New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45959 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 150 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                             S E M _ S M E M                              --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision: 1.5 $
+--                                                                          --
+--          Copyright (C) 1998-2000, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Atree;  use Atree;
+with Einfo;  use Einfo;
+with Errout; use Errout;
+with Namet;  use Namet;
+with Sinfo;  use Sinfo;
+with Snames; use Snames;
+
+package body Sem_Smem is
+
+   function Contains_Access_Type (T : Entity_Id) return Boolean;
+   --  This function determines if type T is an access type, or contains
+   --  a component (array, record, protected type cases) that contains
+   --  an access type (recursively defined in the appropriate manner).
+
+   ----------------------
+   -- Check_Shared_Var --
+   ----------------------
+
+   procedure Check_Shared_Var
+     (Id : Entity_Id;
+      T  : Entity_Id;
+      N  : Node_Id)
+   is
+   begin
+      --  We cannot tolerate aliased variables, because they might be
+      --  modified via an aliased pointer, and we could not detect that
+      --  this was happening (to update the corresponding shared memory
+      --  file), so we must disallow all use of Aliased
+
+      if Aliased_Present (N) then
+         Error_Msg_N
+           ("aliased variables " &
+            "not supported in Shared_Passive partitions",
+            N);
+
+      --  We can't support access types at all, since they are local
+      --  pointers that cannot in any simple way be transmitted to other
+      --  partitions.
+
+      elsif Is_Access_Type (T) then
+         Error_Msg_N
+           ("access type variables " &
+            "not supported in Shared_Passive partitions",
+            Id);
+
+      --  We cannot tolerate types that contain access types, same reasons
+
+      elsif Contains_Access_Type (T) then
+         Error_Msg_N
+           ("types containing access components " &
+            "not supported in Shared_Passive partitions",
+            Id);
+
+      --  Currently we do not support unconstrained record types, since we
+      --  use 'Write to write out values. This could probably be special
+      --  cased and handled in the future if necessary.
+
+      elsif Is_Record_Type (T)
+        and then not Is_Constrained (T)
+      then
+         Error_Msg_N
+           ("unconstrained variant records " &
+            "not supported in Shared_Passive partitions",
+            Id);
+      end if;
+   end Check_Shared_Var;
+
+   --------------------------
+   -- Contains_Access_Type --
+   --------------------------
+
+   function Contains_Access_Type (T : Entity_Id) return Boolean is
+      C : Entity_Id;
+
+   begin
+      if Is_Access_Type (T) then
+         return True;
+
+      elsif Is_Array_Type (T) then
+         return Contains_Access_Type (Component_Type (T));
+
+      elsif Is_Record_Type (T) then
+         if Has_Discriminants (T) then
+            C := First_Discriminant (T);
+            while Present (C) loop
+               if Comes_From_Source (C) then
+                  return True;
+               else
+                  C := Next_Discriminant (C);
+               end if;
+            end loop;
+         end if;
+
+         C := First_Component (T);
+         while Present (C) loop
+
+            --  For components, ignore internal components other than _Parent
+
+            if Comes_From_Source (T)
+              and then
+                (Chars (C) = Name_uParent
+                  or else
+                 not Is_Internal_Name (Chars (C)))
+              and then Contains_Access_Type (Etype (C))
+            then
+               return True;
+            else
+               C := Next_Component (C);
+            end if;
+         end loop;
+
+         return False;
+
+      elsif Is_Protected_Type (T) then
+         return Contains_Access_Type (Corresponding_Record_Type (T));
+
+      else
+         return False;
+      end if;
+   end Contains_Access_Type;
+
+end Sem_Smem;