1 files changed, 40 insertions, 0 deletions
diff --git a/deps/v8/test/js-perf-test/SuperIC/megamorphic-mixin.js b/deps/v8/test/js-perf-test/SuperIC/megamorphic-mixin.js
new file mode 100644
index 0000000000..bd59bba19e
--- /dev/null
+++ b/deps/v8/test/js-perf-test/SuperIC/megamorphic-mixin.js
@@ -0,0 +1,40 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const DETERMINISTIC_RUNS = 10000;
+new BenchmarkSuite(BENCHMARK_NAME, [1000], [
+  new Benchmark(BENCHMARK_NAME, false, false, DETERMINISTIC_RUNS,
+                runBenchmark)
+]);
+
+function createSubclass() {
+  class A { };
+  A.prototype.super_prop = 10;
+  class B extends A {
+    test() {
+      return super.super_prop;
+    }
+  };
+  return B;
+}
+
+const NO_CLASSES = 10;
+let objects = [];
+for (let i = 0; i < NO_CLASSES; ++i) {
+  const klass = createSubclass();
+  objects.push(new klass());
+}
+
+let ix = 0;
+const EXPECTED_VALUE = 10;
+
+function runBenchmark() {
+  const r = objects[ix].test();
+  if (r != EXPECTED_VALUE) {
+    throw new Error("Test error");
+  }
+  if (++ix == objects.length) {
+    ix = 0;
+  }
+}