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|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
%{
from gyb_utils import *
}%
${autogenerated_warning()}
#if !ATOMICS_NATIVE_BUILTINS
import _AtomicsShims
@_alwaysEmitIntoClient
@_transparent
internal func _atomicMemoryFence(
ordering: AtomicUpdateOrdering
) {
switch ordering {
case .relaxed:
break
% for (enumOrder, apiOrder, docOrder, llvmOrder, _) in updateOrderings:
% if enumOrder != "relaxed":
case .${enumOrder}:
_sa_thread_fence_${shim_name(llvmOrder)}()
% end
% end
default:
fatalError("Unsupported ordering")
}
}
% for (storageType, valueType) in cPrimitives:
extension UnsafeMutablePointer where Pointee == ${storageType} {
/// Atomically loads a word starting at this address with the specified
/// memory ordering.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
@usableFromInline
internal func _atomicLoad(ordering: AtomicLoadOrdering) -> ${valueType} {
switch ordering {
% for (enumOrder, apiOrder, docOrder, llvmOrder) in loadOrderings:
case .${enumOrder}:
return _sa_load_${shim_name(llvmOrder)}_${valueType}(self)
% end
default:
fatalError("Unsupported ordering")
}
}
/// Atomically stores the specified value starting at the memory referenced by
/// this pointer, with the specified memory ordering.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
@usableFromInline
internal func _atomicStore(
_ desired: ${valueType},
ordering: AtomicStoreOrdering
) {
switch ordering {
% for (enumOrder, apiOrder, docOrder, llvmOrder) in storeOrderings:
case .${enumOrder}:
_sa_store_${shim_name(llvmOrder)}_${valueType}(self, desired)
% end
default:
fatalError("Unsupported ordering")
}
}
/// Atomically stores the specified value starting at the memory referenced by
/// this pointer, with the specified memory ordering.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
public func _atomicExchange(
_ desired: ${valueType},
ordering: AtomicUpdateOrdering
) -> ${valueType} {
switch ordering {
% for (enumOrder, apiOrder, docOrder, llvmOrder, failOrder) in updateOrderings:
case .${enumOrder}:
return _sa_exchange_${shim_name(llvmOrder)}_${valueType}(self, desired)
% end
default:
fatalError("Unsupported ordering")
}
}
/// Perform an atomic compare and exchange operation with the specified memory
/// ordering.
///
/// This operation is equivalent to the following pseudocode:
///
/// ```
/// atomic(self, ordering) { currentValue in
/// let original = currentValue
/// guard original == expected else { return (false, original) }
/// currentValue = desired
/// return (true, original)
/// }
/// ```
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
public func _atomicCompareExchange(
expected: ${valueType},
desired: ${valueType},
ordering: AtomicUpdateOrdering
) -> (exchanged: Bool, original: ${valueType}) {
var expected = expected
let exchanged: Bool
switch ordering {
% for (enumOrder, apiOrder, docOrder, llvmOrder, failOrder) in updateOrderings:
case .${enumOrder}:
exchanged = _sa_cmpxchg_strong_${shim_name(llvmOrder)}_${shim_name(failOrder)}_${valueType}(
self, &expected, desired)
% end
default:
fatalError("Unsupported ordering")
}
return (exchanged, expected)
}
/// Perform an atomic compare and exchange operation with the specified
/// success/failure memory orderings.
///
/// This operation is equivalent to the following pseudocode:
///
/// ```
/// atomic(self, ordering, failureOrdering) { currentValue in
/// let original = currentValue
/// guard original == expected else { return (false, original) }
/// currentValue = desired
/// return (true, original)
/// }
/// ```
///
/// The `ordering` argument specifies the memory ordering to use when the
/// operation manages to update the current value, while `failureOrdering`
/// will be used when the operation leaves the value intact.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
public func _atomicCompareExchange(
expected: ${valueType},
desired: ${valueType},
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: ${valueType}) {
// FIXME: LLVM doesn't support arbitrary ordering combinations
// yet, so upgrade the success ordering when necessary so that it
// is at least as "strong" as the failure case.
var expected = expected
let exchanged: Bool
switch (successOrdering, failureOrdering) {
% for (swiftSuccess, apiSuccess, _, llvmOrder, _) in updateOrderings:
% for (swiftFailure, apiFailure, _, llvmFailure) in loadOrderings:
case (.${swiftSuccess}, .${swiftFailure}):
exchanged = _sa_cmpxchg_strong_${actualShimOrders(llvmOrder, llvmFailure)}_${valueType}(
self, &expected, desired)
% end
% end
default:
preconditionFailure("Unsupported orderings")
}
return (exchanged, expected)
}
/// Perform an atomic compare and exchange operation with the specified
/// success/failure memory orderings.
///
/// This operation is equivalent to the following pseudocode:
///
/// ```
/// atomic(self, ordering, failureOrdering) { currentValue in
/// let original = currentValue
/// guard original == expected else { return (false, original) }
/// currentValue = desired
/// return (true, original)
/// }
/// ```
///
/// The `ordering` argument specifies the memory ordering to use when the
/// operation manages to update the current value, while `failureOrdering`
/// will be used when the operation leaves the value intact.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
public func _atomicWeakCompareExchange(
expected: ${valueType},
desired: ${valueType},
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: ${valueType}) {
// FIXME: LLVM doesn't support arbitrary ordering combinations
// yet, so upgrade the success ordering when necessary so that it
// is at least as "strong" as the failure case.
var expected = expected
let exchanged: Bool
switch (successOrdering, failureOrdering) {
% for (swiftSuccess, apiSuccess, _, llvmOrder, _) in updateOrderings:
% for (swiftFailure, apiFailure, _, llvmFailure) in loadOrderings:
case (.${swiftSuccess}, .${swiftFailure}):
exchanged = _sa_cmpxchg_weak_${actualShimOrders(llvmOrder, llvmFailure)}_${valueType}(
self, &expected, desired)
% end
% end
default:
preconditionFailure("Unsupported orderings")
}
return (exchanged, expected)
}
% if valueType != "DoubleWord":
% for (swiftName, builtinName, operator, label, doc) in integerOperations:
/// Perform an atomic ${doc} operation and return the new value,
/// with the specified memory ordering.
///
% if "Wrapping" in swiftName:
/// - Note: This operation silently wraps around on overflow, like the
/// `${operator}` operator does on `UInt` values.
///
% end
/// - Returns: The original value before the operation.
@_semantics("atomics.requires_constant_orderings")
@_alwaysEmitIntoClient
@_transparent // Debug performance
@usableFromInline
internal
func _atomicLoadThen${swiftName}(
${label} operand: ${valueType},
ordering: AtomicUpdateOrdering
) -> ${valueType} {
switch ordering {
% for (enumOrder, apiOrder, docOrder, llvmOrder, failOrder) in updateOrderings:
case .${enumOrder}:
return _sa_fetch_${builtinName}_${shim_name(llvmOrder)}_${valueType}(
self, operand)
% end
default:
preconditionFailure("Unsupported ordering")
}
}
% end
% end
}
% end
#endif // ATOMICS_NATIVE_BUILTINS
|
