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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              E X P _ C H 3                               --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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.      --

--                                                                          --

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--  Expand routines for chapter 3 constructs

with Types;  use Types;

with Elists; use Elists;

with Uintp;  use Uintp;

package Exp_Ch3 is

   procedure Expand_N_Object_Declaration         (N : Node_Id);

   procedure Expand_N_Subtype_Indication         (N : Node_Id);

   procedure Expand_N_Variant_Part               (N : Node_Id);

   procedure Expand_N_Full_Type_Declaration      (N : Node_Id);

   procedure Expand_Previous_Access_Type (Def_Id : Entity_Id);

   --  For a full type declaration that contains tasks, or that is a task,

   --  check whether there exists an access type whose designated type is an

   --  incomplete declarations for the current composite type. If so, build the

   --  master for that access type, now that it is known to denote an object

   --  with tasks.

   procedure Expand_Record_Extension (T : Entity_Id; Def : Node_Id);

   --  Add a field _parent in the extension part of the record

   procedure Build_Class_Wide_Master (T : Entity_Id);

   --  For access to class-wide limited types we must build a task master

   --  because some subsequent extension may add a task component. To avoid

   --  bringing in the tasking run-time whenever an access-to-class-wide

   --  limited type is used, we use the soft-link mechanism and add a level of

   --  indirection to calls to routines that manipulate Master_Ids. This must

   --  also be used for anonymous access types whose designated type is a task

   --  or synchronized interface.

   procedure Build_Discr_Checking_Funcs (N : Node_Id);

   --  Builds function which checks whether the component name is consistent

   --  with the current discriminants. N is the full type declaration node,

   --  and the discriminant checking functions are inserted after this node.

   function Build_Initialization_Call

     (Loc               : Source_Ptr;

      Id_Ref            : Node_Id;

      Typ               : Entity_Id;

      In_Init_Proc      : Boolean := False;

      Enclos_Type       : Entity_Id := Empty;

      Discr_Map         : Elist_Id := New_Elmt_List;

      With_Default_Init : Boolean := False;

      Constructor_Ref   : Node_Id := Empty) return List_Id;

   --  Builds a call to the initialization procedure for the base type of Typ,

   --  passing it the object denoted by Id_Ref, plus additional parameters as

   --  appropriate for the type (the _Master, for task types, for example).

   --  Loc is the source location for the constructed tree. In_Init_Proc has

   --  to be set to True when the call is itself in an init proc in order to

   --  enable the use of discriminals. Enclos_Type is the enclosing type when

   --  initializing a component in an outer init proc, and it is used for

   --  various expansion cases including the case where Typ is a task type

   --  which is an array component, the indices of the enclosing type are

   --  used to build the string that identifies each task at runtime.

   --

   --  Discr_Map is used to replace discriminants by their discriminals in

   --  expressions used to constrain record components. In the presence of

   --  entry families bounded by discriminants, protected type discriminants

   --  can appear within expressions in array bounds (not as stand-alone

   --  identifiers) and a general replacement is necessary.

   --

   --  Ada 2005 (AI-287): With_Default_Init is used to indicate that the

   --  initialization call corresponds to a default initialized component

   --  of an aggregate.

   --

   --  Constructor_Ref is a call to a constructor subprogram. It is currently

   --  used only to support C++ constructors.

   procedure Build_Master_Renaming (N : Node_Id; T : Entity_Id);

   --  If the designated type of an access type is a task type or contains

   --  tasks, we make sure that a _Master variable is declared in the current

   --  scope, and then declare a renaming for it:

   --

   --    atypeM : Master_Id renames _Master;

   --

   --  where atyp is the name of the access type. This declaration is

   --  used when an allocator for the access type is expanded. The node N

   --  is the full declaration of the designated type that contains tasks.

   --  The renaming declaration is inserted before N, and after the Master

   --  declaration.

   function Freeze_Type (N : Node_Id) return Boolean;

   --  This function executes the freezing actions associated with the given

   --  freeze type node N and returns True if the node is to be deleted. We

   --  delete the node if it is present just for front end purpose and we don't

   --  want Gigi to see the node. This function can't delete the node itself

   --  since it would confuse any remaining processing of the freeze node.

   procedure Init_Secondary_Tags

     (Typ            : Entity_Id;

      Target         : Node_Id;

      Stmts_List     : List_Id;

      Fixed_Comps    : Boolean := True;

      Variable_Comps : Boolean := True);

   --  Ada 2005 (AI-251): Initialize the tags of the secondary dispatch tables

   --  of Typ. The generated code referencing tag fields of Target is appended

   --  to Stmts_List. If Fixed_Comps is True then the tag components located at

   --  fixed positions of Target are initialized; if Variable_Comps is True

   --  then tags components located at variable positions of Target are

   --  initialized.

   function Needs_Simple_Initialization (T : Entity_Id) return Boolean;

   --  Certain types need initialization even though there is no specific

   --  initialization routine. In this category are access types (which need

   --  initializing to null), packed array types whose implementation is a

   --  modular type, and all scalar types if Normalize_Scalars is set, as well

   --  as private types whose underlying type is present and meets any of these

   --  criteria. Finally, descendants of String and Wide_String also need

   --  initialization in Initialize/Normalize_Scalars mode.

   function Get_Simple_Init_Val

     (T    : Entity_Id;

      N    : Node_Id;

      Size : Uint := No_Uint) return Node_Id;

   --  For a type which Needs_Simple_Initialization (see above), prepares the

   --  tree for an expression representing the required initial value. N is a

   --  node whose source location used in constructing this tree which is

   --  returned as the result of the call. The Size parameter indicates the

   --  target size of the object if it is known (indicated by a value that is

   --  not No_Uint and is greater than zero). If Size is not given (Size set to

   --  No_Uint, or non-positive), then the Esize of T is used as an estimate of

   --  the Size. The object size is needed to prepare a known invalid value for

   --  use by Normalize_Scalars. A call to this routine where T is a scalar

   --  type is only valid if we are in Normalize_Scalars or Initialize_Scalars

   --  mode, or if N is the node for a 'Invalid_Value attribute node.

end Exp_Ch3;