As discussed in https://github.com/servo/servo/issues/26807#issuecomment-640151804, we'd like to
add a new flag, `in_memory_done`, to `TransmitBodyConnectHandler` so
that we can correctly finish and drop the sender correctly.
When we send the bytes, we will mark the body as done and we can
recognize it's already done in next tick so that we can send a Done
request to finish the sender.
Also, when there comes a redirect request, it will go to `re-extract`
route, we can set the `done` flag to `false` which means we won't
stop the IPC routers yet. Then, if the re-extract sent its bytes, we
will be marked as done again so that we can finish with stopping the IPC
routes when Chunk request comes.
Servo currently uses `heapsize`, but Stylo/Gecko use `malloc_size_of`.
`malloc_size_of` is better -- it handles various cases that `heapsize` does not
-- so this patch changes Servo to use `malloc_size_of`.
This patch makes the following changes to the `malloc_size_of` crate.
- Adds `MallocSizeOf` trait implementations for numerous types, some built-in
(e.g. `VecDeque`), some external and Servo-only (e.g. `string_cache`).
- Makes `enclosing_size_of_op` optional, because vanilla jemalloc doesn't
support that operation.
- For `HashSet`/`HashMap`, falls back to a computed estimate when
`enclosing_size_of_op` isn't available.
- Adds an extern "C" `malloc_size_of` function that does the actual heap
measurement; this is based on the same functions from the `heapsize` crate.
This patch makes the following changes elsewhere.
- Converts all the uses of `heapsize` to instead use `malloc_size_of`.
- Disables the "heapsize"/"heap_size" feature for the external crates that
provide it.
- Removes the `HeapSizeOf` implementation from `hashglobe`.
- Adds `ignore` annotations to a few `Rc`/`Arc`, because `malloc_size_of`
doesn't derive those types, unlike `heapsize`.
In a later PR, DomRoot<T> will become a type alias of Root<Dom<T>>,
where Root<T> will be able to handle all the things that need to be
rooted that have a stable traceable address that doesn't move for the
whole lifetime of the root. Stay tuned.
