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// Test implementation details when arguments object keep strong references
// to their elements.
function checkWeakRef(f, isCleared = true) {
let [wr, args] = f({});
assertEq(wr.deref() !== undefined, true);
clearKeptObjects();
gc();
// In an ideal world, the reference is always cleared. But in specific
// circumstances we're currently keeping the reference alive. Should this
// ever change, feel free to update this test case accordingly. IOW having
// |isCleared == false| is okay for spec correctness, but it isn't optimal.
assertEq(wr.deref() === undefined, isCleared);
}
checkWeakRef(function() {
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// Clear the reference from the arguments object.
arguments[0] = null;
// Let the arguments object escape.
return [wr, arguments];
});
checkWeakRef(function() {
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// Clear the reference from the arguments object.
Object.defineProperty(arguments, 0, {value: null});
// Let the arguments object escape.
return [wr, arguments];
});
checkWeakRef(function self() {
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// Delete operation doesn't clear the reference!
delete arguments[0];
// Let the arguments object escape.
return [wr, arguments];
}, /*isCleared=*/ false);
checkWeakRef(function() {
"use strict";
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// Clear the reference from the arguments object.
arguments[0] = null;
// Let the arguments object escape.
return [wr, arguments];
});
checkWeakRef(function() {
"use strict";
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// This define operation doesn't clear the reference!
Object.defineProperty(arguments, 0, {value: null});
// Let the arguments object escape.
return [wr, arguments];
}, /*isCleared=*/ false);
checkWeakRef(function() {
"use strict";
// Create a weak-ref for the first argument.
let wr = new WeakRef(arguments[0]);
// Delete operation doesn't clear the reference!
delete arguments[0];
// Let the arguments object escape.
return [wr, arguments];
}, /*isCleared=*/ false);