Merge branch 'master' into cff-subset

NEWS

+Overview of changes leading to 1.8.8
+Tuesday, August 14, 2018
+====================================
+- Fix hb-icu crash on architectures where compare_exchange_weak() can
+  fail falsely.  This bug was introduced in 1.8.4.
+  https://bugs.chromium.org/p/chromium/issues/detail?id=873568
+- More internal refactoring of atomic operations and singletons.
+- API changes:
+  The following functions do NOT reference their return value before
+  returning:
+  * hb_unicode_funcs_get_default()
+  * hb_glib_get_unicode_funcs()
+  * hb_icu_get_unicode_funcs()
+  This is consistent with their naming ("get", instead of "reference")
+  as well as how they are used in the wild (ie. no one calls destroy()
+  on their return value.)
+
+
 Overview of changes leading to 1.8.7
 Wednesday, August 8, 2018
 ====================================

configure.ac

 AC_PREREQ([2.64])
 AC_INIT([HarfBuzz],
-        [1.8.7],
+        [1.8.8],
         [https://github.com/harfbuzz/harfbuzz/issues/new],
         [harfbuzz],
         [http://harfbuzz.org/])

src/hb-buffer.cc

@@ -216,7 +216,7 @@ hb_buffer_t::reset (void)
     return;
 
   hb_unicode_funcs_destroy (unicode);
-  unicode = hb_unicode_funcs_get_default ();
+  unicode = hb_unicode_funcs_reference (hb_unicode_funcs_get_default ());
   flags = HB_BUFFER_FLAG_DEFAULT;
   replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
 
@@ -908,7 +908,6 @@ hb_buffer_set_unicode_funcs (hb_buffer_t        *buffer,
   if (!unicode_funcs)
     unicode_funcs = hb_unicode_funcs_get_default ();
 
-
   hb_unicode_funcs_reference (unicode_funcs);
   hb_unicode_funcs_destroy (buffer->unicode);
   buffer->unicode = unicode_funcs;

src/hb-common.cc

@@ -28,6 +28,7 @@
 
 #include "hb-private.hh"
 
+#include "hb-machinery-private.hh"
 
 #include <locale.h>
 #ifdef HAVE_XLOCALE_H
@@ -730,48 +731,48 @@ parse_uint32 (const char **pp, const char *end, uint32_t *pv)
 
 #ifdef USE_XLOCALE
 
-static hb_atomic_ptr_t<HB_LOCALE_T> C_locale;
-
 #ifdef HB_USE_ATEXIT
-static void
-free_C_locale (void)
-{
-retry:
-  HB_LOCALE_T locale = C_locale.get ();
-
-  if (unlikely (!C_locale.cmpexch (locale, nullptr)))
-    goto retry;
-
-  if (locale)
-    HB_FREE_LOCALE (locale);
-}
+static void free_static_C_locale (void);
 #endif
 
-static HB_LOCALE_T
-get_C_locale (void)
+static struct hb_C_locale_lazy_loader_t : hb_lazy_loader_t<hb_remove_ptr_t<HB_LOCALE_T>::value,
+							  hb_C_locale_lazy_loader_t>
 {
-retry:
-  HB_LOCALE_T C = C_locale.get ();
-
-  if (unlikely (!C))
+  static inline HB_LOCALE_T create (void)
   {
-    C = HB_CREATE_LOCALE ("C");
-
-    if (unlikely (!C_locale.cmpexch (nullptr, C)))
-    {
-      HB_FREE_LOCALE (C);
-      goto retry;
-    }
+    HB_LOCALE_T C_locale = HB_CREATE_LOCALE ("C");
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_C_locale); /* First person registers atexit() callback. */
+    atexit (free_static_C_locale);
 #endif
+
+    return C_locale;
+  }
+  static inline void destroy (HB_LOCALE_T p)
+  {
+    HB_FREE_LOCALE (p);
+  }
+  static inline HB_LOCALE_T get_null (void)
+  {
+    return nullptr;
   }
+} static_C_locale;
 
-  return C;
+#ifdef HB_USE_ATEXIT
+static
+void free_static_C_locale (void)
+{
+  static_C_locale.free_instance ();
 }
 #endif
 
+static HB_LOCALE_T
+get_C_locale (void)
+{
+  return static_C_locale.get_unconst ();
+}
+#endif /* USE_XLOCALE */
+
 static bool
 parse_float (const char **pp, const char *end, float *pv)
 {
@@ -847,7 +848,7 @@ parse_tag (const char **pp, const char *end, hb_tag_t *tag)
   }
 
   const char *p = *pp;
-  while (*pp < end && ISALNUM(**pp))
+  while (*pp < end && (ISALNUM(**pp) || **pp == '_'))
     (*pp)++;
 
   if (p == *pp || *pp - p > 4)

src/hb-ft.cc

@@ -32,6 +32,7 @@
 #include "hb-ft.h"
 
 #include "hb-font-private.hh"
+#include "hb-machinery-private.hh"
 
 #include FT_ADVANCES_H
 #include FT_MULTIPLE_MASTERS_H
@@ -416,30 +417,15 @@ hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
   return true;
 }
 
