Boa: Cache standard objects (`Array`, `Object`, etc) and there prototypes

[HalidOdat]

What is the problem with the current implementation?
The problem is that when we access a standard object we use .get_field() to get it from the global object, the problem is that we have to do a hashmap lookup and .get_field() does other checks that are not necessary.

we have to do:

interpreter.global().get_field("Object")

or to get the prototype we have to do two HashMap lookups

interpreter.global().get_field("Object").get_field("prototype")

Proposed changes
Store the common standard objects in the realm/interpreter as struct fields maybe:

struct StandardObject {
    object: GcObject,
    prototype: GcObject,
}
struct StandardObjects {
    object_object: StandardObject,
    array_object: StandardObject,
    function_object: StandardObject,
    error_object: StandardObject,
    // ... other standard objects ...
}

This way if we need to access the prototype of for example Function object we do something like:

interpreter.standard_objects.function_object.prototype

This way we avoid all the unnecessary HashMap lookups and the checks from .get_field()

[54k1]

@HalidOdat, I have made some preliminary changes here based on what you have suggested.

Could you have a look? We can extend this so that the entire codebase uses standard_objects wherever possible.

[HalidOdat]

@HalidOdat, I have made some preliminary changes here based on what you have suggested.

Could you have a look? We can extend this so that the entire codebase uses standard_objects wherever possible.

This looks good! There are still something that we can improve in this initial implementation, we should create a draft PR so we can better comment on it and see what the benchmark speed gains there are.