I have a slightly better understanding of what's going on. I had forgotten
that function(){return b;} doesn't consult this.b, so setting the receiver
doesn't change anything.
What seems to be happening is that the function is taking the global object
from the original context with it when it runs later with a ->Call()
parameterized with a different context.
--Zac
On Tuesday, February 23, 2016 at 10:56:23 AM UTC-8, Zac Hansen wrote:
>
> This may be brain-dead obvious to those who understand what's going on
> underneath, but I was hoping to run javascript that assigns a function to a
> variable in one context and use that function in another context (in the
> same isolate). The goal behind this was to make sure to not allow the user
> to directly pollute the "real" global object while creating the function.
>
> When I try to do this, I get unexpected results, however, as the new
> context's global isn't picked up and the receiver information seems to be
> ignored.
>
> Full reproduction code here:
> https://gist.github.com/xaxxon/ad74e6a9c8ab76e3faf7
>
> Interesting bits:
>
> auto s = v8::Script::Compile(c,
> v8::String::NewFromUtf8(i,"a=function(){return b;}")).ToLocalChecked();
>
>
>
> (void)s->Run(c);
>
> }
>
>
> // THIS OF COURSE WORKS
>
> //(void)c->Global()->Set(c,String::NewFromUtf8(i,"b"),
> String::NewFromUtf8(i,"HELLO"));
>
> //auto a_val = c->Global()->Get(c,
> String::NewFromUtf8(i,"a")).ToLocalChecked();
>
> //auto a_func = Local<Function>::Cast(a_val);
>
> //auto result = a_func->Call(c, c->Global(), 0, nullptr);
>
> //printf("result: %s\n", *String::Utf8Value(result.ToLocalChecked()));
>
>
>
> auto c2 = v8::Context::New(i, nullptr, got);
>
> {
>
> Context::Scope cs2(c2);
>
> (void)c2->Global()->Set(c2,String::NewFromUtf8(i,"b"),
> String::NewFromUtf8(i,"HELLO"));
>
> auto a_val2 = c2->Global()->Get(c,
> String::NewFromUtf8(i,"a")).ToLocalChecked();
>
> auto a_func2 = Local<Function>::Cast(a_val2);
>
> auto result2 = a_func2->Call(c2, c2->Global(), 0, nullptr);
>
> printf("result: %s\n", *String::Utf8Value(result2.ToLocalChecked()));
>
> }
>
>
>
>
> Output: <unknown>:20: Uncaught ReferenceError: b is not defined
>
>
>
>
>
--
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