The various places that were using the CodeBuffer object were using
internal implementation details that are changing as we move over to a
bitmap allocator.
Preempt this by hiding some of the implementation details early without
changing behaviour. `GetBufferBase` is still technically leaking some of
the internal details, but it needs changes around how relocations are
being handled and how the disk cache validation works in order to handle
that right now.
Should be no functional change.
It's soon going to change how these buffers are managed, where the
CodeBuffer is going to manage its own allocations soon once it changes
over to the bitmap allocator. Additionally the Manager class is actually
going to do proper management, pooling, and invalidation handling.
Split the task preemptively before we switch to the bitmap allocator to
reduce churn. A little change in the CodeCache where it needs to query
the codebuffer directly rather than the context, but fairly safe.
Shouldn't be any real behaviour change.
This removes the fairly long lived lock that the buffer allocator held
while doing significantly more work than intended while holding that
lock.
As the first step towards moving over to the atomic bitmap allocator,
change this to be atomic to closer match what the new allocator is
doing. Since we are just doing linear allocations, this is an easy
convert and should give a good stutter improvement.
NFC
- Renames CodeBufferManager to SharedCodeBufferManager to be more
explicit about it being shared between threads
- Renames `CodeBuffers` to `SharedCodeBuffers` to make it more explicit
about sharing these buffers between threads.
- Separates the Manager to its own file so it is distinct from the rest
of the CPUBackend code
Makes it easier to parse ownership and lifetime semantics of these
buffers.
Ryan Houdek