[ASTImporter] Add support for BuiltinTemplateDecl

Summary:
That decl kind is currently not implemented. BuiltinTemplateDecl is for decls that are hardcoded in the
ASTContext, so we can import them like we do other builtin decls by just taking the equivalent
decl from the target ASTContext.

Reviewers: martong, a.sidorin, shafik

Reviewed By: martong, shafik

Subscribers: rnkovacs, kristina, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D69566

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 54acca7dc62..9477e414cf5 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -44,6 +44,7 @@
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeVisitor.h"
 #include "clang/AST/UnresolvedSet.h"
+#include "clang/Basic/Builtins.h"
 #include "clang/Basic/ExceptionSpecificationType.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/IdentifierTable.h"
@@ -483,6 +484,7 @@ namespace clang {
     ExpectedDecl VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
     ExpectedDecl VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
     ExpectedDecl VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
+    ExpectedDecl VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D);
 
     Expected<ObjCTypeParamList *>
     ImportObjCTypeParamList(ObjCTypeParamList *list);
@@ -4464,6 +4466,20 @@ ExpectedDecl ASTNodeImporter::VisitUnresolvedUsingTypenameDecl(
   return ToUsing;
 }
 
+ExpectedDecl ASTNodeImporter::VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D) {
+  Decl* ToD = nullptr;
+  switch (D->getBuiltinTemplateKind()) {
+  case BuiltinTemplateKind::BTK__make_integer_seq:
+    ToD = Importer.getToContext().getMakeIntegerSeqDecl();
+    break;
+  case BuiltinTemplateKind::BTK__type_pack_element:
+    ToD = Importer.getToContext().getTypePackElementDecl();
+    break;
+  }
+  assert(ToD && "BuiltinTemplateDecl of unsupported kind!");
+  Importer.MapImported(D, ToD);
+  return ToD;
+}
 
 Error ASTNodeImporter::ImportDefinition(
     ObjCInterfaceDecl *From, ObjCInterfaceDecl *To, ImportDefinitionKind Kind) {