Add Sendable conformances to the SwiftSyntax module

Author: ahoppen

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/KeywordFile.swift

@@ -24,7 +24,7 @@ let lookupTable = ArrayExprSyntax(leftSquare: .leftSquareToken(trailingTrivia: .
 let keywordFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
   try! EnumDeclSyntax(
     """
-    public enum Keyword: UInt8, Hashable
+    public enum Keyword: UInt8, Hashable, Sendable
     """
   ) {
     for keyword in Keyword.allCases {

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/SyntaxEnumFile.swift

@@ -19,7 +19,7 @@ let syntaxEnumFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
   try! EnumDeclSyntax(
     """
     /// Enum to exhaustively switch over all different syntax nodes.
-    public enum SyntaxEnum
+    public enum SyntaxEnum: Sendable
     """
   ) {
     DeclSyntax("case token(TokenSyntax)")

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/SyntaxKindFile.swift

@@ -19,7 +19,7 @@ let syntaxKindFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
   try! EnumDeclSyntax(
     """
     /// Enumerates the known kinds of Syntax represented in the Syntax tree.
-    public enum SyntaxKind
+    public enum SyntaxKind: Sendable
     """
   ) {
     DeclSyntax("case token")

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/TokenKindFile.swift

@@ -19,7 +19,7 @@ let tokenKindFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
   try! EnumDeclSyntax(
     """
     /// Enumerates the kinds of tokens in the Swift language.
-    public enum TokenKind: Hashable
+    public enum TokenKind: Hashable, Sendable
     """
   ) {
     for tokenSpec in Token.allCases.map(\.spec) {

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/TriviaPiecesFile.swift

@@ -26,7 +26,7 @@ let triviaPiecesFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
     ///
     /// In general, you should deal with the actual Trivia collection instead
     /// of individual pieces whenever possible.
-    public enum TriviaPiece
+    public enum TriviaPiece: Sendable
     """
   ) {
     for trivia in TRIVIAS {
@@ -176,7 +176,7 @@ let triviaPiecesFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
     /// In contrast to ``TriviaPiece``, a ``RawTriviaPiece`` does not own the source
     /// text of the trivia.
     @_spi(RawSyntax)
-    public enum RawTriviaPiece: Equatable
+    public enum RawTriviaPiece: Equatable, Sendable
     """
   ) {
     for trivia in TRIVIAS {

Sources/SwiftParser/CollectionNodes+Parsable.swift

@@ -45,7 +45,7 @@ fileprivate extension SyntaxCollection {
     } else {
       // First unwrap: We know that children.last exists because children is not empty
       // Second unwrap: This is a collection and collections never have optional children. Thus the last child can’t be nil.
-      let lastWithRemainder = parser.parseRemainder(into: layoutView.children.last!!)
+      let lastWithRemainder = parser.parseRemainder(into: layoutView.children[layoutView.children.count - 1]!)
       let raw = layoutView.replacingChild(at: layoutView.children.count - 1, with: lastWithRemainder, arena: parser.arena)
       return Syntax(raw: raw, rawNodeArena: parser.arena).cast(Self.self)
     }

Sources/SwiftSyntax/AbsolutePosition.swift

@@ -12,7 +12,7 @@
 
 /// An absolute position in a source file as text - the absolute utf8Offset from
 /// the start of the file.
-public struct AbsolutePosition: Comparable, Hashable {
+public struct AbsolutePosition: Comparable, Hashable, Sendable {
   public let utf8Offset: Int
 
   static let startOfFile = AbsolutePosition(utf8Offset: 0)

Sources/SwiftSyntax/AbsoluteRawSyntax.swift

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-struct AbsoluteRawSyntax {
+struct AbsoluteRawSyntax: Sendable {
   let raw: RawSyntax
   let info: AbsoluteSyntaxInfo
 

Sources/SwiftSyntax/AbsoluteSyntaxInfo.swift

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-struct AbsoluteSyntaxPosition {
+struct AbsoluteSyntaxPosition: Sendable {
   /// The UTF-8 offset of the syntax node in the source file
   let offset: UInt32
   let indexInParent: UInt32
@@ -32,7 +32,7 @@ struct AbsoluteSyntaxPosition {
 
 /// `AbsoluteSyntaxInfo` represents the information that relates a `RawSyntax`
 /// to a source file tree, like its absolute source offset.
-struct AbsoluteSyntaxInfo {
+struct AbsoluteSyntaxInfo: Sendable {
   let position: AbsoluteSyntaxPosition
   let nodeId: SyntaxIdentifier
 

Sources/SwiftSyntax/CMakeLists.txt

@@ -23,6 +23,7 @@ add_swift_syntax_library(SwiftSyntax
   SwiftSyntaxCompatibility.swift
   Syntax.swift
   SyntaxArena.swift
+  SyntaxArenaAllocatedBuffer.swift
   SyntaxChildren.swift
   SyntaxCollection.swift
   SyntaxHashable.swift