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88ee618a33
This bit has historically survived typechecking and parsing across source files. Stick it where we stick the other global state. This also means we don't have to thread TopLevelContext around anymore when invoking high-level typechecking entrypoints.
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===--- LocalContext.h - Parser state across a local context ---*- 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 LocalContext class, which holds state
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// required by the parser for parsing statements and expressions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_PARSE_LOCALCONTEXT_H
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#define SWIFT_PARSE_LOCALCONTEXT_H
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#include "llvm/ADT/DenseMap.h"
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#include <cassert>
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namespace swift {
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class Identifier;
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/// Information associated with parsing a local context.
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class LocalContext {
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/// A map holding the next discriminator for declarations with
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/// various identifiers.
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llvm::DenseMap<Identifier, unsigned> LocalDiscriminators;
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/// The next discriminator for an explicit closure expression.
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unsigned NextClosureDiscriminator = 0;
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LocalContext(const LocalContext &) = delete;
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LocalContext &operator=(const LocalContext &) = delete;
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public:
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LocalContext() = default;
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/// Return a number that'll be unique in this context across all
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/// declarations with the given name.
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unsigned claimNextNamedDiscriminator(Identifier name) {
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assert(!name.empty() &&
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"setting a local discriminator on an anonymous decl; "
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"maybe the name hasn't been set yet?");
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return LocalDiscriminators[name]++;
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}
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/// Return a number that'll be unique in this context across all
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/// explicit anonymous closure expressions.
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unsigned claimNextClosureDiscriminator() {
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return NextClosureDiscriminator++;
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}
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/// True if we saw any anonymous closures. This is useful when
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/// parsing an initializer context, because such contexts only
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/// need to exist if the initializer contains closures.
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bool hasClosures() const { return NextClosureDiscriminator != 0; }
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};
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/// Information associated with parsing the top-level context.
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class TopLevelContext : public LocalContext {};
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} // end namespace swift
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#endif
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