395 lines
13 KiB
Ada
395 lines
13 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ S M E M --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1998-2008, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Atree; use Atree;
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with Einfo; use Einfo;
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with Exp_Ch9; use Exp_Ch9;
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with Exp_Util; use Exp_Util;
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with Nmake; use Nmake;
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with Namet; use Namet;
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with Nlists; use Nlists;
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with Rtsfind; use Rtsfind;
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with Sem; use Sem;
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with Sem_Aux; use Sem_Aux;
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with Sem_Util; use Sem_Util;
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with Sinfo; use Sinfo;
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with Snames; use Snames;
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with Stand; use Stand;
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with Stringt; use Stringt;
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with Tbuild; use Tbuild;
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package body Exp_Smem is
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Insert_Node : Node_Id;
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-- Node after which a write call is to be inserted
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Add_Read_Before (N : Node_Id);
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-- Insert a Shared_Var_ROpen call for variable before node N
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procedure Add_Write_After (N : Node_Id);
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-- Insert a Shared_Var_WOpen call for variable after the node
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-- Insert_Node, as recorded by On_Lhs_Of_Assignment (where it points
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-- to the assignment statement) or Is_Out_Actual (where it points to
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-- the procedure call statement).
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procedure Build_Full_Name (E : Entity_Id; N : out String_Id);
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-- Build the fully qualified string name of a shared variable
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function On_Lhs_Of_Assignment (N : Node_Id) return Boolean;
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-- Determines if N is on the left hand of the assignment. This means
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-- that either it is a simple variable, or it is a record or array
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-- variable with a corresponding selected or indexed component on
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-- the left side of an assignment. If the result is True, then
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-- Insert_Node is set to point to the assignment
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function Is_Out_Actual (N : Node_Id) return Boolean;
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-- In a similar manner, this function determines if N appears as an
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-- OUT or IN OUT parameter to a procedure call. If the result is
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-- True, then Insert_Node is set to point to the call.
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function Build_Shared_Var_Proc_Call
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(Loc : Source_Ptr;
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E : Node_Id;
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N : Name_Id) return Node_Id;
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-- Build a call to support procedure N for shared object E (provided by
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-- the instance of System.Shared_Storage.Shared_Var_Procs associated to E).
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--------------------------------
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-- Build_Shared_Var_Proc_Call --
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--------------------------------
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function Build_Shared_Var_Proc_Call
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(Loc : Source_Ptr;
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E : Entity_Id;
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N : Name_Id) return Node_Id is
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begin
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return Make_Procedure_Call_Statement (Loc,
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Name => Make_Selected_Component (Loc,
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Prefix =>
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New_Occurrence_Of (Shared_Var_Procs_Instance (E), Loc),
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Selector_Name => Make_Identifier (Loc, Chars => N)));
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end Build_Shared_Var_Proc_Call;
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---------------------
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-- Add_Read_Before --
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---------------------
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procedure Add_Read_Before (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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Ent : constant Node_Id := Entity (N);
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begin
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if Present (Shared_Var_Procs_Instance (Ent)) then
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Insert_Action (N, Build_Shared_Var_Proc_Call (Loc, Ent, Name_Read));
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end if;
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end Add_Read_Before;
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-------------------------------
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-- Add_Shared_Var_Lock_Procs --
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-------------------------------
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procedure Add_Shared_Var_Lock_Procs (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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Obj : constant Entity_Id := Entity (Expression (First_Actual (N)));
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Inode : Node_Id;
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Vnm : String_Id;
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begin
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-- We have to add Shared_Var_Lock and Shared_Var_Unlock calls around
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-- the procedure or function call node. First we locate the right
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-- place to do the insertion, which is the call itself in the
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-- procedure call case, or else the nearest non subexpression
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-- node that contains the function call.
