* Use type_layout to declaratively express heap object headers in both
custom allocator and ObjectFactory.
* Invoke constructor (w/o invoking Kotin constructors) for created
objects and arrays from both custom allocator and ObjectFactory.
Previously:
- custom allocator only checked body for nullability (now this is
performed in body constructor)
- ObjectFactory only constructed ObjectData
* In each GC have a AllocatorImpl.hpp and ObjectData.hpp headers
the first encapsulating allocator-specific types, the second
containing specific ObjectData implementation.
* In each GC have a separate ObjectFactoryTraits that does not
actually depend on the specific GC anymore.
* Each GC now expose ObjectData (as undefined type) and its descriptor,
the latter being used by the custom allocator and ObjectFactory.
* Descriptors for ObjectBody and ArrayBody now live in Memory.h and the
code calculating size is now shared. Their constructors check that the
memory is zeroed (Kotlin constructors will expect this).
* A separate RegularWeakReferenceImpl for the new mm. Name is chosen for
better consistency with other WeakReferenceImpl implementations.
* KRefSharedHolder and BackRefFromAssociatedObject implementations are
independent between the legacy and the new mm.
* Better support for WeakReference in runtime unit tests.
The new GC will require threads to suspend right after registering
if Stop-The-World is requested. This patch changes the initial
thread state to kNative and adds a separate state switch right
after thread registering. This switch suspends if it is necessary.
Including
* Support thread state switching in codegen
* Introduce and use GCUnsafeCall annotation
* Switch thread state in C++ runtime code
Also
* Register current thread in Mark&Sweep tests
* Store MemoryState in Worker instance
* Set worker tid in WorkerInit
Integrating the stdlib with the thread states machinery requires
accessing to some parts of the new MM. This patch provides this
access by moving these parts to the main Memory.h header.
* test_support::TypeInfoHolder to create TypeInfo given payload description
* test_support::Object<Payload> to create objects with Payload and to get them from ObjHeader* after checking that their type_info are layout compatible.
* test_support::*Array<Count> to create various arrays with given length and similarly get them from ArrayHeader*.
Alexander Shabalin