Merge pull request swiftlang#34102 from varungandhi-apple/vg-gate-clang-type-serde

[Serialization] Gate Clang type (de)serialization behind UseClangFunctionTypes

Author: varungandhi-apple

lib/Serialization/Deserialization.cpp

@@ -5799,6 +5799,9 @@ class SwiftToClangBasicReader :
 
 llvm::Expected<const clang::Type *>
 ModuleFile::getClangType(ClangTypeID TID) {
+  if (!getContext().LangOpts.UseClangFunctionTypes)
+    return nullptr;
+
   if (TID == 0)
     return nullptr;
 

lib/Serialization/Serialization.cpp

@@ -4140,7 +4140,10 @@ class Serializer::TypeSerializer : public TypeVisitor<TypeSerializer> {
     using namespace decls_block;
 
     auto resultType = S.addTypeRef(fnTy->getResult());
-    auto clangType = S.addClangTypeRef(fnTy->getClangTypeInfo().getType());
+    auto clangType =
+      S.getASTContext().LangOpts.UseClangFunctionTypes
+      ? S.addClangTypeRef(fnTy->getClangTypeInfo().getType())
+      : ClangTypeID(0);
 
     unsigned abbrCode = S.DeclTypeAbbrCodes[FunctionTypeLayout::Code];
     FunctionTypeLayout::emitRecord(S.Out, S.ScratchRecord, abbrCode,

test/Sema/clang_types_in_ast.swift

@@ -3,12 +3,14 @@
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH1 -use-clang-function-types
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH2 -sdk %clang-importer-sdk
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH2 -sdk %clang-importer-sdk -use-clang-function-types
-// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t
 
 // rdar://problem/57644243 : We shouldn't crash if -use-clang-function-types is not enabled.
+// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t
 // RUN: %target-swift-frontend %s -typecheck -DNOCRASH3 -I %t
 
-// RUN: %target-swift-frontend %s -typecheck -DCRASH -I %t -use-clang-function-types
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend %s -DAUXMODULE -module-name Foo -emit-module -o %t -use-clang-function-types
+// RUN: %target-swift-frontend %s -typecheck -DNOCRASH3 -I %t -use-clang-function-types
 
 #if NOCRASH1
 public func my_signal() -> Optional<@convention(c) (Int32) -> Void> {
@@ -45,19 +47,3 @@ public func my_signal4() -> Optional<@convention(c) (Int32) -> Void> {
   return Foo.DUMMY_SIGNAL2
 }
 #endif
-
-#if CRASH
-import Foo
-public func my_signal1() -> Optional<@convention(c) (Int32) -> ()> {
-  return Foo.DUMMY_SIGNAL1
-}
-public func my_signal2() -> Optional<@convention(c) (Int32) -> Void> {
-  return Foo.DUMMY_SIGNAL1
-}
-public func my_signal3() -> Optional<@convention(c) (Int32) -> ()> {
-  return Foo.DUMMY_SIGNAL2
-}
-public func my_signal4() -> Optional<@convention(c) (Int32) -> Void> {
-  return Foo.DUMMY_SIGNAL2
-}
-#endif