[glib/icu/ucdn] Make the funcs object allocated on demand
diff --git a/src/hb-ucdn.cc b/src/hb-ucdn.cc
index c237ee8..e51f035 100644
--- a/src/hb-ucdn.cc
+++ b/src/hb-ucdn.cc
@@ -231,22 +231,43 @@
return ucdn_compat_decompose(u, decomposed);
}
+static hb_unicode_funcs_t *static_ucdn_funcs = nullptr;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_ucdn_funcs (void)
+{
+ hb_unicode_funcs_destroy (static_ucdn_funcs);
+}
+#endif
+
extern "C" HB_INTERNAL
hb_unicode_funcs_t *
hb_ucdn_get_unicode_funcs (void)
{
- static const hb_unicode_funcs_t _hb_ucdn_unicode_funcs = {
- HB_OBJECT_HEADER_STATIC,
+retry:
+ hb_unicode_funcs_t *funcs = (hb_unicode_funcs_t *) hb_atomic_ptr_get (&static_ucdn_funcs);
- nullptr, /* parent */
- true, /* immutable */
- {
-#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_ucdn_##name,
+ if (unlikely (!funcs))
+ {
+ funcs = hb_unicode_funcs_create (nullptr);
+
+#define HB_UNICODE_FUNC_IMPLEMENT(name) \
+ hb_unicode_funcs_set_##name##_func (funcs, hb_ucdn_##name, nullptr, nullptr);
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
+
+ hb_unicode_funcs_make_immutable (funcs);
+
+ if (!hb_atomic_ptr_cmpexch (&static_ucdn_funcs, nullptr, funcs)) {
+ hb_unicode_funcs_destroy (funcs);
+ goto retry;
}
+
+#ifdef HB_USE_ATEXIT
+ atexit (free_static_ucdn_funcs); /* First person registers atexit() callback. */
+#endif
};
- return const_cast<hb_unicode_funcs_t *> (&_hb_ucdn_unicode_funcs);
+ return funcs;
}
-
