mirror of
https://github.com/tc39/test262.git
synced 2025-10-30 11:13:51 +01:00
103 lines
3.2 KiB
JavaScript
103 lines
3.2 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
/*---
|
|
description: Referencing the arguments object from a default parameter (class expression method)
|
|
esid: sec-runtime-semantics-bindingclassdeclarationevaluation
|
|
es6id: 14.5.15
|
|
features: [default-parameters]
|
|
info: |
|
|
ClassDeclaration : class BindingIdentifier ClassTail
|
|
|
|
1. Let className be StringValue of BindingIdentifier.
|
|
2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
|
|
argument className.
|
|
[...]
|
|
|
|
14.5.14 Runtime Semantics: ClassDefinitionEvaluation
|
|
|
|
21. For each ClassElement m in order from methods
|
|
a. If IsStatic of m is false, then
|
|
i. Let status be the result of performing
|
|
PropertyDefinitionEvaluation for m with arguments proto and
|
|
false.
|
|
[...]
|
|
|
|
14.3.8 Runtime Semantics: DefineMethod
|
|
|
|
MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
|
|
|
|
[...]
|
|
6. Let closure be FunctionCreate(kind, StrictFormalParameters, FunctionBody,
|
|
scope, strict). If functionPrototype was passed as a parameter then pass its
|
|
value as the functionPrototype optional argument of FunctionCreate.
|
|
[...]
|
|
|
|
9.2.1 [[Call]] ( thisArgument, argumentsList)
|
|
|
|
[...]
|
|
7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
|
|
[...]
|
|
|
|
9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
|
|
|
|
1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
|
|
[...]
|
|
|
|
9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
|
|
|
|
[...]
|
|
23. Let iteratorRecord be Record {[[iterator]]:
|
|
CreateListIterator(argumentsList), [[done]]: false}.
|
|
24. If hasDuplicates is true, then
|
|
[...]
|
|
25. Else,
|
|
b. Let formalStatus be IteratorBindingInitialization for formals with
|
|
iteratorRecord and env as arguments.
|
|
[...]
|
|
|
|
14.1.19 Runtime Semantics: IteratorBindingInitialization
|
|
|
|
FormalsList : FormalsList , FormalParameter
|
|
|
|
1. Let status be the result of performing IteratorBindingInitialization for
|
|
FormalsList using iteratorRecord and environment as the arguments.
|
|
2. ReturnIfAbrupt(status).
|
|
3. Return the result of performing IteratorBindingInitialization for
|
|
FormalParameter using iteratorRecord and environment as the arguments.
|
|
---*/
|
|
|
|
var callCount = 0;
|
|
class C {
|
|
method(x, _ = 0) {
|
|
assert.sameValue(x, undefined, 'parameter binding value (initial)');
|
|
assert.sameValue(
|
|
arguments[0], undefined, 'arguments property value (initial)'
|
|
);
|
|
|
|
arguments[0] = 1;
|
|
|
|
assert.sameValue(
|
|
x, undefined, 'parameter binding value (after arguments modification)'
|
|
);
|
|
assert.sameValue(
|
|
arguments[0], 1, 'arguments property value (after arguments modification)'
|
|
);
|
|
|
|
x = 2;
|
|
|
|
assert.sameValue(
|
|
x, 2, 'parameter binding value (after parameter binding modification)'
|
|
);
|
|
assert.sameValue(
|
|
arguments[0],
|
|
1,
|
|
'arguments property value (after parameter binding modification)'
|
|
);
|
|
callCount = callCount + 1;
|
|
}
|
|
}
|
|
|
|
C.prototype.method();
|
|
|
|
assert.sameValue(callCount, 1, 'method invoked exactly once');
|