[K/N] Benchmarks on weak references

Merge-request: KT-MR-7575
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/performance/swiftinterop/build.gradle.kts

@@ -17,7 +17,11 @@ swiftBenchmark {
     applicationName = "swiftInterop"
     commonSrcDirs = listOf("$toolsPath/benchmarks/shared/src/main/kotlin/report", "src", "../shared/src/main/kotlin")
     nativeSrcDirs = listOf("../shared/src/main/kotlin-native/common", "../shared/src/main/kotlin-native/posix")
-    swiftSources = listOf("$projectDir/swiftSrc/benchmarks.swift", "$projectDir/swiftSrc/main.swift")
+    swiftSources = listOf(
+        "$projectDir/swiftSrc/benchmarks.swift",
+        "$projectDir/swiftSrc/main.swift",
+        "$projectDir/swiftSrc/weakRefBenchmarks.swift",
+    )
     compileTasks = listOf("compileKotlinNative", "linkBenchmark${buildType.name.toLowerCase().capitalize()}FrameworkNative")
     cleanBeforeRunTask = "compileKotlinNative"
-}
+}

kotlin-native/performance/swiftinterop/src/main/kotlin/org/jetbrains/GC.kt

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package org.jetbrains.gc
+
+import kotlin.native.internal.GC
+
+fun collect() = GC.collect()
+fun schedule() = GC.schedule()

kotlin-native/performance/swiftinterop/src/main/kotlin/org/jetbrains/model/Data.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package org.jetbrains.model
+
+import org.jetbrains.benchmarksLauncher.Random
+
+class KotlinData(var x: Int = Random.nextInt())

kotlin-native/performance/swiftinterop/swiftSrc/main.swift

@@ -36,6 +36,28 @@ swiftLauncher.addBase(name: "createMultigraphOfInt", benchmark: companion.create
         lambda: { ($0 as! SwiftInteropBenchmarks).stringInterop() }))
     swiftLauncher.addBase(name: "simpleFunction", benchmark: companion.create(ctor: { return SwiftInteropBenchmarks() },
         lambda: { ($0 as! SwiftInteropBenchmarks).simpleFunction() }))
+swiftLauncher.addBase(
+    name: "WeakRefBenchmark.aliveReference",
+    benchmark: BenchmarkEntryWithInit.companion.create(
+        ctor: { return WeakRefBenchmark() },
+        lambda: { ($0 as! WeakRefBenchmark).aliveReference() }
+    )
+)
+swiftLauncher.addBase(
+    name: "WeakRefBenchmark.deadReference",
+    benchmark: BenchmarkEntryWithInit.companion.create(
+        ctor: { return WeakRefBenchmark() },
+        lambda: { ($0 as! WeakRefBenchmark).deadReference() }
+    )
+)
+swiftLauncher.addBase(
+    name: "WeakRefBenchmark.dyingReference",
+    benchmark: BenchmarkEntryWithInit.companion.create(
+        ctor: { return WeakRefBenchmark() },
+        lambda: { ($0 as! WeakRefBenchmark).dyingReference() }
+    )
+)
+
 runner.runBenchmarks(args: args, run: { (arguments: BenchmarkArguments) -> [BenchmarkResult] in
     if arguments is BaseBenchmarkArguments {
         let argumentsList: BaseBenchmarkArguments = arguments as! BaseBenchmarkArguments
@@ -50,4 +72,4 @@ runner.runBenchmarks(args: args, run: { (arguments: BenchmarkArguments) -> [Benc
     return runner.parse(args: args, benchmarksListAction: { (baseOnly: KotlinBoolean) in swiftLauncher.benchmarksListAction(baseOnly: baseOnly.boolValue) }) },
   collect: { (benchmarks: [BenchmarkResult], arguments: BenchmarkArguments) -> Void in
     runner.collect(results: benchmarks, arguments: arguments)
-}, benchmarksListAction: { (baseOnly: KotlinBoolean) in swiftLauncher.benchmarksListAction(baseOnly: baseOnly.boolValue) })
+}, benchmarksListAction: { (baseOnly: KotlinBoolean) in swiftLauncher.benchmarksListAction(baseOnly: baseOnly.boolValue) })

kotlin-native/performance/swiftinterop/swiftSrc/weakRefBenchmarks.swift

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+import Foundation
+import benchmark
+
+private let REPEAT_COUNT = 10000
+private let REFERENCES_COUNT = 3
+
+private class ReferenceWrapper {
+    private weak var weakRef: KotlinData?
+    private var strongRef: KotlinData?
+
+    init() {
+        let data = KotlinData(x: Int32.random(in: 1 ... 1000))
+        self.strongRef = data
+        self.weakRef = data
+    }
+
+    // This function must not be inlined. We must ensure `weakRef` is accessed at each loop iteration.
+    @inline(never) func value() -> Int32 {
+        let ref: KotlinData? = self.weakRef
+        if ref == nil {
+            return 0
+        }
+        return ref!.x
+    }
+
+    func dispose() {
+        self.strongRef = nil
+    }
+
+    func stress() -> Int32 {
+        var counter: Int32 = 0
+        for _ in 1...REPEAT_COUNT {
+            counter += self.value()
+        }
+        return counter
+    }
+}
+
+private func deadReferenceWrapper() -> ReferenceWrapper {
+    let ref = ReferenceWrapper()
+    ref.dispose()
+    GCKt.collect()
+    return ref
+}
+
+class WeakRefBenchmark {
+    private let aliveRef = ReferenceWrapper()
+    private let deadRef = deadReferenceWrapper()
+
+    // Access alive reference.
+    func aliveReference() {
+        let counter = aliveRef.stress()
+        if counter == 0 {
+            fatalError()
+        }
+    }
+
+    // Access dead reference.
+    func deadReference() {
+        let counter = deadRef.stress()
+        if counter != 0 {
+            fatalError()
+        }
+    }
+
+    // Access reference that is nulled out in the middle.
+    func dyingReference() {
+        let ref = ReferenceWrapper()
+
+        ref.dispose()
+        GCKt.schedule()
+
+        let counter = ref.stress()
+        Blackhole.companion.consume(value: counter)
+    }
+}