155 lines
8.6 KiB
Ada
155 lines
8.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ C H 3 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Expand routines for chapter 3 constructs
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with Types; use Types;
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with Elists; use Elists;
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with Uintp; use Uintp;
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package Exp_Ch3 is
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procedure Expand_N_Object_Declaration (N : Node_Id);
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procedure Expand_N_Subtype_Indication (N : Node_Id);
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procedure Expand_N_Variant_Part (N : Node_Id);
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procedure Expand_N_Full_Type_Declaration (N : Node_Id);
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procedure Expand_Previous_Access_Type (Def_Id : Entity_Id);
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-- For a full type declaration that contains tasks, or that is a task,
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-- check whether there exists an access type whose designated type is an
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-- incomplete declarations for the current composite type. If so, build the
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-- master for that access type, now that it is known to denote an object
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-- with tasks.
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procedure Expand_Record_Extension (T : Entity_Id; Def : Node_Id);
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-- Add a field _parent in the extension part of the record
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procedure Build_Class_Wide_Master (T : Entity_Id);
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-- For access to class-wide limited types we must build a task master
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-- because some subsequent extension may add a task component. To avoid
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-- bringing in the tasking run-time whenever an access-to-class-wide
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-- limited type is used, we use the soft-link mechanism and add a level of
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-- indirection to calls to routines that manipulate Master_Ids. This must
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-- also be used for anonymous access types whose designated type is a task
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-- or synchronized interface.
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procedure Build_Discr_Checking_Funcs (N : Node_Id);
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-- Builds function which checks whether the component name is consistent
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-- with the current discriminants. N is the full type declaration node,
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-- and the discriminant checking functions are inserted after this node.
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function Build_Initialization_Call
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(Loc : Source_Ptr;
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Id_Ref : Node_Id;
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Typ : Entity_Id;
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In_Init_Proc : Boolean := False;
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Enclos_Type : Entity_Id := Empty;
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Discr_Map : Elist_Id := New_Elmt_List;
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With_Default_Init : Boolean := False;
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Constructor_Ref : Node_Id := Empty) return List_Id;
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-- Builds a call to the initialization procedure for the base type of Typ,
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-- passing it the object denoted by Id_Ref, plus additional parameters as
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-- appropriate for the type (the _Master, for task types, for example).
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-- Loc is the source location for the constructed tree. In_Init_Proc has
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-- to be set to True when the call is itself in an init proc in order to
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-- enable the use of discriminals. Enclos_Type is the enclosing type when
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-- initializing a component in an outer init proc, and it is used for
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-- various expansion cases including the case where Typ is a task type
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-- which is an array component, the indices of the enclosing type are
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-- used to build the string that identifies each task at runtime.
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--
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-- Discr_Map is used to replace discriminants by their discriminals in
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-- expressions used to constrain record components. In the presence of
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-- entry families bounded by discriminants, protected type discriminants
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-- can appear within expressions in array bounds (not as stand-alone
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-- identifiers) and a general replacement is necessary.
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--
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-- Ada 2005 (AI-287): With_Default_Init is used to indicate that the
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-- initialization call corresponds to a default initialized component
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-- of an aggregate.
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--
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-- Constructor_Ref is a call to a constructor subprogram. It is currently
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-- used only to support C++ constructors.
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procedure Build_Master_Renaming (N : Node_Id; T : Entity_Id);
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-- If the designated type of an access type is a task type or contains
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-- tasks, we make sure that a _Master variable is declared in the current
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-- scope, and then declare a renaming for it:
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--
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-- atypeM : Master_Id renames _Master;
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--
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-- where atyp is the name of the access type. This declaration is
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-- used when an allocator for the access type is expanded. The node N
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-- is the full declaration of the designated type that contains tasks.
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-- The renaming declaration is inserted before N, and after the Master
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-- declaration.
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function Freeze_Type (N : Node_Id) return Boolean;
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-- This function executes the freezing actions associated with the given
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-- freeze type node N and returns True if the node is to be deleted. We
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-- delete the node if it is present just for front end purpose and we don't
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-- want Gigi to see the node. This function can't delete the node itself
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-- since it would confuse any remaining processing of the freeze node.
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procedure Init_Secondary_Tags
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(Typ : Entity_Id;
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Target : Node_Id;
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Stmts_List : List_Id;
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Fixed_Comps : Boolean := True;
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Variable_Comps : Boolean := True);
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-- Ada 2005 (AI-251): Initialize the tags of the secondary dispatch tables
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-- of Typ. The generated code referencing tag fields of Target is appended
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-- to Stmts_List. If Fixed_Comps is True then the tag components located at
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-- fixed positions of Target are initialized; if Variable_Comps is True
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-- then tags components located at variable positions of Target are
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-- initialized.
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function Needs_Simple_Initialization (T : Entity_Id) return Boolean;
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-- Certain types need initialization even though there is no specific
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-- initialization routine. In this category are access types (which need
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-- initializing to null), packed array types whose implementation is a
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-- modular type, and all scalar types if Normalize_Scalars is set, as well
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-- as private types whose underlying type is present and meets any of these
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-- criteria. Finally, descendants of String and Wide_String also need
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-- initialization in Initialize/Normalize_Scalars mode.
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function Get_Simple_Init_Val
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(T : Entity_Id;
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N : Node_Id;
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Size : Uint := No_Uint) return Node_Id;
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-- For a type which Needs_Simple_Initialization (see above), prepares the
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-- tree for an expression representing the required initial value. N is a
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-- node whose source location used in constructing this tree which is
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-- returned as the result of the call. The Size parameter indicates the
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-- target size of the object if it is known (indicated by a value that is
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-- not No_Uint and is greater than zero). If Size is not given (Size set to
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-- No_Uint, or non-positive), then the Esize of T is used as an estimate of
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-- the Size. The object size is needed to prepare a known invalid value for
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-- use by Normalize_Scalars. A call to this routine where T is a scalar
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-- type is only valid if we are in Normalize_Scalars or Initialize_Scalars
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-- mode, or if N is the node for a 'Invalid_Value attribute node.
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end Exp_Ch3;
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