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4da11aab58
Otherwise, we could theoretically get collisions, although they are quite unlikely to matter in practice.
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
//===--- SubstitutionList.h - Compact SubstitutionMap -----------*- 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 - 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 defines the SubstitutionList class, which is a memory-efficient
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// representation of a SubstitutionMap, intended to be stored in AST nodes and
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// SIL instructions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_SUBSTITUTION_LIST_H
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#define SWIFT_AST_SUBSTITUTION_LIST_H
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#include "swift/AST/Substitution.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/FoldingSet.h"
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namespace llvm {
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class FoldingSetNodeID;
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} // end namespace llvm
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namespace swift {
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// FIXME: Soon this will change.
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using SubstitutionList = ArrayRef<Substitution>;
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void dump(SubstitutionList subs);
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/// Create a canonicalized substitution list from subs.
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/// subs is the substitution list to be canonicalized.
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/// canSubs is an out-parameter, which is used to store the results in case
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/// the list of substitutions was not canonical.
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/// The function returns a list of canonicalized substitutions.
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/// If the substitution list subs was canonical already, it will be returned and
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/// canSubs out-parameter will be empty.
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/// If something had to be canonicalized, then the canSubs out-parameter will be
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/// populated and the returned SubstitutionList would refer to canSubs storage.
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SubstitutionList
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getCanonicalSubstitutionList(SubstitutionList subs,
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SmallVectorImpl<Substitution> &canSubs);
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/// Profile the substitution list for use in a folding set.
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void profileSubstitutionList(llvm::FoldingSetNodeID &id, SubstitutionList subs);
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} // end namespace swift
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#endif
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