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Bug 1148652, part 3 - Mark arguments.length as overridden when it is redefined via the C API. r=efaust.

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This commit is contained in:
Jason Orendorff 2015-03-23 14:32:33 -05:00
parent 04f1f59ecb
commit 1c594e8314
1 changed files with 10 additions and 0 deletions
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10
js/src/vm/NativeObject.cpp
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@ -1309,6 +1309,16 @@ js::NativeDefineProperty(ExclusiveContext* cx, HandleNativeObject obj, HandleId
return false;
return DefineTypedArrayElement(cx->asJSContext(), obj, index, desc_, result);
}
} else if (obj->is<ArgumentsObject>()) {
if (id == NameToId(cx->names().length)) {
// Either we are resolving the .length property on this object, or
// redefining it. In the latter case only, we must set a bit. To
// distinguish the two cases, we note that when resolving, the
// property won't already exist; whereas the first time it is
// redefined, it will.
if (obj->containsPure(id))
obj->as<ArgumentsObject>().markLengthOverridden();
}
}
Rooted<PropertyDescriptor> desc(cx, desc_);