Sent from my iPhone
> On Oct 30, 2016, at 6:18 PM, Zac Hansen <[email protected]> wrote:
>
> I've boiled it down to the
>
> LookupIterator::configuration & kPrototypeChain == true
>
>
>
> being the problem. So, what can cause that to be true? It seems to be the
> default unless name->IsPrivate() is true here:
>
>
>
> https://github.com/v8/v8/blob/c2a5dc81c7a26579a599ddaf31a7cf84706135b9/src/lookup.h#L329
>
>
>
> but I don't know what that means.
>
IsPrivate() is true if the name is a Symbol with its private field set,
equivalent to ECMA262 "internal fields" (like, [[ViewedArrayBuffer]], for
example). It looks like it's possible to create such a symbol via the API using
v8::Private::New, or the SymbolFor api. These are never looked up in the
prototype chain, AFAIK are never exposed to interceptors, and are never exposed
to JSProxy hooks.
Hope that helps in some way.
>
>> On Saturday, October 29, 2016 at 3:33:14 AM UTC-7, Zac Hansen wrote:
>> I run the following javascript:
>>
>> var p = new Point(); p.foo = 5;
>>
>> where Point creates an object from an ObjectTemplate that has had SetHandler
>> called on it. However, this calls my getter callback. Everything I've
>> tried from javascript calls my getter callback.
>>
>> object_template->SetHandler(v8::NamedPropertyHandlerConfiguration(
>> // Getter
>> [](v8::Local<v8::Name> property_name,
>> v8::PropertyCallbackInfo<v8::Value>
>> const & info){
>> printf("IN GETTER CALLBACK111
>> %s\n", *v8::String::Utf8Value(property_name));
>> },
>> // setter
>> [](v8::Local<v8::Name> property_name,
>> v8::Local<v8::Value> new_property_value,
>> v8::PropertyCallbackInfo<v8::Value> const & info){
>> printf("IN SETTER CALLBACK222
>> %s\n", *v8::String::Utf8Value(property_name));
>> },
>> nullptr, // query
>> nullptr, // deleter
>> nullptr, // enumerator
>> v8::External::New(this->isolate, (void *)data),
>> v8::PropertyHandlerFlags::kNonMasking)); // <== Tried
>> with and without this
>> };
>>
>>
>> and prints out: IN GETTER CALLBACK111 foo
>>
>> I originally tried with the older API for string-only property names and had
>> the same results.
>>
>> #define V8_MAJOR_VERSION 5
>> #define V8_MINOR_VERSION 6
>> #define V8_BUILD_NUMBER 0
>> #define V8_PATCH_LEVEL 0
>>
>> on os x 10.11 clang 3.9
>
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