Fix Swift 6.3+ compatibility for generic protocol extensions

Sources/Frontend/Scan.swift

@@ -70,7 +70,7 @@ final class Scan {
         let indexLogger = logger.contextualized(with: "index")
         let plan = try driver.plan(logger: indexLogger)
         let syncSourceGraph = SynchronizedSourceGraph(graph: graph)
-        let pipeline = IndexPipeline(plan: plan, graph: syncSourceGraph, logger: indexLogger, configuration: configuration)
+        let pipeline = IndexPipeline(plan: plan, graph: syncSourceGraph, logger: indexLogger, configuration: configuration, swiftVersion: swiftVersion)
         try pipeline.perform()
         logger.endInterval(indexInterval)
     }

Sources/Indexer/IndexPipeline.swift

@@ -1,27 +1,31 @@
 import Configuration
 import Foundation
 import Logger
+import Shared
 import SourceGraph
 
 public struct IndexPipeline {
     private let plan: IndexPlan
     private let graph: SynchronizedSourceGraph
     private let logger: ContextualLogger
     private let configuration: Configuration
+    private let swiftVersion: SwiftVersion
 
-    public init(plan: IndexPlan, graph: SynchronizedSourceGraph, logger: ContextualLogger, configuration: Configuration) {
+    public init(plan: IndexPlan, graph: SynchronizedSourceGraph, logger: ContextualLogger, configuration: Configuration, swiftVersion: SwiftVersion) {
         self.plan = plan
         self.graph = graph
         self.logger = logger
         self.configuration = configuration
+        self.swiftVersion = swiftVersion
     }
 
     public func perform() throws {
         try SwiftIndexer(
             sourceFiles: plan.sourceFiles,
             graph: graph,
             logger: logger,
-            configuration: configuration
+            configuration: configuration,
+            swiftVersion: swiftVersion
         ).perform()
 
         if !plan.plistPaths.isEmpty {

Sources/Indexer/SwiftIndexer.swift

@@ -17,17 +17,20 @@ final class SwiftIndexer: Indexer {
     private let graph: SynchronizedSourceGraph
     private let logger: ContextualLogger
     private let configuration: Configuration
+    private let swiftVersion: SwiftVersion
 
     required init(
         sourceFiles: [SourceFile: [IndexUnit]],
         graph: SynchronizedSourceGraph,
         logger: ContextualLogger,
-        configuration: Configuration
+        configuration: Configuration,
+        swiftVersion: SwiftVersion
     ) {
         self.sourceFiles = sourceFiles
         self.graph = graph
         self.logger = logger.contextualized(with: "swift")
         self.configuration = configuration
+        self.swiftVersion = swiftVersion
         super.init(configuration: configuration)
     }
 
@@ -39,7 +42,8 @@ final class SwiftIndexer: Indexer {
                 retainAllDeclarations: isRetained(file),
                 graph: graph,
                 logger: logger,
-                configuration: configuration
+                configuration: configuration,
+                swiftVersion: swiftVersion
             )
         }
 
@@ -88,21 +92,24 @@ final class SwiftIndexer: Indexer {
         private let logger: ContextualLogger
         private let configuration: Configuration
         private var retainAllDeclarations: Bool
+        private let swiftVersion: SwiftVersion
 
         required init(
             sourceFile: SourceFile,
             units: [IndexUnit],
             retainAllDeclarations: Bool,
             graph: SynchronizedSourceGraph,
             logger: ContextualLogger,
-            configuration: Configuration
+            configuration: Configuration,
+            swiftVersion: SwiftVersion
         ) {
             self.sourceFile = sourceFile
             self.units = units
             self.retainAllDeclarations = retainAllDeclarations
             self.graph = graph
             self.logger = logger
             self.configuration = configuration
+            self.swiftVersion = swiftVersion
         }
 
         // swiftlint:disable nesting
@@ -242,7 +249,7 @@ final class SwiftIndexer: Indexer {
                 graph.addIndexedModules(sourceFile.modules)
             }
 
-            let multiplexingSyntaxVisitor = try MultiplexingSyntaxVisitor(file: sourceFile)
+            let multiplexingSyntaxVisitor = try MultiplexingSyntaxVisitor(file: sourceFile, swiftVersion: swiftVersion)
             let declarationSyntaxVisitor = multiplexingSyntaxVisitor.add(DeclarationSyntaxVisitor.self)
             let importSyntaxVisitor = multiplexingSyntaxVisitor.add(ImportSyntaxVisitor.self)
 

