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bfbd812a21
For backtracking scopes that are never cancelled, we can completely disable the SyntaxParsingContext, avoiding the creation of deferred nodes which will never get recorded.
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
//===--- SyntaxTreeCreator.h - Syntax Tree Creation ------------*- 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 - 2019 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_PARSE_SYNTAXTREECREATOR_H
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#define SWIFT_SYNTAX_PARSE_SYNTAXTREECREATOR_H
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#include "swift/Parse/SyntaxParseActions.h"
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#include "swift/Syntax/References.h"
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#include "llvm/ADT/StringRef.h"
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namespace swift {
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class SourceManager;
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class SyntaxParsingCache;
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class SourceFile;
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namespace syntax {
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class SyntaxArena;
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class SourceFileSyntax;
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}
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/// Receives the parsed syntax info from the parser and constructs a persistent
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/// syntax tree by converting the data into \c RawSyntax objects, allocated from
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/// a \c SyntaxArena.
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///
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/// It also handles caching re-usable RawSyntax objects and skipping parsed
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/// nodes via consulting a \c SyntaxParsingCache.
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class SyntaxTreeCreator final : public SyntaxParseActions {
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SourceManager &SM;
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unsigned BufferID;
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RC<syntax::SyntaxArena> Arena;
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/// A string allocated in \c Arena that contains an exact copy of the source
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/// file for which this \c SyntaxTreeCreator creates a syntax tree. \c
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/// RawSyntax nodes can safely reference text inside this buffer since they
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/// retain the \c SyntaxArena which holds the buffer.
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StringRef ArenaSourceBuffer;
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/// A cache of nodes that can be reused when creating the current syntax
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/// tree.
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SyntaxParsingCache *SyntaxCache;
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public:
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SyntaxTreeCreator(SourceManager &SM, unsigned bufferID,
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SyntaxParsingCache *syntaxCache,
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RC<syntax::SyntaxArena> arena);
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~SyntaxTreeCreator();
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Optional<syntax::SourceFileSyntax>
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realizeSyntaxRoot(OpaqueSyntaxNode root, const SourceFile &SF) override;
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private:
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OpaqueSyntaxNode recordToken(tok tokenKind, StringRef leadingTrivia,
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StringRef trailingTrivia,
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CharSourceRange range) override;
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OpaqueSyntaxNode recordMissingToken(tok tokenKind, SourceLoc loc) override;
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OpaqueSyntaxNode
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recordRawSyntax(syntax::SyntaxKind kind,
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ArrayRef<OpaqueSyntaxNode> elements) override;
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std::pair<size_t, OpaqueSyntaxNode>
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lookupNode(size_t lexerOffset, syntax::SyntaxKind kind) override;
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OpaqueSyntaxNode makeDeferredToken(tok tokenKind, StringRef leadingTrivia,
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StringRef trailingTrivia,
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CharSourceRange range,
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bool isMissing) override;
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OpaqueSyntaxNode
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makeDeferredLayout(syntax::SyntaxKind k, bool IsMissing,
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const ArrayRef<RecordedOrDeferredNode> &children) override;
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OpaqueSyntaxNode recordDeferredToken(OpaqueSyntaxNode deferred) override;
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OpaqueSyntaxNode recordDeferredLayout(OpaqueSyntaxNode deferred) override;
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DeferredNodeInfo getDeferredChild(OpaqueSyntaxNode node, size_t ChildIndex,
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SourceLoc StartLoc) override;
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size_t getDeferredNumChildren(OpaqueSyntaxNode node) override;
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};
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} // end namespace swift
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#endif
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