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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
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
//===--- ExprSyntax.cpp - Swift Expression Syntax Impl. ---------*- 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/ExprSyntax.h"
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using namespace swift;
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using namespace swift::syntax;
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#pragma mark - expression Data
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RC<ExprSyntaxData> ExprSyntaxData::make(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent) {
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return RC<ExprSyntaxData> {
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new ExprSyntaxData {
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Raw, Parent, IndexInParent
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}
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};
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}
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RC<ExprSyntaxData> ExprSyntaxData::makeBlank() {
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return make(RawSyntax::missing(SyntaxKind::MissingExpr));
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}
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#pragma mark - expression API
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ExprSyntax::ExprSyntax(const RC<SyntaxData> Root, const ExprSyntaxData *Data)
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: Syntax(Root, Data) {}
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#pragma mark - unknown-expression Data
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UnknownExprSyntaxData::UnknownExprSyntaxData(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent)
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: ExprSyntaxData(Raw, Parent, IndexInParent) {
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assert(Raw->Kind == SyntaxKind::UnknownExpr);
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}
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RC<UnknownExprSyntaxData>
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UnknownExprSyntaxData::make(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent) {
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return RC<UnknownExprSyntaxData> {
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new UnknownExprSyntaxData {
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Raw, Parent, IndexInParent
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}
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};
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}
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#pragma mark - unknown-expression API
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UnknownExprSyntax::UnknownExprSyntax(const RC<SyntaxData> Root,
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const UnknownExprSyntaxData *Data)
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: ExprSyntax(Root, Data) {}
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#pragma mark - integer-literal-expression Data
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IntegerLiteralExprSyntaxData::
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IntegerLiteralExprSyntaxData(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent)
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: ExprSyntaxData(Raw, Parent, IndexInParent) {
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assert(Raw->Kind == SyntaxKind::IntegerLiteralExpr);
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assert(Raw->Layout.size() == 2);
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syntax_assert_child_token(Raw, IntegerLiteralExprSyntax::Cursor::Sign,
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tok::oper_prefix);
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syntax_assert_child_token(Raw, IntegerLiteralExprSyntax::Cursor::Digits,
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tok::integer_literal);
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}
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RC<IntegerLiteralExprSyntaxData>
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IntegerLiteralExprSyntaxData::make(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent) {
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return RC<IntegerLiteralExprSyntaxData> {
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new IntegerLiteralExprSyntaxData {
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Raw, Parent, IndexInParent
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}
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};
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}
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RC<IntegerLiteralExprSyntaxData> IntegerLiteralExprSyntaxData::makeBlank() {
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auto Raw = RawSyntax::make(SyntaxKind::IntegerLiteralExpr,
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{
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TokenSyntax::missingToken(tok::oper_prefix, ""),
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TokenSyntax::missingToken(tok::integer_literal, "")
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},
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SourcePresence::Present);
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return make(Raw);
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}
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#pragma mark - integer-literal-expression API
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IntegerLiteralExprSyntax::
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IntegerLiteralExprSyntax(const RC<SyntaxData> Root,
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const IntegerLiteralExprSyntaxData *Data)
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: ExprSyntax(Root, Data) {}
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IntegerLiteralExprSyntax
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IntegerLiteralExprSyntax::withDigits(RC<TokenSyntax> NewDigits) const {
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assert(NewDigits->getTokenKind() == tok::integer_literal);
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return Data->replaceChild<IntegerLiteralExprSyntax>(NewDigits,
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Cursor::Digits);
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}
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