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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- E X P _ S M E M --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1998-2014, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- This package contains routines involved in the required expansions for
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27 -- handling shared memory accesses for variables in Shared_Passive packages.
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28
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29 -- See detailed documentation in System.Shared_Storage spec for a full
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30 -- description of the approach that is taken for handling distributed
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31 -- shared memory. This expansion unit in the compiler is responsible
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32 -- for generating the calls to routines in System.Shared_Storage.
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33
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34 with Types; use Types;
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35 package Exp_Smem is
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36
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37 procedure Expand_Shared_Passive_Variable (N : Node_Id);
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38 -- N is the identifier for a shared passive variable. This routine is
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39 -- responsible for determining if this is an assigned to N, or a
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40 -- reference to N, and generating the required calls to the shared
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41 -- memory read/write procedures.
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42
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43 procedure Add_Shared_Var_Lock_Procs (N : Node_Id);
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44 -- The argument is a protected subprogram call, before it is rewritten
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45 -- by Exp_Ch9.Build_Protected_Subprogram_Call. This routine, which is
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46 -- called only in the case of an external call to a protected object
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47 -- that has Is_Shared_Passive set, deals with installing a transient scope
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48 -- and acquiring the appropriate global lock calls for this case. It also
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49 -- generates the necessary read/write calls for the protected object within
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50 -- the lock region.
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51
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52 function Make_Shared_Var_Procs (N : Node_Id) return Node_Id;
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53 -- N is the node for the declaration of a shared passive variable.
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54 -- This procedure constructs an instantiation of
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55 -- System.Shared_Storage.Shared_Var_Procs that contains the read and
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56 -- assignment procedures for the shared memory variable.
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57 -- See System.Shared_Storage for a full description of these procedures
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58 -- and how they are used. The last inserted node is returned.
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59
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60 end Exp_Smem;
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