kc3-lang/harfbuzz/src/hb-shaper-private.hh

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• Hash : 69fd6e15
  Author :
  Date : 2013-01-10T00:03:36
  

  Fix crasher during multi-thread shaper data creation
  
  Sample crash:
  
  0  _hb_graphite2_shaper_face_data_destroy (data=0xffffffffffffffff)
      at ../../src/hb-graphite2.cc:129
  1  0x00007ffff4271d7d in hb_graphite2_shaper_face_data_ensure (
      face=<optimized out>) at ../../src/hb-shaper-list.hh:35
  2  hb_shape_plan_plan (shaper_list=<optimized out>, num_user_features=0,
      user_features=0x0, shape_plan=0xf7b490) at ../../src/hb-shaper-list.hh:35
  3  hb_shape_plan_create (face=<optimized out>, props=<optimized out>,
      user_features=0x0, num_user_features=0, shaper_list=<optimized out>)
      at ../../src/hb-shape-plan.cc:108
  4  0x00007ffff4272c93 in hb_shape_plan_create_cached (face=0x10cf2b0,
      props=0x11980d8, user_features=0x0, num_user_features=<optimized out>,
      shaper_list=0x0) at ../../src/hb-shape-plan.cc:283
  

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• src/hb-shaper-private.hh

• /*
   * Copyright © 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.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_SHAPER_PRIVATE_HH
  #define HB_SHAPER_PRIVATE_HH
  
  #include "hb-private.hh"
  
  typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t    *shape_plan,
  				   hb_font_t          *font,
  				   hb_buffer_t        *buffer,
  				   const hb_feature_t *features,
  				   unsigned int        num_features);
  
  #define HB_SHAPER_IMPLEMENT(name) \
  	extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape;
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  
  struct hb_shaper_pair_t {
    char name[16];
    hb_shape_func_t *func;
  };
  
  HB_INTERNAL const hb_shaper_pair_t *
  _hb_shapers_get (void);
  
  
  /* For embedding in face / font / ... */
  struct hb_shaper_data_t {
  #define HB_SHAPER_IMPLEMENT(shaper) void *shaper;
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  };
  
  #define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *))
  
  /* Means: succeeded, but don't need to keep any data. */
  #define HB_SHAPER_DATA_SUCCEEDED ((void *) +1)
  
  /* Means: tried but failed to create. */
  #define HB_SHAPER_DATA_INVALID ((void *) -1)
  #define HB_SHAPER_DATA_IS_INVALID(data) ((void *) (data) == HB_SHAPER_DATA_INVALID)
  
  #define HB_SHAPER_DATA_TYPE(shaper, object)		struct hb_##shaper##_shaper_##object##_data_t
  #define HB_SHAPER_DATA_INSTANCE(shaper, object, instance)	(* (HB_SHAPER_DATA_TYPE(shaper, object) **) &(instance)->shaper_data.shaper)
  #define HB_SHAPER_DATA(shaper, object)			HB_SHAPER_DATA_INSTANCE (shaper, object, object)
  #define HB_SHAPER_DATA_CREATE_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_create
  #define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object)	_hb_##shaper##_shaper_##object##_data_destroy
  
  #define HB_SHAPER_DATA_PROTOTYPE(shaper, object) \
  	HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \
  	extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \
  	HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS); \
  	extern "C" HB_INTERNAL void \
  	HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *data)
  
  #define HB_SHAPER_DATA_DESTROY(shaper, object) \
  	if (object->shaper_data.shaper && \
  	    object->shaper_data.shaper != HB_SHAPER_DATA_INVALID && \
  	    object->shaper_data.shaper != HB_SHAPER_DATA_SUCCEEDED) \
  	  HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA (shaper, object));
  
  #define HB_SHAPER_DATA_ENSURE_DECLARE(shaper, object) \
  static inline bool \
  hb_##shaper##_shaper_##object##_data_ensure (hb_##object##_t *object) \
  {\
    retry: \
    HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
    if (unlikely (!data)) { \
      data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
      if (unlikely (!data)) \
        data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \
      if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), NULL, data)) { \
        if (data && \
  	  data != HB_SHAPER_DATA_INVALID && \
  	  data != HB_SHAPER_DATA_SUCCEEDED) \
  	HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
        goto retry; \
      } \
    } \
    return data != NULL && !HB_SHAPER_DATA_IS_INVALID (data); \
  }
  
  
  #endif /* HB_SHAPER_PRIVATE_HH */
  

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