[NFC] Rename 'SyntaxArena' to 'RawSyntaxArena'

The current `SyntaxArena` only manages `RawSyntax` green tree things. In
swift-syntax, "Syntax" refers to `Syntax` the red tree. So the naming was
a bit confusing.

Also rename `SyntaxArenaAllocated(Buffer)Pointer` to 'ArenaAllocated*'
in preparation for future introduction of other "arenas".

Author: rintaro

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

@@ -119,7 +119,7 @@ func rawSyntaxNodesFile(nodesStartingWith: [Character]) -> SourceFileSyntax {
           let element = node.elementChoices.only != nil ? node.elementChoices.only!.raw.syntaxType : "Element"
           DeclSyntax(
             """
-            public init(elements: [\(element)], arena: __shared SyntaxArena) {
+            public init(elements: [\(element)], arena: __shared RawSyntaxArena) {
               let raw = RawSyntax.makeLayout(
                 kind: .\(node.memberCallName), uninitializedCount: elements.count, arena: arena) { layout in
                   guard var ptr = layout.baseAddress else { return }
@@ -154,7 +154,7 @@ func rawSyntaxNodesFile(nodesStartingWith: [Character]) -> SourceFileSyntax {
               )
             }
 
-            FunctionParameterSyntax("arena: __shared SyntaxArena")
+            FunctionParameterSyntax("arena: __shared RawSyntaxArena")
           }
           try InitializerDeclSyntax("public init(\(params))") {
             if !node.children.isEmpty {

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

@@ -103,7 +103,7 @@ func syntaxNode(nodesStartingWith: [Character]) -> SourceFileSyntax {
             calledExpression: ExprSyntax("withExtendedLifetime"),
             leftParen: .leftParenToken(),
             arguments: LabeledExprListSyntax {
-              LabeledExprSyntax(expression: ExprSyntax("(SyntaxArena(), (\(parameters)))"))
+              LabeledExprSyntax(expression: ExprSyntax("(RawSyntaxArena(), (\(parameters)))"))
             },
             rightParen: .rightParenToken(),
             trailingClosure: ClosureExprSyntax(signature: closureSignature) {
@@ -163,7 +163,7 @@ func syntaxNode(nodesStartingWith: [Character]) -> SourceFileSyntax {
             AccessorDeclSyntax(
               """
               set(value) {
-                self = Syntax(self).replacingChild(at: \(raw: index), with: Syntax(value), arena: SyntaxArena()).cast(\(node.kind.syntaxType).self)
+                self = Syntax(self).replacingChild(at: \(raw: index), with: Syntax(value), arena: RawSyntaxArena()).cast(\(node.kind.syntaxType).self)
               }
               """
             )
@@ -192,7 +192,7 @@ func syntaxNode(nodesStartingWith: [Character]) -> SourceFileSyntax {
               @available(*, deprecated, message: "Use node.\(child.identifier).append(newElement) instead")
               public func add\(raw: childElt)(_ element: \(childEltType)) -> \(node.kind.syntaxType) {
                 var collection: RawSyntax
-                let arena = SyntaxArena()
+                let arena = RawSyntaxArena()
                 if let col = raw.layoutView!.children[\(raw: index)] {
                   collection = col.layoutView!.appending(element.raw, arena: arena)
                 } else {

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

@@ -38,7 +38,7 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
       /// The `SyntaxRewriter` subclass is responsible for generating the rewritten nodes. To incorporate them into the
       /// tree, all of the rewritten node's parents also need to be re-created. This is the arena in which those 
       /// intermediate nodes should be allocated.
-      private let arena: SyntaxArena?
+      private let arena: RawSyntaxArena?
       """
     )
 
