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-/*
- * Copyright © 2007 Chris Wilson
- * Copyright © 2009,2010 Red Hat, Inc.
- * Copyright © 2011,2012 Google, 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
- * Google Author(s): Behdad Esfahbod
- */
-
-#ifndef HB_OBJECT_HH
-#define HB_OBJECT_HH
-
-#include "hb.hh"
-#include "hb-atomic.hh"
-#include "hb-mutex.hh"
-#include "hb-vector.hh"
-
-
-/*
- * Lockable set
- */
-
-template <typename item_t, typename lock_t>
-struct hb_lockable_set_t
-{
- hb_vector_t<item_t> items;
-
- void init () { items.init (); }
-
- template <typename T>
- item_t *replace_or_insert (T v, lock_t &l, bool replace)
- {
- l.lock ();
- item_t *item = items.find (v);
- if (item) {
- if (replace) {
- item_t old = *item;
- *item = v;
- l.unlock ();
- old.fini ();
- }
- else {
- item = nullptr;
- l.unlock ();
- }
- } else {
- item = items.push (v);
- l.unlock ();
- }
- return item;
- }
-
- template <typename T>
- void remove (T v, lock_t &l)
- {
- l.lock ();
- item_t *item = items.find (v);
- if (item)
- {
- item_t old = *item;
- *item = items[items.length - 1];
- items.pop ();
- l.unlock ();
- old.fini ();
- } else {
- l.unlock ();
- }
- }
-
- template <typename T>
- bool find (T v, item_t *i, lock_t &l)
- {
- l.lock ();
- item_t *item = items.find (v);
- if (item)
- *i = *item;
- l.unlock ();
- return !!item;
- }
-
- template <typename T>
- item_t *find_or_insert (T v, lock_t &l)
- {
- l.lock ();
- item_t *item = items.find (v);
- if (!item) {
- item = items.push (v);
- }
- l.unlock ();
- return item;
- }
-
- void fini (lock_t &l)
- {
- if (!items.length)
- {
- /* No need to lock. */
- items.fini ();
- return;
- }
- l.lock ();
- while (items.length)
- {
- item_t old = items[items.length - 1];
- items.pop ();
- l.unlock ();
- old.fini ();
- l.lock ();
- }
- items.fini ();
- l.unlock ();
- }
-
-};
-
-
-/*
- * Reference-count.
- */
-
-#define HB_REFERENCE_COUNT_INERT_VALUE 0
-#define HB_REFERENCE_COUNT_POISON_VALUE -0x0000DEAD
-#define HB_REFERENCE_COUNT_INIT {HB_ATOMIC_INT_INIT (HB_REFERENCE_COUNT_INERT_VALUE)}
-
-struct hb_reference_count_t
-{
- mutable hb_atomic_int_t ref_count;
-
- void init (int v = 1) { ref_count.set_relaxed (v); }
- int get_relaxed () const { return ref_count.get_relaxed (); }
- int inc () const { return ref_count.inc (); }
- int dec () const { return ref_count.dec (); }
- void fini () { ref_count.set_relaxed (HB_REFERENCE_COUNT_POISON_VALUE); }
-
- bool is_inert () const { return ref_count.get_relaxed () == HB_REFERENCE_COUNT_INERT_VALUE; }
- bool is_valid () const { return ref_count.get_relaxed () > 0; }
-};
-
-
-/* user_data */
-
-struct hb_user_data_array_t
-{
- struct hb_user_data_item_t {
- hb_user_data_key_t *key;
- void *data;
- hb_destroy_func_t destroy;
-
- bool operator == (const hb_user_data_key_t *other_key) const { return key == other_key; }
- bool operator == (const hb_user_data_item_t &other) const { return key == other.key; }
-
- void fini () { if (destroy) destroy (data); }
- };
-
- hb_mutex_t lock;
- hb_lockable_set_t<hb_user_data_item_t, hb_mutex_t> items;
-
- void init () { lock.init (); items.init (); }
-
- HB_INTERNAL bool set (hb_user_data_key_t *key,
- void * data,
- hb_destroy_func_t destroy,
- hb_bool_t replace);
-
- HB_INTERNAL void *get (hb_user_data_key_t *key);
-
- void fini () { items.fini (lock); lock.fini (); }
-};
-
-
-/*
- * Object header
- */
-
-struct hb_object_header_t