-static hb_atomic_ptr_t<hb_font_funcs_t> static_ft_funcs;
-
 #ifdef HB_USE_ATEXIT
-static
-void free_static_ft_funcs (void)
-{
-retry:
-  hb_font_funcs_t *ft_funcs = static_ft_funcs.get ();
-  if (unlikely (!static_ft_funcs.cmpexch (ft_funcs, nullptr)))
-    goto retry;
-
-  hb_font_funcs_destroy (ft_funcs);
-}
+static void free_static_ft_funcs (void);
 #endif
 
-static void
-_hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref)
+static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft_font_funcs_lazy_loader_t>
 {
-retry:
-  hb_font_funcs_t *funcs = static_ft_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_font_funcs_t *create (void)
   {
-    funcs = hb_font_funcs_create ();
+    hb_font_funcs_t *funcs = hb_font_funcs_create ();
 
     hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, nullptr, nullptr);
     //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, nullptr, nullptr);
@@ -458,21 +444,35 @@ retry:
 
     hb_font_funcs_make_immutable (funcs);
 
-    if (unlikely (!static_ft_funcs. cmpexch (nullptr, funcs)))
-    {
-      hb_font_funcs_destroy (funcs);
-      goto retry;
-    }
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_ft_funcs);
+#endif
+
+    return funcs;
+  }
+} static_ft_funcs;
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_ft_funcs); /* First person registers atexit() callback. */
+static
+void free_static_ft_funcs (void)
+{
+  static_ft_funcs.free_instance ();
+}
 #endif
-  };
 
+static hb_font_funcs_t *
+_hb_ft_get_font_funcs (void)
+{
+  return static_ft_funcs.get_unconst ();
+}
+
+static void
+_hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref)
+{
   bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL;
 
   hb_font_set_funcs (font,
-		     funcs,
+		     _hb_ft_get_font_funcs (),
 		     _hb_ft_font_create (ft_face, symbol, unref),
 		     _hb_ft_font_destroy);
 }
@@ -684,48 +684,47 @@ hb_ft_font_create_referenced (FT_Face ft_face)
   return hb_ft_font_create (ft_face, _hb_ft_face_destroy);
 }
 
+#ifdef HB_USE_ATEXIT
+static void free_static_ft_library (void);
+#endif
 
-/* Thread-safe, lock-free, FT_Library */
+static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_ptr_t<FT_Library>::value,
+							     hb_ft_library_lazy_loader_t>
+{
+  static inline FT_Library create (void)
+  {
+    FT_Library l;
+    if (FT_Init_FreeType (&l))
+      return nullptr;
+
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_ft_library);
+#endif
 
-static hb_atomic_ptr_t<FT_Library> ft_library;
+    return l;
+  }
+  static inline void destroy (FT_Library l)
+  {
+    FT_Done_FreeType (l);
+  }
+  static inline FT_Library get_null (void)
+  {
+    return nullptr;
+  }
+} static_ft_library;
 
 #ifdef HB_USE_ATEXIT
 static
-void free_ft_library (void)
+void free_static_ft_library (void)
 {
-retry:
-  FT_Library library = ft_library.get ();
-  if (unlikely (!ft_library.cmpexch (library, nullptr)))
-    goto retry;
-
-  FT_Done_FreeType (library);
+  static_ft_library.free_instance ();
 }
 #endif
 
 static FT_Library
 get_ft_library (void)
 {
-retry:
-  FT_Library library = ft_library.get ();
-
-  if (unlikely (!library))
-  {
-    /* Not found; allocate one. */
-    if (FT_Init_FreeType (&library))
-      return nullptr;
-
-    if (unlikely (!ft_library.cmpexch (nullptr, library)))
-    {
-      FT_Done_FreeType (library);
-      goto retry;
-    }
-
-#ifdef HB_USE_ATEXIT
-    atexit (free_ft_library); /* First person registers atexit() callback. */
-#endif
-  }
-
-  return library;
+  return static_ft_library.get_unconst ();
 }
 
 static void

src/hb-glib.cc

@@ -31,6 +31,7 @@
 #include "hb-glib.h"
 
 #include "hb-unicode-private.hh"
+#include "hb-machinery-private.hh"
 
 
 #if !GLIB_CHECK_VERSION(2,29,14)
@@ -364,30 +365,16 @@ hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   return utf8_decomposed_len;
 }
 
-static hb_atomic_ptr_t<hb_unicode_funcs_t> static_glib_funcs;
 
 #ifdef HB_USE_ATEXIT
-static
-void free_static_glib_funcs (void)
-{
-retry:
-  hb_unicode_funcs_t *glib_funcs = static_glib_funcs.get ();
-  if (unlikely (!static_glib_funcs.cmpexch (glib_funcs, nullptr)))
-    goto retry;
-
-  hb_unicode_funcs_destroy (glib_funcs);
-}
+static void free_static_glib_funcs (void);
 #endif
 
-hb_unicode_funcs_t *
-hb_glib_get_unicode_funcs (void)
+static struct hb_glib_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_glib_unicode_funcs_lazy_loader_t>
 {
-retry:
-  hb_unicode_funcs_t *funcs = static_glib_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_unicode_funcs_t *create (void)
   {
-    funcs = hb_unicode_funcs_create (nullptr);
+    hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
 
