167 lines
8.9 KiB
Ada
167 lines
8.9 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) 1992-2020, 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_Access_Subprogram_Wrapper_Body
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(Decl : Node_Id;
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New_Decl : Node_Id);
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-- Build the wrapper body, which holds the indirect call through an access-
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-- to-subprogram, and whose expansion incorporates the contracts of the
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-- access type declaration. Called from Build_Access_Subprogram_Wrapper.
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-- Building the wrapper is done during analysis to perform proper semantic
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-- checks on the relevant aspects. The wrapper body could be simplified to
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-- a null body when expansion is disabled ???
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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 indexes 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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function Build_Variant_Record_Equality
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(Typ : Entity_Id;
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Body_Id : Entity_Id;
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Param_Specs : List_Id) return Node_Id;
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-- Build the body of the equality function Body_Id for the untagged variant
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-- record Typ with the given parameters specification list.
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procedure Ensure_Activation_Chain_And_Master (Obj_Decl : Node_Id);
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-- If tasks are being declared (or might be declared) by the given object
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-- declaration then ensure to have an activation chain defined for the
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-- tasks (has no effect if we already have one), and also that a Master
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-- variable is established (and that the appropriate enclosing construct
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-- is established as a task master).
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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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function Get_Simple_Init_Val
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(Typ : Entity_Id;
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N : Node_Id;
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Size : Uint := No_Uint) return Node_Id;
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-- Build an expression that represents the required initial value of type
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-- Typ for which predicate Needs_Simple_Initialization is True. N is a node
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-- whose source location is used in the construction of the expression.
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-- Size is used as follows:
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--
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-- * If the size of the object to be initialized it is known, it should
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-- be passed to the routine.
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--
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-- * If the size is unknown or is zero, then the Esize of Typ is used as
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-- an estimate of the size.
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--
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-- The object size is needed to prepare a known invalid value for use by
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-- Normalize_Scalars. A call to this routine where Typ denotes a scalar
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-- type is valid only when Normalize_Scalars or Initialize_Scalars is
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-- active, or if N is the node for a 'Invalid_Value attribute node.
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function Init_Proc_Level_Formal (Proc : Entity_Id) return Entity_Id;
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-- Fetch the extra formal from an initalization procedure "proc"
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-- corresponding to the level of the object being initialized. When none
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-- is present Empty is returned.
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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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Init_Tags_List : List_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 Init_Tags_List and the code required to complete the elaboration of
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-- the dispatch tables of Typ is appended to Stmts_List. If Fixed_Comps is
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-- True then the tag components located at fixed positions of Target are
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-- initialized; if Variable_Comps is True then tags components located at
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-- variable positions of Target are initialized.
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function Make_Tag_Assignment (N : Node_Id) return Node_Id;
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-- An object declaration that has an initialization for a tagged object
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-- requires a separate reassignment of the tag of the given type, because
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-- the expression may include an unchecked conversion. This tag assignment
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-- is inserted after the declaration, but if the object has an address
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-- clause the assignment is handled as part of the freezing of the object,
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-- see Check_Address_Clause.
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end Exp_Ch3;
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