--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/d/dmd/objc.h	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,53 @@
+
+/* Compiler implementation of the D programming language
+ * Copyright (C) 2015-2019 by The D Language Foundation, All Rights Reserved
+ * written by Michel Fortin
+ * http://www.digitalmars.com
+ * Distributed under the Boost Software License, Version 1.0.
+ * http://www.boost.org/LICENSE_1_0.txt
+ * https://github.com/dlang/dmd/blob/master/src/dmd/objc.h
+ */
+
+#pragma once
+
+#include "root/root.h"
+#include "root/stringtable.h"
+
+class Identifier;
+class FuncDeclaration;
+class ClassDeclaration;
+class InterfaceDeclaration;
+struct Scope;
+class StructDeclaration;
+
+struct ObjcSelector
+{
+    static StringTable stringtable;
+    static StringTable vTableDispatchSelectors;
+    static int incnum;
+
+    const char *stringvalue;
+    size_t stringlen;
+    size_t paramCount;
+
+    static void _init();
+
+    ObjcSelector(const char *sv, size_t len, size_t pcount);
+
+    static ObjcSelector *lookup(const char *s);
+    static ObjcSelector *lookup(const char *s, size_t len, size_t pcount);
+
+    static ObjcSelector *create(FuncDeclaration *fdecl);
+};
+
+class Objc
+{
+public:
+    static void _init();
+
+    virtual void setObjc(ClassDeclaration* cd) = 0;
+    virtual void setObjc(InterfaceDeclaration*) = 0;
+    virtual void setSelector(FuncDeclaration*, Scope* sc) = 0;
+    virtual void validateSelector(FuncDeclaration* fd) = 0;
+    virtual void checkLinkage(FuncDeclaration* fd) = 0;
+};