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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.lsearch (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 items.in_error () ? nullptr : item;
+ }
+
+ template <typename T>
+ void remove (T v, lock_t &l)
+ {
+ l.lock ();
+ item_t *item = items.lsearch (v);
+ if (item)
+ {
+ item_t old = *item;
+ *item = std::move (items.tail ());
+ 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.lsearch (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.tail ();
+ items.pop ();
+ l.unlock ();
+ old.fini ();
+ l.lock ();
+ }
+ items.fini ();
+ l.unlock ();
+ }
+
+};
+
+
+/*
+ * Reference-count.
+ */
+
+struct hb_reference_count_t
+{
+ mutable hb_atomic_int_t ref_count;
+
+ void init (int v = 1) { ref_count = v; }
+ int get_relaxed () const { return ref_count; }
+ int inc () const { return ref_count.inc (); }
+ int dec () const { return ref_count.dec (); }
+ void fini () { ref_count = -0x0000DEAD; }
+
+ bool is_inert () const { return !ref_count; }
+ bool is_valid () const { return ref_count > 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 (); }
+
+ void fini () { items.fini (lock); lock.fini (); }
+
+ bool set (hb_user_data_key_t *key,
+ void * data,
+ hb_destroy_func_t destroy,
+ hb_bool_t replace)
+ {
+ if (!key)
+ return false;
+
+ if (replace) {
+ if (!data && !destroy) {
+ items.remove (key, lock);
+ return true;
+ }
+ }
+ hb_user_data_item_t item = {key, data, destroy};
+ bool ret = !!items.replace_or_insert (item, lock, (bool) replace);
+
+ return ret;
+ }
+
+ void *get (hb_user_data_key_t *key)
+ {
+ hb_user_data_item_t item = {nullptr, nullptr, nullptr};
+
+ return items.find (key, &item, lock) ? item.data : nullptr;
+ }
+};
+
+
+/*
+ * Object header
+ */
+
+struct hb_object_header_t
+{
+ hb_reference_count_t ref_count;
+ mutable hb_atomic_int_t writable = 0;
+ hb_atomic_ptr_t<hb_user_data_array_t> user_data;
+
+ bool is_inert () const { return !ref_count.get_relaxed (); }
+};
+#define HB_OBJECT_HEADER_STATIC {}
+
+
+/*
+ * 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, typename ...Ts>
+static inline Type *hb_object_create (Ts... ds)
+{
+ Type *obj = (Type *) hb_calloc (1, sizeof (Type));
+
+ if (unlikely (!obj))
+ return obj;
+
+ new (obj) Type (std::forward<Ts> (ds)...);
+
+ 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 = true;
+ obj->header.user_data.init ();
+}
+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;
+}
+template <typename Type>
+static inline void hb_object_make_immutable (const Type *obj)
+{
+ obj->header.writable = false;
+}
+template <typename Type>
+static inline Type *hb_object_reference (Type *obj)
+{
+ hb_object_trace (obj, HB_FUNC);
+ if (unlikely (!obj || obj->header.is_inert ()))
+ 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 || obj->header.is_inert ()))
+ return false;
+ assert (hb_object_is_valid (obj));
+ if (obj->header.ref_count.dec () != 1)
+ return false;
+
+ hb_object_fini (obj);
+
+ if (!std::is_trivially_destructible<Type>::value)
+ obj->~Type ();
+
+ 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_acquire ();
+ if (user_data)
+ {
+ user_data->fini ();
+ hb_free (user_data);
+ obj->header.user_data.set_relaxed (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 || obj->header.is_inert ()))
+ return false;
+ assert (hb_object_is_valid (obj));
+
+retry:
+ hb_user_data_array_t *user_data = obj->header.user_data.get_acquire ();
+ if (unlikely (!user_data))
+ {
+ user_data = (hb_user_data_array_t *) hb_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 ();
+ hb_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 || obj->header.is_inert ()))
+ return nullptr;
+ assert (hb_object_is_valid (obj));
+ hb_user_data_array_t *user_data = obj->header.user_data.get_acquire ();
+ if (!user_data)
+ return nullptr;
+ return user_data->get (key);
+}
+
+
+#endif /* HB_OBJECT_HH */
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