tor-browser

The Tor Browser
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dflt-params-arg-val-not-undefined.js (3283B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/function-forms/dflt-params-arg-val-not-undefined.case
      4 // - src/function-forms/default/cls-decl-async-gen-meth.template
      5 /*---
      6 description: Use of initializer when argument value is not `undefined` (class declaration async generator method)
      7 esid: sec-class-definitions-runtime-semantics-evaluation
      8 features: [default-parameters, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    ClassDeclaration : class BindingIdentifier ClassTail
     12 
     13    1. Let className be StringValue of BindingIdentifier.
     14    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
     15       argument className.
     16    [...]
     17 
     18    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
     19 
     20    21. For each ClassElement m in order from methods
     21        a. If IsStatic of m is false, then
     22           i. Let status be the result of performing
     23              PropertyDefinitionEvaluation for m with arguments proto and
     24              false.
     25        [...]
     26 
     27    Runtime Semantics: PropertyDefinitionEvaluation
     28 
     29    AsyncGeneratorMethod :
     30        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
     31            { AsyncGeneratorBody }
     32 
     33    1. Let propKey be the result of evaluating PropertyName.
     34    2. ReturnIfAbrupt(propKey).
     35    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
     36       Otherwise let strict be false.
     37    4. Let scope be the running execution context's LexicalEnvironment.
     38    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
     39       AsyncGeneratorBody, scope, strict).
     40    [...]
     41 
     42 
     43    14.1.19 Runtime Semantics: IteratorBindingInitialization
     44 
     45    FormalsList : FormalsList , FormalParameter
     46 
     47    [...]
     48    23. Let iteratorRecord be Record {[[Iterator]]:
     49        CreateListIterator(argumentsList), [[Done]]: false}.
     50    24. If hasDuplicates is true, then
     51        [...]
     52    25. Else,
     53        a. Perform ? IteratorBindingInitialization for formals with
     54           iteratorRecord and env as arguments.
     55    [...]
     56 
     57 ---*/
     58 var obj = {};
     59 var falseCount = 0;
     60 var stringCount = 0;
     61 var nanCount = 0;
     62 var zeroCount = 0;
     63 var nullCount = 0;
     64 var objCount = 0;
     65 
     66 var callCount = 0;
     67 class C {
     68  async *method(aFalse = falseCount +=1, aString = stringCount += 1, aNaN = nanCount += 1, a0 = zeroCount += 1, aNull = nullCount += 1, aObj = objCount +=1) {
     69    assert.sameValue(aFalse, false);
     70    assert.sameValue(aString, '');
     71    assert.sameValue(aNaN, NaN);
     72    assert.sameValue(a0, 0);
     73    assert.sameValue(aNull, null);
     74    assert.sameValue(aObj, obj);
     75    callCount = callCount + 1;
     76  }
     77 }
     78 
     79 // Stores a reference `ref` for case evaluation
     80 var ref = C.prototype.method;
     81 
     82 ref(false, '', NaN, 0, null, obj).next().then(() => {
     83    assert.sameValue(callCount, 1, 'method invoked exactly once');
     84 }).then($DONE, $DONE);
     85 
     86 assert.sameValue(falseCount, 0, 'initializer not evaluated: false');
     87 assert.sameValue(stringCount, 0, 'initializer not evaluated: string');
     88 assert.sameValue(nanCount, 0, 'initializer not evaluated: NaN');
     89 assert.sameValue(zeroCount, 0, 'initializer not evaluated: 0');
     90 assert.sameValue(nullCount, 0, 'initializer not evaluated: null');
     91 assert.sameValue(objCount, 0, 'initializer not evaluated: object');