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36dd2c9450
rdar://119329771 This layout allows adding pre-specializations for trivial types that have a different size, but the same stride. This is especially useful for collections, where the stride is the important factor.
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
//===-- LayoutConstraintKind.h - Layout constraints kinds -------*- 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 - 2017 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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//
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// This file defines types and APIs for layout constraints.
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//
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//===----------------------------------------------------------------------===//
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#include <cstdint>
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#ifndef SWIFT_LAYOUT_CONSTRAINTKIND_H
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#define SWIFT_LAYOUT_CONSTRAINTKIND_H
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/// Describes a layout constraint information.
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enum class LayoutConstraintKind : uint8_t {
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// It is not a known layout constraint.
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UnknownLayout,
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// It is a layout constraint representing a trivial type of a known size.
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TrivialOfExactSize,
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// It is a layout constraint representing a trivial type of a size known to
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// be no larger than a given size.
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TrivialOfAtMostSize,
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// It is a layout constraint representing a trivial type of an unknown size.
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Trivial,
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// It is a layout constraint representing a reference counted class instance.
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Class,
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// It is a layout constraint representing a reference counted native class
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// instance.
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NativeClass,
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// It is a layout constraint representing a reference counted object.
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RefCountedObject,
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// It is a layout constraint representing a native reference counted object.
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NativeRefCountedObject,
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// It is a layout constraint representing a bridge object
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BridgeObject,
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// It is a layout constraint representing a trivial type of a known stride.
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TrivialStride,
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LastLayout = TrivialStride,
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};
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#endif
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