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-/*
- * Copyright © 2007,2008,2009,2010 Red Hat, Inc.
- * Copyright © 2012,2018 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.
- *
- * Red Hat Author(s): Behdad Esfahbod
- * Google Author(s): Behdad Esfahbod
- */
-
-#ifndef HB_MACHINERY_HH
-#define HB_MACHINERY_HH
-
-#include "hb.hh"
-#include "hb-blob.hh"
-
-#include "hb-dispatch.hh"
-#include "hb-sanitize.hh"
-#include "hb-serialize.hh"
-
-
-/*
- * Casts
- */
-
-/* StructAtOffset<T>(P,Ofs) returns the struct T& that is placed at memory
- * location pointed to by P plus Ofs bytes. */
-template<typename Type>
-static inline const Type& StructAtOffset(const void *P, unsigned int offset)
-{ return * reinterpret_cast<const Type*> ((const char *) P + offset); }
-template<typename Type>
-static inline Type& StructAtOffset(void *P, unsigned int offset)
-{ return * reinterpret_cast<Type*> ((char *) P + offset); }
-template<typename Type>
-static inline const Type& StructAtOffsetUnaligned(const void *P, unsigned int offset)
-{
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-align"
- return * reinterpret_cast<const Type*> ((const char *) P + offset);
-#pragma GCC diagnostic pop
-}
-template<typename Type>
-static inline Type& StructAtOffsetUnaligned(void *P, unsigned int offset)
-{
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-align"
- return * reinterpret_cast<Type*> ((char *) P + offset);
-#pragma GCC diagnostic pop
-}
-
-/* StructAfter<T>(X) returns the struct T& that is placed after X.
- * Works with X of variable size also. X must implement get_size() */
-template<typename Type, typename TObject>
-static inline const Type& StructAfter(const TObject &X)
-{ return StructAtOffset<Type>(&X, X.get_size()); }
-template<typename Type, typename TObject>
-static inline Type& StructAfter(TObject &X)
-{ return StructAtOffset<Type>(&X, X.get_size()); }
-
-
-/*
- * Size checking
- */
-
-/* Check _assertion in a method environment */
-#define _DEFINE_INSTANCE_ASSERTION1(_line, _assertion) \
- void _instance_assertion_on_line_##_line () const \
- { static_assert ((_assertion), ""); }
-# define _DEFINE_INSTANCE_ASSERTION0(_line, _assertion) _DEFINE_INSTANCE_ASSERTION1 (_line, _assertion)
-# define DEFINE_INSTANCE_ASSERTION(_assertion) _DEFINE_INSTANCE_ASSERTION0 (__LINE__, _assertion)
-
-/* Check that _code compiles in a method environment */
-#define _DEFINE_COMPILES_ASSERTION1(_line, _code) \
- void _compiles_assertion_on_line_##_line () const \
- { _code; }
-# define _DEFINE_COMPILES_ASSERTION0(_line, _code) _DEFINE_COMPILES_ASSERTION1 (_line, _code)
-# define DEFINE_COMPILES_ASSERTION(_code) _DEFINE_COMPILES_ASSERTION0 (__LINE__, _code)
-
-
-#define DEFINE_SIZE_STATIC(size) \
- DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size)) \
- unsigned int get_size () const { return (size); } \
- static constexpr unsigned null_size = (size); \
- static constexpr unsigned min_size = (size); \
- static constexpr unsigned static_size = (size)
-
-#define DEFINE_SIZE_UNION(size, _member) \
- DEFINE_COMPILES_ASSERTION ((void) this->u._member.static_size) \
- DEFINE_INSTANCE_ASSERTION (sizeof(this->u._member) == (size)) \
- static constexpr unsigned null_size = (size); \
- static constexpr unsigned min_size = (size)
-
-#define DEFINE_SIZE_MIN(size) \
- DEFINE_INSTANCE_ASSERTION (sizeof (*this) >= (size)) \
- static constexpr unsigned null_size = (size); \
- static constexpr unsigned min_size = (size)
-
-#define DEFINE_SIZE_UNBOUNDED(size) \
- DEFINE_INSTANCE_ASSERTION (sizeof (*this) >= (size)) \
- static constexpr unsigned min_size = (size)
-
-#define DEFINE_SIZE_ARRAY(size, array) \
- DEFINE_COMPILES_ASSERTION ((void) (array)[0].static_size) \
- DEFINE_INSTANCE_ASSERTION (sizeof (*this) == (size) + (HB_VAR_ARRAY+0) * sizeof ((array)[0])) \
- static constexpr unsigned null_size = (size); \
- static constexpr unsigned min_size = (size)
-
-#define DEFINE_SIZE_ARRAY_SIZED(size, array) \
- unsigned int get_size () const { return (size - (array).min_size + (array).get_size ()); } \
- DEFINE_SIZE_ARRAY(size, array)
-
-
-
-/*
- * Lazy loaders.
