[Swift] Drop support for swift 5.10

.github/workflows/build.yml

@@ -495,7 +495,7 @@ jobs:
     name: Test Swift Linux
     strategy:
       matrix:
-        swift: ["5.10", "6.1", "6.2"]
+        swift: ["6.0", "6.1", "6.2"]
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v6

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.10
+// swift-tools-version:6.0
 /*
  * Copyright 2020 Google Inc. All rights reserved.
  *
@@ -36,14 +36,17 @@ let package = Package(
     .target(
       name: "FlatBuffers",
       dependencies: ["Common"],
-      path: "swift/Sources/FlatBuffers"),
+      path: "swift/Sources/FlatBuffers",
+      swiftSettings: .settings),
     .target(
       name: "FlexBuffers",
       dependencies: ["Common"],
-      path: "swift/Sources/FlexBuffers"),
+      path: "swift/Sources/FlexBuffers",
+      swiftSettings: .settings),
     .target(
       name: "Common",
-      path: "swift/Sources/Common"),
+      path: "swift/Sources/Common",
+      swiftSettings: .settings),
     .testTarget(
       name: "FlatbuffersTests",
       dependencies: .dependencies,
@@ -52,7 +55,14 @@ let package = Package(
       name: "FlexbuffersTests",
       dependencies: ["FlexBuffers"],
       path: "tests/swift/Tests/Flexbuffers"),
-  ])
+  ],
+  swiftLanguageModes: [.v6])
+
+extension Array where Element == SwiftSetting {
+  static var settings: [SwiftSetting] {
+    [.enableUpcomingFeature("ExistentialAny")]
+  }
+}
 
 extension Array where Element == Package.Dependency {
   static var dependencies: [Package.Dependency] {

swift/Sources/FlatBuffers/ByteBuffer.swift

@@ -30,7 +30,7 @@ public struct ByteBuffer {
     enum Blob {
       #if !os(WASI)
       case data(Data)
-      case bytes(ContiguousBytes)
+      case bytes(any ContiguousBytes)
       #endif
 
       case byteBuffer(_InternalByteBuffer)

swift/Sources/FlatBuffers/FlatBufferBuilder.swift

@@ -488,7 +488,7 @@ public struct FlatBufferBuilder {
   ///
   /// - Parameter bytes: bytes to be written into the buffer
   /// - Returns: ``Offset`` of the vector
-  mutating public func createVector(bytes: ContiguousBytes) -> Offset {
+  mutating public func createVector(bytes: any ContiguousBytes) -> Offset {
     bytes.withUnsafeBytes {
       startVector($0.count, elementSize: MemoryLayout<UInt8>.size)
       _bb.push(bytes: $0)

swift/Sources/FlatBuffers/TableVerifier.swift

@@ -115,7 +115,7 @@ public struct TableVerifier {
     unionKeyName: String,
     fieldName: String,
     required: Bool,
-    completion: @escaping (inout Verifier, T, Int) throws -> Void) throws
+    completion: (inout Verifier, T, Int) throws -> Void) throws
     where T: UnionEnum
   {
     let keyPos = try dereference(key)

swift/Sources/FlatBuffers/Vectors/FlatbufferVector.swift

@@ -68,7 +68,7 @@ public struct FlatbufferVector<
 }
 
 extension FlatbufferVector: Encodable where Element: Encodable {
-  public func encode(to encoder: Encoder) throws {
+  public func encode(to encoder: any Encoder) throws {
     var container = encoder.unkeyedContainer()
     for element in self {
       try container.encode(element)

swift/Sources/FlatBuffers/Vectors/UnionFlatbufferVector.swift

@@ -49,8 +49,8 @@ public struct UnionFlatbufferVector {
 
   public subscript(
     position: Int,
-    Type: FlatbuffersVectorInitializable
-      .Type) -> FlatbuffersVectorInitializable
+    Type: any FlatbuffersVectorInitializable
+      .Type) -> any FlatbuffersVectorInitializable
   {
     guard position < count else {
       fatalError(

swift/Sources/FlatBuffers/_InternalByteBuffer.swift

@@ -146,7 +146,7 @@ struct _InternalByteBuffer {
   #if !os(WASI)
   @inline(__always)
   @usableFromInline
-  mutating func push(bytes: ContiguousBytes) {
+  mutating func push(bytes: any ContiguousBytes) {
     bytes.withUnsafeBytes { ptr in
       ensureSpace(size: ptr.count)
       memcpy(

swift/Sources/FlexBuffers/ByteBuffer.swift

@@ -30,7 +30,7 @@ public struct ByteBuffer {
     enum Blob {
       #if !os(WASI)
       case data(Data)
-      case bytes(ContiguousBytes)
+      case bytes(any ContiguousBytes)
       #endif
 
       case byteBuffer(_InternalByteBuffer)

swift/Sources/FlexBuffers/FlexBufferType.swift

@@ -16,7 +16,7 @@
 
 import Foundation
 
-public enum FlexBufferType: UInt64 {
+public enum FlexBufferType: UInt64, Sendable {
   case null = 0
   /// Variable width signed integer: `Int8, Int16, Int32, Int64`
   case int = 1

swift/Sources/FlexBuffers/Utils/BitWidth.swift

@@ -17,7 +17,7 @@
 import Foundation
 
 @usableFromInline
-enum BitWidth: UInt64, CaseIterable {
+enum BitWidth: UInt64, CaseIterable, Sendable {
   case w8 = 0
   case w16 = 1
   case w32 = 2

swift/Sources/FlexBuffers/Utils/Value.swift

@@ -20,10 +20,10 @@ import Foundation
 import Common
 #endif
 
-public struct Value: Equatable {
+public struct Value: Equatable, Sendable {
 
   @usableFromInline
-  enum Union: Equatable {
+  enum Union: Equatable, Sendable {
     case i(Int64)
     case u(UInt64)
     case f(Double)

swift/Sources/FlexBuffers/Writer/FlexBuffersWriter.swift

@@ -479,12 +479,12 @@ public struct FlexBuffersWriter {
   @inline(__always)
   public mutating func add(string: borrowing String, key: borrowing String) {
     add(key: key)
-    write(str: string, len: string.count)
+    write(str: string, len: string.utf8.count)
   }
 
   @inline(__always)
   public mutating func add(string: borrowing String) {
-    write(str: string, len: string.count)
+    write(str: string, len: string.utf8.count)
   }
 
   // MARK: - Writing Blobs
@@ -591,7 +591,7 @@ public struct FlexBuffersWriter {
   @discardableResult
   @inline(__always)
   private mutating func add(key: borrowing String) -> UInt {
-    add(key: key, len: key.count)
+    add(key: key, len: key.utf8.count)
   }
 
   @discardableResult
@@ -977,6 +977,9 @@ fileprivate struct Stack: RandomAccessCollection {
   mutating func removeAll(keepingCapacity keepCapacity: Bool = false) {
     count = 0
     if !keepCapacity {
+      let ptr = storage.memory
+      defer { ptr.deallocate() }
+
       capacity = Self.initialCapacity
       storage.memory = UnsafeMutableRawPointer.allocate(
         byteCount: capacity,