38 lines
725 B
JavaScript
38 lines
725 B
JavaScript
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// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --allow-natives-syntax
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function f() {
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return r.test("abc");
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}
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function to_dict(o) {
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r.a = 42;
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r.b = 42;
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delete r.a;
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}
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function to_fast(o) {
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const obj = {};
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const obj2 = {};
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delete o.a;
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obj.__proto__ = o;
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obj[0] = 1;
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obj.__proto__ = obj2;
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delete obj[0];
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return o;
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}
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// Shrink the instance size by first transitioning to dictionary properties,
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// then back to fast properties.
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const r = /./;
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to_dict(r);
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to_fast(r);
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%PrepareFunctionForOptimization(f);
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assertTrue(f());
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%OptimizeFunctionOnNextCall(f);
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assertTrue(f());
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