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We already need to track the inverses separate from the members in a ProtocolCompositionType, since inverses aren't real types. Thus, the only purpose being served by InverseType is to be eliminated by RequirementLowering when it appears in a conformance requirement. Instead, we introduce separate type InverseRequirement just to keep track of which inverses we encounter to facilitate cancelling-out defaults and ensuring that the inverses are respected after running the RequirementMachine.
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//===--- RequirementLowering.h - Requirement inference and desugaring -----===//
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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) 2021 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_REQUIREMENTLOWERING_H
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#define SWIFT_REQUIREMENTLOWERING_H
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#include "swift/AST/Type.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include <vector>
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#include "Diagnostics.h"
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namespace llvm {
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class raw_ostream;
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}
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namespace swift {
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class AssociatedTypeDecl;
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class ProtocolDecl;
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class ProtocolTypeAlias;
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class Requirement;
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namespace rewriting {
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// Entry points used by AbstractGenericSignatureRequest and
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// InferredGenericSignatureRequest; see RequirementLowering.cpp for
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// documentation
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// comments.
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void desugarRequirements(SmallVector<StructuralRequirement, 2> &result,
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SmallVectorImpl<InverseRequirement> &inverses,
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SmallVectorImpl<RequirementError> &errors);
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void desugarRequirement(Requirement req, SourceLoc loc,
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SmallVectorImpl<Requirement> &result,
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SmallVectorImpl<InverseRequirement> &inverses,
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SmallVectorImpl<RequirementError> &errors);
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void inferRequirements(Type type, SourceLoc loc,
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ModuleDecl *module, DeclContext *dc,
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SmallVectorImpl<StructuralRequirement> &result);
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void realizeRequirement(DeclContext *dc,
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Requirement req, RequirementRepr *reqRepr,
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bool shouldInferRequirements,
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SmallVectorImpl<StructuralRequirement> &result,
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SmallVectorImpl<RequirementError> &errors);
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void realizeInheritedRequirements(TypeDecl *decl, Type type,
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bool shouldInferRequirements,
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SmallVectorImpl<StructuralRequirement> &result,
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SmallVectorImpl<RequirementError> &errors);
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void applyInverses(ASTContext &ctx,
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ArrayRef<Type> gps,
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ArrayRef<InverseRequirement> inverseList,
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SmallVectorImpl<StructuralRequirement> &result,
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SmallVectorImpl<RequirementError> &errors);
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// Defined in ConcreteContraction.cpp.
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bool performConcreteContraction(
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ArrayRef<StructuralRequirement> requirements,
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SmallVectorImpl<StructuralRequirement> &result,
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SmallVectorImpl<RequirementError> &errors,
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bool debug);
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} // end namespace rewriting
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} // end namespace swift
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#endif
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