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68 lines
2.4 KiB
JavaScript
68 lines
2.4 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: Referencing the arguments object from a default parameter (generator method)
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esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation
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es6id: 14.4.13
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features: [generators, default-parameters]
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info: |
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GeneratorMethod :
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* PropertyName ( StrictFormalParameters ) { GeneratorBody }
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1. Let propKey be the result of evaluating PropertyName.
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2. ReturnIfAbrupt(propKey).
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3. If the function code for this GeneratorMethod is strict mode code,
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let strict be true. Otherwise let strict be false.
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4. Let scope be the running execution context's LexicalEnvironment.
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5. Let closure be GeneratorFunctionCreate(Method,
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StrictFormalParameters, GeneratorBody, scope, strict).
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[...]
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9.2.1 [[Call]] ( thisArgument, argumentsList)
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[...]
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7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
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[...]
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9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
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1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
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[...]
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9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
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[...]
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23. Let iteratorRecord be Record {[[iterator]]:
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CreateListIterator(argumentsList), [[done]]: false}.
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24. If hasDuplicates is true, then
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[...]
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25. Else,
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b. Let formalStatus be IteratorBindingInitialization for formals with
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iteratorRecord and env as arguments.
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[...]
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14.1.19 Runtime Semantics: IteratorBindingInitialization
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FormalsList : FormalsList , FormalParameter
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1. Let status be the result of performing IteratorBindingInitialization for
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FormalsList using iteratorRecord and environment as the arguments.
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2. ReturnIfAbrupt(status).
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3. Return the result of performing IteratorBindingInitialization for
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FormalParameter using iteratorRecord and environment as the arguments.
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---*/
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var callCount = 0;
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var obj = {
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*method(x = arguments[2], y = arguments[3], z) {
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assert.sameValue(x, 'third', 'first parameter');
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assert.sameValue(y, 'fourth', 'second parameter');
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assert.sameValue(z, 'third', 'third parameter');
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callCount = callCount + 1;
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}
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};
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obj.method(undefined, undefined, 'third', 'fourth').next();
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assert.sameValue(callCount, 1, 'generator method invoked exactly once');
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