Sources/SyntaxAnalysis/DeclarationSyntaxVisitor.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Shared
 import SourceGraph
 import SwiftSyntax
 
@@ -24,6 +25,7 @@ public final class DeclarationSyntaxVisitor: PeripherySyntaxVisitor {
 
     private let sourceLocationBuilder: SourceLocationBuilder
     private let typeSyntaxInspector: TypeSyntaxInspector
+    private let swiftVersion: SwiftVersion
     private(set) var results: [Result] = []
 
     public var resultsByLocation: [Location: Result] {
@@ -32,8 +34,9 @@ public final class DeclarationSyntaxVisitor: PeripherySyntaxVisitor {
         }
     }
 
-    public init(sourceLocationBuilder: SourceLocationBuilder) {
+    public init(sourceLocationBuilder: SourceLocationBuilder, swiftVersion: SwiftVersion) {
         self.sourceLocationBuilder = sourceLocationBuilder
+        self.swiftVersion = swiftVersion
         typeSyntaxInspector = .init(sourceLocationBuilder: sourceLocationBuilder)
     }
 
@@ -113,11 +116,17 @@ public final class DeclarationSyntaxVisitor: PeripherySyntaxVisitor {
 
         if let memberType = node.extendedType.as(MemberTypeSyntax.self) {
             position = memberType.name.positionAfterSkippingLeadingTrivia
-        } else if let genericArgumentClause = node.extendedType.as(IdentifierTypeSyntax.self)?.genericArgumentClause {
-            // Generic protocol extensions in the form `extension Foo<Type>` have incorrect locations in the index store.
-            // This results in syntax metadata not being applied to the declaration due to the location mismatch. To
-            // workaround this, parse this node with the incorrect location.
-            position = genericArgumentClause.rightAngle.positionAfterSkippingLeadingTrivia
+        } else if let identifierType = node.extendedType.as(IdentifierTypeSyntax.self),
+                  let genericArgumentClause = identifierType.genericArgumentClause
+        {
+            if swiftVersion.version.isVersion(lessThanOrEqualTo: "6.2.3") {
+                // Swift <= 6.2.3: Generic protocol extensions in the form `extension Foo<Type>` have incorrect locations
+                // in the index store. This results in syntax metadata not being applied to the declaration due to the
+                // location mismatch. To workaround this, parse this node with the incorrect location.
+                position = genericArgumentClause.rightAngle.positionAfterSkippingLeadingTrivia
+            } else {
+                position = identifierType.name.positionAfterSkippingLeadingTrivia
+            }
         }
 
         parse(

Sources/SyntaxAnalysis/ImportSyntaxVisitor.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Shared
 import SourceGraph
 import SwiftSyntax
 
@@ -7,8 +8,9 @@ public final class ImportSyntaxVisitor: PeripherySyntaxVisitor {
 
     private let sourceLocationBuilder: SourceLocationBuilder
 
-    public init(sourceLocationBuilder: SourceLocationBuilder) {
+    public init(sourceLocationBuilder: SourceLocationBuilder, swiftVersion _: SwiftVersion) {
         self.sourceLocationBuilder = sourceLocationBuilder
+        // swiftVersion is not used in this visitor but is required by the protocol
     }
 
     public func visit(_ node: ImportDeclSyntax) {

Sources/SyntaxAnalysis/MultiplexingSyntaxVisitor.swift

@@ -1,11 +1,12 @@
 import Foundation
+import Shared
 import SourceGraph
 import SwiftParser
 import SwiftSyntax
 import SystemPackage
 
 public protocol PeripherySyntaxVisitor {
-    init(sourceLocationBuilder: SourceLocationBuilder)
+    init(sourceLocationBuilder: SourceLocationBuilder, swiftVersion: SwiftVersion)
 
     func visit(_ node: ActorDeclSyntax)
     func visit(_ node: ClassDeclSyntax)
@@ -95,20 +96,22 @@ public final class MultiplexingSyntaxVisitor: SyntaxVisitor {
     public let syntax: SourceFileSyntax
     public let locationConverter: SourceLocationConverter
     let sourceLocationBuilder: SourceLocationBuilder
+    let swiftVersion: SwiftVersion
 
     private var visitors: [PeripherySyntaxVisitor] = []
 
