hb-object-private.hh revision ba8d94ce3360bfaf2c530d01f2af69237018a531
1f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod/* 235a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod * Copyright (C) 2007 Chris Wilson 335a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod * Copyright (C) 2009 Red Hat, Inc. 4f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * 5f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * This is part of HarfBuzz, an OpenType Layout engine library. 6f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * 7f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * Permission is hereby granted, without written agreement and without 8f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * license or royalty fees, to use, copy, modify, and distribute this 9f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * software and its documentation for any purpose, provided that the 10f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * above copyright notice and the following two paragraphs appear in 11f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * all copies of this software. 12f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * 13f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * DAMAGE. 18f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * 19f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * 25f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * Contributor(s): 26f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod * Chris Wilson <chris@chris-wilson.co.uk> 2735a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod * Red Hat Author(s): Behdad Esfahbod 28f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod */ 29f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 30f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#ifndef HB_REFCOUNT_PRIVATE_H 31f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFCOUNT_PRIVATE_H 32f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 33f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbodtypedef int hb_atomic_int_t; 34f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 35f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod/* Encapsulate operations on the object's reference count */ 36f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbodtypedef struct { 37f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod hb_atomic_int_t ref_count; 38f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod} hb_reference_count_t; 39f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 40f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod/* XXX add real atomic ops */ 41f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define _hb_reference_count_inc(RC) ((RC).ref_count++) 42f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define _hb_reference_count_dec_and_test(RC) ((RC).ref_count-- == 1) 43f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 44f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE)) 45f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 46f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_GET_VALUE(RC) ((RC).ref_count+0) 47f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) ((RC).ref_count = (VALUE), 0) 48f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 49f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1) 50f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE} 51f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 52f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE) 53f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 54f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0) 55f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod 5635a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 57c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod 5835a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod/* Helper macros */ 5935a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 60c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod#define HB_OBJECT_IS_INERT(obj) \ 61c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod ((obj) == NULL || HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)) 62c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod 63ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod#define HB_OBJECT_DO_INIT_EXPR(obj) \ 64ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod HB_REFERENCE_COUNT_INIT (obj->ref_count, 1) 65ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod 66ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod#define HB_OBJECT_DO_INIT(obj) \ 6735a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod HB_STMT_START { \ 68ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod HB_OBJECT_DO_INIT_EXPR (obj); \ 6935a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod } HB_STMT_END 7035a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 71ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod#define HB_OBJECT_DO_CREATE(obj) \ 72ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod HB_LIKELY (( \ 73ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod (obj) = calloc (1, sizeof (*(obj))), \ 74ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod HB_OBJECT_DO_INIT_EXPR (obj), \ 75ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod (obj) \ 76ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod )) 77ba8d94ce3360bfaf2c530d01f2af69237018a531Behdad Esfahbod 78c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod#define HB_OBJECT_DO_REFERENCE(obj) \ 7935a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod HB_STMT_START { \ 80c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod if (HB_OBJECT_IS_INERT (obj)) \ 8135a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod return obj; \ 8235a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod assert (HB_REFERENCE_COUNT_HAS_REFERENCE (obj->ref_count)); \ 8335a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod _hb_reference_count_inc (obj->ref_count); \ 8435a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod return obj; \ 8535a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod } HB_STMT_END 8635a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 87c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod#define HB_OBJECT_DO_DESTROY(obj) \ 8835a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod HB_STMT_START { \ 89c62b503770325819f249885dfc9d4683a69c9efdBehdad Esfahbod if (HB_OBJECT_IS_INERT (obj)) \ 9035a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod return; \ 9135a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod assert (HB_REFERENCE_COUNT_HAS_REFERENCE (obj->ref_count)); \ 9235a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod if (!_hb_reference_count_dec_and_test (obj->ref_count)) \ 9335a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod return; \ 9435a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod } HB_STMT_END 9535a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 9635a7383c6138fd705560f0d4bb30659cbd1ab64cBehdad Esfahbod 97f0954d1e08ae288eda9904e17108fc73f48c0b98Behdad Esfahbod#endif /* HB_REFCOUNT_PRIVATE_H */ 98