var-env-func-init-global-update-non-configurable.js (1379B)
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: > 6 Modification of previously-existing non-configurable global property 7 info: | 8 [...] 9 15. For each production f in functionsToInitialize, do 10 a. Let fn be the sole element of the BoundNames of f. 11 b. Let fo be the result of performing InstantiateFunctionObject for f 12 with argument lexEnv. 13 c. If varEnvRec is a global Environment Record, then 14 i. Perform ? varEnvRec.CreateGlobalFunctionBinding(fn, fo, true). 15 [...] 16 17 8.1.1.4.18 CreateGlobalFunctionBinding 18 19 [...] 20 5. If existingProp is undefined or existingProp.[[Configurable]] is true, 21 then 22 [...] 23 6. Else, 24 b. Let desc be the PropertyDescriptor{[[Value]]: V }. 25 7. Perform ? DefinePropertyOrThrow(globalObject, N, desc). 26 [...] 27 includes: [propertyHelper.js] 28 ---*/ 29 30 var initial; 31 32 Object.defineProperty(this, 'f', { 33 enumerable: true, 34 writable: true, 35 configurable: false 36 }); 37 38 (0,eval)('initial = f; function f() { return 2222; }'); 39 40 verifyProperty(this, 'f', { 41 writable: true, 42 enumerable: true, 43 configurable: false, 44 }); 45 46 assert.sameValue(typeof initial, 'function'); 47 assert.sameValue(initial(), 2222); 48 49 reportCompare(0, 0);