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c4233e98ff
Add PrintOptions to Substitution::print and ProtocolConformance::printName. rdar://18021102 Swift SVN r22366
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
//===--- Substitution.h - Swift Generic Substitution ASTs -------*- 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 - 2015 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 Substitution class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_SUBSTITUTION_H
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#define SWIFT_AST_SUBSTITUTION_H
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#include "swift/AST/Type.h"
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#include "llvm/ADT/ArrayRef.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 ArchetypeType;
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class ProtocolConformance;
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/// DenseMap type used internally by Substitution::subst to track conformances
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/// applied to archetypes.
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using ArchetypeConformanceMap
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= llvm::DenseMap<ArchetypeType*, ArrayRef<ProtocolConformance*>>;
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/// Substitution - A substitution into a generic specialization.
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class Substitution {
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ArchetypeType * Archetype = nullptr;
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Type Replacement;
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ArrayRef<ProtocolConformance *> Conformance;
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public:
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/// FIXME: An archetype that looks like the archetype or dependent generic
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/// parameter type that should be substituted by this substitution, but
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/// which is not guaranteed to map to any particular context. All that is
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/// guaranteed:
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///
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/// - Archetype will conform to the same protocols as the substituted
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/// type.
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/// - Archetype will appear at the same point in the generic parameter
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/// hierarchy as the substituted type; that is, if the substituted type
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/// is a generic parameter, it will be a primary archetype, or if the
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/// substituted type is a dependent member type, it will be a nested
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/// archetype with the same name path--if T0.Foo.Bar is being substituted,
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/// this will be some archetype X.Foo.Bar.
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/// - If the substituted type represents a Self or associated type of a
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/// protocol requirement, this Archetype will be that archetype from the
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/// protocol context.
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///
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/// You really shouldn't use the value of this field for anything new.
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ArchetypeType *getArchetype() const { return Archetype; }
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/// The replacement type.
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Type getReplacement() const { return Replacement; }
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/// The protocol conformances for the replacement. These appear in the same
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/// order as Archetype->getConformsTo() for the substituted archetype.
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const ArrayRef<ProtocolConformance *> getConformances() const {
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return Conformance;
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}
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Substitution() {}
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Substitution(ArchetypeType *Archetype,
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Type Replacement,
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ArrayRef<ProtocolConformance*> Conformance);
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bool operator!=(const Substitution &other) const { return !(*this == other); }
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bool operator==(const Substitution &other) const;
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void print(llvm::raw_ostream &os,
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const PrintOptions &PO = PrintOptions()) const;
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void dump() const;
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/// Substitute the replacement and conformance types with the given
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/// substitution vector.
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Substitution subst(Module *module,
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GenericParamList *context,
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ArrayRef<Substitution> subs) const;
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private:
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friend class ProtocolConformance;
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Substitution subst(Module *module,
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ArrayRef<Substitution> subs,
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TypeSubstitutionMap &subMap,
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ArchetypeConformanceMap &conformanceMap) const;
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};
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} // end namespace swift
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#endif
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