1d29d81c69
PR-URL: https://github.com/nodejs/node/pull/52293 Reviewed-By: Moshe Atlow <moshe@atlow.co.il> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
28 lines
618 B
JavaScript
28 lines
618 B
JavaScript
// Copyright 2024 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 --maglev
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const a = [1, 2, 3]
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function foo(i) {
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return a[i];
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}
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// Setting a negative index does not violate the NoElements protector.
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Array.prototype[-1] = "Uh!";
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%PrepareFunctionForOptimization(foo);
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foo(0);
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foo(5);
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%OptimizeMaglevOnNextCall(foo);
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foo(0);
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foo(7); // It is able to read out of bounds.
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assertTrue(isOptimized(foo));
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foo(-1); // Deopt, since index is negative.
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assertTrue(!isOptimized(foo));
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