gcc/ada/exp_disp.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             E X P _ D I S P                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.9 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- GNAT was originally developed  by the GNAT team at  New York University. --
  25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  26 --                                                                          --
  27 ------------------------------------------------------------------------------
  28
  29 --  This package contains routines involved in tagged types and dynamic
  30 --  dispatching expansion
  31
  32 with Types; use Types;
  33 package Exp_Disp is
  34
  35    type DT_Access_Action is
  36       (CW_Membership,
  37        DT_Entry_Size,
  38        DT_Prologue_Size,
  39        Get_Expanded_Name,
  40        Get_External_Tag,
  41        Get_Prim_Op_Address,
  42        Get_RC_Offset,
  43        Get_Remotely_Callable,
  44        Get_TSD,
  45        Inherit_DT,
  46        Inherit_TSD,
  47        Register_Tag,
  48        Set_Expanded_Name,
  49        Set_External_Tag,
  50        Set_Prim_Op_Address,
  51        Set_RC_Offset,
  52        Set_Remotely_Callable,
  53        Set_TSD,
  54        TSD_Entry_Size,
  55        TSD_Prologue_Size);
  56
  57
  58    function Fill_DT_Entry
  59      (Loc  : Source_Ptr;
  60       Prim : Entity_Id)
  61       return Node_Id;
  62    --  Generate the code necessary to fill the appropriate entry of the
  63    --  dispatch table of Prim's controlling type with Prim's address.
  64
  65    function Make_DT_Access_Action
  66      (Typ    : Entity_Id;
  67       Action : DT_Access_Action;
  68       Args   : List_Id)
  69       return Node_Id;
  70    --  Generate a call to one of the Dispatch Table Access Subprograms defined
  71    --  in Ada.Tags or in Interfaces.Cpp
  72
  73    function Make_DT (Typ : Entity_Id) return List_Id;
  74    --  Expand the declarations for the Dispatch Table (or the Vtable in
  75    --  the case of type whose ancestor is a CPP_Class)
  76
  77    procedure Set_All_DT_Position (Typ : Entity_Id);
  78    --  Set the DT_Position field for each primitive operation. In the CPP
  79    --  Class case check that no pragma CPP_Virtual is missing  and that the
  80    --  DT_Position are coherent
  81
  82    procedure Expand_Dispatch_Call (Call_Node : Node_Id);
  83    --  Expand the call to the operation through the dispatch table and perform
  84    --  the required tag checks when appropriate. For CPP types the call is
  85    --  done through the Vtable (tag checks are not relevant)
  86
  87    procedure Set_Default_Constructor (Typ : Entity_Id);
  88    --  Typ is a CPP_Class type. Create the Init procedure of that type to
  89    --  be the default constructor (i.e. the function returning this type,
  90    --  having a pragma CPP_Constructor and no parameter)
  91
  92    function Get_Remotely_Callable (Obj : Node_Id) return Node_Id;
  93    --  Return an expression that holds True if the object can be transmitted
  94    --  onto another partition according to E.4 (18)
  95
  96 end Exp_Disp;