1062340 - Visit every property in Object.{isSealed, isFrozen} on proxy

Status: RESOLVED DUPLICATE of bug 1120512

(Core :: JavaScript Engine, defect)

Description

[André Bargull [:anba]]

TestIntegrityLevel [1] does not stop property traversal when a writable or configurable property was found. 

[1] https://people.mozilla.org/~jorendorff/es6-draft.html#sec-testintegritylevel

Test cases:

Expected: Calls getOwnPropertyDescriptor for both properties
Actual: getOwnPropertyDescriptor only called for the first property


Test Object.isFrozen and configurable property:

  var p = new Proxy(Object.preventExtensions(Object.defineProperties({}, {
    a: {configurable: true},
    b: {configurable: false},
  })), {
    getOwnPropertyDescriptor(t, pk) {
      print(`getOwnPropertyDescriptor: pk=${pk}`);
      return Object.getOwnPropertyDescriptor(t, pk);
    }
  });
  Object.isFrozen(p);


Test Object.isFrozen and writable property:

  var p = new Proxy(Object.preventExtensions(Object.defineProperties({}, {
    a: {writable: true},
    b: {configurable: false},
  })), {
    getOwnPropertyDescriptor(t, pk) {
      print(`getOwnPropertyDescriptor: pk=${pk}`);
      return Object.getOwnPropertyDescriptor(t, pk);
    }
  });
  Object.isFrozen(p);


Test Object.isSealed and configurable property:

  var p = new Proxy(Object.preventExtensions(Object.defineProperties({}, {
    a: {configurable: true},
    b: {configurable: false},
  })), {
    getOwnPropertyDescriptor(t, pk) {
      print(`getOwnPropertyDescriptor: pk=${pk}`);
      return Object.getOwnPropertyDescriptor(t, pk);
    }
  });
  Object.isSealed(p);