v8/test/mjsunit/for-in-special-cases.js
Shiyu Zhang 206b59c719 [runtime] Handle element in for-in fast path that uses PrototypeInfo cache
This can speed up the below micro-bench by 3x and improve JetStream2-tagcloud-SP case by ~2%.

Object.prototype.foo = function() {};
let array = ['a','b','c','d','e'];
let start = Date.now();
for (let i = 0; i < 1e5; i++) {
	for (let j in array) {}
}
console.log(Date.now() - start);

Contributed by tao.pan@intel.com

Change-Id: I44c948c2e4c28b8e42192f36802a5ea0f82bbe25
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2049903
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Shiyu Zhang <shiyu.zhang@intel.com>
Cr-Commit-Position: refs/heads/master@{#66362}
2020-02-20 08:37:38 +00:00

358 lines
10 KiB
JavaScript

// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --expose-gc
function for_in_null() {
try {
for (var x in null) {
return false;
}
} catch(e) {
return false;
}
return true;
}
function for_in_undefined() {
try {
for (var x in undefined) {
return false;
}
} catch(e) {
return false;
}
return true;
}
for (var i = 0; i < 10; ++i) {
assertTrue(for_in_null());
gc();
}
for (var j = 0; j < 10; ++j) {
assertTrue(for_in_undefined());
gc();
}
assertEquals(10, i);
assertEquals(10, j);
function Accumulate(x) {
var accumulator = [];
for (var i in x) {
accumulator.push(i);
}
return accumulator;
}
for (var i = 0; i < 3; ++i) {
assertEquals(Accumulate("abcd"), ['0', '1', '2', '3']);
}
function for_in_string_prototype() {
var x = new String("abc");
x.foo = 19;
function B() {
this.bar = 5;
this[7] = 4;
}
B.prototype = x;
var y = new B();
y.gub = 13;
var elements = Accumulate(y);
var elements1 = Accumulate(y);
// If for-in returns elements in a different order on multiple calls, this
// assert will fail. If that happens, consider if that behavior is OK.
assertEquals(elements, elements1, "For-in elements not the same both times.");
assertEquals(["7","bar","gub","0","1","2","foo"], elements)
assertEquals(['0', '1', '2', 'foo'], Accumulate(x))
}
for_in_string_prototype();
for_in_string_prototype();
(function for_in_dictionary_prototype_1() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = Object.create(null, {
prop: {enumerable: false, configurable: true, value: 0},
});
Object.setPrototypeOf(derived1, prototype1);
let prototype2 = {prop: 0, prop1: 1};
let derived2 = Object.create(prototype2, {
prop: {enumerable: false, configurable: true, value: 0},
});
for (let i = 0; i < 3; i++) {
assertEquals(['prop1'], Accumulate(derived1));
assertEquals(['prop1'], Accumulate(derived2));
}
})();
(function for_in_dictionary_prototype_2() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = Object.create(null, {
prop: {enumerable: false, configurable: true, value: 1},
prop2: {enumerable: true, configurable: true, value: 2},
prop3: {enumerable: false, configurable: true, value: 3},
});
Object.setPrototypeOf(derived1, prototype1);
let prototype2 = {prop: 0, prop1: 1};
let derived2 = Object.create(prototype2, {
prop: {enumerable: false, configurable: true, value: 0},
prop2: {enumerable: true, configurable: true, value: 2},
prop3: {enumerable: false, configurable: true, value: 3},
});
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop1'], Accumulate(derived1));
assertEquals(['prop2', 'prop1'], Accumulate(derived2));
}
})();
(function for_in_prototype_itself_change() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = {prop2: 2, prop3: 3};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop', 'prop1'], Accumulate(derived1));
}
prototype1.prop3 = 3;
let derived2 = {prop4: 4, prop5: 5};
Object.setPrototypeOf(derived2, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop4', 'prop5', 'prop', 'prop1', 'prop3'], Accumulate(derived2));
}
})();
(function for_in_prototype_change_property() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = {prop2: 2, prop3: 3};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop', 'prop1'], Accumulate(derived1));
}
prototype1.__proto__ = {prop4: 4, prop5: 5};
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop', 'prop1', 'prop4', 'prop5'], Accumulate(derived1));
}
derived1.__proto__ = {prop6: 6, prop7: 7};
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop6', 'prop7'], Accumulate(derived1));
}
})();
