kotlinx.atomicfu compiler plugin for JS_IR backend (#4581)

* kotlinx.atomicfu compiler plugin for JS_IR Support transformations of atomic operations introduced by the kotlinx.atomicfu library for the JS_IR backend. Compiler plugin is applied externally by the kotlinx.atomicfu gradle plugin. * Apply compiler plugin for JS platform only * New plugin test structure * testGroupOutputDirPrefix changed
2021-12-01 22:33:13 +03:00
parent 05695761ec
commit 93561a1a55
45 changed files with 2655 additions and 4 deletions
@@ -0,0 +1,71 @@
+import kotlinx.atomicfu.*
+import kotlin.test.*
+
+class LockFreeStackTest {
+
+    fun testClear() {
+        val s = LockFreeStack<String>()
+        check(s.isEmpty())
+        s.pushLoop("A")
+        check(!s.isEmpty())
+        s.clear()
+        check(s.isEmpty())
+    }
+
+    fun testPushPopLoop() {
+        val s = LockFreeStack<String>()
+        check(s.isEmpty())
+        s.pushLoop("A")
+        check(!s.isEmpty())
+        check(s.popLoop() == "A")
+        check(s.isEmpty())
+    }
+
+    fun testPushPopUpdate() {
+        val s = LockFreeStack<String>()
+        check(s.isEmpty())
+        s.pushUpdate("A")
+        check(!s.isEmpty())
+        check(s.popUpdate() == "A")
+        check(s.isEmpty())
+    }
+}
+
+class LockFreeStack<T> {
+    private val top = atomic<Node<T>?>(null)
+
+    private class Node<T>(val value: T, val next: Node<T>?)
+
+    fun isEmpty() = top.value == null
+
+    fun clear() { top.value = null }
+
+    fun pushLoop(value: T) {
+        top.loop { cur ->
+            val upd = Node(value, cur)
+            if (top.compareAndSet(cur, upd)) return
+        }
+    }
+
+    fun popLoop(): T? {
+        top.loop { cur ->
+            if (cur == null) return null
+            if (top.compareAndSet(cur, cur.next)) return cur.value
+        }
+    }
+
+    fun pushUpdate(value: T) {
+        top.update { cur -> Node(value, cur) }
+    }
+
+    fun popUpdate(): T? =
+        top.getAndUpdate { cur -> cur?.next } ?.value
+}
+
+fun box(): String {
+    val testClass = LockFreeStackTest()
+    testClass.testClear()
+    testClass.testPushPopLoop()
+    testClass.testPushPopUpdate()
+    return "OK"
+}