- */
-
-template <typename Data, unsigned int WheresData>
-struct hb_data_wrapper_t
-{
- static_assert (WheresData > 0, "");
-
- Data * get_data () const
- { return *(((Data **) (void *) this) - WheresData); }
-
- bool is_inert () const { return !get_data (); }
-
- template <typename Stored, typename Subclass>
- Stored * call_create () const { return Subclass::create (get_data ()); }
-};
-template <>
-struct hb_data_wrapper_t<void, 0>
-{
- bool is_inert () const { return false; }
-
- template <typename Stored, typename Funcs>
- Stored * call_create () 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;
-
- void init0 () {} /* Init, when memory is already set to 0. No-op for us. */
- void init () { instance.set_relaxed (nullptr); }
- void fini () { do_destroy (instance.get ()); }
-
- void free_instance ()
- {
- retry:
- Stored *p = instance.get ();
- if (unlikely (p && !cmpexch (p, nullptr)))
- goto retry;
- do_destroy (p);
- }
-
- static void do_destroy (Stored *p)
- {
- if (p && p != const_cast<Stored *> (Funcs::get_null ()))
- Funcs::destroy (p);
- }
-
- const Returned * operator -> () const { return get (); }
- const Returned & operator * () const { return *get (); }
- explicit operator bool () const
- { return get_stored () != Funcs::get_null (); }
- template <typename C> operator const C * () const { return get (); }
-
- Stored * get_stored () const
- {
- retry:
- Stored *p = this->instance.get ();
- if (unlikely (!p))
- {
- if (unlikely (this->is_inert ()))
- return const_cast<Stored *> (Funcs::get_null ());
-
- p = this->template call_create<Stored, Funcs> ();
- if (unlikely (!p))
- p = const_cast<Stored *> (Funcs::get_null ());
-
- if (unlikely (!cmpexch (nullptr, p)))
- {
- do_destroy (p);
- goto retry;
- }
- }
- return p;
- }
- Stored * get_stored_relaxed () const
- {
- return this->instance.get_relaxed ();
- }
-
- bool cmpexch (Stored *current, Stored *value) const
- {
- /* This *must* be called when there are no other threads accessing. */
- return this->instance.cmpexch (current, value);
- }
-
- const Returned * get () const { return Funcs::convert (get_stored ()); }
- const Returned * get_relaxed () const { return Funcs::convert (get_stored_relaxed ()); }
- Returned * get_unconst () const { return const_cast<Returned *> (Funcs::convert (get_stored ())); }
-
- /* To be possibly overloaded by subclasses. */
- static Returned* convert (Stored *p) { return p; }
-
- /* By default null/init/fini the object. */
- static const Stored* get_null () { return &Null (Stored); }
- static Stored *create (Data *data)
- {
- Stored *p = (Stored *) calloc (1, sizeof (Stored));
- if (likely (p))
- p->init (data);
- return p;
- }
- static Stored *create ()
- {
- Stored *p = (Stored *) calloc (1, sizeof (Stored));
- if (likely (p))
- p->init ();
- return p;
- }
- static void destroy (Stored *p)
- {
- p->fini ();
- free (p);
- }
-
-// private:
- /* Must only have one pointer. */
- hb_atomic_ptr_t<Stored *> instance;
-};
-
-/* Specializations. */
-
-template <typename T, unsigned int WheresFace>
-struct hb_face_lazy_loader_t : hb_lazy_loader_t<T,
- hb_face_lazy_loader_t<T, WheresFace>,
- 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 hb_blob_t *create (hb_face_t *face)
- { return hb_sanitize_context_t ().reference_table<T> (face); }
- static void destroy (hb_blob_t *p) { hb_blob_destroy (p); }
-
- static const hb_blob_t *get_null ()
- { return hb_blob_get_empty (); }
-
- static const T* convert (const hb_blob_t *blob)
- { return blob->as<T> (); }
-
- hb_blob_t* get_blob () const { return this->get_stored (); }
-};
-
-template <typename Subclass>
-struct hb_font_funcs_lazy_loader_t : hb_lazy_loader_t<hb_font_funcs_t, Subclass>
-{
- static void destroy (hb_font_funcs_t *p)
- { hb_font_funcs_destroy (p); }
- static const hb_font_funcs_t *get_null ()
- { 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 void destroy (hb_unicode_funcs_t *p)
- { hb_unicode_funcs_destroy (p); }
- static const hb_unicode_funcs_t *get_null ()
- { return hb_unicode_funcs_get_empty (); }
-};
-
-
-#endif /* HB_MACHINERY_HH */