summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh')
-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh185
1 files changed, 0 insertions, 185 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh
deleted file mode 100644
index d09f858cde3..00000000000
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-null.hh
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * Copyright © 2018 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_NULL_HH
-#define HB_NULL_HH
-
-#include "hb.hh"
-#include "hb-meta.hh"
-
-
-/*
- * Static pools
- */
-
-/* Global nul-content Null pool. Enlarge as necessary. */
-
-#define HB_NULL_POOL_SIZE 384
-
-/* Use SFINAE to sniff whether T has min_size; in which case return T::null_size,
- * otherwise return sizeof(T). */
-
-/* The hard way...
- * https://stackoverflow.com/questions/7776448/sfinae-tried-with-bool-gives-compiler-error-template-argument-tvalue-invol
- */
-
-template <typename T, typename>
-struct _hb_null_size : hb_integral_constant<unsigned, sizeof (T)> {};
-template <typename T>
-struct _hb_null_size<T, hb_void_t<decltype (T::min_size)>> : hb_integral_constant<unsigned, T::null_size> {};
-
-template <typename T>
-using hb_null_size = _hb_null_size<T, void>;
-#define hb_null_size(T) hb_null_size<T>::value
-
-/* These doesn't belong here, but since is copy/paste from above, put it here. */
-
-/* hb_static_size (T)
- * Returns T::static_size if T::min_size is defined, or sizeof (T) otherwise. */
-
-template <typename T, typename>
-struct _hb_static_size : hb_integral_constant<unsigned, sizeof (T)> {};
-template <typename T>
-struct _hb_static_size<T, hb_void_t<decltype (T::min_size)>> : hb_integral_constant<unsigned, T::static_size> {};
-template <typename T>
-using hb_static_size = _hb_static_size<T, void>;
-#define hb_static_size(T) hb_static_size<T>::value
-
-
-/*
- * Null()
- */
-
-extern HB_INTERNAL
-uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)];
-
-/* Generic nul-content Null objects. */
-template <typename Type>
-struct Null {
- static Type const & get_null ()
- {
- static_assert (hb_null_size (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE.");
- return *reinterpret_cast<Type const *> (_hb_NullPool);
- }
-};
-template <typename QType>
-struct NullHelper
-{
- typedef hb_remove_const<hb_remove_reference<QType>> Type;
- static const Type & get_null () { return Null<Type>::get_null (); }
-};
-#define Null(Type) NullHelper<Type>::get_null ()
-
-/* Specializations for arbitrary-content Null objects expressed in bytes. */
-#define DECLARE_NULL_NAMESPACE_BYTES(Namespace, Type) \
- } /* Close namespace. */ \
- extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[Namespace::Type::null_size]; \
- template <> \
- struct Null<Namespace::Type> { \
- static Namespace::Type const & get_null () { \
- return *reinterpret_cast<const Namespace::Type *> (_hb_Null_##Namespace##_##Type); \
- } \
- }; \
- namespace Namespace { \
- static_assert (true, "") /* Require semicolon after. */
-#define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \
- const unsigned char _hb_Null_##Namespace##_##Type[Namespace::Type::null_size]
-
-/* Specializations for arbitrary-content Null objects expressed as struct initializer. */
-#define DECLARE_NULL_INSTANCE(Type) \
- extern HB_INTERNAL const Type _hb_Null_##Type; \
- template <> \
- struct Null<Type> { \
- static Type const & get_null () { \
- return _hb_Null_##Type; \
- } \
- }; \
- static_assert (true, "") /* Require semicolon after. */
-#define DEFINE_NULL_INSTANCE(Type) \
- const Type _hb_Null_##Type
-
-/* Global writable pool. Enlarge as necessary. */
-
-/* To be fully correct, CrapPool must be thread_local. However, we do not rely on CrapPool
- * for correct operation. It only exist to catch and divert program logic bugs instead of
- * causing bad memory access. So, races there are not actually introducing incorrectness
- * in the code. Has ~12kb binary size overhead to have it, also clang build fails with it. */
-extern HB_INTERNAL
-/*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)];
-
-/* CRAP pool: Common Region for Access Protection. */
-template <typename Type>
-static inline Type& Crap () {
- static_assert (hb_null_size (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE.");
- Type *obj = reinterpret_cast<Type *> (_hb_CrapPool);
- memcpy (obj, &Null (Type), sizeof (*obj));
- return *obj;
-}
-template <typename QType>
-struct CrapHelper
-{
- typedef hb_remove_const<hb_remove_reference<QType>> Type;
- static Type & get_crap () { return Crap<Type> (); }
-};
-#define Crap(Type) CrapHelper<Type>::get_crap ()
-
-template <typename Type>
-struct CrapOrNullHelper {
- static Type & get () { return Crap (Type); }
-};
-template <typename Type>
-struct CrapOrNullHelper<const Type> {
- static const Type & get () { return Null (Type); }
-};
-#define CrapOrNull(Type) CrapOrNullHelper<Type>::get ()
-
-
-/*
- * hb_nonnull_ptr_t
- */
-
-template <typename P>
-struct hb_nonnull_ptr_t
-{
- typedef hb_remove_pointer<P> T;
-
- hb_nonnull_ptr_t (T *v_ = nullptr) : v (v_) {}
- T * operator = (T *v_) { return v = v_; }
- T * operator -> () const { return get (); }
- T & operator * () const { return *get (); }
- T ** operator & () const { return &v; }
- /* Only auto-cast to const types. */
- template <typename C> operator const C * () const { return get (); }
- operator const char * () const { return (const char *) get (); }
- T * get () const { return v ? v : const_cast<T *> (&Null (T)); }
- T * get_raw () const { return v; }
-
- private:
- T *v;
-};
-
-
-#endif /* HB_NULL_HH */