 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
     hb_unicode_funcs_set_##name##_func (funcs, hb_glib_unicode_##name, nullptr, nullptr);
@@ -396,20 +383,30 @@ retry:
 
     hb_unicode_funcs_make_immutable (funcs);
 
-    if (unlikely (!static_glib_funcs.cmpexch (nullptr, funcs)))
-    {
-      hb_unicode_funcs_destroy (funcs);
-      goto retry;
-    }
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_glib_funcs);
+#endif
+
+    return funcs;
+  }
+} static_glib_funcs;
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_glib_funcs); /* First person registers atexit() callback. */
+static
+void free_static_glib_funcs (void)
+{
+  static_glib_funcs.free_instance ();
+}
 #endif
-  };
 
-  return hb_unicode_funcs_reference (funcs);
+hb_unicode_funcs_t *
+hb_glib_get_unicode_funcs (void)
+{
+  return static_glib_funcs.get_unconst ();
 }
 
+
+
 #if GLIB_CHECK_VERSION(2,31,10)
 
 static void

src/hb-icu.cc

@@ -32,6 +32,7 @@
 #include "hb-icu.h"
 
 #include "hb-unicode-private.hh"
+#include "hb-machinery-private.hh"
 
 #include <unicode/uchar.h>
 #include <unicode/unorm2.h>
@@ -164,10 +165,6 @@ hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   return hb_icu_script_to_script (scriptCode);
 }
 
-#if U_ICU_VERSION_MAJOR_NUM >= 49
-static hb_atomic_ptr_t <const UNormalizer2> normalizer;
-#endif
-
 static hb_bool_t
 hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 			hb_codepoint_t      a,
@@ -177,7 +174,8 @@ hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 {
 #if U_ICU_VERSION_MAJOR_NUM >= 49
   {
-    UChar32 ret = unorm2_composePair (normalizer.get (), a, b);
+    const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
+    UChar32 ret = unorm2_composePair (normalizer, a, b);
     if (ret < 0) return false;
     *ab = ret;
     return true;
@@ -222,10 +220,11 @@ hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 {
 #if U_ICU_VERSION_MAJOR_NUM >= 49
   {
+    const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
     UChar decomposed[4];
     int len;
     UErrorCode icu_err = U_ZERO_ERROR;
-    len = unorm2_getRawDecomposition (normalizer.get (), ab, decomposed,
+    len = unorm2_getRawDecomposition (normalizer, ab, decomposed,
 				      ARRAY_LENGTH (decomposed), &icu_err);
     if (U_FAILURE (icu_err) || len < 0) return false;
 
@@ -344,58 +343,48 @@ hb_icu_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   return utf32_len;
 }
 
-
-static hb_atomic_ptr_t<hb_unicode_funcs_t> static_icu_funcs;
-
 #ifdef HB_USE_ATEXIT
-static
-void free_static_icu_funcs (void)
-{
-retry:
-  hb_unicode_funcs_t *icu_funcs = static_icu_funcs.get ();
-  if (unlikely (!static_icu_funcs.cmpexch (icu_funcs, nullptr)))
-    goto retry;
-
-  hb_unicode_funcs_destroy (icu_funcs);
-}
+static void free_static_icu_funcs (void);
 #endif
 
-hb_unicode_funcs_t *
-hb_icu_get_unicode_funcs (void)
+static struct hb_icu_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_icu_unicode_funcs_lazy_loader_t>
 {
-retry:
-  hb_unicode_funcs_t *funcs = static_icu_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_unicode_funcs_t *create (void)
   {
+    void *user_data = nullptr;
 #if U_ICU_VERSION_MAJOR_NUM >= 49
-    if (!normalizer.get ())
-    {
-      UErrorCode icu_err = U_ZERO_ERROR;
-      /* We ignore failure in getNFCInstace(). */
-      (void) normalizer.cmpexch (nullptr, unorm2_getNFCInstance (&icu_err));
-    }
+    UErrorCode icu_err = U_ZERO_ERROR;
+    user_data = (void *) unorm2_getNFCInstance (&icu_err);
+    assert (user_data);
 #endif
 
-    funcs = hb_unicode_funcs_create (nullptr);
+    hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
 
 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
-    hb_unicode_funcs_set_##name##_func (funcs, hb_icu_unicode_##name, nullptr, nullptr);
+    hb_unicode_funcs_set_##name##_func (funcs, hb_icu_unicode_##name, user_data, nullptr);
       HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
 
     hb_unicode_funcs_make_immutable (funcs);
 
-    if (unlikely (!static_icu_funcs.cmpexch (nullptr, funcs)))
-    {
-      hb_unicode_funcs_destroy (funcs);
-      goto retry;
-    }
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_icu_funcs);
+#endif
+
+    return funcs;
+  }
+} static_icu_funcs;
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_icu_funcs); /* First person registers atexit() callback. */
+static
+void free_static_icu_funcs (void)
+{
+  static_icu_funcs.free_instance ();
+}
 #endif
-  };
 
