Add support for interface dispatch to have a codepath that supports resolution from a metadata token

- Instead of an interface/slot pair
- Cell information is now consolidated into a structure instead of being passed around as a tuple of interface/slot
- Encoding is more complex to avoid bloating the data format
- In addition to interface dispatch, the logic is also able to perform vtable dispatch
- Add support for the concept of dynamic modules
- A dynamic module provides a set of callbacks that are special around the behavior of interface dispatch
- ModuleList associates a DynamicModule with normal module. At some point we will consolidate the DynamicModule with the ModuleManager

Miscellaneous changes
- New variant of LockFreeReaderHashtable to be used with native pointers.
- Support for a cloned type to be cloned based on a direct pointer instead of an indirection

[tfs-changeset: 1630711]

1 files changed, 15 insertions, 0 deletions

diff --git a/src/Native/Runtime/i386/StubDispatch.asm b/src/Native/Runtime/i386/StubDispatch.asm
index 3a0873609..037505edc 100644
--- a/src/Native/Runtime/i386/StubDispatch.asm
+++ b/src/Native/Runtime/i386/StubDispatch.asm
@@ -149,6 +149,21 @@ RhpInterfaceDispatchNullReference proc public
         int     3
 RhpInterfaceDispatchNullReference endp
 
+;; Stub dispatch routine for dispatch to a vtable slot
+_RhpVTableOffsetDispatch proc public
+        ;; eax currently contains the indirection cell address. We need to update it to point to the vtable offset (which is in the m_pCache field)
+        mov     eax, [eax + OFFSETOF__InterfaceDispatchCell__m_pCache]
+
+        ;; add the vtable offset to the EEType pointer 
+        add     eax, [ecx]
+
+        ;; Load the target address of the vtable into eax
+        mov     eax, [eax]
+
+        ;; tail-jump to the target
+        jmp     eax
+_RhpVTableOffsetDispatch endp
+
 
 ;; Initial dispatch on an interface when we don't have a cache yet.
 _RhpInitialInterfaceDispatch proc public