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Inode := N;
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while Nkind (Inode) /= N_Procedure_Call_Statement
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and then Nkind (Inode) in N_Subexpr
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loop
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Inode := Parent (Inode);
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end loop;
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-- Now insert the Lock and Unlock calls and the read/write calls
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-- Two concerns here. First we are not dealing with the exception
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-- case, really we need some kind of cleanup routine to do the
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-- Unlock. Second, these lock calls should be inside the protected
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-- object processing, not outside, otherwise they can be done at
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-- the wrong priority, resulting in dead lock situations ???
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Build_Full_Name (Obj, Vnm);
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-- First insert the Lock call before
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Insert_Before_And_Analyze (Inode,
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Make_Procedure_Call_Statement (Loc,
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Name => New_Occurrence_Of (RTE (RE_Shared_Var_Lock), Loc),
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Parameter_Associations => New_List (
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Make_String_Literal (Loc, Vnm))));
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-- Now, right after the Lock, insert a call to read the object
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Insert_Before_And_Analyze (Inode,
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Build_Shared_Var_Proc_Call (Loc, Obj, Name_Read));
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-- Now insert the Unlock call after
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Insert_After_And_Analyze (Inode,
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Make_Procedure_Call_Statement (Loc,
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Name => New_Occurrence_Of (RTE (RE_Shared_Var_Unlock), Loc),
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Parameter_Associations => New_List (
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Make_String_Literal (Loc, Vnm))));
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-- Now for a procedure call, but not a function call, insert the
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-- call to write the object just before the unlock.
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if Nkind (N) = N_Procedure_Call_Statement then
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Insert_After_And_Analyze (Inode,
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Build_Shared_Var_Proc_Call (Loc, Obj, Name_Write));
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end if;
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end Add_Shared_Var_Lock_Procs;
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---------------------
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-- Add_Write_After --
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---------------------
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procedure Add_Write_After (N : Node_Id) is
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Loc : constant Source_Ptr := Sloc (N);
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Ent : constant Node_Id := Entity (N);
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begin
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if Present (Shared_Var_Procs_Instance (Ent)) then
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Insert_After_And_Analyze (Insert_Node,
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Build_Shared_Var_Proc_Call (Loc, Ent, Name_Write));
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end if;
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end Add_Write_After;
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---------------------
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-- Build_Full_Name --
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---------------------
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procedure Build_Full_Name (E : Entity_Id; N : out String_Id) is
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procedure Build_Name (E : Entity_Id);
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-- This is a recursive routine used to construct the fully qualified
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-- string name of the package corresponding to the shared variable.
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----------------
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-- Build_Name --
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----------------
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procedure Build_Name (E : Entity_Id) is
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begin
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if Scope (E) /= Standard_Standard then
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Build_Name (Scope (E));
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Store_String_Char ('.');
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end if;
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Get_Decoded_Name_String (Chars (E));
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Store_String_Chars (Name_Buffer (1 .. Name_Len));
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end Build_Name;
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-- Start of processing for Build_Full_Name
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begin
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Start_String;
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Build_Name (E);
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N := End_String;
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end Build_Full_Name;
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------------------------------------
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-- Expand_Shared_Passive_Variable --
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------------------------------------
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procedure Expand_Shared_Passive_Variable (N : Node_Id) is
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Typ : constant Entity_Id := Etype (N);
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begin
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-- Nothing to do for protected or limited objects
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if Is_Limited_Type (Typ) or else Is_Concurrent_Type (Typ) then
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return;
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-- If we are on the left hand side of an assignment, then we add
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-- the write call after the assignment.
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elsif On_Lhs_Of_Assignment (N) then
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Add_Write_After (N);
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-- If we are a parameter for an out or in out formal, then put
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-- the read before and the write after.