-  return hb_unicode_funcs_reference (funcs);
+hb_unicode_funcs_t *
+hb_icu_get_unicode_funcs (void)
+{
+  return static_icu_funcs.get_unconst ();
 }

src/hb-iter-private.hh

@@ -72,7 +72,7 @@ struct Iter<T *>
     array (array_), length (length_) {}
 
   /* Emptiness. */
-  inline operator bool (void) const { return bool (length); }
+  explicit_operator inline operator bool (void) const { return bool (length); }
 
   /* Current item. */
   inline T &operator * (void)

src/hb-machinery-private.hh

@@ -590,32 +590,82 @@ struct BEInt<Type, 4>
  * Lazy loaders.
  */
 
-template <unsigned int WheresFace,
-	  typename Subclass,
-	  typename Returned,
-	  typename Stored = Returned>
-struct hb_lazy_loader_t
+template <typename Data, unsigned int WheresData>
+struct hb_data_wrapper_t
 {
-  static_assert (WheresFace > 0, "");
+  static_assert (WheresData > 0, "");
 
-  /* https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern */
-  inline const Subclass* thiz (void) const { return static_cast<const Subclass *> (this); }
-  inline Subclass* thiz (void) { return static_cast<Subclass *> (this); }
+  inline Data * get_data (void) const
+  {
+    return *(((Data **) (void *) this) - WheresData);
+  }
 
-  inline void init0 (void) {} /* Init, when memory is already set to 0. No-op for us. */
-  inline void init (void)
+  template <typename Stored, typename Subclass>
+  inline Stored * call_create (void) const
   {
-    instance.set_relaxed (nullptr);
+    Data *data = this->get_data ();
+    return likely (data) ? Subclass::create (data) : nullptr;
   }
+};
+template <>
+struct hb_data_wrapper_t<void, 0>
+{
+  template <typename Stored, typename Funcs>
+  inline Stored * call_create (void) const
+  {
+    return Funcs::create ();
+  }
+};
+
+template <typename T1, typename T2> struct hb_non_void_t { typedef T1 value; };
+template <typename T2> struct hb_non_void_t<void, T2> { typedef T2 value; };
+
+template <typename Returned,
+	  typename Subclass = void,
+	  typename Data = void,
+	  unsigned int WheresData = 0,
+	  typename Stored = Returned>
+struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
+{
+  typedef typename hb_non_void_t<Subclass,
+				 hb_lazy_loader_t<Returned,Subclass,Data,WheresData,Stored>
+				>::value Funcs;
+
+  inline void init0 (void) {} /* Init, when memory is already set to 0. No-op for us. */
+  inline void init (void) { instance.set_relaxed (nullptr); }
   inline void fini (void)
   {
-    Stored *p = this->instance.get ();
-    if (p)
-      thiz ()->destroy (p);
+    do_destroy (instance.get ());
+  }
+  inline void free_instance (void)
+  {
+  retry:
+    Stored *p = instance.get ();
+    if (unlikely (p && !this->instance.cmpexch (p, nullptr)))
+      goto retry;
+    do_destroy (p);
+  }
+
+  inline Stored * do_create (void) const
+  {
+    Stored *p = this->template call_create<Stored, Funcs> ();
+    if (unlikely (!p))
+      p = const_cast<Stored *> (Funcs::get_null ());
+    return p;
+  }
+  static inline void do_destroy (Stored *p)
+  {
+    if (p && p != Funcs::get_null ())
+      Funcs::destroy (p);
   }
 
-  inline const Returned * operator -> (void) const { return thiz ()->get (); }
-  inline const Returned & operator * (void) const { return *thiz ()->get (); }
+  inline const Returned * operator -> (void) const { return get (); }
+  inline const Returned & operator * (void) const { return *get (); }
+
+  inline Data * get_data (void) const
+  {
+    return *(((Data **) this) - WheresData);
+  }
 
   inline Stored * get_stored (void) const
   {
@@ -623,15 +673,10 @@ struct hb_lazy_loader_t
     Stored *p = this->instance.get ();
     if (unlikely (!p))
     {
-      hb_face_t *face = *(((hb_face_t **) this) - WheresFace);
-      if (likely (!p))
-	p = thiz ()->create (face);
-      if (unlikely (!p))
-	p = thiz ()->create (nullptr); /* Produce nil object. */
-      assert (p);
+      p = do_create ();
       if (unlikely (!this->instance.cmpexch (nullptr, p)))
       {
-        thiz ()->destroy (p);
+        do_destroy (p);
 	goto retry;
       }
     }
@@ -644,23 +689,38 @@ struct hb_lazy_loader_t
      * However, to make TSan, etc, happy, we using cmpexch. */
   retry:
     Stored *p = this->instance.get ();
-    if (p)
-    {
-      if (unlikely (!this->instance.cmpexch (p, instance_)))
-        goto retry;
-      thiz ()->destroy (p);
-    }
+    if (unlikely (!this->instance.cmpexch (p, instance_)))
+      goto retry;
+    do_destroy (p);
   }
 
