Support C++ friend declarations for PCH.

This commit 'introduces' a slightly different way to restore the state of the AST object.
It makes PCHDeclReader/PCHDeclWriter friends and gives them access to the private members of the object.
The rationale is to avoid using/modifying the AST interfaces for PCH read/write so that to:

-Avoid complications with objects that have side-effects during creation or when using some setters.
-Not 'pollute' the AST interface with methods only used by the PCH reader/writer
-Allow AST objects to be read-only.

llvm-svn: 107219

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclFriend.cpp b/clang/lib/AST/DeclFriend.cpp
index ab3552db28e..99bfe40c31f 100644
--- a/clang/lib/AST/DeclFriend.cpp
+++ b/clang/lib/AST/DeclFriend.cpp
@@ -39,3 +39,7 @@ FriendDecl *FriendDecl::Create(ASTContext &C, DeclContext *DC,
   cast<CXXRecordDecl>(DC)->pushFriendDecl(FD);
   return FD;
 }
+
+FriendDecl *FriendDecl::Create(ASTContext &C, EmptyShell Empty) {
+  return new (C) FriendDecl(Empty);
+}