@@ -54,7 +54,7 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
     DeclSyntax(
       """
       @_spi(RawSyntax)
-      public init(viewMode: SyntaxTreeViewMode = .sourceAccurate, arena: SyntaxArena? = nil) {
+      public init(viewMode: SyntaxTreeViewMode = .sourceAccurate, arena: RawSyntaxArena? = nil) {
         self.viewMode = viewMode
         self.arena = arena
       }
@@ -71,7 +71,7 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
         }
 
         return withExtendedLifetime(rewritten) {
-          return Syntax(node).replacingSelf(rewritten.raw, rawNodeArena: rewritten.raw.arenaReference.retained, allocationArena: SyntaxArena())
+          return Syntax(node).replacingSelf(rewritten.raw, rawNodeArena: rewritten.raw.arenaReference.retained, allocationArena: RawSyntaxArena())
         }
       }
       """
@@ -319,9 +319,9 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
         // nodes are being collected.
         var newLayout: UnsafeMutableBufferPointer<RawSyntax?> = .init(start: nil, count: 0)
 
-        // Keep 'SyntaxArena' of rewritten nodes alive until they are wrapped
+        // Keep 'RawSyntaxArena' of rewritten nodes alive until they are wrapped
         // with 'Syntax'
-        var rewrittens: ContiguousArray<RetainedSyntaxArena> = []
+        var rewrittens: ContiguousArray<RetainedRawSyntaxArena> = []
 
         for case let childDataRef? in node.layoutBuffer where viewMode.shouldTraverse(node: childDataRef.pointee.raw) {
 
@@ -347,11 +347,11 @@ let syntaxRewriterFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
         if newLayout.baseAddress != nil {
           // A child node was rewritten. Build the updated node.
 
-          let arena = self.arena ?? SyntaxArena()
+          let arena = self.arena ?? RawSyntaxArena()
           let newRaw = node.raw.layoutView!.replacingLayout(with: newLayout, arena: arena)
           newLayout.deinitialize()
           newLayout.deallocate()
-          // 'withExtendedLifetime' to keep 'SyntaxArena's of them alive until here.
+          // 'withExtendedLifetime' to keep 'RawSyntaxArena's of them alive until here.
           return withExtendedLifetime(rewrittens) {
             Syntax(raw: newRaw, rawNodeArena: arena)
           }

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

@@ -188,7 +188,7 @@ let triviaPiecesFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
 
     try FunctionDeclSyntax(
       """
-      static func make(_ piece: TriviaPiece, arena: SyntaxArena) -> RawTriviaPiece
+      static func make(_ piece: TriviaPiece, arena: RawSyntaxArena) -> RawTriviaPiece
       """
     ) {
       try SwitchExprSyntax("switch piece") {

Sources/SwiftIDEUtils/SyntaxClassifier.swift

@@ -126,7 +126,7 @@ private struct ClassificationVisitor {
     self.targetRange = range
     self.classifications = []
 
-    // `withExtendedLifetime` to make sure ``SyntaxArena`` for the node alive
+    // `withExtendedLifetime` to make sure ``RawSyntaxArena`` for the node alive
     // during the visit.
     withExtendedLifetime(node) {
       _ = self.visit(

Sources/SwiftParser/Attributes.swift

@@ -411,7 +411,7 @@ extension RawLabeledExprSyntax {
     identifier: RawTokenSyntax,
     _ unexpectedBetweenIdentifierAndTrailingComma: RawUnexpectedNodesSyntax? = nil,
     trailingComma: RawTokenSyntax? = nil,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       label: nil,

Sources/SwiftParser/CollectionNodes+Parsable.swift

@@ -20,7 +20,7 @@ fileprivate extension SyntaxCollection {
   static func parse(
     from parser: inout Parser,
     parse: (_ parser: inout Parser) -> some RawSyntaxNodeProtocol,
-    makeMissing: (_ remainingTokens: [RawSyntax], _ arena: SyntaxArena) -> some RawSyntaxNodeProtocol
+    makeMissing: (_ remainingTokens: [RawSyntax], _ arena: RawSyntaxArena) -> some RawSyntaxNodeProtocol
   ) -> Self {
     // Keep the parser alive so that the arena in which `raw` is allocated
     // doesn’t get deallocated before we have a chance to create a syntax node

