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LibJS: Disallow changing the prototype of non-extensible objects

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Object::set_prototype() now returns a boolean indicating success.
Setting the prototype to an identical object is always considered
successful, even if the object is non-extensible.
This commit is contained in:
Linus Groh 2020-06-02 12:32:54 +01:00 • committed by Andreas Kling
parent 8cf1ded478
commit b958e4f573
4 changed files with 22 additions and 6 deletions
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12
Libraries/LibJS/Tests/Object.setPrototypeOf.js
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@ -11,7 +11,17 @@ try {
});
o = {};
assert(Object.setPrototypeOf(o, {}) === o);
p = {};
assert(Object.setPrototypeOf(o, p) === o);
Object.preventExtensions(o);
assertThrowsError(() => {
Object.setPrototypeOf(o, {});
}, {
error: TypeError,
message: "Can't set prototype of non-extensible object"
});
assert(Object.setPrototypeOf(o, p) === o);
console.log("PASS");
} catch (e) {