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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . T A G S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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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 2, 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 COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public 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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with System;
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with System.Storage_Elements;
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with Unchecked_Conversion;
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package Ada.Tags is
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pragma Preelaborate_05;
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-- In accordance with Ada 2005 AI-362
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type Tag is private;
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No_Tag : constant Tag;
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function Expanded_Name (T : Tag) return String;
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function External_Tag (T : Tag) return String;
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function Internal_Tag (External : String) return Tag;
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function Descendant_Tag
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(External : String;
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Ancestor : Tag) return Tag;
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pragma Ada_05 (Descendant_Tag);
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function Is_Descendant_At_Same_Level
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(Descendant : Tag;
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Ancestor : Tag) return Boolean;
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pragma Ada_05 (Is_Descendant_At_Same_Level);
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function Parent_Tag (T : Tag) return Tag;
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pragma Ada_05 (Parent_Tag);
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Tag_Error : exception;
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private
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-- The following subprogram specifications are placed here instead of
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-- the package body to see them from the frontend through rtsfind.
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---------------------------------------------------------------
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-- Abstract Procedural Interface For The GNAT Dispatch Table --
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---------------------------------------------------------------
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-- GNAT's Dispatch Table format is customizable in order to match the
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-- format used in another language. GNAT supports programs that use two
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-- different dispatch table formats at the same time: the native format
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-- that supports Ada 95 tagged types and which is described in Ada.Tags,
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-- and a foreign format for types that are imported from some other
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-- language (typically C++) which is described in Interfaces.CPP. The
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-- runtime information kept for each tagged type is separated into two
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-- objects: the Dispatch Table and the Type Specific Data record. These
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-- two objects are allocated statically using the constants:
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-- DT Size = DT_Prologue_Size + Nb_Prim * DT_Entry_Size
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-- TSD Size = TSD_Prologue_Size + (1 + Idepth) * TSD_Entry_Size
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-- where Nb_prim is the number of primitive operations of the given
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-- type and Idepth its inheritance depth.
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-- In order to set or retrieve information from the Dispatch Table or
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-- the Type Specific Data record, GNAT generates calls to Set_XXX or
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-- Get_XXX routines, where XXX is the name of the field of interest.
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type Dispatch_Table;
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type Tag is access all Dispatch_Table;
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type Interface_Tag is access all Dispatch_Table;
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No_Tag : constant Tag := null;
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type Object_Specific_Data (Nb_Prim : Positive);
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type Object_Specific_Data_Ptr is access all Object_Specific_Data;
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-- Information associated with the secondary dispatch table of tagged-type
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-- objects implementing abstract interfaces.
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type Select_Specific_Data (Nb_Prim : Positive);
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type Select_Specific_Data_Ptr is access all Select_Specific_Data;
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-- A table used to store the primitive operation kind and entry index of
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-- primitive subprograms of a type that implements a limited interface.
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-- The Select Specific Data table resides in the Type Specific Data of a
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-- type. This construct is used in the handling of dispatching triggers
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-- in select statements.
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type Type_Specific_Data;
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type Type_Specific_Data_Ptr is access all Type_Specific_Data;
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-- Primitive operation kinds. These values differentiate the kinds of
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-- callable entities stored in the dispatch table. Certain kinds may
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-- not be used, but are added for completeness.
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type Prim_Op_Kind is
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(POK_Function,
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POK_Procedure,
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POK_Protected_Entry,
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POK_Protected_Function,
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POK_Protected_Procedure,
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POK_Task_Entry,
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POK_Task_Function,
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POK_Task_Procedure);
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Default_Prim_Op_Count : constant Positive := 15;
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-- Number of predefined primitive operations added by the Expander for a
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-- tagged type. It is utilized for indexing in the two auxiliary tables
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-- used for dispatching asynchronous, conditional and timed selects. In
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-- order to be space efficient, indexing is performed by subtracting this
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-- constant value from the provided position in the auxiliary tables (must
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-- match Exp_Disp.Default_Prim_Op_Count).
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package SSE renames System.Storage_Elements;
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function CW_Membership (Obj_Tag : Tag; Typ_Tag : Tag) return Boolean;
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-- Given the tag of an object and the tag associated to a type, return
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-- true if Obj is in Typ'Class.
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function IW_Membership (This : System.Address; T : Tag) return Boolean;
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-- Ada 2005 (AI-251): General routine that checks if a given object
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-- implements a tagged type. Its common usage is to check if Obj is in
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-- Iface'Class, but it is also used to check if a class-wide interface
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-- implements a given type (Iface_CW_Typ in T'Class). For example:
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--
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-- type I is interface;
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-- type T is tagged ...
