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) 1998-2008, 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 3,  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 COPYING3.  If not, go to --
19-- http://www.gnu.org/licenses for a complete copy of the license.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26--  This package contains routines involved in the required expansions for
27--  handling shared memory accesses for variables in Shared_Passive packages.
28
29--  See detailed documentation in System.Shared_Storage spec for a full
30--  description of the approach that is taken for handling distributed
31--  shared memory. This expansion unit in the compiler is responsible
32--  for generating the calls to routines in System.Shared_Storage.
33
34with Types; use Types;
35package Exp_Smem is
36
37   procedure Expand_Shared_Passive_Variable (N : Node_Id);
38   --  N is the identifier for a shared passive variable. This routine is
39   --  responsible for determining if this is an assigned to N, or a
40   --  reference to N, and generating the required calls to the shared
41   --  memory read/write procedures.
42
43   procedure Add_Shared_Var_Lock_Procs (N : Node_Id);
44   --  The argument is a protected subprogram call, before it is rewritten
45   --  by Exp_Ch9.Build_Protected_Subprogram_Call. This routine, which is
46   --  called only in the case of an external call to a protected object
47   --  that has Is_Shared_Passive set, deals with installing the required
48   --  global lock calls for this case. It also generates the necessary
49   --  read/write calls for the protected object within the lock region.
50
51   function Make_Shared_Var_Procs (N : Node_Id) return Node_Id;
52   --  N is the node for the declaration of a shared passive variable.
53   --  This procedure constructs an instantiation of
54   --  System.Shared_Storage.Shared_Var_Procs that contains the read and
55   --  assignment procedures for the shared memory variable.
56   --  See System.Shared_Storage for a full description of these procedures
57   --  and how they are used. The last inserted node is returned.
58
59end Exp_Smem;
60