v8/test/mjsunit/regress/regress-996161.js

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// Copyright 2019 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
function checkOwnProperties(v, count) {
var properties = Object.getOwnPropertyNames(v);
assertEquals(properties.length, count);
}
function testStoreNoFeedback() {
arr = new Int32Array(10);
function f(a) { a["-1"] = 15; }
for (var i = 0; i < 3; i++) {
arr.__defineGetter__("x", function() { });
checkOwnProperties(arr, 11);
f(arr);
}
}
testStoreNoFeedback();
function testStoreGeneric() {
arr = new Int32Array(10);
var index = "-1";
function f1(a) { a[index] = 15; }
%EnsureFeedbackVectorForFunction(f1);
// Make a[index] in f1 megamorphic
f1({a: 1});
f1({b: 1});
f1({c: 1});
f1({d: 1});
for (var i = 0; i < 3; i++) {
arr.__defineGetter__("x", function() { });
checkOwnProperties(arr, 11);
f1(arr);
}
}
testStoreGeneric();