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load(libdir + "asserts.js");
function testOptimized1() {
var obj = {};
var m = new Map([[obj, undefined], [undefined, obj], [3.1415, 123]]);
for (var i = 0; i < 15; i++) {
var clone = new Map(m);
m.set(i, i); // Not added to `clone`.
m = clone;
}
assertEq(m.size, 3);
assertEq(m.get(obj), undefined);
assertEq(m.get(undefined), obj);
assertEq(m.get(3.1415), 123);
assertEq(Array.from(m).toString(), "[object Object],,,[object Object],3.1415,123");
return m;
}
testOptimized1();
function testOptimized2() {
var m = new Map();
for (var i = 0; i < 15; i++) {
m = new Map(m);
m.set(i, i);
}
assertEq(m.size, 15);
assertEq(Array.from(m.keys()).toString(), "0,1,2,3,4,5,6,7,8,9,10,11,12,13,14");
return m;
}
testOptimized2();
function testOtherProto() {
var m = new Map([[1, 1], [2, 2]]);
Object.setPrototypeOf(m, null);
for (var i = 0; i < 15; i++) {
assertThrowsInstanceOf(() => new Map(m), TypeError);
}
}
testOtherProto();
function testOwnIteratorProp() {
var m = new Map([[1, 1], [2, 2]]);
var c = 0;
m[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
for (var i = 0; i < 15; i++) {
assertEq(new Map(m).size, 0);
}
assertEq(c, 15);
}
testOwnIteratorProp();
function testCustomProtoIteratorProp() {
// Use a new global because this pops a realm fuse.
newGlobal().evaluate(`
var m = new Map([[1, 1], [2, 2]]);
var c = 0;
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, true);
Map.prototype[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Map(m).size, 0);
}
assertEq(c, 15);
`);
}
testCustomProtoIteratorProp();
function testCustomProtoIteratorPropEmpty() {
newGlobal().evaluate(`
var m = new Map();
var c = 0;
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, true);
Map.prototype[Symbol.iterator] = function() {
c++;
return {next() { return {done: true}; }};
};
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Map(m).size, 0);
}
assertEq(c, 15);
`);
}
testCustomProtoIteratorPropEmpty();
function testCustomIteratorNext() {
newGlobal().evaluate(`
var iterProto = Object.getPrototypeOf(new Map()[Symbol.iterator]());
var m = new Map([[1, 1], [2, 2]]);
var c = 0;
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, true);
iterProto.next = function() {
c++;
return {done: true};
};
assertEq(getFuseState().OptimizeMapObjectIteratorFuse.intact, false);
for (var i = 0; i < 15; i++) {
assertEq(new Map(m).size, 0);
}
assertEq(c, 15);
`);
}
testCustomIteratorNext();