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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* For documentation, see jit/AtomicOperations.h */
#ifndef jit_arm64_AtomicOperations_arm64_h
#define jit_arm64_AtomicOperations_arm64_h
#include "mozilla/Assertions.h"
#include "mozilla/Types.h"
inline bool
js::jit::AtomicOperations::isLockfree8()
{
MOZ_ASSERT(__atomic_always_lock_free(sizeof(int8_t), 0));
MOZ_ASSERT(__atomic_always_lock_free(sizeof(int16_t), 0));
MOZ_ASSERT(__atomic_always_lock_free(sizeof(int32_t), 0));
return true;
}
inline void
js::jit::AtomicOperations::fenceSeqCst()
{
__atomic_thread_fence(__ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::loadSeqCst(T* addr)
{
MOZ_ASSERT(sizeof(T) < 8 || isLockfree8());
T v;
__atomic_load(addr, &v, __ATOMIC_SEQ_CST);
return v;
}
template<typename T>
inline void
js::jit::AtomicOperations::storeSeqCst(T* addr, T val)
{
MOZ_ASSERT(sizeof(T) < 8 || isLockfree8());
__atomic_store(addr, &val, __ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::exchangeSeqCst(T* addr, T val)
{
MOZ_ASSERT(sizeof(T) < 8 || isLockfree8());
T v;
__atomic_exchange(addr, &val, &v, __ATOMIC_SEQ_CST);
return v;
}
template<typename T>
inline T
js::jit::AtomicOperations::compareExchangeSeqCst(T* addr, T oldval, T newval)
{
MOZ_ASSERT(sizeof(T) < 8 || isLockfree8());
__atomic_compare_exchange(addr, &oldval, &newval, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
return oldval;
}
template<typename T>
inline T
js::jit::AtomicOperations::fetchAddSeqCst(T* addr, T val)
{
static_assert(sizeof(T) <= 4, "not available for 8-byte values yet");
return __atomic_fetch_add(addr, val, __ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::fetchSubSeqCst(T* addr, T val)
{
static_assert(sizeof(T) <= 4, "not available for 8-byte values yet");
return __atomic_fetch_sub(addr, val, __ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::fetchAndSeqCst(T* addr, T val)
{
static_assert(sizeof(T) <= 4, "not available for 8-byte values yet");
return __atomic_fetch_and(addr, val, __ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::fetchOrSeqCst(T* addr, T val)
{
static_assert(sizeof(T) <= 4, "not available for 8-byte values yet");
return __atomic_fetch_or(addr, val, __ATOMIC_SEQ_CST);
}
template<typename T>
inline T
js::jit::AtomicOperations::fetchXorSeqCst(T* addr, T val)
{
static_assert(sizeof(T) <= 4, "not available for 8-byte values yet");
return __atomic_fetch_xor(addr, val, __ATOMIC_SEQ_CST);
}
template <typename T>
inline T
js::jit::AtomicOperations::loadSafeWhenRacy(T* addr)
{
return *addr; // FIXME (1208663): not yet safe
}
template <typename T>
inline void
js::jit::AtomicOperations::storeSafeWhenRacy(T* addr, T val)
{
*addr = val; // FIXME (1208663): not yet safe
}
inline void
js::jit::AtomicOperations::memcpySafeWhenRacy(void* dest, const void* src,
size_t nbytes)
{
memcpy(dest, src, nbytes); // FIXME (1208663): not yet safe
}
inline void
js::jit::AtomicOperations::memmoveSafeWhenRacy(void* dest, const void* src,
size_t nbytes)
{
memmove(dest, src, nbytes); // FIXME (1208663): not yet safe
}
template<size_t nbytes>
inline void
js::jit::RegionLock::acquire(void* addr)
{
uint32_t zero = 0;
uint32_t one = 1;
while (!__atomic_compare_exchange(&spinlock, &zero, &one, false, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE)) {
zero = 0;
continue;
}
}
template<size_t nbytes>
inline void
js::jit::RegionLock::release(void* addr)
{
MOZ_ASSERT(AtomicOperations::loadSeqCst(&spinlock) == 1, "releasing unlocked region lock");
uint32_t zero = 0;
__atomic_store(&spinlock, &zero, __ATOMIC_SEQ_CST);
}
#endif // jit_arm64_AtomicOperations_arm64_h
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