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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.
(() => {
// From the lodash implementation.
function NaiveFilter() {
let index = -1
let resIndex = 0
const length = array == null ? 0 : array.length
const result = []
while (++index < length) {
const value = array[index]
if (func(value, index, array)) {
result[resIndex++] = value
}
}
return result
}
function NaiveFilterSetup() {
// Prime NaiveFilter with polymorphic cases.
array = [1, 2, 3];
NaiveFilter();
NaiveFilter();
array = [3.4]; NaiveFilter();
array = new Array(10); array[0] = 'hello'; NaiveFilter();
SmiSetup();
delete array[1];
}
// Make sure we inline the callback, pick up all possible TurboFan
// optimizations.
function RunOptFastFilter(multiple) {
// Use of variable multiple in the callback function forces
// context creation without escape analysis.
//
// Also, the arrow function requires inlining based on
// SharedFunctionInfo.
result = array.filter((v, i, a) => multiple === 3);
}
// Don't optimize because I want to optimize RunOptFastMap with a parameter
// to be used in the callback.
%NeverOptimizeFunction(OptFastFilter);
function OptFastFilter() { RunOptFastFilter(3); }
function side_effect(a) { return a; }
%NeverOptimizeFunction(side_effect);
function OptUnreliableFilter() {
result = array.filter(func, side_effect(array));
}
DefineHigherOrderTests([
// name, test function, setup function, user callback
"NaiveFilterReplacement", NaiveFilter, NaiveFilterSetup, v => true,
"DoubleFilter", mc("filter"), DoubleSetup, v => Math.floor(v) % 2 === 0,
"SmiFilter", mc("filter"), SmiSetup, v => v % 2 === 0,
"FastFilter", mc("filter"), FastSetup, (_, i) => i % 2 === 0,
"GenericFilter", mc("filter", true), ObjectSetup, (_, i) => i % 2 === 0,
"OptFastFilter", OptFastFilter, FastSetup, undefined,
"OptUnreliableFilter", OptUnreliableFilter, FastSetup, v => true
]);
})();
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