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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//===--- ReferenceCounting.h ------------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_REFERENCE_COUNTING_H
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#define SWIFT_AST_REFERENCE_COUNTING_H
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namespace swift {
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/// The kind of reference counting implementation a heap object uses.
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enum class ReferenceCounting : uint8_t {
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/// The object uses native Swift reference counting.
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Native,
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/// The object uses ObjC reference counting.
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///
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/// When ObjC interop is enabled, native Swift class objects are also ObjC
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/// reference counting compatible. Swift non-class heap objects are never
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/// ObjC reference counting compatible.
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///
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/// Blocks are always ObjC reference counting compatible.
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ObjC,
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/// The object has no reference counting. This is used by foreign reference
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/// types.
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None,
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/// The object uses swift_attr("retain:XXX") and "release:XXX" to implement
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/// reference counting.
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Custom,
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/// The object uses _Block_copy/_Block_release reference counting.
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///
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/// This is a strict subset of ObjC; all blocks are also ObjC reference
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/// counting compatible. The block is assumed to have already been moved to
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/// the heap so that _Block_copy returns the same object back.
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Block,
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/// The object has an unknown reference counting implementation.
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///
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/// This uses maximally-compatible reference counting entry points in the
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/// runtime.
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Unknown,
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/// Cases prior to this one are binary-compatible with Unknown reference
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/// counting.
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LastUnknownCompatible = Unknown,
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/// The object has an unknown reference counting implementation and
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/// the reference value may contain extra bits that need to be masked.
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///
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/// This uses maximally-compatible reference counting entry points in the
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/// runtime, with a masking layer on top. A bit inside the pointer is used
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/// to signal native Swift refcounting.
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Bridge,
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/// The object uses ErrorType's reference counting entry points.
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Error,
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};
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} // end namespace swift
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#endif
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