v8/test/mjsunit/ic-lookup-on-receiver.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
(function TestLookupOnReceiver() {
let log = [];
function f(o, v) {
o.x = v;
return o.x;
}
let p = {};
Object.defineProperty(
p, "x",
{
get: function() { return 153; },
set: function(v) { log.push("set"); },
configurable: true
});
let o = Object.create(p);
// Turn o to dictionary mode.
for (let i = 0; i < 2048; i++) {
o["p"+i] = 0;
}
assertFalse(%HasFastProperties(o));
for (let i = 0; i < 5; i++) {
log.push(f(o, i));
}
Object.defineProperty(o, "x", { value: 0, configurable: true, writable: true});
for (let i = 0; i < 5; i++) {
log.push(f(o, 42 + i));
}
assertEquals(log,
["set", 153, "set", 153, "set", 153, "set", 153, "set", 153,
42, 43, 44, 45, 46]);
})();