//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//

import Swift

// This type intentionally shadows the stdlib one
@available(swift, introduced: 5.0)
public final class _stdlib_AtomicInt {
  internal var _value: Int

  internal var _valuePtr: UnsafeMutablePointer<Int> {
    return _getUnsafePointerToStoredProperties(self).assumingMemoryBound(
      to: Int.self)
  }

  public init(_ value: Int = 0) {
    _value = value
  }

  public func store(_ desired: Int) {
    return _swift_stdlib_atomicStoreInt(object: _valuePtr, desired: desired)
  }

  public func load() -> Int {
    return _swift_stdlib_atomicLoadInt(object: _valuePtr)
  }

% for operation_name, operation in [ ('Add', '+'), ('And', '&'), ('Or', '|'), ('Xor', '^') ]:
  @discardableResult
  public func fetchAnd${operation_name}(_ operand: Int) -> Int {
    return _swift_stdlib_atomicFetch${operation_name}Int(
      object: _valuePtr,
      operand: operand)
  }

  public func ${operation_name.lower()}AndFetch(_ operand: Int) -> Int {
    return fetchAnd${operation_name}(operand) ${operation} operand
  }
% end

  public func compareExchange(expected: inout Int, desired: Int) -> Bool {
    var expectedVar = expected
    let result = _swift_stdlib_atomicCompareExchangeStrongInt(
      object: _valuePtr,
      expected: &expectedVar,
      desired: desired)
    expected = expectedVar
    return result
  }
}