tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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length.js (2904B)

      1 // |reftest| shell-option(--enable-shadow-realms) skip-if(!xulRuntime.shell) -- requires shell-options
      2 // Copyright (C) 2022 Chengzhong Wu. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 /*---
      5 esid: sec-wrappedfunctioncreate
      6 description: >
      7  The value of WrappedFunction.name is copied from the target function
      8 info: |
      9  WrappedFunctionCreate ( callerRealm: a Realm Record, Target: a function object, )
     10 
     11  ...
     12  7. Let result be CopyNameAndLength(wrapped, Target).
     13  ...
     14 
     15  CopyNameAndLength ( F: a function object, Target: a function object, prefix: a String, optional argCount: a Number, )
     16 
     17  1. If argCount is undefined, then set argCount to 0.
     18  2. Let L be 0.
     19  3. Let targetHasLength be ? HasOwnProperty(Target, "length").
     20  4. If targetHasLength is true, then
     21    a. Let targetLen be ? Get(Target, "length").
     22    b. If Type(targetLen) is Number, then
     23        i. If targetLen is +∞𝔽, set L to +∞.
     24        ii. Else if targetLen is -∞𝔽, set L to 0.
     25        iii. Else,
     26            1. Let targetLenAsInt be ! ToIntegerOrInfinity(targetLen).
     27            2. Assert: targetLenAsInt is finite.
     28            3. Set L to max(targetLenAsInt - argCount, 0).
     29  5. Perform ! SetFunctionLength(F, L).
     30  ...
     31 
     32  SetFunctionLength ( F, length )
     33 
     34  ...
     35  2. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
     36 
     37 includes: [propertyHelper.js]
     38 features: [ShadowRealm]
     39 ---*/
     40 
     41 assert.sameValue(
     42  typeof ShadowRealm.prototype.evaluate,
     43  'function',
     44  'This test must fail if ShadowRealm.prototype.evaluate is not a function'
     45 );
     46 
     47 const r = new ShadowRealm();
     48 
     49 
     50 let wrapped = r.evaluate(`
     51 function fn(foo, bar) {}
     52 fn;
     53 `);
     54 verifyProperty(wrapped, "length", {
     55  value: 2,
     56  enumerable: false,
     57  writable: false,
     58  configurable: true,
     59 });
     60 
     61 
     62 wrapped = r.evaluate(`
     63 function fn() {}
     64 delete fn.length;
     65 fn;
     66 `);
     67 verifyProperty(wrapped, "length", {
     68  value: 0,
     69  enumerable: false,
     70  writable: false,
     71  configurable: true,
     72 });
     73 
     74 
     75 wrapped = r.evaluate(`
     76 function fn() {}
     77 Object.defineProperty(fn, 'length', {
     78  get: () => Infinity,
     79  enumerable: false,
     80  configurable: true,
     81 });
     82 fn;
     83 `);
     84 verifyProperty(wrapped, "length", {
     85  value: Infinity,
     86  enumerable: false,
     87  writable: false,
     88  configurable: true,
     89 });
     90 
     91 
     92 wrapped = r.evaluate(`
     93 function fn() {}
     94 Object.defineProperty(fn, 'length', {
     95  get: () => -Infinity,
     96  enumerable: false,
     97  configurable: true,
     98 });
     99 fn;
    100 `);
    101 verifyProperty(wrapped, "length", {
    102  value: 0,
    103  enumerable: false,
    104  writable: false,
    105  configurable: true,
    106 });
    107 
    108 
    109 wrapped = r.evaluate(`
    110 function fn() {}
    111 Object.defineProperty(fn, 'length', {
    112  get: () => -1,
    113  enumerable: false,
    114  configurable: true,
    115 });
    116 fn;
    117 `);
    118 verifyProperty(wrapped, "length", {
    119  value: 0,
    120  enumerable: false,
    121  writable: false,
    122  configurable: true,
    123 });
    124 
    125 reportCompare(0, 0);