-  inline const Returned * get (void) const
+  inline const Returned * get (void) const { return Funcs::convert (get_stored ()); }
+  inline Returned * get_unconst (void) const { return const_cast<Returned *> (Funcs::convert (get_stored ())); }
+
+  /* To be possibly overloaded by subclasses. */
+  static inline Returned* convert (Stored *p) { return p; }
+
+  /* By default null/init/fini the object. */
+  static inline const Stored* get_null (void) { return &Null(Stored); }
+  static inline Stored *create (Data *data)
   {
-    return thiz ()->convert (get_stored ());
+    Stored *p = (Stored *) calloc (1, sizeof (Stored));
+    if (likely (p))
+      p->init (data);
+    return p;
   }
-
-  static inline const Returned* convert (const Stored *p)
+  static inline Stored *create (void)
   {
+    Stored *p = (Stored *) calloc (1, sizeof (Stored));
+    if (likely (p))
+      p->init ();
     return p;
   }
+  static inline void destroy (Stored *p)
+  {
+    p->fini ();
+    free (p);
+  }
 
   private:
   /* Must only have one pointer. */
@@ -670,42 +730,28 @@ struct hb_lazy_loader_t
 /* Specializations. */
 
 template <unsigned int WheresFace, typename T>
-struct hb_object_lazy_loader_t : hb_lazy_loader_t<WheresFace, hb_object_lazy_loader_t<WheresFace, T>, T>
-{
-  static inline T *create (hb_face_t *face)
-  {
-    if (unlikely (!face))
-      return const_cast<T *> (&Null(T));
-    T *p = (T *) calloc (1, sizeof (T));
-    if (unlikely (!p))
-      p = const_cast<T *> (&Null(T));
-    else
-      p->init (face);
-    return p;
-  }
-  static inline void destroy (T *p)
-  {
-    if (p != &Null(T))
-    {
-      p->fini();
-      free (p);
-    }
-  }
-};
-
-template <unsigned int WheresFace, typename T>
-struct hb_table_lazy_loader_t : hb_lazy_loader_t<WheresFace, hb_table_lazy_loader_t<WheresFace, T>, T, hb_blob_t>
+struct hb_face_lazy_loader_t : hb_lazy_loader_t<T,
+						hb_face_lazy_loader_t<WheresFace, T>,
+						hb_face_t, WheresFace> {};
+
+template <typename T, unsigned int WheresFace>
+struct hb_table_lazy_loader_t : hb_lazy_loader_t<T,
+						 hb_table_lazy_loader_t<T, WheresFace>,
+						 hb_face_t, WheresFace,
+						 hb_blob_t>
 {
   static inline hb_blob_t *create (hb_face_t *face)
   {
-    if (unlikely (!face))
-      return hb_blob_get_empty ();
     return hb_sanitize_context_t ().reference_table<T> (face);
   }
   static inline void destroy (hb_blob_t *p)
   {
     hb_blob_destroy (p);
   }
+  static inline const hb_blob_t *get_null (void)
+  {
+      return hb_blob_get_empty ();
+  }
   static inline const T* convert (const hb_blob_t *blob)
   {
     return blob->as<T> ();
@@ -717,5 +763,30 @@ struct hb_table_lazy_loader_t : hb_lazy_loader_t<WheresFace, hb_table_lazy_loade
   }
 };
 
+template <typename Subclass>
+struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<hb_font_funcs_t, Subclass>
+{
+  static inline void destroy (hb_font_funcs_t *p)
+  {
+    hb_font_funcs_destroy (p);
+  }
+  static inline const hb_font_funcs_t *get_null (void)
+  {
+      return hb_font_funcs_get_empty ();
+  }
+};
+template <typename Subclass>
+struct hb_unicode_funcs_lazy_loader_t : hb_lazy_loader_t<hb_unicode_funcs_t, Subclass>
+{
+  static inline void destroy (hb_unicode_funcs_t *p)
+  {
+    hb_unicode_funcs_destroy (p);
+  }
+  static inline const hb_unicode_funcs_t *get_null (void)
+  {
+      return hb_unicode_funcs_get_empty ();
+  }
+};
+
 
 #endif /* HB_MACHINERY_PRIVATE_HH */

src/hb-ot-font.cc

@@ -29,6 +29,7 @@
 #include "hb-ot.h"
 
 #include "hb-font-private.hh"
+#include "hb-machinery-private.hh"
 
 #include "hb-ot-cmap-table.hh"
 #include "hb-ot-glyf-table.hh"
@@ -72,10 +73,10 @@ struct hb_ot_font_t
   OT::vmtx::accelerator_t v_metrics;
 
   hb_face_t *face; /* MUST be JUST before the lazy loaders. */
-  hb_object_lazy_loader_t<1, OT::glyf::accelerator_t> glyf;
-  hb_object_lazy_loader_t<2, OT::CBDT::accelerator_t> cbdt;
-  hb_object_lazy_loader_t<3, OT::post::accelerator_t> post;
-  hb_object_lazy_loader_t<4, OT::kern::accelerator_t> kern;
+  hb_face_lazy_loader_t<1, OT::glyf::accelerator_t> glyf;
+  hb_face_lazy_loader_t<2, OT::CBDT::accelerator_t> cbdt;
+  hb_face_lazy_loader_t<3, OT::post::accelerator_t> post;
+  hb_face_lazy_loader_t<4, OT::kern::accelerator_t> kern;
 };
 
