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|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ S E L --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2011, 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 3, 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 COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- Routines used in Chapter 9 for the expansion of dispatching triggers in
-- select statements (Ada 2005: AI-345)
with Types; use Types;
package Exp_Sel is
function Build_Abort_Block
(Loc : Source_Ptr;
Abr_Blk_Ent : Entity_Id;
Cln_Blk_Ent : Entity_Id;
Blk : Node_Id) return Node_Id;
-- Generate:
-- begin
-- Blk
-- exception
-- when Abort_Signal => Abort_Undefer / null;
-- end;
-- Abr_Blk_Ent is the name of the generated block, Cln_Blk_Ent is the name
-- of the encapsulated cleanup block, Blk is the actual block name.
-- The exception handler code is built by Build_Abort_Block_Handler.
function Build_Abort_Block_Handler (Loc : Source_Ptr) return Node_Id;
-- Generate if front-end exception:
-- when others =>
-- Abort_Under;
-- or if back-end exception:
-- when others =>
-- null;
-- This is an exception handler to stop propagation of aborts, without
-- modifying the deferal level.
function Build_B
(Loc : Source_Ptr;
Decls : List_Id) return Entity_Id;
-- Generate:
-- B : Boolean := False;
-- Append the object declaration to the list and return its defining
-- identifier.
function Build_C
(Loc : Source_Ptr;
Decls : List_Id) return Entity_Id;
-- Generate:
-- C : Ada.Tags.Prim_Op_Kind;
-- Append the object declaration to the list and return its defining
-- identifier.
function Build_Cleanup_Block
(Loc : Source_Ptr;
Blk_Ent : Entity_Id;
Stmts : List_Id;
Clean_Ent : Entity_Id) return Node_Id;
-- Generate:
-- declare
-- procedure _clean is
-- begin
-- ...
-- end _clean;
-- begin
-- Stmts
-- at end
-- _clean;
-- end;
-- Blk_Ent is the name of the generated block, Stmts is the list of
-- encapsulated statements and Clean_Ent is the parameter to the
-- _clean procedure.
function Build_K
(Loc : Source_Ptr;
Decls : List_Id;
Obj : Entity_Id) return Entity_Id;
-- Generate
-- K : Ada.Tags.Tagged_Kind :=
-- Ada.Tags.Get_Tagged_Kind (Ada.Tags.Tag (Obj));
-- where Obj is the pointer to a secondary table. Append the object
-- declaration to the list and return its defining identifier.
function Build_S
(Loc : Source_Ptr;
Decls : List_Id) return Entity_Id;
-- Generate:
-- S : Integer;
-- Append the object declaration to the list and return its defining
-- identifier.
function Build_S_Assignment
(Loc : Source_Ptr;
S : Entity_Id;
Obj : Entity_Id;
Call_Ent : Entity_Id) return Node_Id;
-- Generate:
-- S := Ada.Tags.Get_Offset_Index (
-- Ada.Tags.Tag (Obj), DT_Position (Call_Ent));
-- where Obj is the pointer to a secondary table, Call_Ent is the entity
-- of the dispatching call name. Return the generated assignment.
end Exp_Sel;
|
