kc3-lang/harfbuzz/src/hb-object-private.h

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• Hash : 64d3fc8d
  Author :
  Date : 2010-05-03T22:51:19
  

  Cosmetic: Rename HB_LIKELY/HB_UNLIKELY to likely/unlikely
  

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• src/hb-object-private.h

• /*
   * Copyright (C) 2007 Chris Wilson
   * Copyright (C) 2009,2010  Red Hat, 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
   */
  
  #ifndef HB_REFCOUNT_PRIVATE_H
  #define HB_REFCOUNT_PRIVATE_H
  
  #include "hb-private.h"
  
  
  
  /* Encapsulate operations on the object's reference count */
  typedef struct {
    hb_atomic_int_t ref_count;
  } hb_reference_count_t;
  
  #define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
  #define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, -1)
  
  #define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
  
  #define HB_REFERENCE_COUNT_GET_VALUE(RC) hb_atomic_int_get ((RC).ref_count)
  #define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
  
  #define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
  #define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
  
  #define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
  
  #define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
  
  
  
  /* Debug */
  
  #ifndef HB_DEBUG_OBJECT
  #define HB_DEBUG_OBJECT HB_DEBUG+0
  #endif
  
  static inline hb_bool_t /* always returns TRUE */
  _hb_object_debug_out (const void *obj,
  		      hb_reference_count_t *ref_count,
  		      const char *function)
  {
    if (HB_DEBUG_OBJECT)
      fprintf (stderr, "%p refcount=%d %s\n",
  	     obj,
  	     HB_REFERENCE_COUNT_GET_VALUE (*ref_count),
  	     function);
    return TRUE;
  }
  
  #define HB_OBJECT_DEBUG_OUT(obj) _hb_object_debug_out ((void *) obj, &obj->ref_count, __FUNCTION__)
  
  
  
  /* Object allocation and lifecycle manamgement macros */
  
  #define HB_OBJECT_IS_INERT(obj) \
      (unlikely (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
  
  #define HB_OBJECT_DO_INIT_EXPR(obj) \
      HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
  
  #define HB_OBJECT_DO_INIT(obj) \
    HB_STMT_START { \
      HB_OBJECT_DO_INIT_EXPR (obj); \
    } HB_STMT_END
  
  #define HB_OBJECT_DO_CREATE(Type, obj) \
    likely (( \
  	       (void) ( \
  		 ((obj) = (Type *) calloc (1, sizeof (Type))) && \
  		 HB_OBJECT_DO_INIT_EXPR (obj) && \
  		 HB_OBJECT_DEBUG_OUT (obj) \
  	       ), \
  	       (obj) \
  	     ))
  
  #define HB_OBJECT_DO_REFERENCE(obj) \
    HB_STMT_START { \
      int old_count; \
      if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
        return obj; \
      HB_OBJECT_DEBUG_OUT (obj); \
      old_count = hb_reference_count_inc (obj->ref_count); \
      assert (old_count > 0); \
      return obj; \
    } HB_STMT_END
  
  #define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
    HB_STMT_START { \
      if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
        return 0; \
      return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
    } HB_STMT_END
  
  #define HB_OBJECT_DO_DESTROY(obj) \
    HB_STMT_START { \
      int old_count; \
      if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
        return; \
      HB_OBJECT_DEBUG_OUT (obj); \
      old_count = hb_reference_count_dec (obj->ref_count); \
      assert (old_count > 0); \
      if (old_count != 1) \
        return; \
    } HB_STMT_END
  
  
  
  #endif /* HB_REFCOUNT_PRIVATE_H */
  

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