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deps/v8/test/mjsunit/maglev/lazy-deopt-with-onstack-activation.js

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+// Copyright 2022 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.
+
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
+
+var x = 1;
+var do_change = {};
+do_change = false;
+
+function g() {
+  if (do_change) {
+    x = 2;
+    return 40;
+  }
+  return 30;
+}
+
+function f() {
+  return g() + x;
+}
+
+%PrepareFunctionForOptimization(f);
+assertEquals(31, f());
+
+%OptimizeMaglevOnNextCall(f);
+assertEquals(31, f());
+assertTrue(isMaglevved(f));
+
+// Trigger a lazy deopt on the next g() call.
+do_change = true;
+assertEquals(42, f());
+assertFalse(isMaglevved(f));
+assertUnoptimized(f);