key)
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{
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return obj->header.get_user_data (key);
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}
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#endif /* HB_OBJECT_PRIVATE_HH */
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