200 lines
8.7 KiB
Ada
200 lines
8.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- E X P _ A T A G --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2006-2011, 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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-- This package contains routines involved in the frontend expansion of
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-- subprograms of package Ada.Tags
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with Types; use Types;
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with Uintp; use Uintp;
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package Exp_Atag is
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-- Note: In all the subprograms of this package formal 'Loc' is the source
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-- location used in constructing the corresponding nodes.
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procedure Build_Common_Dispatching_Select_Statements
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(Typ : Entity_Id;
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Stmts : List_Id);
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-- Ada 2005 (AI-345): Build statements that are common to the expansion of
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-- timed, asynchronous, and conditional select and append them to Stmts.
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-- Typ is the tagged type used for dispatching calls.
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procedure Build_CW_Membership
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(Loc : Source_Ptr;
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Obj_Tag_Node : in out Node_Id;
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Typ_Tag_Node : Node_Id;
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Related_Nod : Node_Id;
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New_Node : out Node_Id);
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-- Build code that returns true if Obj_Tag is in Typ_Tag'Class. Each DT
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-- has a table of ancestors and its inheritance level (Idepth). Obj is in
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-- Typ'Class if Typ'Tag is found in the table of ancestors referenced by
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-- Obj'Tag. Knowing the level of inheritance of both types, this can be
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-- computed in constant time by the formula:
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--
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-- Index := TSD (Obj'Tag).Idepth - TSD (Typ'Tag).Idepth;
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-- Index > 0 and then TSD (Obj'Tag).Tags_Table (Index) = Typ'Tag
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--
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-- Related_Nod is the node where the implicit declaration of variable Index
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-- is inserted. Obj_Tag_Node is relocated.
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function Build_Get_Access_Level
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id;
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-- Build code that retrieves the accessibility level of the tagged type.
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--
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-- Generates: TSD (Tag).Access_Level
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function Build_Get_Alignment
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id;
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-- Build code that retrieves the alignment of the tagged type.
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-- Generates: TSD (Tag).Alignment
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procedure Build_Get_Predefined_Prim_Op_Address
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(Loc : Source_Ptr;
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Position : Uint;
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Tag_Node : in out Node_Id;
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New_Node : out Node_Id);
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-- Given a pointer to a dispatch table (T) and a position in the DT, build
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-- code that gets the address of the predefined virtual function stored in
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-- it (used for dispatching calls). Tag_Node is relocated.
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--
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-- Generates: Predefined_DT (Tag).D (Position);
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procedure Build_Get_Prim_Op_Address
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(Loc : Source_Ptr;
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Typ : Entity_Id;
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Position : Uint;
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Tag_Node : in out Node_Id;
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New_Node : out Node_Id);
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-- Build code that retrieves the address of the virtual function stored in
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-- a given position of the dispatch table (used for dispatching calls).
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-- Tag_Node is relocated.
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--
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-- Generates: To_Tag (Tag).D (Position);
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function Build_Get_Transportable
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(Loc : Source_Ptr;
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Tag_Node : Node_Id) return Node_Id;
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-- Build code that retrieves the value of the Transportable flag for
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-- the given Tag.
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--
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-- Generates: TSD (Tag).Transportable;
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function Build_Inherit_CPP_Prims (Typ : Entity_Id) return List_Id;
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-- Build code that copies from Typ's parent the dispatch table slots of
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-- inherited primitives and updates slots of overridden primitives. The
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-- generated code handles primary and secondary dispatch tables of Typ.
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function Build_Inherit_Predefined_Prims
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(Loc : Source_Ptr;
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Old_Tag_Node : Node_Id;
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New_Tag_Node : Node_Id) return Node_Id;
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-- Build code that inherits the predefined primitives of the parent.
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--
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-- Generates: Predefined_DT (New_T).D (All_Predefined_Prims) :=
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-- Predefined_DT (Old_T).D (All_Predefined_Prims);
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--
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-- Required to build non-library level dispatch tables. Also required
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-- when compiling without static dispatch tables support.
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function Build_Inherit_Prims
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(Loc : Source_Ptr;
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Typ : Entity_Id;
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Old_Tag_Node : Node_Id;
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New_Tag_Node : Node_Id;
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Num_Prims : Nat) return Node_Id;
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-- Build code that inherits Num_Prims user-defined primitives from the
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-- dispatch table of the parent type of tagged type Typ. It is used to
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-- copy the dispatch table of the parent in the following cases:
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-- a) case of derivations of CPP_Class types
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-- b) tagged types whose dispatch table is not statically allocated
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--
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-- Generates:
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-- New_Tag.Prims_Ptr (1 .. Num_Prims) :=
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-- Old_Tag.Prims_Ptr (1 .. Num_Prims);
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function Build_Offset_To_Top
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(Loc : Source_Ptr;
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This_Node : Node_Id) return Node_Id;
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-- Build code that references the Offset_To_Top component of the primary
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-- or secondary dispatch table associated with This_Node. This subprogram
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-- provides a subset of the functionality provided by the function
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-- Offset_To_Top of package Ada.Tags, and is only called by the frontend
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-- when such routine is not available in a configurable runtime.
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--
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-- Generates:
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-- Offset_To_Top_Ptr
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-- (Address!(Tag_Ptr!(This).all) - Offset_To_Top_Offset)
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function Build_Set_Predefined_Prim_Op_Address
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(Loc : Source_Ptr;
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Tag_Node : Node_Id;
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Position : Uint;
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Address_Node : Node_Id) return Node_Id;
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-- Build code that saves the address of a virtual function in a given
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-- Position of the portion of the dispatch table associated with the
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-- predefined primitives of Tag. Called from Exp_Disp.Fill_DT_Entry
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-- and Exp_Disp.Fill_Secondary_DT_Entry. It is used for:
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-- 1) Filling the dispatch table of CPP_Class types.
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-- 2) Late overriding (see Check_Dispatching_Operation).
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--
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-- Generates: Predefined_DT (Tag).D (Position) := Value
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function Build_Set_Prim_Op_Address
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(Loc : Source_Ptr;
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Typ : Entity_Id;
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Tag_Node : Node_Id;
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Position : Uint;
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Address_Node : Node_Id) return Node_Id;
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-- Build code that saves the address of a virtual function in a given
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-- Position of the dispatch table associated with the Tag. Called from
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-- Exp_Disp.Fill_DT_Entry and Exp_Disp.Fill_Secondary_DT_Entry. Used for:
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-- 1) Filling the dispatch table of CPP_Class types.
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-- 2) Late overriding (see Check_Dispatching_Operation).
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--
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-- Generates: Tag.D (Position) := Value
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function Build_Set_Size_Function
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(Loc : Source_Ptr;
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Tag_Node : Node_Id;
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Size_Func : Entity_Id) return Node_Id;
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-- Build code that saves in the TSD the address of the function
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-- calculating _size of the object.
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function Build_Set_Static_Offset_To_Top
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(Loc : Source_Ptr;
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Iface_Tag : Node_Id;
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Offset_Value : Node_Id) return Node_Id;
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-- Build code that initialize the Offset_To_Top component of the
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-- secondary dispatch table referenced by Iface_Tag.
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--
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-- Generates:
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-- Offset_To_Top_Ptr
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-- (Address!(Tag_Ptr!(This).all) - Offset_To_Top_Offset).all
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-- := Offset_Value
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end Exp_Atag;
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