-{
- hb_reference_count_t ref_count;
- mutable hb_atomic_int_t writable;
- hb_atomic_ptr_t<hb_user_data_array_t> user_data;
-};
-#define HB_OBJECT_HEADER_STATIC \
- { \
- HB_REFERENCE_COUNT_INIT, \
- HB_ATOMIC_INT_INIT (false), \
- HB_ATOMIC_PTR_INIT (nullptr) \
- }
-
-
-/*
- * Object
- */
-
-template <typename Type>
-static inline void hb_object_trace (const Type *obj, const char *function)
-{
- DEBUG_MSG (OBJECT, (void *) obj,
- "%s refcount=%d",
- function,
- obj ? obj->header.ref_count.get_relaxed () : 0);
-}
-
-template <typename Type>
-static inline Type *hb_object_create ()
-{
- Type *obj = (Type *) calloc (1, sizeof (Type));
-
- if (unlikely (!obj))
- return obj;
-
- hb_object_init (obj);
- hb_object_trace (obj, HB_FUNC);
- return obj;
-}
-template <typename Type>
-static inline void hb_object_init (Type *obj)
-{
- obj->header.ref_count.init ();
- obj->header.writable.set_relaxed (true);
- obj->header.user_data.init ();
-}
-template <typename Type>
-static inline bool hb_object_is_inert (const Type *obj)
-{
- return unlikely (obj->header.ref_count.is_inert ());
-}
-template <typename Type>
-static inline bool hb_object_is_valid (const Type *obj)
-{
- return likely (obj->header.ref_count.is_valid ());
-}
-template <typename Type>
-static inline bool hb_object_is_immutable (const Type *obj)
-{
- return !obj->header.writable.get_relaxed ();
-}
-template <typename Type>
-static inline void hb_object_make_immutable (const Type *obj)
-{
- obj->header.writable.set_relaxed (false);
-}
-template <typename Type>
-static inline Type *hb_object_reference (Type *obj)
-{
- hb_object_trace (obj, HB_FUNC);
- if (unlikely (!obj || hb_object_is_inert (obj)))
- return obj;
- assert (hb_object_is_valid (obj));
- obj->header.ref_count.inc ();
- return obj;
-}
-template <typename Type>
-static inline bool hb_object_destroy (Type *obj)
-{
- hb_object_trace (obj, HB_FUNC);
- if (unlikely (!obj || hb_object_is_inert (obj)))
- return false;
- assert (hb_object_is_valid (obj));
- if (obj->header.ref_count.dec () != 1)
- return false;
-
- hb_object_fini (obj);
- return true;
-}
-template <typename Type>
-static inline void hb_object_fini (Type *obj)
-{
- obj->header.ref_count.fini (); /* Do this before user_data */
- hb_user_data_array_t *user_data = obj->header.user_data.get ();
- if (user_data)
- {
- user_data->fini ();
- free (user_data);
- user_data = nullptr;
- }
-}
-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,
- hb_bool_t replace)
-{
- if (unlikely (!obj || hb_object_is_inert (obj)))
- return false;
- assert (hb_object_is_valid (obj));
-
-retry:
- hb_user_data_array_t *user_data = obj->header.user_data.get ();
- if (unlikely (!user_data))
- {
- user_data = (hb_user_data_array_t *) calloc (sizeof (hb_user_data_array_t), 1);
- if (unlikely (!user_data))
- return false;
- user_data->init ();
- if (unlikely (!obj->header.user_data.cmpexch (nullptr, user_data)))
- {
- user_data->fini ();
- free (user_data);
- goto retry;
- }
- }
-
- return user_data->set (key, data, destroy, replace);
-}
-
-template <typename Type>
-static inline void *hb_object_get_user_data (Type *obj,
- hb_user_data_key_t *key)
-{
- if (unlikely (!obj || hb_object_is_inert (obj)))
- return nullptr;
- assert (hb_object_is_valid (obj));
- hb_user_data_array_t *user_data = obj->header.user_data.get ();
- if (!user_data)
- return nullptr;
- return user_data->get (key);
-}
-
-
-#endif /* HB_OBJECT_HH */