[Swift] Migrating benchmarks to a newer lib. (#8168)

* Adds Nativestructs pointer push into ByteBuffer

Updates benchmarks & cleanup

Adds native struct vector tests

* Address PR comments

* Add more benchmarks

* Some benchmark cleanup

* Return back to 1M structs

* Tweak Structs benchmark

* Moves swift Benchmarks folder from /tests to /benchmarks

---------

Co-authored-by: Joakim Hassila <jocke@ordo.one>

tests/swift/benchmarks/Package.swift

@@ -1,34 +0,0 @@
-// swift-tools-version:5.1
-/*
- * Copyright 2020 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import PackageDescription
-
-let package = Package(
-  name: "benchmarks",
-  platforms: [
-    .macOS(.v10_14),
-  ],
-  dependencies: [
-    .package(path: "../../.."),
-    .package(url: "https://github.com/google/swift-benchmark", from: "0.1.0"),
-  ],
-  targets: [
-    .target(
-      name: "benchmarks",
-      dependencies: ["FlatBuffers",
-                     .product(name: "Benchmark", package: "swift-benchmark")]),
-  ])

tests/swift/benchmarks/Sources/benchmarks/main.swift

@@ -1,102 +0,0 @@
-/*
- * Copyright 2023 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import Benchmark
-import CoreFoundation
-import FlatBuffers
-
-benchmark("10Strings") {
-  var fb = FlatBufferBuilder(initialSize: 1<<20)
-  for _ in 0..<1_000_000 {
-    _ = fb.create(string: "foobarbaz")
-  }
-}
-
-benchmark("100Strings") {
-  var fb = FlatBufferBuilder(initialSize: 1<<20)
-  for _ in 0..<1_000_000 {
-    _ = fb.create(string: str)
-  }
-}
-
-benchmark("100Bytes") {
-  var fb = FlatBufferBuilder(initialSize: 1<<20)
-  for _ in 0..<1_000_000 {
-    _ = fb.createVector(bytes)
-  }
-}
-
-benchmark("100Bytes-ContiguousBytes") {
-  var fb = FlatBufferBuilder(initialSize: 1<<20)
-  for _ in 0..<1_000_000 {
-    _ = fb.createVector(bytes: bytes)
-  }
-}
-
-benchmark("FlatBufferBuilder.add") {
-  var fb = FlatBufferBuilder(initialSize: 1024 * 1024 * 32)
-  for _ in 0..<1_000_000 {
-    let off = fb.create(string: "T")
-    let s = fb.startTable(with: 4)
-    fb.add(element: 3.2, def: 0, at: 2)
-    fb.add(element: 4.2, def: 0, at: 4)
-    fb.add(element: 5.2, def: 0, at: 6)
-    fb.add(offset: off, at: 8)
-    _ = fb.endTable(at: s)
-  }
-}
-
-benchmark("structs") {
-  let structCount = 1_000_000
-
-  let rawSize = ((16 * 5) * structCount) / 1024
-
-  var fb = FlatBufferBuilder(initialSize: Int32(rawSize * 1600))
-
-  var offsets: [Offset] = []
-  for _ in 0..<structCount {
-    fb.startVector(
-      5 * MemoryLayout<AA>.size,
-      elementSize: MemoryLayout<AA>.alignment)
-    for _ in 0..<5 {
-      _ = fb.create(struct: AA(a: 2.4, b: 2.4))
-    }
-    let vector = fb.endVector(len: 5)
-    let start = fb.startTable(with: 1)
-    fb.add(offset: vector, at: 4)
-    offsets.append(Offset(offset: fb.endTable(at: start)))
-  }
-  let vector = fb.createVector(ofOffsets: offsets)
-  let start = fb.startTable(with: 1)
-  fb.add(offset: vector, at: 4)
-  let root = Offset(offset: fb.endTable(at: start))
-  fb.finish(offset: root)
-}
-
-let str = (0...99).map { _ -> String in "x" }.joined()
-let bytes: [UInt8] = Array(repeating: 42, count: 100)
-
-@usableFromInline
-struct AA: NativeStruct {
-  public init(a: Double, b: Double) {
-    self.a = a
-    self.b = b
-  }
-  var a: Double
-  var b: Double
-}
-
-Benchmark.main()

tests/swift/tests/Tests/FlatBuffers.Test.SwiftTests/FlatBuffersNanInfTests.swift

@@ -67,9 +67,9 @@ final class FlatBuffersNanInfTests: XCTestCase {
       let data = try encoder.encode(reader)
       let decoder = JSONDecoder()
       decoder.nonConformingFloatDecodingStrategy = .convertFromString(
-          positiveInfinity: "inf",
-          negativeInfinity: "-inf",
-          nan: "nan")
+        positiveInfinity: "inf",
+        negativeInfinity: "-inf",
+        nan: "nan")
       decoder.keyDecodingStrategy = .convertFromSnakeCase
       let value = try decoder.decode(Test.self, from: data)
       XCTAssertEqual(value.value, 100)

tests/swift/tests/Tests/FlatBuffers.Test.SwiftTests/FlatBuffersVectorsTests.swift

@@ -53,6 +53,26 @@ final class FlatBuffersVectors: XCTestCase {
     // swiftformat:enable all
   }
 
+  func testCreateStructArray() {
+    struct Vec: NativeStruct {
+      let x, y, z: Float32
+    }
+    let vector: [Vec] = [
+      Vec(x: 1, y: 2, z: 3),
+      Vec(x: 4, y: 5, z: 6),
+      Vec(x: 7, y: 8, z: 9),
+    ]
+    var b = FlatBufferBuilder(initialSize: 100)
+    let o = b.createVector(ofStructs: vector)
+    b.finish(offset: o)
+    vector.withUnsafeBytes { pointer in
+      print(Array(pointer))
+    }
+    // swiftformat:disable all
+    XCTAssertEqual(b.sizedByteArray, [4, 0, 0, 0, 3, 0, 0, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 128, 64, 0, 0, 160, 64, 0, 0, 192, 64, 0, 0, 224, 64, 0, 0, 0, 65, 0, 0, 16, 65])
+    // swiftformat:enable all
+  }
+
   func testCreateEmptyIntArray() {
     let numbers: [Int32] = []
     var b = FlatBufferBuilder(initialSize: 20)