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56a923475f
Instead of having a heap-allocated RefCountedBox to store a SyntaxData's parent, reference-count SyntaxData itself. This has a couple of advantages: - When passing SyntaxData around, only a pointer needs to be passed instead of the entire struct contents. This is faster. - We can later introduce a SyntaxDataRef, which behaves similar to SyntaxData, but delegates the responsibility that the parent stays alive to the user. While sacrificing guaranteed memory safety, this means that SyntaxData can then be stack-allocated without any ref-counting overhead.
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
//===--- UnknownSyntax.h - Swift Unknown Syntax Interface -------*- 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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#ifndef SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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#define SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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#include "swift/Syntax/SyntaxData.h"
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#include "swift/Syntax/Syntax.h"
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namespace swift {
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namespace syntax {
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#pragma mark unknown-syntax API
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/// A chunk of "unknown" syntax.
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///
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/// Effectively wraps a tree of RawSyntax.
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///
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/// This should not be vended by SyntaxFactory.
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class UnknownSyntax : public Syntax {
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void validate() const;
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public:
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UnknownSyntax(const RC<const SyntaxData> &Data) : Syntax(Data) {}
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static bool classof(const Syntax *S) {
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return S->isUnknown();
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}
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};
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} // end namespace syntax
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} // end namespace swift
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#endif // SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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