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c343298b8f
A return statement needs something to return, so implement
integer-literal-expression too. This necessarily also forced
UnknownExprSyntax, UnknownStmtSyntax, and UnknownDeclSyntax,
which are stand-in token buckets for when we don't know
how to transform/migrate an AST.
This commit also contains the core function for caching
SyntaxData children. This is highly tricky code, with some
detailed comments in SyntaxData.{h,cpp}. The gist is that
we have to atomically swap in a SyntaxData pointer into the
child field, so we can maintain pointer identity of SyntaxData
nodes, while still being able to cache them internally.
To prove that this works, there is a multithreaded test that
checks that two threads can ask for a child that hasn't been
cached yet without crashing or violating pointer identity.
https://bugs.swift.org/browse/SR-4010
71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
//===--- Syntax.cpp - Swift Syntax Implementation ---------------*- 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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#include "swift/Syntax/Syntax.h"
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#include "swift/Syntax/SyntaxData.h"
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using namespace swift;
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using namespace swift::syntax;
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Syntax::Syntax(const RC<SyntaxData> Root, const SyntaxData *Data)
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: Root(Root), Data(Data) {}
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RC<RawSyntax> Syntax::getRaw() const {
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return Data->getRaw();
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}
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SyntaxKind Syntax::getKind() const {
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return getRaw()->Kind;
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}
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void Syntax::print(llvm::raw_ostream &OS) const {
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getRaw()->print(OS);
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}
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void Syntax::dump() const {
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getRaw()->dump();
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}
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void Syntax::dump(llvm::raw_ostream &OS, unsigned Indent) const {
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getRaw()->dump(OS, 0);
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}
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bool Syntax::isType() const {
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return Data->isType();
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}
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bool Syntax::isDecl() const {
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return Data->isDecl();
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}
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bool Syntax::isStmt() const {
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return Data->isStmt();
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}
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bool Syntax::isExpr() const {
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return Data->isExpr();
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}
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#pragma mark - unknown-syntax API
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UnknownSyntax::UnknownSyntax(const RC<SyntaxData> Root,
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UnknownSyntaxData *Data)
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: Syntax(Root, Data) {}
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UnknownSyntax UnknownSyntax::make(RC<RawSyntax> Raw) {
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auto Data = UnknownSyntaxData::make(Raw);
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return UnknownSyntax {
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Data, Data.get()
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};
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}
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