--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/repinfo-input.ads	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,78 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                         R E P I N F O - I N P U T                        --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2018-2019, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides an alternate way of populating the internal tables
+--  of Repinfo from a JSON input rather than the binary blob of the tree file.
+--  Note that this is an additive mechanism, i.e. nothing is destroyed in the
+--  internal state of the unit when it is used.
+
+--  The first step is to feed the unit with a JSON stream of a specified format
+--  (see the spec of Repinfo for its description) by means of Read_JSON_Stream.
+--  Then, for each entity whose representation information is present in the
+--  JSON stream, the appropriate Get_JSON_* routines can be invoked to override
+--  the eponymous fields of the entity in the tree.
+
+package Repinfo.Input is
+
+   function Get_JSON_Esize (Name : String) return Node_Ref_Or_Val;
+   --  Returns the Esize value of the entity specified by Name, which is not
+   --  the component of a record type, or else No_Uint if no representation
+   --  information was supplied for the entity. Name is the full qualified name
+   --  of the entity in lower case letters.
+
+   function Get_JSON_RM_Size (Name : String) return Node_Ref_Or_Val;
+   --  Likewise for the RM_Size
+
+   function Get_JSON_Component_Size (Name : String) return Node_Ref_Or_Val;
+   --  Likewise for the Component_Size of an array type
+
+   function Get_JSON_Component_Bit_Offset
+     (Name        : String;
+      Record_Name : String) return Node_Ref_Or_Val;
+   --  Returns the Component_Bit_Offset of the component specified by Name,
+   --  which is declared in the record type specified by Record_Name, or else
+   --  No_Uint if no representation information was supplied for the component.
+   --  Name is the unqualified name of the component whereas Record_Name is the
+   --  full qualified name of the record type, both in lower case letters.
+
+   function Get_JSON_Esize
+     (Name        : String;
+      Record_Name : String) return Node_Ref_Or_Val;
+   --  Likewise for the Esize
+
+   Invalid_JSON_Stream : exception;
+   --  Raised if a format error is detected in the JSON stream
+
+   procedure Read_JSON_Stream (Text : Text_Buffer; File_Name : String);
+   --  Reads a JSON stream and populates internal tables from it. File_Name is
+   --  only used in error messages issued by the JSON parser.
+
+end Repinfo.Input;