Source code
Revision control
Copy as Markdown
Other Tools
load(libdir + "asserts.js");
function testOptimized1() {
var obj = {};
var s = new Set([obj, undefined, 3.1415]);
for (var i = 0; i < 15; i++) {
var clone = new Set(s);
s.add(i); // Not added to `clone`.
s = clone;
}
assertEq(s.size, 3);
assertEq(s.has(obj), true);
assertEq(s.has(undefined), true);
assertEq(s.has(3.1415), true);
assertEq(Array.from(s).toString(), "[object Object],,3.1415");
return s;
}
testOptimized1();
function testOptimized2() {
var s = new Set();
for (var i = 0; i < 15; i++) {
s = new Set(s);
s.add(i);
}
assertEq(s.size, 15);
assertEq(Array.from(s).toString(), "0,1,2,3,4,5,6,7,8,9,10,11,12,13,14");
return s;
}
testOptimized2();
function testOtherProto() {
var s = new Set([1, 2, 3]);
Object.setPrototypeOf(s, null);
for (var i = 0; i < 15; i++) {
assertThrowsInstanceOf(() => new Set(s), TypeError);
}
}
testOtherProto();
function testOwnIteratorProp() {
var s = new Set([1, 2, 3]);
var c = 0;
s[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
for (var i = 0; i < 15; i++) {
assertEq(new Set(s).size, 0);
}
assertEq(c, 15);
}
testOwnIteratorProp();
function testCustomProtoIteratorProp() {
// Use a new global because this pops a realm fuse.
newGlobal().evaluate(`
var s = new Set([1, 2, 3]);
var c = 0;
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, true);
Set.prototype[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Set(s).size, 0);
}
assertEq(c, 15);
`);
}
testCustomProtoIteratorProp();
function testCustomProtoIteratorPropEmpty() {
newGlobal().evaluate(`
var s = new Set();
var c = 0;
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, true);
Set.prototype[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Set(s).size, 0);
}
assertEq(c, 15);
`);
}
testCustomProtoIteratorPropEmpty();
function testCustomIteratorNext() {
newGlobal().evaluate(`
var iterProto = Object.getPrototypeOf(new Set()[Symbol.iterator]());
var s = new Set([1, 2, 3]);
var c = 0;
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, true);
iterProto.next = function() {
c++;
return {done: true};
};
assertEq(getFuseState().OptimizeSetObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Set(s).size, 0);
}
assertEq(c, 15);
`);
}
testCustomIteratorNext();