Sources/SwiftParser/Nominals.swift

@@ -30,7 +30,7 @@ protocol NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   )
 
   static func parsePrimaryOrGenerics(_ parser: inout Parser) -> PrimaryOrGenerics?
@@ -48,7 +48,7 @@ extension RawProtocolDeclSyntax: NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       attributes: attributes,
@@ -82,7 +82,7 @@ extension RawClassDeclSyntax: NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       attributes: attributes,
@@ -116,7 +116,7 @@ extension RawActorDeclSyntax: NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       attributes: attributes,
@@ -150,7 +150,7 @@ extension RawStructDeclSyntax: NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       attributes: attributes,
@@ -184,7 +184,7 @@ extension RawEnumDeclSyntax: NominalTypeDeclarationTrait {
     inheritanceClause: RawInheritanceClauseSyntax?,
     genericWhereClause: RawGenericWhereClauseSyntax?,
     memberBlock: RawMemberBlockSyntax,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   ) {
     self.init(
       attributes: attributes,

Sources/SwiftParser/Parameters.swift

@@ -29,7 +29,7 @@ extension RawEnumCaseParameterSyntax: RawParameterTrait {}
 protocol RawParameterListTrait: RawSyntaxNodeProtocol {
   associatedtype ParameterSyntax: RawParameterTrait
 
-  init(elements: [ParameterSyntax], arena: __shared SyntaxArena)
+  init(elements: [ParameterSyntax], arena: __shared RawSyntaxArena)
 }
 
 extension RawFunctionParameterListSyntax: RawParameterListTrait {}
@@ -47,7 +47,7 @@ protocol RawParameterClauseTrait: RawSyntaxNodeProtocol {
     _ unexpectedBetweenParameterListAndRightParen: RawUnexpectedNodesSyntax?,
     rightParen: RawTokenSyntax,
     _ unexpectedAfterRightParen: RawUnexpectedNodesSyntax?,
-    arena: __shared SyntaxArena
+    arena: __shared RawSyntaxArena
   )
 }
 

Sources/SwiftParser/Parser.swift

@@ -91,7 +91,7 @@
 /// tokens as needed to disambiguate a parse. However, because lookahead
 /// operates on a copy of the lexical stream, no input tokens are lost..
 public struct Parser {
-  var arena: ParsingSyntaxArena
+  var arena: ParsingRawSyntaxArena
 
   /// A view of the sequence of lexemes in the input.
   var lexemes: Lexer.LexemeSequence
@@ -222,7 +222,7 @@ public struct Parser {
     buffer input: UnsafeBufferPointer<UInt8>,
     maximumNestingLevel: Int?,
     parseTransition: IncrementalParseTransition?,
-    arena: ParsingSyntaxArena?,
+    arena: ParsingRawSyntaxArena?,
     swiftVersion: SwiftVersion?,
     experimentalFeatures: ExperimentalFeatures
   ) {
@@ -231,7 +231,7 @@ public struct Parser {
       self.arena = arena
       precondition(arena.contains(text: SyntaxText(baseAddress: input.baseAddress, count: input.count)))
     } else {
-      self.arena = ParsingSyntaxArena(parseTriviaFunction: TriviaParser.parseTrivia)
+      self.arena = ParsingRawSyntaxArena(parseTriviaFunction: TriviaParser.parseTrivia)
       input = self.arena.internSourceBuffer(input)
     }
 
@@ -347,7 +347,7 @@ public struct Parser {
     _ input: UnsafeBufferPointer<UInt8>,
     maximumNestingLevel: Int? = nil,
     parseTransition: IncrementalParseTransition? = nil,
-    arena: ParsingSyntaxArena? = nil,
+    arena: ParsingRawSyntaxArena? = nil,
     swiftVersion: SwiftVersion? = nil,
     experimentalFeatures: ExperimentalFeatures
   ) {