 
@@ -227,30 +228,15 @@ hb_ot_get_font_v_extents (hb_font_t *font,
   return ot_font->v_metrics.has_font_extents;
 }
 
-static hb_atomic_ptr_t <hb_font_funcs_t> static_ot_funcs;
-
 #ifdef HB_USE_ATEXIT
-static
-void free_static_ot_funcs (void)
-{
-retry:
-  hb_font_funcs_t *ot_funcs = static_ot_funcs.get ();
-  if (unlikely (!static_ot_funcs.cmpexch (ot_funcs, nullptr)))
-    goto retry;
-
-  hb_font_funcs_destroy (ot_funcs);
-}
+static void free_static_ot_funcs (void);
 #endif
 
-static hb_font_funcs_t *
-_hb_ot_get_font_funcs (void)
+static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
 {
-retry:
-  hb_font_funcs_t *funcs = static_ot_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_font_funcs_t *create (void)
   {
-    funcs = hb_font_funcs_create ();
+    hb_font_funcs_t *funcs = hb_font_funcs_create ();
 
     hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
     hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
@@ -269,18 +255,26 @@ retry:
 
     hb_font_funcs_make_immutable (funcs);
 
-    if (unlikely (!static_ot_funcs.cmpexch (nullptr, funcs)))
-    {
-      hb_font_funcs_destroy (funcs);
-      goto retry;
-    }
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_ot_funcs);
+#endif
+
+    return funcs;
+  }
+} static_ot_funcs;
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
+static
+void free_static_ot_funcs (void)
+{
+  static_ot_funcs.free_instance ();
+}
 #endif
-  };
 
-  return funcs;
+static hb_font_funcs_t *
+_hb_ot_get_font_funcs (void)
+{
+  return static_ot_funcs.get_unconst ();
 }
 
 

src/hb-ot-layout-private.hh

@@ -205,7 +205,7 @@ struct hb_ot_layout_t
 
     hb_face_t *face; /* MUST be JUST before the lazy loaders. */
 #define HB_OT_LAYOUT_TABLE(Namespace, Type) \
-    hb_table_lazy_loader_t<HB_OT_LAYOUT_TABLE_ORDER (Namespace, Type), struct Namespace::Type> Type;
+    hb_table_lazy_loader_t<struct Namespace::Type, HB_OT_LAYOUT_TABLE_ORDER (Namespace, Type)> Type;
     HB_OT_LAYOUT_TABLES
 #undef HB_OT_LAYOUT_TABLE
   } table;

src/hb-private.hh

@@ -125,7 +125,20 @@ struct _hb_alignof
 #define alignof(x) (_hb_alignof<x>::value)
 #endif
 
-#endif // __cplusplus < 201103L
+/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
+#ifndef explicit_operator
+#define explicit_operator
+#endif
+
+#else /* __cplusplus >= 201103L */
+
+/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
+#ifndef explicit_operator
+#define explicit_operator explicit
+#endif
+
+#endif /* __cplusplus < 201103L */
+
 
 #if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
 #define likely(expr) (__builtin_expect (!!(expr), 1))

src/hb-shape.cc

@@ -32,6 +32,7 @@
 #include "hb-shape-plan-private.hh"
 #include "hb-buffer-private.hh"
 #include "hb-font-private.hh"
+#include "hb-machinery-private.hh"
 
 /**
  * SECTION:hb-shape
@@ -45,21 +46,52 @@
  * contains the output glyphs and their positions.
  **/
 
-static hb_atomic_ptr_t <const char **> static_shaper_list;
+#ifdef HB_USE_ATEXIT
+static void free_static_shaper_list (void);
+#endif
+
+static const char *nil_shaper_list[] = {nullptr};
+
+static struct hb_shaper_list_lazy_loader_t : hb_lazy_loader_t<const char *,
+							      hb_shaper_list_lazy_loader_t>
+{
+  static inline const char ** create (void)
+  {
+    const char **shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
+    if (unlikely (!shaper_list))
+      return nullptr;
+
+    const hb_shaper_pair_t *shapers = _hb_shapers_get ();
+    unsigned int i;
+    for (i = 0; i < HB_SHAPERS_COUNT; i++)
+      shaper_list[i] = shapers[i].name;
+    shaper_list[i] = nullptr;
+
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_shaper_list);
+#endif
+
+    return shaper_list;
+  }
+  static inline void destroy (const char **l)
+  {
+    free (l);
+  }
+  static inline const char ** get_null (void)
+  {
+    return nil_shaper_list;
+  }
+} static_shaper_list;
 
 #ifdef HB_USE_ATEXIT
 static
 void free_static_shaper_list (void)
 {
-retry:
-  const char **shaper_list = static_shaper_list.get ();
-  if (unlikely (!static_shaper_list.cmpexch (shaper_list, nullptr)))
-    goto retry;
-
-  free (shaper_list);
+  static_shaper_list.free_instance ();
 }
 #endif
 
