tor-browser

The Tor Browser
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private-static-setter-multiple-evaluations-of-class-realm.js (1823B)

      1 // Copyright (C) 2019 Caio Lima (Igalia SL). All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 description: Every new evaluation of a class creates a different Private Name (private static setter)
      6 esid: sec-runtime-semantics-evaluate-name
      7 info: |
      8  ClassTail : ClassHeritage { ClassBody }
      9    ...
     10    19. Let F be constructorInfo.[[Closure]].
     11    20. If ClassHeritage_opt is present and protoParent is not null, then set F.[[ConstructorKind]] to "derived".
     12    21. Perform MakeConstructor(F, false, proto).
     13    22. Perform MakeClassConstructor(F).
     14    ...
     15    33. If PrivateBoundIdentifiers of ClassBody contains a Private Name P such that P's [[Kind]] field is either "method" or "accessor" and P's [[Brand]] is F,
     16      a. PrivateBrandAdd(F, F).
     17    ...
     18 
     19  PrivateBrandCheck(O, P)
     20    1. If O.[[PrivateBrands]] does not contain an entry e such that SameValue(e, P.[[Brand]]) is true,
     21      a. Throw a TypeError exception.
     22 features: [class, class-static-methods-private, cross-realm]
     23 flags: [noStrict]
     24 ---*/
     25 
     26 let global1 = $262.createRealm().global;
     27 let global2 = $262.createRealm().global;
     28 let eval1 = global1.eval;
     29 let eval2 = global2.eval;
     30 
     31 let classStringExpression = `(
     32 class {
     33  static set #m(v) {
     34    this._v = v;
     35  }
     36 
     37  static access() {
     38    this.#m = 'test262';
     39  }
     40 }
     41 )`;
     42 
     43 let evalClass = function (_eval) {
     44  return _eval(classStringExpression);
     45 };
     46 
     47 let C1 = evalClass(eval1);
     48 let C2 = evalClass(eval2);
     49 
     50 C1.access();
     51 assert.sameValue(C1._v, 'test262');
     52 C2.access();
     53 assert.sameValue(C2._v, 'test262');
     54 
     55 assert.throws(global1.TypeError, function() {
     56  C1.access.call(C2);
     57 }, 'invalid access of C1 private static setter');
     58 
     59 assert.throws(global2.TypeError, function() {
     60  C2.access.call(C1);
     61 }, 'invalid access of C2 private static setter');
     62 
     63 reportCompare(0, 0);