-    public required init(file: SourceFile) throws {
+    public required init(file: SourceFile, swiftVersion: SwiftVersion) throws {
         sourceFile = file
         let source = try String(contentsOf: file.path.url)
         syntax = Parser.parse(source: source)
         locationConverter = SourceLocationConverter(fileName: file.path.string, tree: syntax)
         sourceLocationBuilder = SourceLocationBuilder(file: file, locationConverter: locationConverter)
+        self.swiftVersion = swiftVersion
         super.init(viewMode: .sourceAccurate)
     }
 
     public func add<T: PeripherySyntaxVisitor>(_ visitorType: T.Type) -> T {
-        let visitor = visitorType.init(sourceLocationBuilder: sourceLocationBuilder)
+        let visitor = visitorType.init(sourceLocationBuilder: sourceLocationBuilder, swiftVersion: swiftVersion)
         visitors.append(visitor)
         return visitor
     }

Tests/PeripheryTests/Syntax/FunctionVisitTest.swift

@@ -1,4 +1,6 @@
 import Foundation
+import Logger
+import Shared
 @testable import SourceGraph
 @testable import SyntaxAnalysis
 @testable import TestShared
@@ -9,7 +11,9 @@ final class FunctionVisitTest: XCTestCase {
 
     override func setUpWithError() throws {
         try super.setUpWithError()
-        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath)
+        let shell = Shell(logger: Logger(quiet: true))
+        let swiftVersion = SwiftVersion(shell: shell)
+        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath, swiftVersion: swiftVersion)
         let visitor = multiplexingVisitor.add(DeclarationSyntaxVisitor.self)
         multiplexingVisitor.visit()
         results = visitor.resultsByLocation

Tests/PeripheryTests/Syntax/ImportVisitTest.swift

@@ -1,4 +1,6 @@
 import Foundation
+import Logger
+import Shared
 @testable import SourceGraph
 @testable import SyntaxAnalysis
 @testable import TestShared
@@ -9,7 +11,9 @@ final class ImportVisitTest: XCTestCase {
 
     override func setUpWithError() throws {
         try super.setUpWithError()
-        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath)
+        let shell = Shell(logger: Logger(quiet: true))
+        let swiftVersion = SwiftVersion(shell: shell)
+        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath, swiftVersion: swiftVersion)
         let visitor = multiplexingVisitor.add(ImportSyntaxVisitor.self)
         multiplexingVisitor.visit()
         results = visitor.importStatements

Tests/PeripheryTests/Syntax/PropertyVisitTest.swift

@@ -1,4 +1,6 @@
 import Foundation
+import Logger
+import Shared
 @testable import SourceGraph
 @testable import SyntaxAnalysis
 @testable import TestShared
@@ -9,7 +11,9 @@ final class PropertyVisitTest: XCTestCase {
 
     override func setUpWithError() throws {
         try super.setUpWithError()
-        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath)
+        let shell = Shell(logger: Logger(quiet: true))
+        let swiftVersion = SwiftVersion(shell: shell)
+        let multiplexingVisitor = try MultiplexingSyntaxVisitor(file: fixturePath, swiftVersion: swiftVersion)
         let visitor = multiplexingVisitor.add(DeclarationSyntaxVisitor.self)
         multiplexingVisitor.visit()
         results = visitor.resultsByLocation

Tests/Shared/SourceGraphTestCase.swift

@@ -55,11 +55,13 @@ open class SourceGraphTestCase: XCTestCase {
         }
 
         graph = SourceGraph(configuration: configuration, logger: logger)
+        let swiftVersion = SwiftVersion(shell: shell)
         let pipeline = IndexPipeline(
             plan: newPlan,
             graph: SynchronizedSourceGraph(graph: graph),
             logger: logger.contextualized(with: "index"),
-            configuration: configuration
+            configuration: configuration,
+            swiftVersion: swiftVersion
         )
         try! pipeline.perform()
 
@@ -68,7 +70,7 @@ open class SourceGraphTestCase: XCTestCase {
             graph: graph,
             logger: logger,
             configuration: configuration,
-            swiftVersion: SwiftVersion(shell: shell)
+            swiftVersion: swiftVersion
         ).perform()
         results = ScanResultBuilder.build(for: graph)
     }