gcc/ada/exp_sel.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              E X P _ S E L                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2023, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  Routines used in Chapter 9 for the expansion of dispatching triggers in
  27 --  select statements (Ada 2005: AI-345)
  28
  29 with Types; use Types;
  30
  31 package Exp_Sel is
  32
  33    function Build_Abort_Block
  34      (Loc         : Source_Ptr;
  35       Abr_Blk_Ent : Entity_Id;
  36       Cln_Blk_Ent : Entity_Id;
  37       Blk         : Node_Id) return Node_Id;
  38    --  Generate:
  39    --    begin
  40    --       Blk
  41    --    exception
  42    --       when Abort_Signal => null;
  43    --    end;
  44    --  Abr_Blk_Ent is the name of the generated block, Cln_Blk_Ent is the name
  45    --  of the encapsulated cleanup block, Blk is the actual block name.
  46    --  The exception handler code is built by Build_Abort_Block_Handler.
  47
  48    function Build_Abort_Block_Handler (Loc : Source_Ptr) return Node_Id;
  49    --  Generate:
  50    --    when others =>
  51    --      null;
  52    --  This is an exception handler to stop propagation of aborts, without
  53    --  modifying the deferral level.
  54
  55    function Build_B
  56      (Loc   : Source_Ptr;
  57       Decls : List_Id) return Entity_Id;
  58    --  Generate:
  59    --    B : Boolean := False;
  60    --  Append the object declaration to the list and return its defining
  61    --  identifier.
  62
  63    function Build_C
  64      (Loc   : Source_Ptr;
  65       Decls : List_Id) return Entity_Id;
  66    --  Generate:
  67    --    C : Ada.Tags.Prim_Op_Kind;
  68    --  Append the object declaration to the list and return its defining
  69    --  identifier.
  70
  71    function Build_Cleanup_Block
  72      (Loc       : Source_Ptr;
  73       Blk_Ent   : Entity_Id;
  74       Stmts     : List_Id;
  75       Clean_Ent : Entity_Id) return Node_Id;
  76    --  Generate:
  77    --    declare
  78    --       procedure _clean is
  79    --       begin
  80    --          ...
  81    --       end _clean;
  82    --    begin
  83    --       Stmts
  84    --    at end
  85    --       _clean;
  86    --    end;
  87    --  Blk_Ent is the name of the generated block, Stmts is the list of
  88    --  encapsulated statements and Clean_Ent is the parameter to the
  89    --  _clean procedure.
  90
  91    function Build_K
  92      (Loc   : Source_Ptr;
  93       Decls : List_Id;
  94       Obj   : Entity_Id) return Entity_Id;
  95    --  Generate
  96    --    K : Ada.Tags.Tagged_Kind :=
  97    --          Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (Obj));
  98    --  where Obj is the pointer to a secondary table. Append the object
  99    --  declaration to the list and return its defining identifier.
 100
 101    function Build_S
 102      (Loc  : Source_Ptr;
 103       Decls : List_Id) return Entity_Id;
 104    --  Generate:
 105    --    S : Integer;
 106    --  Append the object declaration to the list and return its defining
 107    --  identifier.
 108
 109    function Build_S_Assignment
 110      (Loc      : Source_Ptr;
 111       S        : Entity_Id;
 112       Obj      : Entity_Id;
 113       Call_Ent : Entity_Id) return Node_Id;
 114    --  Generate:
 115    --    S := Ada.Tags.Get_Offset_Index (
 116    --           Ada.Tags.Tag (Obj), DT_Position (Call_Ent));
 117    --  where Obj is the pointer to a secondary table, Call_Ent is the entity
 118    --  of the dispatching call name. Return the generated assignment.
 119
 120 end Exp_Sel;