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Instead, only reference count the SyntaxArena that the RawSyntax nodes live in. The user of RawSyntax nodes must guarantee that the SyntaxArena stays alive as long as the RawSyntax nodes are being accessed. During parse time, the SyntaxTreeCreator holds on to the SyntaxArena in which it creates RawSyntax nodes. When inspecting a syntax tree, the root SyntaxData node keeps the SyntaxArena alive. The change should be mostly invisible to the users of the public libSyntax API. This change significantly decreases the overall reference-counting overhead. Since we were not able to free individual RawSyntax nodes anyway, performing the reference-counting on the level of the SyntaxArena feels natural.
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
//===--- AbsoluteRawSyntax.cpp ----------------------------------*- 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 - 2020 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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#include "swift/Syntax/AbsoluteRawSyntax.h"
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using namespace swift;
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using namespace swift::syntax;
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std::atomic<SyntaxIdentifier::RootIdType> SyntaxIdentifier::NextUnusedRootId(0);
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SyntaxIndexInTree SyntaxIndexInTree::advancedBy(const RawSyntax *Raw) const {
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auto NewIndexInTree = IndexInTree;
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if (Raw) {
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NewIndexInTree += Raw->getTotalNodes();
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}
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return SyntaxIndexInTree(NewIndexInTree);
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}
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SyntaxIndexInTree SyntaxIndexInTree::reversedBy(const RawSyntax *Raw) const {
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auto NewIndexInTree = IndexInTree;
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if (Raw) {
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NewIndexInTree -= Raw->getTotalNodes();
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}
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return SyntaxIndexInTree(NewIndexInTree);
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}
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SyntaxIndexInTree SyntaxIndexInTree::advancedToFirstChild() const {
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auto NewIndexInTree = IndexInTree + 1;
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return SyntaxIndexInTree(NewIndexInTree);
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}
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AbsoluteSyntaxPosition
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AbsoluteSyntaxPosition::advancedBy(const RawSyntax *Raw) const {
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OffsetType NewOffset = Offset;
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if (Raw) {
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NewOffset += Raw->getTextLength();
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}
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IndexInParentType NewIndexInParent = IndexInParent + 1;
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return AbsoluteSyntaxPosition(NewOffset, NewIndexInParent);
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}
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AbsoluteSyntaxPosition
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AbsoluteSyntaxPosition::reversedBy(const RawSyntax *Raw) const {
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OffsetType NewOffset = Offset;
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if (Raw) {
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NewOffset -= Raw->getTextLength();
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}
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IndexInParentType NewIndexInParent = IndexInParent - 1;
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return AbsoluteSyntaxPosition(NewOffset, NewIndexInParent);
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}
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raw_ostream &llvm::operator<<(raw_ostream &OS,
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swift::syntax::AbsoluteOffsetPosition Pos) {
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OS << "Offset " << Pos.getOffset();
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return OS;
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}
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