(function for_in_prototype_change_element1() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = {prop2: 2, prop3: 3};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop', 'prop1'], Accumulate(derived1));
}
prototype1[0] = 4;
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', '0', 'prop', 'prop1'], Accumulate(derived1));
}
derived1.__proto__ = {1: 1, 3: 3};
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', '1', '3'], Accumulate(derived1));
}
})();
(function for_in_prototype_change_element2() {
Array.prototype.__proto__ = {'A': 1};
let array = ['a', 'b', 'c', 'd', 'e'];
for (let i = 0; i < 3; i++) {
assertEquals(['0', '1', '2', '3', '4', 'A'], Accumulate(array));
}
Array.prototype[10] = 'b';
for (let i = 0; i < 3; i++) {
assertEquals(['0', '1', '2', '3', '4', '10', 'A'], Accumulate(array));
}
})();
(function for_in_prototype_change_element3() {
let prototype = {prop: 0};
let holey_array = {
1: 'a',
get 3() {
delete this[5];
return 'b';
},
5: 'c'
};
Object.setPrototypeOf(holey_array, prototype);
for (let i = 0; i < 3; i++) {
assertEquals(['1', '3', '5', 'prop'], Accumulate(holey_array));
}
prototype[10] = 'b';
for (let i = 0; i < 3; i++) {
assertEquals(['1', '3', '5', '10', 'prop'], Accumulate(holey_array));
}
for (let i = 0; i < 3; i++) {
var accumulator = [];
for (var j in holey_array) {
accumulator.push(j);
holey_array[j];
}
assertEquals(['1', '3', '10', 'prop'], accumulator);
}
})();
(function for_in_prototype_change_element4() {
let prototype = {
1: 'a',
get 3() {
delete this[5];
return 'b';
},
5: 'c',
};
let holey_array = {7: 'd', 9: 'e'};
Object.setPrototypeOf(holey_array, prototype);
for (let i = 0; i < 3; i++) {
assertEquals(['7', '9', '1', '3', '5'], Accumulate(holey_array));
}
prototype.prop = 0;
for (let i = 0; i < 3; i++) {
assertEquals(['7', '9', '1', '3', '5', 'prop'], Accumulate(holey_array));
}
for (let i = 0; i < 3; i++) {
var accumulator = [];
for (var j in holey_array) {
accumulator.push(j);
prototype[j];
}
assertEquals(['7', '9', '1', '3', 'prop'], accumulator);
}
})();
(function for_in_non_enumerable1() {
let prototype1 = {prop: 0};
let derived1 = Object.create(prototype1, {
prop1: {enumerable: false, configurable: true, value: 1},
});
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop'], Accumulate(derived1));
}
let derived2 = {prop2: 2};
Object.setPrototypeOf(derived2, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop'], Accumulate(derived2));
}
})();
(function for_in_non_enumerable2() {
let prototype1 = {prop: 0};
let derived1 = {prop1: 1};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop1', 'prop'], Accumulate(derived1));
}
let derived2 = Object.create(prototype1, {
prop: {enumerable: false, configurable: true, value: 0},
prop2: {enumerable: true, configurable: true, value: 2}
});
for (let i = 0; i < 3; i++) {
assertEquals(['prop2'], Accumulate(derived2));
}
})();
(function for_in_same_key1() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = {prop: 0, prop2: 1};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop', 'prop2', 'prop1'], Accumulate(derived1));
}
let derived2 = {prop3: 3, prop4: 4};
Object.setPrototypeOf(derived2, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop3', 'prop4', 'prop', 'prop1'], Accumulate(derived2));
}
})();
(function for_in_same_key2() {
let prototype1 = {prop: 0, prop1: 1};
let derived1 = {prop2: 2, prop3: 3};
Object.setPrototypeOf(derived1, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop2', 'prop3', 'prop', 'prop1'], Accumulate(derived1));
}
let derived2 = {prop: 0, prop4: 4};
Object.setPrototypeOf(derived2, prototype1);
for (let i = 0; i < 3; i++) {
assertEquals(['prop', 'prop4', 'prop1'], Accumulate(derived2));
}
})();
(function for_in_redefine_property() {
Object.prototype.prop = 0;
let object1 = {prop1: 1, prop2: 2};
for (let i = 0; i < 3; i++) {
assertEquals(['prop1', 'prop2', 'prop'], Accumulate(object1));
}
let object2 = {prop3: 3, prop4: 4};
Object.defineProperty(object2,
'prop', {enumerable: false, configurable: true, value: 0});
for (let i = 0; i < 3; i++) {
assertEquals(['prop3', 'prop4'], Accumulate(object2));
}
})();
(function for_in_empty_property() {
let prototype1 = {prop: 0};
let derived1 = Object.create(prototype1, {
prop: {enumerable: false, configurable: true, value: 0}
});
for (let i = 0; i < 3; i++) {
assertEquals([], Accumulate(derived1));
}
})();