Thunk pool implementation for CoreRT. In CoreRT, the thunk mappings are allocated dynamically in memory using VirtualAlloc. The thunk stubs pages are marked with RX permissions and the thunks data pages are marked with RW permissions.

Refactored some code in ThunkPool.cs to remove from it any knowledge about the thunk sections layout. Thunks layout and allocation become a black box to ThunkPool.cs. All the section layout information is moved to the native component, and section navigation is done by calls to some APIs.

The dynamically allocated thunks pages are enabled by a FEATURE_RX_THUNKS, and only in CoreRT's Full build for now. The portable build doesn't yet support thunks.

[tfs-changeset: 1638131]

1 files changed, 20 insertions, 1 deletions

diff --git a/src/Native/Runtime/portable.cpp b/src/Native/Runtime/portable.cpp
index 9f949ec6c..e8a25b119 100644
--- a/src/Native/Runtime/portable.cpp
+++ b/src/Native/Runtime/portable.cpp
@@ -342,9 +342,9 @@ COOP_PINVOKE_HELPER(void, RhpMemoryBarrier, ())
     PalMemoryBarrier();
 }
 
+#ifdef USE_PORTABLE_HELPERS
 COOP_PINVOKE_HELPER(void *, RhpGetThunksBase, ())
 {
-    ASSERT_UNCONDITIONALLY("NYI");
     return NULL;
 }
 
@@ -366,6 +366,25 @@ COOP_PINVOKE_HELPER(int, RhpGetThunkSize, ())
     return 0;
 }
 
+COOP_PINVOKE_HELPER(void*, RhpGetThunkDataBlockAddress, (void* pThunkStubAddress))
+{
+    ASSERT_UNCONDITIONALLY("NYI");
+    return NULL;
+}
+
+COOP_PINVOKE_HELPER(void*, RhpGetThunkStubsBlockAddress, (void* pThunkDataAddress))
+{
+    ASSERT_UNCONDITIONALLY("NYI");
+    return NULL;
+}
+
+COOP_PINVOKE_HELPER(void*, RhpGetNextThunkStubsBlockAddress, (void* pCurrentThunkStubsBlockAddress))
+{
+    ASSERT_UNCONDITIONALLY("NYI");
+    return NULL;
+}
+#endif
+
 COOP_PINVOKE_HELPER(void, RhCallDescrWorker, (void * callDescr))
 {
     ASSERT_UNCONDITIONALLY("NYI");