var-env-func-init-global-update-configurable.js (1447B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-evaldeclarationinstantiation 5 description: Modification of previously-existing configurable global property 6 info: | 7 [...] 8 15. For each production f in functionsToInitialize, do 9 a. Let fn be the sole element of the BoundNames of f. 10 b. Let fo be the result of performing InstantiateFunctionObject for f 11 with argument lexEnv. 12 c. If varEnvRec is a global Environment Record, then 13 i. Perform ? varEnvRec.CreateGlobalFunctionBinding(fn, fo, true). 14 [...] 15 16 8.1.1.4.18 CreateGlobalFunctionBinding 17 18 [...] 19 5. If existingProp is undefined or existingProp.[[Configurable]] is true, 20 then 21 a. Let desc be the PropertyDescriptor{[[Value]]: V, [[Writable]]: true, 22 [[Enumerable]]: true, [[Configurable]]: D}. 23 6. Else, 24 [...] 25 7. Perform ? DefinePropertyOrThrow(globalObject, N, desc). 26 [...] 27 includes: [propertyHelper.js] 28 ---*/ 29 30 var initial = null; 31 32 Object.defineProperty(this, 'f', { 33 enumerable: false, 34 writable: false, 35 configurable: true 36 }); 37 38 (0, eval)('initial = f; function f() { return 345; }'); 39 40 verifyProperty(this, 'f', { 41 writable: true, 42 enumerable: true, 43 configurable: true, 44 }); 45 46 assert.sameValue(typeof initial, 'function'); 47 assert.sameValue(initial(), 345); 48 49 reportCompare(0, 0);