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diff --git a/include/clang/Sema/DelayedDiagnostic.h b/include/clang/Sema/DelayedDiagnostic.h
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index 000000000000..6a9a1bf5b608
--- /dev/null
+++ b/include/clang/Sema/DelayedDiagnostic.h
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+//===--- DelayedDiagnostic.h - Delayed declarator diagnostics ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the DelayedDiagnostic class, which is used to
+// record diagnostics that are being conditionally produced during
+// declarator parsing.  Certain kinds of diagnostics --- notably
+// deprecation and access control --- are suppressed based on
+// semantic properties of the parsed declaration that aren't known
+// until it is fully parsed.
+//
+// This file also defines AccessedEntity.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_DELAYED_DIAGNOSTIC_H
+#define LLVM_CLANG_SEMA_DELAYED_DIAGNOSTIC_H
+
+#include "clang/AST/DeclCXX.h"
+
+namespace clang {
+namespace sema {
+
+/// A declaration being accessed, together with information about how
+/// it was accessed.
+class AccessedEntity {
+public:
+  /// A member declaration found through lookup.  The target is the
+  /// member.
+  enum MemberNonce { Member };
+
+  /// A hierarchy (base-to-derived or derived-to-base) conversion.
+  /// The target is the base class.
+  enum BaseNonce { Base };
+
+  bool isMemberAccess() const { return IsMember; }
+
+  AccessedEntity(ASTContext &Context,
+                 MemberNonce _,
+                 CXXRecordDecl *NamingClass,
+                 DeclAccessPair FoundDecl,
+                 QualType BaseObjectType)
+    : Access(FoundDecl.getAccess()), IsMember(true),
+      Target(FoundDecl.getDecl()), NamingClass(NamingClass),
+      BaseObjectType(BaseObjectType), Diag(0, Context.getDiagAllocator()) {
+  }
+
+  AccessedEntity(ASTContext &Context,
+                 BaseNonce _,
+                 CXXRecordDecl *BaseClass,
+                 CXXRecordDecl *DerivedClass,
+                 AccessSpecifier Access)
+    : Access(Access), IsMember(false),
+      Target(BaseClass),
+      NamingClass(DerivedClass),
+      Diag(0, Context.getDiagAllocator()) {
+  }
+
+  bool isQuiet() const { return Diag.getDiagID() == 0; }
+
+  AccessSpecifier getAccess() const { return AccessSpecifier(Access); }
+
+  // These apply to member decls...
+  NamedDecl *getTargetDecl() const { return Target; }
+  CXXRecordDecl *getNamingClass() const { return NamingClass; }
+
+  // ...and these apply to hierarchy conversions.
+  CXXRecordDecl *getBaseClass() const {
+    assert(!IsMember); return cast<CXXRecordDecl>(Target);
+  }
+  CXXRecordDecl *getDerivedClass() const { return NamingClass; }
+
+  /// Retrieves the base object type, important when accessing
+  /// an instance member.
+  QualType getBaseObjectType() const { return BaseObjectType; }
+
+  /// Sets a diagnostic to be performed.  The diagnostic is given
+  /// four (additional) arguments:
+  ///   %0 - 0 if the entity was private, 1 if protected
+  ///   %1 - the DeclarationName of the entity
+  ///   %2 - the TypeDecl type of the naming class
+  ///   %3 - the TypeDecl type of the declaring class
+  void setDiag(const PartialDiagnostic &PDiag) {
+    assert(isQuiet() && "partial diagnostic already defined");
+    Diag = PDiag;
+  }
+  PartialDiagnostic &setDiag(unsigned DiagID) {
+    assert(isQuiet() && "partial diagnostic already defined");
+    assert(DiagID && "creating null diagnostic");
+    Diag.Reset(DiagID);
+    return Diag;
+  }
+  const PartialDiagnostic &getDiag() const {
+    return Diag;
+  }
+
+private:
+  unsigned Access : 2;
+  bool IsMember;
+  NamedDecl *Target;
+  CXXRecordDecl *NamingClass;
+  QualType BaseObjectType;
+  PartialDiagnostic Diag;
+};
+
+/// A diagnostic message which has been conditionally emitted pending
+/// the complete parsing of the current declaration.
+class DelayedDiagnostic {
+public:
+  enum DDKind { Deprecation, Access };
+
+  unsigned char Kind; // actually a DDKind
+  bool Triggered;
+
+  SourceLocation Loc;
+
+  union {
+    /// Deprecation.
+    struct { NamedDecl *Decl; } DeprecationData;
+
+    /// Access control.
+    char AccessData[sizeof(AccessedEntity)];
+  };
+
+  void destroy() {
+    switch (Kind) {
+    case Access: getAccessData().~AccessedEntity(); break;
+    case Deprecation: break;
+    }
+  }
+
+  static DelayedDiagnostic makeDeprecation(SourceLocation Loc,
+                                           NamedDecl *D) {
+    DelayedDiagnostic DD;
+    DD.Kind = Deprecation;
+    DD.Triggered = false;
+    DD.Loc = Loc;
+    DD.DeprecationData.Decl = D;
+    return DD;
+  }
+
+  static DelayedDiagnostic makeAccess(SourceLocation Loc,
+                                      const AccessedEntity &Entity) {
+    DelayedDiagnostic DD;
+    DD.Kind = Access;
+    DD.Triggered = false;
+    DD.Loc = Loc;
+    new (&DD.getAccessData()) AccessedEntity(Entity);
+    return DD;
+  }
+
+  AccessedEntity &getAccessData() {
+    return *reinterpret_cast<AccessedEntity*>(AccessData);
+  }
+  const AccessedEntity &getAccessData() const {
+    return *reinterpret_cast<const AccessedEntity*>(AccessData);
+  }
+};
+
+}
+}
+
+#endif