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+/*
+ * Copyright © 2007 Chris Wilson
+ * Copyright © 2009,2010 Red Hat, Inc.
+ * Copyright © 2011,2012 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.
+ *
+ * Contributor(s):
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_ATOMIC_HH
+#define HB_ATOMIC_HH
+
+#include "hb.hh"
+#include "hb-meta.hh"
+
+
+/*
+ * Atomic integers and pointers.
+ */
+
+
+/* We need external help for these */
+
+#if defined(hb_atomic_int_impl_add) \
+ && defined(hb_atomic_ptr_impl_get) \
+ && defined(hb_atomic_ptr_impl_cmpexch)
+
+/* Defined externally, i.e. in config.h. */
+
+
+#elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE)
+
+/* C++11-style GCC primitives. We prefer these as they don't require linking to libstdc++ / libc++. */
+
+#define _hb_memory_barrier() __sync_synchronize ()
+
+#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL)
+#define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED)
+#define hb_atomic_int_impl_set(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELEASE)
+#define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED)
+#define hb_atomic_int_impl_get(AI) __atomic_load_n ((AI), __ATOMIC_ACQUIRE)
+
+#define hb_atomic_ptr_impl_set_relaxed(P, V) __atomic_store_n ((P), (V), __ATOMIC_RELAXED)
+#define hb_atomic_ptr_impl_get_relaxed(P) __atomic_load_n ((P), __ATOMIC_RELAXED)
+#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE)
+static inline bool
+_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
+{
+ const void *O = O_; // Need lvalue
+ return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
+}
+#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
+
+
+#elif !defined(HB_NO_MT)
+
+/* C++11 atomics. */
+
+#include <atomic>
+
+#define _hb_memory_barrier() std::atomic_thread_fence(std::memory_order_ack_rel)
+#define _hb_memory_r_barrier() std::atomic_thread_fence(std::memory_order_acquire)
+#define _hb_memory_w_barrier() std::atomic_thread_fence(std::memory_order_release)
+
+#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> *> (AI)->fetch_add ((V), std::memory_order_acq_rel))
+#define hb_atomic_int_impl_set_relaxed(AI, V) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> *> (AI)->store ((V), std::memory_order_relaxed))
+#define hb_atomic_int_impl_set(AI, V) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> *> (AI)->store ((V), std::memory_order_release))
+#define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> const *> (AI)->load (std::memory_order_relaxed))
+#define hb_atomic_int_impl_get(AI) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> const *> (AI)->load (std::memory_order_acquire))
+
+#define hb_atomic_ptr_impl_set_relaxed(P, V) (reinterpret_cast<std::atomic<void*> *> (P)->store ((V), std::memory_order_relaxed))
+#define hb_atomic_ptr_impl_get_relaxed(P) (reinterpret_cast<std::atomic<void*> const *> (P)->load (std::memory_order_relaxed))
+#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire))
+static inline bool
+_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
+{
+ const void *O = O_; // Need lvalue
+ return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
+}
+#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
+
+
+#else /* defined(HB_NO_MT) */
+
+#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
+#define _hb_memory_barrier() do {} while (0)
+#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
+
+#endif
+
+
+/* This should never be disabled, even under HB_NO_MT.
+ * except that MSVC gives me an internal compiler error, so disabled there.
+ *
+ * https://github.com/harfbuzz/harfbuzz/pull/4119
+ */
+#ifndef _hb_compiler_memory_r_barrier
+#if defined(__ATOMIC_ACQUIRE) // gcc-like
+#define _hb_compiler_memory_r_barrier() asm volatile("": : :"memory")
+#elif !defined(_MSC_VER)
+#include <atomic>
+#define _hb_compiler_memory_r_barrier() std::atomic_signal_fence (std::memory_order_acquire)
+#else
+#define _hb_compiler_memory_r_barrier() do {} while (0)
+#endif
+#endif
+
+
+
+#ifndef _hb_memory_r_barrier
+#define _hb_memory_r_barrier() _hb_memory_barrier ()
+#endif
+#ifndef _hb_memory_w_barrier
+#define _hb_memory_w_barrier() _hb_memory_barrier ()
+#endif
+#ifndef hb_atomic_int_impl_set_relaxed
+#define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V))
+#endif
+#ifndef hb_atomic_int_impl_get_relaxed
+#define hb_atomic_int_impl_get_relaxed(AI) (*(AI))
+#endif
+
+#ifndef hb_atomic_ptr_impl_set_relaxed
+#define hb_atomic_ptr_impl_set_relaxed(P, V) (*(P) = (V))
+#endif
+#ifndef hb_atomic_ptr_impl_get_relaxed
+#define hb_atomic_ptr_impl_get_relaxed(P) (*(P))
+#endif
+#ifndef hb_atomic_int_impl_set
+inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; }
+inline void hb_atomic_int_impl_set (short *AI, short v) { _hb_memory_w_barrier (); *AI = v; }
+#endif
+#ifndef hb_atomic_int_impl_get
+inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; }
+inline short hb_atomic_int_impl_get (const short *AI) { short v = *AI; _hb_memory_r_barrier (); return v; }
+#endif
+#ifndef hb_atomic_ptr_impl_get
+inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; }
+#endif
+
+
+struct hb_atomic_short_t
+{
+ hb_atomic_short_t () = default;
+ constexpr hb_atomic_short_t (short v) : v (v) {}
+
+ hb_atomic_short_t& operator = (short v_) { set_relaxed (v_); return *this; }
+ operator short () const { return get_relaxed (); }
+
+ void set_relaxed (short v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
+ void set_release (short v_) { hb_atomic_int_impl_set (&v, v_); }
+ short get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); }
+ short get_acquire () const { return hb_atomic_int_impl_get (&v); }
+ short inc () { return hb_atomic_int_impl_add (&v, 1); }
+ short dec () { return hb_atomic_int_impl_add (&v, -1); }
+
+ short v = 0;
+};
+
+struct hb_atomic_int_t
+{
+ hb_atomic_int_t () = default;
+ constexpr hb_atomic_int_t (int v) : v (v) {}
+
+ hb_atomic_int_t& operator = (int v_) { set_relaxed (v_); return *this; }
+ operator int () const { return get_relaxed (); }
+
+ void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); }
+ void set_release (int v_) { hb_atomic_int_impl_set (&v, v_); }
+ int get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); }
+ int get_acquire () const { return hb_atomic_int_impl_get (&v); }
+ int inc () { return hb_atomic_int_impl_add (&v, 1); }
+ int dec () { return hb_atomic_int_impl_add (&v, -1); }
+
+ int v = 0;
+};
+
+template <typename P>
+struct hb_atomic_ptr_t
+{
+ typedef hb_remove_pointer<P> T;
+
+ hb_atomic_ptr_t () = default;
+ constexpr hb_atomic_ptr_t (T* v) : v (v) {}
+
+ void init (T* v_ = nullptr) { set_relaxed (v_); }
+ void set_relaxed (T* v_) { hb_atomic_ptr_impl_set_relaxed (&v, v_); }
+ T *get_relaxed () const { return (T *) hb_atomic_ptr_impl_get_relaxed (&v); }
+ T *get_acquire () const { return (T *) hb_atomic_ptr_impl_get ((void **) &v); }
+ bool cmpexch (const T *old, T *new_) const { return hb_atomic_ptr_impl_cmpexch ((void **) &v, (void *) old, (void *) new_); }
+
+ T * operator -> () const { return get_acquire (); }
+ template <typename C> operator C * () const { return get_acquire (); }
+
+ T *v = nullptr;
+};
+
+
+#endif /* HB_ATOMIC_HH */