Status: Untriaged
Owner: ----
New issue 4264 by [email protected]: Function.arguments object is
overwritten when it shouldn't.
https://code.google.com/p/v8/issues/detail?id=4264
Look at the following code.
function func( a, b, c, d) {
var arguments = "FAIL";
return a + b + c + d + " " + Array.prototype.slice.call(func.arguments,
0).join("");
}
print(func("P", "A", "S", "S"));
SpiderMonkey, JavaScriptCore and TurboFan agrees that it should
produce "PASS PASS". However the non-optimizing compiler and CrankShaft
both says "PASS FAIL".
I think the correct behavior is "PASS PASS", since reading the
specification http://www.ecma-international.org/ecma-262/5.1/#sec-10.6, it
states that the arguments object should not be created when there is a
VariableDeclaration with the identifier "arguments". Which i interpret to
mean that writing to the declared variable arguments, shouldn't change the
value of Function.arguments (Function.arguments is however not mentioned in
the specification, so I might have gotten it wrong).
It might relate to: https://code.google.com/p/v8/issues/detail?id=222
However, in that bug report the problem is that func.arguments is copied
for each access, here func.arguments is incorrectly overwritten.
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