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) 1998-2014, 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 a transient scope 48 -- and acquiring the appropriate global lock calls for this case. It also 49 -- generates the necessary read/write calls for the protected object within 50 -- the lock region. 51 52 function Make_Shared_Var_Procs (N : Node_Id) return Node_Id; 53 -- N is the node for the declaration of a shared passive variable. 54 -- This procedure constructs an instantiation of 55 -- System.Shared_Storage.Shared_Var_Procs that contains the read and 56 -- assignment procedures for the shared memory variable. 57 -- See System.Shared_Storage for a full description of these procedures 58 -- and how they are used. The last inserted node is returned. 59 60end Exp_Smem; 61