v8/test/mjsunit/compiler/test-literal-map-migration.js

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// Copyright 2021 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 f() {
let r = [];
let o1 = { x: 5 };
let o2 = { y: 5, inner: { n: 5 } };
r.push(o1);
r.push(o2);
return r;
}
%PrepareFunctionForOptimization(f);
{
let r = f();
f();
// Deprecate all the maps.
r[0].x = 5.5;
r[1].y = 5.5;
r[1].inner.n = 5.5;
}
// We will optimize despite deprecated maps in the boilerplates.
// until code finalization.
%OptimizeFunctionOnNextCall(f);
f();
assertOptimized(f);