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--
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-- function Test (O : in I'Class) is
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-- begin
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-- return O in T'Class.
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-- end Test;
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function Get_Access_Level (T : Tag) return Natural;
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-- Given the tag associated with a type, returns the accessibility level
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-- of the type.
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function Get_Entry_Index (T : Tag; Position : Positive) return Positive;
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-- Return a primitive operation's entry index (if entry) given a dispatch
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-- table T and a position of a primitive operation in T.
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function Get_External_Tag (T : Tag) return System.Address;
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-- Retrieve the address of a null terminated string containing
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-- the external name.
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function Get_Offset_Index
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(T : Interface_Tag;
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Position : Positive) return Positive;
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-- Given a pointer to a secondary dispatch table (T) and a position of an
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-- operation in the DT, retrieve the corresponding operation's position in
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-- the primary dispatch table from the Offset Specific Data table of T.
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function Get_Prim_Op_Address
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(T : Tag;
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Position : Positive) return System.Address;
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-- Given a pointer to a dispatch table (T) and a position in the DT
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-- this function returns the address of the virtual function stored
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-- in it (used for dispatching calls).
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function Get_Prim_Op_Kind
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(T : Tag;
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Position : Positive) return Prim_Op_Kind;
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-- Return a primitive operation's kind given a dispatch table T and a
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-- position of a primitive operation in T.
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function Get_RC_Offset (T : Tag) return SSE.Storage_Offset;
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-- Return the Offset of the implicit record controller when the object
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-- has controlled components. O otherwise.
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pragma Export (Ada, Get_RC_Offset, "ada__tags__get_rc_offset");
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-- This procedure is used in s-finimp to compute the deep routines
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-- it is exported manually in order to avoid changing completely the
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-- organization of the run time.
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function Get_Remotely_Callable (T : Tag) return Boolean;
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-- Return the value previously set by Set_Remotely_Callable
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procedure Inherit_DT (Old_T : Tag; New_T : Tag; Entry_Count : Natural);
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-- Entry point used to initialize the DT of a type knowing the tag
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-- of the direct ancestor and the number of primitive ops that are
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-- inherited (Entry_Count).
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procedure Inherit_TSD (Old_Tag : Tag; New_Tag : Tag);
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-- Initialize the TSD of a type knowing the tag of the direct ancestor
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function OSD (T : Interface_Tag) return Object_Specific_Data_Ptr;
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-- Ada 2005 (AI-251): Given a pointer T to a secondary dispatch table,
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-- retrieve the address of the record containing the Objet Specific
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-- Data table.
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function Parent_Size
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(Obj : System.Address;
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T : Tag) return SSE.Storage_Count;
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-- Computes the size the ancestor part of a tagged extension object whose
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-- address is 'obj' by calling indirectly the ancestor _size function. The
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-- ancestor is the parent of the type represented by tag T. This function
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-- assumes that _size is always in slot one of the dispatch table.
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pragma Export (Ada, Parent_Size, "ada__tags__parent_size");
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-- This procedure is used in s-finimp and is thus exported manually
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procedure Register_Interface_Tag (T : Tag; Interface_T : Tag);
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-- Ada 2005 (AI-251): Used to initialize the table of interfaces
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-- implemented by a type. Required to give support to IW_Membership.
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procedure Register_Tag (T : Tag);
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-- Insert the Tag and its associated external_tag in a table for the
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-- sake of Internal_Tag
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procedure Set_Entry_Index (T : Tag; Position : Positive; Value : Positive);
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-- Set the entry index of a primitive operation in T's TSD table indexed
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-- by Position.
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procedure Set_Num_Prim_Ops (T : Tag; Value : Natural);
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-- Set the number of primitive operations in the dispatch table of T. This
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-- is used for debugging purposes.
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procedure Set_Offset_Index
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(T : Interface_Tag;
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Position : Positive;
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Value : Positive);
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-- Set the offset value of a primitive operation in a secondary dispatch
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-- table denoted by T, indexed by Position.
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procedure Set_Offset_To_Top
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(T : Tag;
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Value : System.Storage_Elements.Storage_Offset);
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-- Ada 2005 (AI-251): Initialize the Offset_To_Top field in the prologue of
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-- the dispatch table. In primary dispatch tables the value of this field
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-- is always 0; in secondary dispatch tables this is the offset to the base
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-- of the enclosing type.