+
 /**
  * hb_shape_list_shapers:
  *
@@ -73,36 +105,7 @@ retry:
 const char **
 hb_shape_list_shapers (void)
 {
-retry:
-  const char **shaper_list = static_shaper_list.get ();
-
-  if (unlikely (!shaper_list))
-  {
-    /* Not found; allocate one. */
-    shaper_list = (const char **) calloc (1 + HB_SHAPERS_COUNT, sizeof (const char *));
-    if (unlikely (!shaper_list)) {
-      static const char *nil_shaper_list[] = {nullptr};
-      return nil_shaper_list;
-    }
-
-    const hb_shaper_pair_t *shapers = _hb_shapers_get ();
-    unsigned int i;
-    for (i = 0; i < HB_SHAPERS_COUNT; i++)
-      shaper_list[i] = shapers[i].name;
-    shaper_list[i] = nullptr;
-
-    if (unlikely (!static_shaper_list.cmpexch (nullptr, shaper_list)))
-    {
-      free (shaper_list);
-      goto retry;
-    }
-
-#ifdef HB_USE_ATEXIT
-    atexit (free_static_shaper_list); /* First person registers atexit() callback. */
-#endif
-  }
-
-  return shaper_list;
+  return static_shaper_list.get_unconst ();
 }
 
 

src/hb-shaper.cc

@@ -26,7 +26,7 @@
 
 #include "hb-private.hh"
 #include "hb-shaper-private.hh"
-#include "hb-atomic-private.hh"
+#include "hb-machinery-private.hh"
 
 
 static const hb_shaper_pair_t all_shapers[] = {
@@ -35,53 +35,30 @@ static const hb_shaper_pair_t all_shapers[] = {
 #undef HB_SHAPER_IMPLEMENT
 };
 
-
-/* Thread-safe, lock-free, shapers */
-
-static hb_atomic_ptr_t<const hb_shaper_pair_t> static_shapers;
-
 #ifdef HB_USE_ATEXIT
-static
-void free_static_shapers (void)
-{
-retry:
-  const hb_shaper_pair_t *shapers = static_shapers.get ();
-  if (unlikely (!static_shapers.cmpexch (shapers, nullptr)))
-    goto retry;
-
-  if (unlikely (shapers != all_shapers))
-    free ((void *) shapers);
-}
+static void free_static_shapers (void);
 #endif
 
-const hb_shaper_pair_t *
-_hb_shapers_get (void)
+static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_pair_t,
+							  hb_shapers_lazy_loader_t>
 {
-retry:
-  hb_shaper_pair_t *shapers = const_cast<hb_shaper_pair_t *> (static_shapers.get ());
-
-  if (unlikely (!shapers))
+  static inline hb_shaper_pair_t *create (void)
   {
     char *env = getenv ("HB_SHAPER_LIST");
-    if (!env || !*env) {
-      (void) static_shapers.cmpexch (nullptr, &all_shapers[0]);
-      return (const hb_shaper_pair_t *) all_shapers;
-    }
+    if (!env || !*env)
+      return nullptr;
 
-    /* Not found; allocate one. */
-    shapers = (hb_shaper_pair_t *) calloc (1, sizeof (all_shapers));
+    hb_shaper_pair_t *shapers = (hb_shaper_pair_t *) calloc (1, sizeof (all_shapers));
     if (unlikely (!shapers))
-    {
-      (void) static_shapers.cmpexch (nullptr, &all_shapers[0]);
-      return (const hb_shaper_pair_t *) all_shapers;
-    }
+      return nullptr;
 
     memcpy (shapers, all_shapers, sizeof (all_shapers));
 
      /* Reorder shaper list to prefer requested shapers. */
     unsigned int i = 0;
     char *end, *p = env;
-    for (;;) {
+    for (;;)
+    {
       end = strchr (p, ',');
       if (!end)
 	end = p + strlen (p);
@@ -103,16 +80,32 @@ retry:
 	p = end + 1;
     }
 
-    if (unlikely (!static_shapers.cmpexch (nullptr, shapers)))
-    {
-      free (shapers);
-      goto retry;
-    }
-
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_shapers); /* First person registers atexit() callback. */
+    atexit (free_static_shapers);
 #endif
+
+    return shapers;
+  }
+  static inline void destroy (const hb_shaper_pair_t *p)
+  {
+    free ((void *) p);
   }
+  static inline const hb_shaper_pair_t *get_null (void)
+  {
+    return all_shapers;
+  }
+} static_shapers;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_shapers (void)
+{
+  static_shapers.free_instance ();
+}
+#endif
 
-  return shapers;
+const hb_shaper_pair_t *
+_hb_shapers_get (void)
+{
+  return static_shapers.get_unconst ();
 }

src/hb-ucdn.cc

@@ -17,6 +17,7 @@
 #include "hb-private.hh"
 
 #include "hb-unicode-private.hh"
+#include "hb-machinery-private.hh"
 
 #include "ucdn.h"
 
@@ -238,31 +239,14 @@ hb_ucdn_decompose_compatibility(hb_unicode_funcs_t *ufuncs HB_UNUSED,
     return ucdn_compat_decompose(u, decomposed);
 }
 
-static hb_atomic_ptr_t<hb_unicode_funcs_t> static_ucdn_funcs;
 
