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 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 --  This package contains routines involved in tagged types and dynamic
  29 --  dispatching expansion
  30
  31 with Types; use Types;
  32 package Exp_Disp is
  33
  34    type DT_Access_Action is
  35       (CW_Membership,
  36        DT_Entry_Size,
  37        DT_Prologue_Size,
  38        Get_Expanded_Name,
  39        Get_External_Tag,
  40        Get_Prim_Op_Address,
  41        Get_RC_Offset,
  42        Get_Remotely_Callable,
  43        Get_TSD,
  44        Inherit_DT,
  45        Inherit_TSD,
  46        Register_Tag,
  47        Set_Expanded_Name,
  48        Set_External_Tag,
  49        Set_Prim_Op_Address,
  50        Set_RC_Offset,
  51        Set_Remotely_Callable,
  52        Set_TSD,
  53        TSD_Entry_Size,
  54        TSD_Prologue_Size);
  55
  56    function Fill_DT_Entry
  57      (Loc  : Source_Ptr;
  58       Prim : Entity_Id)
  59       return Node_Id;
  60    --  Generate the code necessary to fill the appropriate entry of the
  61    --  dispatch table of Prim's controlling type with Prim's address.
  62
  63    function Make_DT_Access_Action
  64      (Typ    : Entity_Id;
  65       Action : DT_Access_Action;
  66       Args   : List_Id)
  67       return Node_Id;
  68    --  Generate a call to one of the Dispatch Table Access Subprograms defined
  69    --  in Ada.Tags or in Interfaces.Cpp
  70
  71    function Make_DT (Typ : Entity_Id) return List_Id;
  72    --  Expand the declarations for the Dispatch Table (or the Vtable in
  73    --  the case of type whose ancestor is a CPP_Class)
  74
  75    procedure Set_All_DT_Position (Typ : Entity_Id);
  76    --  Set the DT_Position field for each primitive operation. In the CPP
  77    --  Class case check that no pragma CPP_Virtual is missing  and that the
  78    --  DT_Position are coherent
  79
  80    procedure Expand_Dispatch_Call (Call_Node : Node_Id);
  81    --  Expand the call to the operation through the dispatch table and perform
  82    --  the required tag checks when appropriate. For CPP types the call is
  83    --  done through the Vtable (tag checks are not relevant)
  84
  85    procedure Set_Default_Constructor (Typ : Entity_Id);
  86    --  Typ is a CPP_Class type. Create the Init procedure of that type to
  87    --  be the default constructor (i.e. the function returning this type,
  88    --  having a pragma CPP_Constructor and no parameter)
  89
  90    function Get_Remotely_Callable (Obj : Node_Id) return Node_Id;
  91    --  Return an expression that holds True if the object can be transmitted
  92    --  onto another partition according to E.4 (18)
  93
  94 end Exp_Disp;