2 * Copyright © 2007 Chris Wilson
3 * Copyright © 2009,2010 Red Hat, Inc.
4 * Copyright © 2011,2012 Google, Inc.
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
27 * Chris Wilson <chris@chris-wilson.co.uk>
28 * Red Hat Author(s): Behdad Esfahbod
29 * Google Author(s): Behdad Esfahbod
32 #ifndef HB_OBJECT_PRIVATE_HH
33 #define HB_OBJECT_PRIVATE_HH
35 #include "hb-private.hh"
36 #include "hb-debug.hh"
38 #include "hb-atomic-private.hh"
39 #include "hb-mutex-private.hh"
44 #define HB_REFERENCE_COUNT_INERT_VALUE 0
45 #define HB_REFERENCE_COUNT_POISON_VALUE -0x0000DEAD
46 #define HB_REFERENCE_COUNT_INIT {HB_ATOMIC_INT_INIT (HB_REFERENCE_COUNT_INERT_VALUE)}
48 struct hb_reference_count_t
50 hb_atomic_int_t ref_count;
52 inline void init (int v) { ref_count.set_unsafe (v); }
53 inline int get_unsafe (void) const { return ref_count.get_unsafe (); }
54 inline int inc (void) { return ref_count.inc (); }
55 inline int dec (void) { return ref_count.dec (); }
56 inline void fini (void) { ref_count.set_unsafe (HB_REFERENCE_COUNT_POISON_VALUE); }
58 inline bool is_inert (void) const { return ref_count.get_unsafe () == HB_REFERENCE_COUNT_INERT_VALUE; }
59 inline bool is_valid (void) const { return ref_count.get_unsafe () > 0; }
65 struct hb_user_data_array_t
67 struct hb_user_data_item_t {
68 hb_user_data_key_t *key;
70 hb_destroy_func_t destroy;
72 inline bool operator == (hb_user_data_key_t *other_key) const { return key == other_key; }
73 inline bool operator == (hb_user_data_item_t &other) const { return key == other.key; }
75 void fini (void) { if (destroy) destroy (data); }
79 hb_lockable_set_t<hb_user_data_item_t, hb_mutex_t> items;
81 inline void init (void) { lock.init (); items.init (); }
83 HB_INTERNAL bool set (hb_user_data_key_t *key,
85 hb_destroy_func_t destroy,
88 HB_INTERNAL void *get (hb_user_data_key_t *key);
90 inline void fini (void) { items.fini (lock); lock.fini (); }
96 struct hb_object_header_t
98 hb_reference_count_t ref_count;
99 hb_user_data_array_t *user_data;
101 #define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, nullptr}
110 template <typename Type>
111 static inline void hb_object_trace (const Type *obj, const char *function)
113 DEBUG_MSG (OBJECT, (void *) obj,
116 obj ? obj->header.ref_count.get_unsafe () : 0);
119 template <typename Type>
120 static inline Type *hb_object_create (void)
122 Type *obj = (Type *) calloc (1, sizeof (Type));
127 hb_object_init (obj);
128 hb_object_trace (obj, HB_FUNC);
131 template <typename Type>
132 static inline void hb_object_init (Type *obj)
134 obj->header.ref_count.init (1);
135 obj->header.user_data = nullptr;
137 template <typename Type>
138 static inline bool hb_object_is_inert (const Type *obj)
140 return unlikely (obj->header.ref_count.is_inert ());
142 template <typename Type>
143 static inline bool hb_object_is_valid (const Type *obj)
145 return likely (obj->header.ref_count.is_valid ());
147 template <typename Type>
148 static inline Type *hb_object_reference (Type *obj)
150 hb_object_trace (obj, HB_FUNC);
151 if (unlikely (!obj || hb_object_is_inert (obj)))
153 assert (hb_object_is_valid (obj));
154 obj->header.ref_count.inc ();
157 template <typename Type>
158 static inline bool hb_object_destroy (Type *obj)
160 hb_object_trace (obj, HB_FUNC);
161 if (unlikely (!obj || hb_object_is_inert (obj)))
163 assert (hb_object_is_valid (obj));
164 if (obj->header.ref_count.dec () != 1)
167 hb_object_fini (obj);
170 template <typename Type>
171 static inline void hb_object_fini (Type *obj)
173 obj->header.ref_count.fini (); /* Do this before user_data */
174 if (obj->header.user_data)
176 obj->header.user_data->fini ();
177 free (obj->header.user_data);
180 template <typename Type>
181 static inline bool hb_object_set_user_data (Type *obj,
182 hb_user_data_key_t *key,
184 hb_destroy_func_t destroy,
187 if (unlikely (!obj || hb_object_is_inert (obj)))
189 assert (hb_object_is_valid (obj));
192 hb_user_data_array_t *user_data = (hb_user_data_array_t *) hb_atomic_ptr_get (&obj->header.user_data);
193 if (unlikely (!user_data))
195 user_data = (hb_user_data_array_t *) calloc (sizeof (hb_user_data_array_t), 1);
196 if (unlikely (!user_data))
199 if (unlikely (!hb_atomic_ptr_cmpexch (&obj->header.user_data, nullptr, user_data)))
207 return user_data->set (key, data, destroy, replace);
210 template <typename Type>
211 static inline void *hb_object_get_user_data (Type *obj,
212 hb_user_data_key_t *key)
214 if (unlikely (!obj || hb_object_is_inert (obj) || !obj->header.user_data))
216 assert (hb_object_is_valid (obj));
217 return obj->header.user_data->get (key);
221 #endif /* HB_OBJECT_PRIVATE_HH */