-#ifdef HB_USE_ATEXIT
-static
-void free_static_ucdn_funcs (void)
-{
-retry:
-  hb_unicode_funcs_t *ucdn_funcs = static_ucdn_funcs.get ();
-  if (unlikely (!static_ucdn_funcs.cmpexch (ucdn_funcs, nullptr)))
-    goto retry;
+static void free_static_ucdn_funcs (void);
 
-  hb_unicode_funcs_destroy (ucdn_funcs);
-}
-#endif
-
-extern "C" HB_INTERNAL
-hb_unicode_funcs_t *
-hb_ucdn_get_unicode_funcs (void)
+static struct hb_ucdn_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_ucdn_unicode_funcs_lazy_loader_t>
 {
-retry:
-  hb_unicode_funcs_t *funcs = static_ucdn_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_unicode_funcs_t *create (void)
   {
-    funcs = hb_unicode_funcs_create (nullptr);
+    hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
 
 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
     hb_unicode_funcs_set_##name##_func (funcs, hb_ucdn_##name, nullptr, nullptr);
@@ -271,16 +255,25 @@ retry:
 
     hb_unicode_funcs_make_immutable (funcs);
 
-    if (unlikely (!static_ucdn_funcs.cmpexch (nullptr, funcs)))
-    {
-      hb_unicode_funcs_destroy (funcs);
-      goto retry;
-    }
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_ucdn_funcs);
+#endif
+
+    return funcs;
+  }
+} static_ucdn_funcs;
 
 #ifdef HB_USE_ATEXIT
-    atexit (free_static_ucdn_funcs); /* First person registers atexit() callback. */
+static
+void free_static_ucdn_funcs (void)
+{
+  static_ucdn_funcs.free_instance ();
+}
 #endif
-  };
 
-  return hb_unicode_funcs_reference (funcs);
+extern "C" HB_INTERNAL
+hb_unicode_funcs_t *
+hb_ucdn_get_unicode_funcs (void)
+{
+  return static_ucdn_funcs.get_unconst ();
 }

src/hb-uniscribe.cc

@@ -190,7 +190,8 @@ hb_ScriptPlaceOpenType(
 }
 
 
-struct hb_uniscribe_shaper_funcs_t {
+struct hb_uniscribe_shaper_funcs_t
+{
   SIOT ScriptItemizeOpenType;
   SSOT ScriptShapeOpenType;
   SPOT ScriptPlaceOpenType;
@@ -220,47 +221,49 @@ struct hb_uniscribe_shaper_funcs_t {
     }
   }
 };
-static hb_atomic_ptr_t<hb_uniscribe_shaper_funcs_t> uniscribe_funcs;
 
-#ifdef HB_USE_ATEXIT
-static inline void
-free_uniscribe_funcs (void)
-{
-retry:
-  hb_uniscribe_shaper_funcs_t *local_uniscribe_funcs = uniscribe_funcs.get ();
-  if (unlikely (!uniscribe_funcs.cmpexch (local_uniscribe_funcs, nullptr)))
-    goto retry;
 
-  free (local_uniscribe_funcs);
-}
-#endif
+static void free_static_uniscribe_shaper_funcs (void);
 
-static hb_uniscribe_shaper_funcs_t *
-hb_uniscribe_shaper_get_funcs (void)
+static struct hb_uniscribe_shaper_funcs_lazy_loader_t : hb_lazy_loader_t<hb_uniscribe_shaper_funcs_t,
+									 hb_uniscribe_shaper_funcs_lazy_loader_t>
 {
-retry:
-  hb_uniscribe_shaper_funcs_t *funcs = uniscribe_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_uniscribe_shaper_funcs_t *create (void)
   {
-    funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
+    hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
     if (unlikely (!funcs))
       return nullptr;
 
     funcs->init ();
 
-    if (unlikely (!uniscribe_funcs.cmpexch (nullptr, funcs)))
-    {
-      free (funcs);
-      goto retry;
-    }
-
 #ifdef HB_USE_ATEXIT
-    atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
+    atexit (free_static_uniscribe_shaper_funcs);
 #endif
+
+    return funcs;
+  }
+  static inline void destroy (hb_uniscribe_shaper_funcs_t *p)
+  {
+    free ((void *) p);
   }
+  static inline hb_uniscribe_shaper_funcs_t *get_null (void)
+  {
+    return nullptr;
+  }
+} static_uniscribe_shaper_funcs;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_uniscribe_shaper_funcs (void)
+{
+  static_uniscribe_shaper_funcs.free_instance ();
+}
+#endif
 
-  return funcs;
+static hb_uniscribe_shaper_funcs_t *
+hb_uniscribe_shaper_get_funcs (void)
+{
+  return static_uniscribe_shaper_funcs.get_unconst ();
 }
 
 

src/hb-version.h

@@ -38,9 +38,9 @@ HB_BEGIN_DECLS
 
 #define HB_VERSION_MAJOR 1
 #define HB_VERSION_MINOR 8
-#define HB_VERSION_MICRO 7
+#define HB_VERSION_MICRO 8
 
-#define HB_VERSION_STRING "1.8.7"
+#define HB_VERSION_STRING "1.8.8"
 
 #define HB_VERSION_ATLEAST(major,minor,micro) \
 	((major)*10000+(minor)*100+(micro) <= \