v8/test/mjsunit/deopt-recursive-lazy-once.js

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// Copyright 2017 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 --opt --no-always-opt
function foo(i, deopt = false) {
if (i == 0) {
if (deopt) {
// Trigger a lazy deopt.
%DeoptimizeNow();
}
} else {
foo(i - 1, deopt);
}
}
assertEquals(0, %GetOptimizationCount(foo));
assertEquals(0, %GetDeoptCount(foo));
foo(10);
foo(10);
%OptimizeFunctionOnNextCall(foo);
foo(10);
assertOptimized(foo);
assertEquals(1, %GetOptimizationCount(foo));
assertEquals(0, %GetDeoptCount(foo));
foo(10, true);
assertUnoptimized(foo);
assertEquals(1, %GetOptimizationCount(foo));
assertEquals(1, %GetDeoptCount(foo));