HarfBuzz text shaping engine
http://harfbuzz.github.io/
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221 lines
8.6 KiB
221 lines
8.6 KiB
/* |
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* Copyright © 2007 Chris Wilson |
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* Copyright © 2009,2010 Red Hat, Inc. |
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* Copyright © 2011,2012 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Contributor(s): |
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* Chris Wilson <chris@chris-wilson.co.uk> |
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* Red Hat Author(s): Behdad Esfahbod |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_ATOMIC_HH |
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#define HB_ATOMIC_HH |
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#include "hb.hh" |
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#include "hb-meta.hh" |
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/* |
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* Atomic integers and pointers. |
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*/ |
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/* We need external help for these */ |
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#if defined(hb_atomic_int_impl_add) \ |
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&& defined(hb_atomic_ptr_impl_get) \ |
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&& defined(hb_atomic_ptr_impl_cmpexch) |
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/* Defined externally, i.e. in config.h. */ |
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#elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE) |
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/* C++11-style GCC primitives. We prefer these as they don't require linking to libstdc++ / libc++. */ |
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#define _hb_memory_barrier() __sync_synchronize () |
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#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add ((AI), (V), __ATOMIC_ACQ_REL) |
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#define hb_atomic_int_impl_set_relaxed(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELAXED) |
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#define hb_atomic_int_impl_set(AI, V) __atomic_store_n ((AI), (V), __ATOMIC_RELEASE) |
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#define hb_atomic_int_impl_get_relaxed(AI) __atomic_load_n ((AI), __ATOMIC_RELAXED) |
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#define hb_atomic_int_impl_get(AI) __atomic_load_n ((AI), __ATOMIC_ACQUIRE) |
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#define hb_atomic_ptr_impl_set_relaxed(P, V) __atomic_store_n ((P), (V), __ATOMIC_RELAXED) |
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#define hb_atomic_ptr_impl_get_relaxed(P) __atomic_load_n ((P), __ATOMIC_RELAXED) |
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#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE) |
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static inline bool |
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_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N) |
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{ |
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const void *O = O_; // Need lvalue |
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return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED); |
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} |
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)) |
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#elif !defined(HB_NO_MT) |
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/* C++11 atomics. */ |
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#include <atomic> |
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#define _hb_memory_barrier() std::atomic_thread_fence(std::memory_order_ack_rel) |
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#define _hb_memory_r_barrier() std::atomic_thread_fence(std::memory_order_acquire) |
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#define _hb_memory_w_barrier() std::atomic_thread_fence(std::memory_order_release) |
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#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)) |
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#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)) |
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#define hb_atomic_int_impl_set(AI, V) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> *> (AI)->store ((V), std::memory_order_release)) |
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#define hb_atomic_int_impl_get_relaxed(AI) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> const *> (AI)->load (std::memory_order_relaxed)) |
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#define hb_atomic_int_impl_get(AI) (reinterpret_cast<std::atomic<std::decay<decltype (*(AI))>::type> const *> (AI)->load (std::memory_order_acquire)) |
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#define hb_atomic_ptr_impl_set_relaxed(P, V) (reinterpret_cast<std::atomic<void*> *> (P)->store ((V), std::memory_order_relaxed)) |
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#define hb_atomic_ptr_impl_get_relaxed(P) (reinterpret_cast<std::atomic<void*> const *> (P)->load (std::memory_order_relaxed)) |
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#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire)) |
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static inline bool |
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_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N) |
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{ |
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const void *O = O_; // Need lvalue |
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return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed); |
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} |
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)) |
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#else /* defined(HB_NO_MT) */ |
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#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V)) |
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#define _hb_memory_barrier() do {} while (0) |
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#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false) |
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#endif |
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/* This should never be disabled, even under HB_NO_MT. |
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* except that MSVC gives me an internal compiler error, so disabled there. |
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* |
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* https://github.com/harfbuzz/harfbuzz/pull/4119 |
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*/ |
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#ifndef _hb_compiler_memory_r_barrier |
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#if defined(__ATOMIC_ACQUIRE) // gcc-like |
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#define _hb_compiler_memory_r_barrier() asm volatile("": : :"memory") |
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#elif !defined(_MSC_VER) |
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#include <atomic> |
