In V8 if I have a closure such as in this example where I have a
function f that returns an anonymous closure:
function f() {
var x = 0;
var y = 1;
return function() {
return x + y;
};
}
In V8 does the returned closure keep two pointers (one to x, and one
to y), or does it keep a single pointer back to the execution context
of f? Or does it do something else altogether?
Also, can anyone give me pointers to what files in the V8 source code
I should take a look at to get an understanding of how this works?
Partially, I'm just curious, and partially I'm wondering about
performance implications. If f defined way more variables, is each
closure going to chew up more memory to keep track of all of those
pointers?
Also, from a GC perspective, I'm wondering in the case that something
like this happens:
function g() {
var x = 0
var y = 1;
return function() {
return x;
};
}
// lets day h is a global that sticks arround forever.
var h = g();
Will y never be garbage collected since its part of an execution
context pointed to by the closure held in h?
Thanks, and again, pointers back to the source code are appreciated.
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