[Async CC] Add ResumeParent to async context.

Author: nate-chandler

lib/IRGen/GenCall.cpp

@@ -111,6 +111,15 @@ AsyncContextLayout irgen::getAsyncContextLayout(
     typeInfos.push_back(&ti);
   }
 
+  // TaskContinuationFunction * __ptrauth_swift_async_context_resume
+  //     ResumeParent;
+  {
+    auto ty = SILType();
+    auto &ti = IGF.IGM.getTaskContinuationFunctionPtrTypeInfo();
+    valTypes.push_back(ty);
+    typeInfos.push_back(&ti);
+  }
+
   //   SwiftError *errorResult;
   auto errorCanType = IGF.IGM.Context.getExceptionType();
   auto errorType = SILType::getPrimitiveObjectType(errorCanType);

lib/IRGen/GenCall.h

@@ -94,10 +94,12 @@ namespace irgen {
   private:
     enum class FixedIndex : unsigned {
       Parent = 0,
-      Error = 1,
+      ResumeParent = 1,
+      Error = 2,
     };
     enum class FixedCount : unsigned {
       Parent = 1,
+      ResumeParent = 1,
       Error = 1,
     };
     IRGenFunction &IGF;
@@ -114,6 +116,9 @@ namespace irgen {
     SmallVector<ArgumentInfo, 4> argumentInfos;
 
     unsigned getParentIndex() { return (unsigned)FixedIndex::Parent; }
+    unsigned getResumeParentIndex() {
+      return (unsigned)FixedIndex::ResumeParent;
+    }
     unsigned getErrorIndex() { return (unsigned)FixedIndex::Error; }
     unsigned getFirstIndirectReturnIndex() {
       return getErrorIndex() + getErrorCount();
@@ -160,6 +165,9 @@ namespace irgen {
 
   public:
     ElementLayout getParentLayout() { return getElement(getParentIndex()); }
+    ElementLayout getResumeParentLayout() {
+      return getElement(getResumeParentIndex());
+    }
     bool canHaveError() { return canHaveValidError; }
     ElementLayout getErrorLayout() { return getElement(getErrorIndex()); }
     unsigned getErrorCount() { return (unsigned)FixedCount::Error; }