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#define _hb_compiler_memory_r_barrier() std::atomic_signal_fence (std::memory_order_acquire) |
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#else |
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#define _hb_compiler_memory_r_barrier() do {} while (0) |
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#endif |
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#endif |
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#ifndef _hb_memory_r_barrier |
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#define _hb_memory_r_barrier() _hb_memory_barrier () |
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#endif |
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#ifndef _hb_memory_w_barrier |
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#define _hb_memory_w_barrier() _hb_memory_barrier () |
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#endif |
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#ifndef hb_atomic_int_impl_set_relaxed |
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#define hb_atomic_int_impl_set_relaxed(AI, V) (*(AI) = (V)) |
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#endif |
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#ifndef hb_atomic_int_impl_get_relaxed |
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#define hb_atomic_int_impl_get_relaxed(AI) (*(AI)) |
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#endif |
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#ifndef hb_atomic_ptr_impl_set_relaxed |
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#define hb_atomic_ptr_impl_set_relaxed(P, V) (*(P) = (V)) |
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#endif |
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#ifndef hb_atomic_ptr_impl_get_relaxed |
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#define hb_atomic_ptr_impl_get_relaxed(P) (*(P)) |
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#endif |
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#ifndef hb_atomic_int_impl_set |
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inline void hb_atomic_int_impl_set (int *AI, int v) { _hb_memory_w_barrier (); *AI = v; } |
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inline void hb_atomic_int_impl_set (short *AI, short v) { _hb_memory_w_barrier (); *AI = v; } |
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#endif |
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#ifndef hb_atomic_int_impl_get |
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inline int hb_atomic_int_impl_get (const int *AI) { int v = *AI; _hb_memory_r_barrier (); return v; } |
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inline short hb_atomic_int_impl_get (const short *AI) { short v = *AI; _hb_memory_r_barrier (); return v; } |
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#endif |
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#ifndef hb_atomic_ptr_impl_get |
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inline void *hb_atomic_ptr_impl_get (void ** const P) { void *v = *P; _hb_memory_r_barrier (); return v; } |
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#endif |
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struct hb_atomic_short_t |
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{ |
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hb_atomic_short_t () = default; |
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constexpr hb_atomic_short_t (short v) : v (v) {} |
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hb_atomic_short_t& operator = (short v_) { set_relaxed (v_); return *this; } |
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operator short () const { return get_relaxed (); } |
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void set_relaxed (short v_) { hb_atomic_int_impl_set_relaxed (&v, v_); } |
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void set_release (short v_) { hb_atomic_int_impl_set (&v, v_); } |
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short get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); } |
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short get_acquire () const { return hb_atomic_int_impl_get (&v); } |
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short inc () { return hb_atomic_int_impl_add (&v, 1); } |
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short dec () { return hb_atomic_int_impl_add (&v, -1); } |
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short v = 0; |
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}; |
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struct hb_atomic_int_t |
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{ |
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hb_atomic_int_t () = default; |
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constexpr hb_atomic_int_t (int v) : v (v) {} |
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hb_atomic_int_t& operator = (int v_) { set_relaxed (v_); return *this; } |
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operator int () const { return get_relaxed (); } |
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void set_relaxed (int v_) { hb_atomic_int_impl_set_relaxed (&v, v_); } |
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void set_release (int v_) { hb_atomic_int_impl_set (&v, v_); } |
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int get_relaxed () const { return hb_atomic_int_impl_get_relaxed (&v); } |
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int get_acquire () const { return hb_atomic_int_impl_get (&v); } |
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int inc () { return hb_atomic_int_impl_add (&v, 1); } |
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int dec () { return hb_atomic_int_impl_add (&v, -1); } |
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int v = 0; |
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}; |
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template <typename P> |
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struct hb_atomic_ptr_t |
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{ |
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typedef hb_remove_pointer<P> T; |
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hb_atomic_ptr_t () = default; |
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constexpr hb_atomic_ptr_t (T* v) : v (v) {} |
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void init (T* v_ = nullptr) { set_relaxed (v_); } |
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void set_relaxed (T* v_) { hb_atomic_ptr_impl_set_relaxed (&v, v_); } |
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T *get_relaxed () const { return (T *) hb_atomic_ptr_impl_get_relaxed (&v); } |
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T *get_acquire () const { return (T *) hb_atomic_ptr_impl_get ((void **) &v); } |
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bool cmpexch (const T *old, T *new_) const { return hb_atomic_ptr_impl_cmpexch ((void **) &v, (void *) old, (void *) new_); } |
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T * operator -> () const { return get_acquire (); } |
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template <typename C> operator C * () const { return get_acquire (); } |
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T *v = nullptr; |
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}; |
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#endif /* HB_ATOMIC_HH */
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