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121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
//===--- SubstitutionMap.cpp - Type substitution map ----------------------===//
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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 - 2016 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 http://swift.org/LICENSE.txt for license information
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// See http://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 the SubstitutionMap class.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/SubstitutionMap.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/ProtocolConformance.h"
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#include "swift/AST/Types.h"
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using namespace swift;
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Optional<ProtocolConformanceRef> SubstitutionMap::
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lookupConformance(ProtocolDecl *proto,
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ArrayRef<ProtocolConformanceRef> conformances) const {
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for (ProtocolConformanceRef found : conformances) {
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auto foundProto = found.getRequirement();
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if (foundProto == proto)
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return found;
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if (foundProto->inheritsFrom(proto))
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return found.getInherited(proto);
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}
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return None;
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}
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template<typename Fn>
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Optional<ProtocolConformanceRef>
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SubstitutionMap::forEachParent(CanType type, Fn fn) const {
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auto foundParents = parentMap.find(type.getPointer());
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if (foundParents != parentMap.end()) {
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for (auto parent : foundParents->second) {
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if (auto result = fn(parent.first, parent.second))
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return result;
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}
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}
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if (auto archetypeType = dyn_cast<ArchetypeType>(type))
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if (auto *parent = archetypeType->getParent())
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return fn(CanType(parent), archetypeType->getAssocType());
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if (auto memberType = dyn_cast<DependentMemberType>(type))
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return fn(CanType(memberType->getBase()), memberType->getAssocType());
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return None;
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}
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Optional<ProtocolConformanceRef>
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SubstitutionMap::lookupConformance(CanType type,
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ProtocolDecl *proto) const {
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// Check for conformances for the type that apply to the original
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// substituted archetype.
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auto foundReplacement = conformanceMap.find(type.getPointer());
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if (foundReplacement != conformanceMap.end()) {
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auto substReplacement = foundReplacement->second;
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if (auto conformance = lookupConformance(proto, substReplacement))
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return conformance;
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}
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// Check if we have substitutions from one of our parent types.
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return forEachParent(type, [&](CanType parent, AssociatedTypeDecl *assocType)
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-> Optional<ProtocolConformanceRef> {
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auto *parentProto = assocType->getProtocol();
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auto conformance = lookupConformance(parent, parentProto);
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if (!conformance)
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return None;
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if (!conformance->isConcrete())
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return ProtocolConformanceRef(proto);
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auto sub = conformance->getConcrete()->getTypeWitnessSubstAndDecl(
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assocType, nullptr).first;
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return lookupConformance(proto, sub.getConformances());
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});
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}
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void SubstitutionMap::
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addSubstitution(CanType type, Type replacement) {
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auto result = subMap.insert(std::make_pair(type.getPointer(), replacement));
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assert(result.second);
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(void) result;
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}
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void SubstitutionMap::
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addConformances(CanType type, ArrayRef<ProtocolConformanceRef> conformances) {
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if (conformances.empty())
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return;
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auto result = conformanceMap.insert(
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std::make_pair(type.getPointer(), conformances));
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assert(result.second);
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(void) result;
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}
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ArrayRef<ProtocolConformanceRef> SubstitutionMap::
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getConformances(CanType type) const {
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auto known = conformanceMap.find(type.getPointer());
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if (known == conformanceMap.end()) return { };
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return known->second;
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}
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void SubstitutionMap::
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addParent(CanType type, CanType parent, AssociatedTypeDecl *assocType) {
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assert(type && parent && assocType);
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parentMap[type.getPointer()].push_back(std::make_pair(parent, assocType));
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}
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