diff --git a/llvm/lib/Transforms/Coroutines/CoroSplit.cpp b/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
--- a/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
+++ b/llvm/lib/Transforms/Coroutines/CoroSplit.cpp
@@ -288,10 +288,24 @@
 
   switch (Shape.ABI) {
   // In switch-lowering, this does nothing in the main function.
-  case coro::ABI::Switch:
+  case coro::ABI::Switch: {
+    // In C++'s specificatin, the corotine should be marked as done
+    // if the coroutine leaves in unwinding path.
+    //
+    // FIXME: We should refactor this once there is other language
+    // which uses Switch-Resumed style other than C++.
+    //
+    // Done state is represented by storing zero in ResumeFnAddr.
+    auto *GepIndex = Builder.CreateStructGEP(
+        Shape.FrameTy, FramePtr, coro::Shape::SwitchFieldIndex::Resume,
+        "ResumeFn.addr");
+    auto *NullPtr = ConstantPointerNull::get(cast<PointerType>(
+        Shape.FrameTy->getTypeAtIndex(coro::Shape::SwitchFieldIndex::Resume)));
+    Builder.CreateStore(NullPtr, GepIndex);
     if (!InResume)
       return;
     break;
+  }
   // In async lowering this does nothing.
   case coro::ABI::Async:
     break;
diff --git a/llvm/test/Transforms/Coroutines/coro-split-eh-00.ll b/llvm/test/Transforms/Coroutines/coro-split-eh-00.ll
--- a/llvm/test/Transforms/Coroutines/coro-split-eh-00.ll
+++ b/llvm/test/Transforms/Coroutines/coro-split-eh-00.ll
@@ -67,6 +67,9 @@
 ; CHECK-NEXT:      %lpval = landingpad { i8*, i32 }
 ; CHECK-NEXT:         cleanup
 ; CHECK-NEXT:      call void @print(i32 2)
+; Checks that the coroutine would be marked as done if it exits in unwinding path.
+; CHECK-NEXT:      %[[RESUME_ADDR:.+]] = getelementptr inbounds %[[FRAME_TY:.+]], %[[FRAME_TY]]* %FramePtr, i32 0, i32 0
+; CHECK-NEXT:      store void (%[[FRAME_TY]]*)* null, void (%[[FRAME_TY]]*)** %[[RESUME_ADDR]], align 8
 ; CHECK-NEXT:      resume { i8*, i32 } %lpval
 
 declare i8* @llvm.coro.free(token, i8*)
diff --git a/llvm/test/Transforms/Coroutines/coro-split-eh-01.ll b/llvm/test/Transforms/Coroutines/coro-split-eh-01.ll
--- a/llvm/test/Transforms/Coroutines/coro-split-eh-01.ll
+++ b/llvm/test/Transforms/Coroutines/coro-split-eh-01.ll
@@ -61,6 +61,9 @@
 ; CHECK:      lpad:
 ; CHECK-NEXT:   %tok = cleanuppad within none []
 ; CHECK-NEXT:   call void @print(i32 2)
+; Checks that the coroutine would be marked as done if it exits in unwinding path.
+; CHECK-NEXT:   %[[RESUME_ADDR:.+]] = getelementptr inbounds %[[FRAME_TY:.+]], %[[FRAME_TY]]* %FramePtr, i32 0, i32 0
+; CHECK-NEXT:   store void (%[[FRAME_TY]]*)* null, void (%[[FRAME_TY]]*)** %[[RESUME_ADDR]], align 8
 ; CHECK-NEXT:   cleanupret from %tok unwind to caller
 
 declare i8* @llvm.coro.free(token, i8*)