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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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
#include <stdint.h>
namespace js {
namespace jit {
// Types of atomic operation, shared by MIR and LIR.
enum class AtomicOp {
Add,
Sub,
And,
Or,
Xor,
};
// 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 : uint8_t {
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(static_cast<uint8_t>(a) | static_cast<uint8_t>(b));
}
static inline constexpr MemoryBarrierBits operator&(MemoryBarrierBits a,
MemoryBarrierBits b) {
return MemoryBarrierBits(static_cast<uint8_t>(a) & static_cast<uint8_t>(b));
}
static inline constexpr MemoryBarrierBits operator~(MemoryBarrierBits a) {
return MemoryBarrierBits(~static_cast<uint8_t>(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;
struct Synchronization {
const MemoryBarrierBits barrierBefore;
const MemoryBarrierBits barrierAfter;
constexpr Synchronization(MemoryBarrierBits before, MemoryBarrierBits after)
: barrierBefore(before), barrierAfter(after) {}
static Synchronization None() {
return Synchronization(MemoryBarrierBits(MembarNobits),
MemoryBarrierBits(MembarNobits));
}
static Synchronization Full() {
return Synchronization(MembarFull, MembarFull);
}
static Synchronization Load() {
return Synchronization(MembarBeforeLoad, MembarAfterLoad);
}
static Synchronization Store() {
return Synchronization(MembarBeforeStore, MembarAfterStore);
}
bool isNone() const { return (barrierBefore | barrierAfter) == MembarNobits; }
};
} // namespace jit
} // namespace js
#endif /* jit_AtomicOp_h */
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