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) 1992-2019, 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 => Abort_Undefer / 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 if front-end exception:
  50    --    when others =>
  51    --      Abort_Undefer;
  52    --  or if back-end exception:
  53    --    when others =>
  54    --      null;
  55    --  This is an exception handler to stop propagation of aborts, without
  56    --  modifying the deferal level.
  57
  58    function Build_B
  59      (Loc   : Source_Ptr;
  60       Decls : List_Id) return Entity_Id;
  61    --  Generate:
  62    --    B : Boolean := False;
  63    --  Append the object declaration to the list and return its defining
  64    --  identifier.
  65
  66    function Build_C
  67      (Loc   : Source_Ptr;
  68       Decls : List_Id) return Entity_Id;
  69    --  Generate:
  70    --    C : Ada.Tags.Prim_Op_Kind;
  71    --  Append the object declaration to the list and return its defining
  72    --  identifier.
  73
  74    function Build_Cleanup_Block
  75      (Loc       : Source_Ptr;
  76       Blk_Ent   : Entity_Id;
  77       Stmts     : List_Id;
  78       Clean_Ent : Entity_Id) return Node_Id;
  79    --  Generate:
  80    --    declare
  81    --       procedure _clean is
  82    --       begin
  83    --          ...
  84    --       end _clean;
  85    --    begin
  86    --       Stmts
  87    --    at end
  88    --       _clean;
  89    --    end;
  90    --  Blk_Ent is the name of the generated block, Stmts is the list of
  91    --  encapsulated statements and Clean_Ent is the parameter to the
  92    --  _clean procedure.
  93
  94    function Build_K
  95      (Loc   : Source_Ptr;
  96       Decls : List_Id;
  97       Obj   : Entity_Id) return Entity_Id;
  98    --  Generate
  99    --    K : Ada.Tags.Tagged_Kind :=
 100    --          Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (Obj));
 101    --  where Obj is the pointer to a secondary table. Append the object
 102    --  declaration to the list and return its defining identifier.
 103
 104    function Build_S
 105      (Loc  : Source_Ptr;
 106       Decls : List_Id) return Entity_Id;
 107    --  Generate:
 108    --    S : Integer;
 109    --  Append the object declaration to the list and return its defining
 110    --  identifier.
 111
 112    function Build_S_Assignment
 113      (Loc      : Source_Ptr;
 114       S        : Entity_Id;
 115       Obj      : Entity_Id;
 116       Call_Ent : Entity_Id) return Node_Id;
 117    --  Generate:
 118    --    S := Ada.Tags.Get_Offset_Index (
 119    --           Ada.Tags.Tag (Obj), DT_Position (Call_Ent));
 120    --  where Obj is the pointer to a secondary table, Call_Ent is the entity
 121    --  of the dispatching call name. Return the generated assignment.
 122
 123 end Exp_Sel;