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86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
//===--- Substitution.cpp - Type substitutions ----------------------------===//
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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 implements the Substitution class and operations on it.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/Substitution.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/GenericEnvironment.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/ProtocolConformance.h"
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#include "swift/AST/SubstitutionMap.h"
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#include "swift/AST/Types.h"
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#include "llvm/ADT/DenseMap.h"
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using namespace swift;
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bool Substitution::operator==(const Substitution &other) const {
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// The archetypes may be missing, but we can compare them directly
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// because archetypes are always canonical.
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return
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Replacement->isEqual(other.Replacement) &&
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Conformance.equals(other.Conformance);
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}
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Substitution::Substitution(Type Replacement,
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ArrayRef<ProtocolConformanceRef> Conformance)
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: Replacement(Replacement), Conformance(Conformance)
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{
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// The replacement type must be materializable.
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assert(Replacement->isMaterializable()
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&& "cannot substitute with a non-materializable type");
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}
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Substitution Substitution::subst(const SubstitutionMap &subMap) const {
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return subst(QuerySubstitutionMap{subMap},
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LookUpConformanceInSubstitutionMap(subMap));
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}
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Substitution Substitution::subst(TypeSubstitutionFn subs,
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LookupConformanceFn conformances) const {
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// Substitute the replacement.
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Type substReplacement = Replacement.subst(subs, conformances,
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SubstFlags::UseErrorType);
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assert(!substReplacement->hasError() &&
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"substitution replacement failed");
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if (substReplacement->isEqual(Replacement))
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return *this;
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if (Conformance.empty()) {
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return {substReplacement, Conformance};
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}
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bool conformancesChanged = false;
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SmallVector<ProtocolConformanceRef, 4> substConformances;
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substConformances.reserve(Conformance.size());
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for (auto c : Conformance) {
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auto newC = c.subst(Replacement, subs, conformances);
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if (c != newC)
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conformancesChanged = true;
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substConformances.push_back(newC);
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}
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assert(substConformances.size() == Conformance.size());
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ArrayRef<ProtocolConformanceRef> substConfs;
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if (conformancesChanged)
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substConfs = Replacement->getASTContext().AllocateCopy(substConformances);
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else
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substConfs = Conformance;
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return Substitution{substReplacement, substConfs};
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}
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