1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                             E X P _ S M E M                              --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--           Copyright (C) 1998-2000, Free Software Foundation, Inc.        --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
19-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
22-- GNAT was originally developed  by the GNAT team at  New York University. --
23-- Extensive contributions were provided by Ada Core Technologies Inc.      --
24--                                                                          --
25------------------------------------------------------------------------------
26
27--  This package contains routines involved in the required expansions for
28--  handling shared memory accesses for variables in Shared_Passive packages.
29
30--  See detailed documentation in System.Shared_Storage spec for a full
31--  description of the approach that is taken for handling distributed
32--  shared memory. This expansion unit in the compiler is responsible
33--  for generating the calls to routines in System.Shared_Storage.
34
35with Types; use Types;
36package Exp_Smem is
37
38   procedure Expand_Shared_Passive_Variable (N : Node_Id);
39   --  N is the identifier for a shared passive variable. This routine is
40   --  responsible for determining if this is an assigned to N, or a
41   --  reference to N, and generating the required calls to the shared
42   --  memory read/write procedures.
43
44   procedure Add_Shared_Var_Lock_Procs (N : Node_Id);
45   --  The argument is a protected subprogram call, before it is rewritten
46   --  by Exp_Ch9.Build_Protected_Subprogram_Call. This routine, which is
47   --  called only in the case of an external call to a protected object
48   --  that has Is_Shared_Passive set, deals with installing the required
49   --  global lock calls for this case. It also generates the necessary
50   --  read/write calls for the protected object within the lock region.
51
52   procedure Make_Shared_Var_Procs (N : Node_Id);
53   --  N is the node for the declaration of a shared passive variable. This
54   --  procedure constructs and inserts the read and assignment procedures
55   --  for the shared memory variable. See System.Shared_Storage for a full
56   --  description of these procedures and how they are used.
57
58end Exp_Smem;
59