Enable mixed mode assembly loading (#19542)

Bring back functionality for loading IJW assemblies and calling managed->native. Also add workaround to test case for the C++ compiler inserting calls to mscoree.

1 files changed, 31 insertions, 0 deletions

diff --git a/src/vm/method.cpp b/src/vm/method.cpp
index bcc11e85ff..2890c34fb7 100644
--- a/src/vm/method.cpp
+++ b/src/vm/method.cpp
@@ -5048,6 +5048,37 @@ LPVOID NDirectMethodDesc::FindEntryPoint(HINSTANCE hMod) const
 }
 #endif // CROSSGEN_COMPILE
 
+#if !defined(CROSSGEN_COMPILE)
+//*******************************************************************************
+void NDirectMethodDesc::InitEarlyBoundNDirectTarget()
+{
+    CONTRACTL
+    {
+        THROWS;
+        GC_TRIGGERS;
+        INJECT_FAULT(COMPlusThrowOM(););
+    }
+    CONTRACTL_END
+
+    _ASSERTE(IsEarlyBound());
+
+    if (IsClassConstructorTriggeredAtLinkTime())
+    {
+        GetMethodTable()->CheckRunClassInitThrowing();
+    }
+
+    const void *target = GetModule()->GetInternalPInvokeTarget(GetRVA());
+    _ASSERTE(target != 0);
+
+    if (HeuristicDoesThisLookLikeAGetLastErrorCall((LPBYTE)target))
+        target = (BYTE*)FalseGetLastError;
+
+    // As long as we've set the NDirect target field we don't need to backpatch the import thunk glue.
+    // All NDirect calls all through the NDirect target, so if it's updated, then we won't go into
+    // NDirectImportThunk().  In fact, backpatching the import thunk glue leads to race conditions.
+    SetNDirectTarget((LPVOID)target);
+}
+#endif // !CROSSGEN_COMPILE
 
 //*******************************************************************************
 void MethodDesc::ComputeSuppressUnmanagedCodeAccessAttr(IMDInternalImport *pImport)