tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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script-decl-var.js (2263B)

      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-globaldeclarationinstantiation
      5 es6id: 15.1.8
      6 description: Declaration of variable where permissible
      7 info: |
      8  [...]
      9  11. Let declaredVarNames be a new empty List.
     10  12. For each d in varDeclarations, do
     11      a. If d is a VariableDeclaration or a ForBinding, then
     12         i. For each String vn in the BoundNames of d, do
     13            1. If vn is not an element of declaredFunctionNames, then
     14               a. Let vnDefinable be ? envRec.CanDeclareGlobalVar(vn).
     15               b. If vnDefinable is false, throw a TypeError exception.
     16               c. If vn is not an element of declaredVarNames, then
     17                  i. Append vn to declaredVarNames.
     18  [...]
     19  18. For each String vn in declaredVarNames, in list order do
     20      a. Perform ? envRec.CreateGlobalVarBinding(vn, false).
     21  [...]
     22 
     23  8.1.1.4.15 CanDeclareGlobalVar
     24 
     25  1. Let envRec be the global Environment Record for which the method was
     26     invoked.
     27  2. Let ObjRec be envRec.[[ObjectRecord]].
     28  3. Let globalObject be the binding object for ObjRec.
     29  4. Let hasProperty be ? HasOwnProperty(globalObject, N).
     30  5. If hasProperty is true, return true.
     31  6. Return ? IsExtensible(globalObject). 
     32 includes: [propertyHelper.js]
     33 ---*/
     34 
     35 $262.evalScript('var brandNew;');
     36 
     37 verifyProperty(this, 'brandNew', {
     38  value: undefined,
     39  writable: true,
     40  enumerable: true,
     41  configurable: false,
     42 });
     43 
     44 Object.defineProperty(
     45  this,
     46  'configurable',
     47  { configurable: true, writable: false, enumerable: false, value: 0 }
     48 );
     49 Object.defineProperty(
     50  this,
     51  'nonConfigurable',
     52  { configurable: false, writable: false, enumerable: false, value: 0 }
     53 );
     54 
     55 // Prevent extensions on the global object to ensure that detail is not
     56 // considered by any of the declarations which follow.
     57 Object.preventExtensions(this);
     58 
     59 $262.evalScript('var configurable;');
     60 
     61 verifyProperty(this, 'configurable', {
     62  value: 0,
     63  writable: false,
     64  enumerable: false,
     65  configurable: true,
     66 });
     67 
     68 $262.evalScript('var nonConfigurable;');
     69 
     70 verifyProperty(this, 'nonConfigurable', {
     71  value: 0,
     72  writable: false,
     73  enumerable: false,
     74  configurable: false,
     75 });
     76 
     77 reportCompare(0, 0);