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deps/v8/test/mjsunit/maglev/lazy-deopt-without-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;
+
+function f(o) {
+  return x;
+}
+
+%PrepareFunctionForOptimization(f);
+assertEquals(1, f());
+
+%OptimizeMaglevOnNextCall(f);
+assertEquals(1, f());
+assertTrue(isMaglevved(f));
+
+// Trigger a lazy deopt now, so that f() deopts on its next call.
+x = 2;
+assertFalse(isMaglevved(f));
+assertUnoptimized(f);
+assertEquals(2, f());