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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
//===--- ExtendedExistential.h - IRGen support for existentials -*- 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 - 2022 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 routines useful for working with extended
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// existential type shapes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_EXTENDEDEXISTENTIAL_H
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#define SWIFT_IRGEN_EXTENDEDEXISTENTIAL_H
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#include "swift/AST/Types.h"
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#include "swift/SIL/FormalLinkage.h"
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namespace swift {
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namespace irgen {
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class IRGenModule;
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/// A type describing all the IRGen-relevant details of an extended
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/// existential type shape.
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class ExtendedExistentialTypeShapeInfo {
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public:
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CanGenericSignature genSig;
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CanType shapeType;
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SubstitutionMap genSubs; // optional
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CanGenericSignature reqSig;
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FormalLinkage linkage;
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/// Get the extended existential type shape for the given
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/// existential type.
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///
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/// `genSubs` will be set in the returned value.
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static ExtendedExistentialTypeShapeInfo get(CanType type);
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/// Get the extended existential type shape for the given
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/// base existential type and metatype depth.
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///
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/// `genSubs` will not be set in the returned value.
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static ExtendedExistentialTypeShapeInfo get(
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const ExistentialTypeGeneralization &gen,
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unsigned metatypeDepth);
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/// Is this shape guaranteed to be unique after static linking?
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/// If false, the shape object will have a NonUnique prefix.
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bool isUnique() const { return linkage != FormalLinkage::PublicNonUnique; }
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/// Should this shape be uniqued by the static linker? If false,
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/// the shape object will be private to the translation unit.
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bool isShared() const { return linkage != FormalLinkage::Private; }
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};
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/// Emit the extended existential type shape for the given existential
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/// type generalization.
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llvm::Constant *emitExtendedExistentialTypeShape(IRGenModule &IGM,
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const ExtendedExistentialTypeShapeInfo &shape);
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} // end namespace irgen
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} // end namespace swift
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#endif
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