--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/d/dmd/identifier.h	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,49 @@
+
+/* Compiler implementation of the D programming language
+ * Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved
+ * written by Walter Bright
+ * 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/identifier.h
+ */
+
+#pragma once
+
+#include "root/root.h"
+#include "root/stringtable.h"
+
+class Identifier : public RootObject
+{
+private:
+    int value;
+    const char *string;
+    size_t len;
+
+public:
+    Identifier(const char *string, size_t length, int value);
+    Identifier(const char *string);
+    static Identifier* create(const char *string);
+    bool equals(RootObject *o);
+    int compare(RootObject *o);
+    void print();
+    const char *toChars();
+    int getValue() const;
+    const char *toHChars2();
+    int dyncast() const;
+
+    static StringTable stringtable;
+    static Identifier *generateId(const char *prefix);
+    static Identifier *generateId(const char *prefix, size_t i);
+    static Identifier *idPool(const char *s, size_t len);
+    static Identifier *idPool(const char *s, size_t len, int value);
+
+    static inline Identifier *idPool(const char *s)
+    {
+        return idPool(s, strlen(s));
+    }
+
+    static bool isValidIdentifier(const char *p);
+    static Identifier *lookup(const char *s, size_t len);
+    static void initTable();
+};