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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/. */
#ifndef jit_AtomicOp_h
#define jit_AtomicOp_h
namespace js {
namespace jit {
// Types of atomic operation, shared by MIR and LIR.
enum AtomicOp {
AtomicFetchAddOp,
AtomicFetchSubOp,
AtomicFetchAndOp,
AtomicFetchOrOp,
AtomicFetchXorOp
};
// Memory barrier types, shared by MIR and LIR.
//
// MembarSynchronizing is here because some platforms can make the
// distinction (DSB vs DMB on ARM, SYNC vs parameterized SYNC on MIPS)
// but there's been no reason to use it yet.
enum MemoryBarrierBits {
MembarLoadLoad = 1,
MembarLoadStore = 2,
MembarStoreStore = 4,
MembarStoreLoad = 8,
MembarSynchronizing = 16,
// For validity testing
MembarNobits = 0,
MembarAllbits = 31,
};
static inline constexpr MemoryBarrierBits
operator|(MemoryBarrierBits a, MemoryBarrierBits b)
{
return MemoryBarrierBits(int(a) | int(b));
}
static inline constexpr MemoryBarrierBits
operator&(MemoryBarrierBits a, MemoryBarrierBits b)
{
return MemoryBarrierBits(int(a) & int(b));
}
static inline constexpr MemoryBarrierBits
operator~(MemoryBarrierBits a)
{
return MemoryBarrierBits(~int(a));
}
// Standard barrier bits for a full barrier.
static constexpr MemoryBarrierBits MembarFull = MembarLoadLoad|MembarLoadStore|MembarStoreLoad|MembarStoreStore;
// Standard sets of barrier bits for atomic loads and stores.
// See http://gee.cs.oswego.edu/dl/jmm/cookbook.html for more.
static constexpr MemoryBarrierBits MembarBeforeLoad = MembarNobits;
static constexpr MemoryBarrierBits MembarAfterLoad = MembarLoadLoad|MembarLoadStore;
static constexpr MemoryBarrierBits MembarBeforeStore = MembarStoreStore;
static constexpr MemoryBarrierBits MembarAfterStore = MembarStoreLoad;
} // namespace jit
} // namespace js
#endif /* jit_AtomicOp_h */
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