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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             E X P _ S M E M                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1998-2008, 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.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package contains routines involved in the required expansions for

--  handling shared memory accesses for variables in Shared_Passive packages.

--  See detailed documentation in System.Shared_Storage spec for a full

--  description of the approach that is taken for handling distributed

--  shared memory. This expansion unit in the compiler is responsible

--  for generating the calls to routines in System.Shared_Storage.

with Types; use Types;

package Exp_Smem is

   procedure Expand_Shared_Passive_Variable (N : Node_Id);

   --  N is the identifier for a shared passive variable. This routine is

   --  responsible for determining if this is an assigned to N, or a

   --  reference to N, and generating the required calls to the shared

   --  memory read/write procedures.

   procedure Add_Shared_Var_Lock_Procs (N : Node_Id);

   --  The argument is a protected subprogram call, before it is rewritten

   --  by Exp_Ch9.Build_Protected_Subprogram_Call. This routine, which is

   --  called only in the case of an external call to a protected object

   --  that has Is_Shared_Passive set, deals with installing the required

   --  global lock calls for this case. It also generates the necessary

   --  read/write calls for the protected object within the lock region.

   function Make_Shared_Var_Procs (N : Node_Id) return Node_Id;

   --  N is the node for the declaration of a shared passive variable.

   --  This procedure constructs an instantiation of

   --  System.Shared_Storage.Shared_Var_Procs that contains the read and

   --  assignment procedures for the shared memory variable.

   --  See System.Shared_Storage for a full description of these procedures

   --  and how they are used. The last inserted node is returned.

end Exp_Smem;