Use `std` functionality where possible. Only size_t needs
to be defined like was done with the `intptr_t` type before.
Also unifies the usage of `std::os::raw` types that where
already defined in the support module.
This commit adds "v8::Isolate::snapshot_creator_from_existing_snapshot" API,
that allows to create a new snapshot from already existing snapshot.
Following APIs were added as well:
"v8::Context::from_snapshot"
"v8::Isolate::add_context"
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: Bert Belder <bertbelder@gmail.com>
Currently, when a finalizer callback is registered, it is not
guaranteed to be called if there is a global reference to the
corresponding object that survives the isolate. This is because the
finalizer callback takes a `&mut Isolate`, and so it must be called
before the isolate is fully destroyed, but all existing globals
(including possibly the one being currently finalized) are still
usable while there still exists a mutable reference to the isolate.
However, there are still use cases for having finalizers that are
guaranteed to run regardless of any remaining globals, but that don't
require any interaction with the isolate. This change adds them.
This change also changes the context annex to use a guaranteed
finalizer, fixing a bug with context slots not being freed if there
were any globals to the context at the time the isolate is dropped.
