tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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scope-body-var-none.js (2853B)

      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-for-statement-runtime-semantics-labelledevaluation
      5 description: >
      6    No variable environment is created for each evaluation of the statement
      7    body
      8 info: |
      9    [...]
     10    11. Let bodyResult be ForBodyEvaluation(the first Expression, the second
     11        Expression, Statement, perIterationLets, labelSet).
     12    [...]
     13 
     14    13.7.4.8 Runtime Semantics: ForBodyEvaluation
     15 
     16    [...]
     17    2. Perform ? CreatePerIterationEnvironment(perIterationBindings).
     18    3. Repeat
     19       [...]
     20       b. Let result be the result of evaluating stmt.
     21       [...]
     22       e. Perform ? CreatePerIterationEnvironment(perIterationBindings).
     23       [...]
     24 
     25    13.7.4.9 Runtime Semantics: CreatePerIterationEnvironment
     26 
     27    1. If perIterationBindings has any elements, then
     28       [...]
     29       e. Let thisIterationEnv be NewDeclarativeEnvironment(outer).
     30       f. Let thisIterationEnvRec be thisIterationEnv's EnvironmentRecord.
     31 flags: [noStrict]
     32 ---*/
     33 
     34 var probeBefore = function() { return [x, y, z]; };
     35 var probeTest, probeIncr, probeBody;
     36 var run = true;
     37 
     38 for (
     39    ;
     40    run && (eval('var x = 1;'), probeTest = function() { return [x, y, z]; });
     41    eval('var y = 1;'), probeIncr = function() { return [x, y, z]; }
     42  )
     43  var z = 1, _ = (probeBody = function() { return [x, y, z]; }), run = false;
     44 
     45 var x = 2;
     46 var y = 2;
     47 var z = 2;
     48 
     49 assert.sameValue(
     50  probeBefore()[0],
     51  2,
     52  'reference preceding statement (redeclared in "test" position)'
     53 );
     54 assert.sameValue(
     55  probeBefore()[1],
     56  2,
     57  'reference preceding statement (redeclared in statement body)'
     58 );
     59 assert.sameValue(
     60  probeBefore()[2],
     61  2,
     62  'reference preceding statement (redeclared in "increment" position)'
     63 );
     64 
     65 assert.sameValue(
     66  probeTest()[0],
     67  2,
     68  'reference from "test" position (redeclared in "test" position)'
     69 );
     70 assert.sameValue(
     71  probeTest()[1],
     72  2,
     73  'reference from "test" position (redeclared in statement body)'
     74 );
     75 assert.sameValue(
     76  probeTest()[2],
     77  2,
     78  'reference from "test" position (redeclared in "increment" position)'
     79 );
     80 
     81 assert.sameValue(
     82  probeBody()[0],
     83  2,
     84  'reference from statement body (redeclared in "test" position)'
     85 );
     86 assert.sameValue(
     87  probeBody()[1],
     88  2,
     89  'reference from statement body (redeclared in statement body)'
     90 );
     91 assert.sameValue(
     92  probeBody()[2],
     93  2,
     94  'reference from statement body (redeclared in "increment" position)'
     95 );
     96 
     97 assert.sameValue(
     98  probeIncr()[0],
     99  2,
    100  'reference from "increment" position (redeclared in "test" position)'
    101 );
    102 assert.sameValue(
    103  probeIncr()[1],
    104  2,
    105  'reference from "increment" position (redeclared in statement body)'
    106 );
    107 assert.sameValue(
    108  probeIncr()[2],
    109  2,
    110  'reference from "increment" position (redeclared in "increment" position)'
    111 );
    112 
    113 reportCompare(0, 0);