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elsif Is_Out_Actual (N) then
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Add_Read_Before (N);
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Add_Write_After (N);
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-- All other cases are simple reads
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else
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Add_Read_Before (N);
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end if;
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end Expand_Shared_Passive_Variable;
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-------------------
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-- Is_Out_Actual --
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-------------------
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function Is_Out_Actual (N : Node_Id) return Boolean is
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Formal : Entity_Id;
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Call : Node_Id;
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begin
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Find_Actual (N, Formal, Call);
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if No (Formal) then
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return False;
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else
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if Ekind (Formal) = E_Out_Parameter
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or else
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Ekind (Formal) = E_In_Out_Parameter
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then
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Insert_Node := Call;
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return True;
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else
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return False;
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end if;
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end if;
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end Is_Out_Actual;
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---------------------------
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-- Make_Shared_Var_Procs --
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---------------------------
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function Make_Shared_Var_Procs (N : Node_Id) return Node_Id is
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Loc : constant Source_Ptr := Sloc (N);
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Ent : constant Entity_Id := Defining_Identifier (N);
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Typ : constant Entity_Id := Etype (Ent);
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Vnm : String_Id;
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Obj : Node_Id;
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Obj_Typ : Entity_Id;
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After : constant Node_Id := Next (N);
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-- Node located right after N originally (after insertion of the SV
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-- procs this node is right after the last inserted node).
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SVP_Instance : constant Entity_Id := Make_Defining_Identifier (Loc,
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Chars => New_External_Name (Chars (Ent), 'G'));
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-- Instance of System.Shared_Storage.Shared_Var_Procs associated
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-- with Ent.
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Instantiation : Node_Id;
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-- Package instantiation node for SVP_Instance
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-- Start of processing for Make_Shared_Var_Procs
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begin
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Build_Full_Name (Ent, Vnm);
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-- We turn off Shared_Passive during construction and analysis of
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-- the generic package instantiation, to avoid improper attempts to
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-- process the variable references within these instantiation.
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Set_Is_Shared_Passive (Ent, False);
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-- Construct generic package instantiation
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-- package varG is new Shared_Var_Procs (typ, var, "pkg.var");
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Obj := New_Occurrence_Of (Ent, Loc);
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Obj_Typ := Typ;
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if Is_Concurrent_Type (Typ) then
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Obj := Convert_Concurrent (N => Obj, Typ => Typ);
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Obj_Typ := Corresponding_Record_Type (Typ);
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end if;
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Instantiation :=
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Make_Package_Instantiation (Loc,
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Defining_Unit_Name => SVP_Instance,
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Name =>
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New_Occurrence_Of (RTE (RE_Shared_Var_Procs), Loc),
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Generic_Associations => New_List (
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Make_Generic_Association (Loc,
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Explicit_Generic_Actual_Parameter =>
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New_Occurrence_Of (Obj_Typ, Loc)),
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Make_Generic_Association (Loc,
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Explicit_Generic_Actual_Parameter => Obj),
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Make_Generic_Association (Loc,
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Explicit_Generic_Actual_Parameter =>
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Make_String_Literal (Loc, Vnm))));
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Insert_After_And_Analyze (N, Instantiation);
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Set_Is_Shared_Passive (Ent, True);
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Set_Shared_Var_Procs_Instance
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(Ent, Defining_Entity (Instance_Spec (Instantiation)));
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-- Return last node before After
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declare
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Nod : Node_Id := Next (N);
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begin
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while Next (Nod) /= After loop
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Nod := Next (Nod);
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end loop;
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return Nod;
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end;
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end Make_Shared_Var_Procs;
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--------------------------
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-- On_Lhs_Of_Assignment --
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--------------------------
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function On_Lhs_Of_Assignment (N : Node_Id) return Boolean is
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P : constant Node_Id := Parent (N);
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begin
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if Nkind (P) = N_Assignment_Statement then
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if N = Name (P) then
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Insert_Node := P;
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return True;
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else
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return False;
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end if;
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elsif (Nkind (P) = N_Indexed_Component
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or else
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Nkind (P) = N_Selected_Component)
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and then N = Prefix (P)
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then
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return On_Lhs_Of_Assignment (P);
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else
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return False;
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end if;
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end On_Lhs_Of_Assignment;
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end Exp_Smem;
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