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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 modifyNext() {
'use strict';
var a = [];
var ai = a[Symbol.iterator]();
var original_next = ai.__proto__['next'];
function maxWithZero(...args) {
return Math.max(0, ...args);
}
function testMax(x, y) {
return maxWithZero(x, y);
}
testMax(1, 2);
testMax(1, 2);
%OptimizeFunctionOnNextCall(testMax);
var r = testMax(1, 2);
assertEquals(2, r);
var called = 0;
Object.defineProperty(ai.__proto__, 'next', {
get: function() {
called++;
return original_next;
}
});
var r2 = testMax(1, 2);
// .next() is only loaded once during the iteration prologue (see
// https://github.com/tc39/ecma262/pull/988/ and v8:6861)
assertEquals(1, called);
assertEquals(2, r2);
})();
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