[NFC] Move TypeOrExtensionDecl out of PrintOptions.h.

Author: huonw

include/swift/AST/PrintOptions.h

@@ -16,6 +16,7 @@
 #include "swift/Basic/STLExtras.h"
 #include "swift/AST/AttrKind.h"
 #include "swift/AST/Identifier.h"
+#include "swift/AST/TypeOrExtensionDecl.h"
 #include "llvm/ADT/Optional.h"
 #include <limits.h>
 #include <vector>
@@ -36,32 +37,6 @@ enum DeclAttrKind : unsigned;
 class SynthesizedExtensionAnalyzer;
 struct PrintOptions;
 
-/// \brief Describes either a nominal type declaration or an extension
-/// declaration.
-struct TypeOrExtensionDecl {
-  llvm::PointerUnion<NominalTypeDecl *, ExtensionDecl *> Decl;
-
-  TypeOrExtensionDecl() = default;
-
-  TypeOrExtensionDecl(NominalTypeDecl *D);
-  TypeOrExtensionDecl(ExtensionDecl *D);
-
-  /// \brief Return the contained *Decl as the Decl superclass.
-  class Decl *getAsDecl() const;
-  /// \brief Return the contained *Decl as the DeclContext superclass.
-  DeclContext *getAsDeclContext() const;
-  /// \brief Return the contained NominalTypeDecl or that of the extended type
-  /// in the ExtensionDecl.
-  NominalTypeDecl *getBaseNominal() const;
-
-  /// \brief Is the contained pointer null?
-  bool isNull() const;
-  explicit operator bool() const { return !isNull(); }
-
-  bool operator==(TypeOrExtensionDecl rhs) { return Decl == rhs.Decl; }
-  bool operator!=(TypeOrExtensionDecl rhs) { return Decl != rhs.Decl; }
-  bool operator<(TypeOrExtensionDecl rhs) { return Decl < rhs.Decl; }
-};
 
 /// Necessary information for archetype transformation during printing.
 struct TypeTransformContext {

include/swift/AST/TypeOrExtensionDecl.h

@@ -0,0 +1,59 @@
+//===- TypeOrExtensionDecl.h - Swift Language Declaration ASTs -*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the TypeOrExtensionDecl struct, separately to Decl.h so
+// that this can be included in files that Decl.h includes.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_TYPE_OR_EXTENSION_DECL_H
+#define SWIFT_TYPE_OR_EXTENSION_DECL_H
+
+#include "llvm/ADT/PointerUnion.h"
+
+namespace swift {
+class Decl;
+class NominalTypeDecl;
+class ExtensionDecl;
+class DeclContext;
+
+/// \brief Describes either a nominal type declaration or an extension
+/// declaration.
+struct TypeOrExtensionDecl {
+  // (The definitions are in Decl.cpp.)
+  llvm::PointerUnion<NominalTypeDecl *, ExtensionDecl *> Decl;
+
+  TypeOrExtensionDecl() = default;
+
+  TypeOrExtensionDecl(NominalTypeDecl *D);
+  TypeOrExtensionDecl(ExtensionDecl *D);
+
+  /// \brief Return the contained *Decl as the Decl superclass.
+  class Decl *getAsDecl() const;
+  /// \brief Return the contained *Decl as the DeclContext superclass.
+  DeclContext *getAsDeclContext() const;
+  /// \brief Return the contained NominalTypeDecl or that of the extended type
+  /// in the ExtensionDecl.
+  NominalTypeDecl *getBaseNominal() const;
+
+  /// \brief Is the contained pointer null?
+  bool isNull() const;
+  explicit operator bool() const { return !isNull(); }
+
+  bool operator==(TypeOrExtensionDecl rhs) { return Decl == rhs.Decl; }
+  bool operator!=(TypeOrExtensionDecl rhs) { return Decl != rhs.Decl; }
+  bool operator<(TypeOrExtensionDecl rhs) { return Decl < rhs.Decl; }
+};
+
+} // end namespace swift
+
+#endif

lib/AST/ASTPrinter.cpp

@@ -63,23 +63,6 @@ void PrintOptions::clearSynthesizedExtension() {
   TransformContext.reset();
 }
 
-TypeOrExtensionDecl::TypeOrExtensionDecl(NominalTypeDecl *D) : Decl(D) {}
-TypeOrExtensionDecl::TypeOrExtensionDecl(ExtensionDecl *D) : Decl(D) {}
-
-Decl *TypeOrExtensionDecl::getAsDecl() const {
-  if (auto NTD = Decl.dyn_cast<NominalTypeDecl *>())
-    return NTD;
-
-  return Decl.get<ExtensionDecl *>();
-}
-DeclContext *TypeOrExtensionDecl::getAsDeclContext() const {
-  return getAsDecl()->getInnermostDeclContext();
-}
-NominalTypeDecl *TypeOrExtensionDecl::getBaseNominal() const {
-  return getAsDeclContext()->getAsNominalTypeOrNominalTypeExtensionContext();
-}
-bool TypeOrExtensionDecl::isNull() const { return Decl.isNull(); }
-
 TypeTransformContext::TypeTransformContext(Type T)
     : BaseType(T.getPointer()) {
   assert(T->mayHaveMembers());

lib/AST/Decl.cpp

@@ -5548,3 +5548,21 @@ void ClassDecl::setSuperclass(Type superclass) {
          && "superclass must be interface type");
   LazySemanticInfo.Superclass.setPointerAndInt(superclass, true);
 }
+
+TypeOrExtensionDecl::TypeOrExtensionDecl(NominalTypeDecl *D) : Decl(D) {}
+TypeOrExtensionDecl::TypeOrExtensionDecl(ExtensionDecl *D) : Decl(D) {}
+
+Decl *TypeOrExtensionDecl::getAsDecl() const {
+  if (auto NTD = Decl.dyn_cast<NominalTypeDecl *>())
+    return NTD;
+
+  return Decl.get<ExtensionDecl *>();
+}
+DeclContext *TypeOrExtensionDecl::getAsDeclContext() const {
+  return getAsDecl()->getInnermostDeclContext();
+}
+NominalTypeDecl *TypeOrExtensionDecl::getBaseNominal() const {
+  return getAsDeclContext()->getAsNominalTypeOrNominalTypeExtensionContext();
+}
+bool TypeOrExtensionDecl::isNull() const { return Decl.isNull(); }
+