Remove mutable data on TagType and InjectedClassNameType, by instead walking the declaration chain in search of a definition. This is necessary for a sane chained PCH implementation. No observable performance change on Carbon.h syntax-only, and bootstraps cleanly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110051 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/include/clang/AST/Decl.h b/include/clang/AST/Decl.h
index 9647d0145e..169b74e01b 100644
--- a/include/clang/AST/Decl.h
+++ b/include/clang/AST/Decl.h
@@ -1814,6 +1814,9 @@ private:
   /// it is a declaration ("struct foo;").
   bool IsDefinition : 1;
 
+  /// IsBeingDefined - True if this is currently being defined.
+  bool IsBeingDefined : 1;
+
   /// IsEmbeddedInDeclarator - True if this tag declaration is
   /// "embedded" (i.e., defined or declared for the very first time)
   /// in the syntax of a declarator.
@@ -1855,6 +1858,7 @@ protected:
            "EnumDecl not matched with TTK_Enum");
     TagDeclKind = TK;
     IsDefinition = false;
+    IsBeingDefined = false;
     IsEmbeddedInDeclarator = false;
     setPreviousDeclaration(PrevDecl);
   }
@@ -1896,6 +1900,11 @@ public:
     return IsDefinition;
   }
 
+  /// isBeingDefined - Return true if this decl is currently being defined.
+  bool isBeingDefined() const {
+    return IsBeingDefined;
+  }
+
   bool isEmbeddedInDeclarator() const {
     return IsEmbeddedInDeclarator;
   }