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procedure Set_OSD (T : Interface_Tag; Value : System.Address);
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-- Given a pointer T to a secondary dispatch table, store the pointer to
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-- the record containing the Object Specific Data generated by GNAT.
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procedure Set_Prim_Op_Address
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(T : Tag;
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Position : Positive;
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Value : System.Address);
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-- Given a pointer to a dispatch Table (T) and a position in the dispatch
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-- Table put the address of the virtual function in it (used for
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-- overriding).
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procedure Set_Prim_Op_Kind
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(T : Tag;
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Position : Positive;
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Value : Prim_Op_Kind);
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-- Set the kind of a primitive operation in T's TSD table indexed by
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-- Position.
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procedure Set_SSD (T : Tag; Value : System.Address);
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-- Given a pointer T to a dispatch Table, stores the pointer to the record
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-- containing the Select Specific Data generated by GNAT.
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procedure Set_TSD (T : Tag; Value : System.Address);
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-- Given a pointer T to a dispatch Table, stores the address of the record
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-- containing the Type Specific Data generated by GNAT.
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procedure Set_Access_Level (T : Tag; Value : Natural);
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-- Sets the accessibility level of the tagged type associated with T
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-- in its TSD.
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procedure Set_Expanded_Name (T : Tag; Value : System.Address);
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-- Set the address of the string containing the expanded name
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-- in the Dispatch table.
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procedure Set_External_Tag (T : Tag; Value : System.Address);
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-- Set the address of the string containing the external tag
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-- in the Dispatch table.
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procedure Set_RC_Offset (T : Tag; Value : SSE.Storage_Offset);
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-- Sets the Offset of the implicit record controller when the object
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-- has controlled components. Set to O otherwise.
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procedure Set_Remotely_Callable (T : Tag; Value : Boolean);
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-- Set to true if the type has been declared in a context described
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-- in E.4 (18).
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function SSD (T : Tag) return Select_Specific_Data_Ptr;
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-- Given a pointer T to a dispatch Table, retrieves the address of the
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-- record containing the Select Specific Data in T's TSD.
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function TSD (T : Tag) return Type_Specific_Data_Ptr;
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-- Given a pointer T to a dispatch Table, retrieves the address of the
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-- record containing the Type Specific Data generated by GNAT.
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DT_Prologue_Size : constant SSE.Storage_Count :=
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SSE.Storage_Count
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(3 * (Standard'Address_Size / System.Storage_Unit));
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-- Size of the first part of the dispatch table
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DT_Signature_Size : constant SSE.Storage_Count :=
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SSE.Storage_Count
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(Standard'Address_Size / System.Storage_Unit);
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-- Size of the Signature field of the dispatch table
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DT_Offset_To_Top_Size : constant SSE.Storage_Count :=
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SSE.Storage_Count
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(Standard'Address_Size / System.Storage_Unit);
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-- Size of the Offset_To_Top field of the Dispatch Table
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DT_Typeinfo_Ptr_Size : constant SSE.Storage_Count :=
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SSE.Storage_Count
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(Standard'Address_Size / System.Storage_Unit);
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-- Size of the Typeinfo_Ptr field of the Dispatch Table
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DT_Entry_Size : constant SSE.Storage_Count :=
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SSE.Storage_Count
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(1 * (Standard'Address_Size / System.Storage_Unit));
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-- Size of each primitive operation entry in the Dispatch Table
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TSD_Prologue_Size : constant SSE.Storage_Count :=
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343 |
|
|
SSE.Storage_Count
|
344 |
|
|
(10 * (Standard'Address_Size / System.Storage_Unit));
|
345 |
|
|
-- Size of the first part of the type specific data
|
346 |
|
|
|
347 |
|
|
TSD_Entry_Size : constant SSE.Storage_Count :=
|
348 |
|
|
SSE.Storage_Count (1 * (Standard'Address_Size / System.Storage_Unit));
|
349 |
|
|
-- Size of each ancestor tag entry in the TSD
|
350 |
|
|
|
351 |
|
|
type Address_Array is array (Natural range <>) of System.Address;
|
352 |
|
|
pragma Suppress (Index_Check, On => Address_Array);
|
353 |
|
|
-- The reason we suppress index checks is that in the body, objects
|
354 |
|
|
-- of this type are declared with a dummy size of 1, the actual size
|
355 |
|
|
-- depending on the number of primitive operations.
|
356 |
|
|
|
357 |
|
|
type Signature_Kind is
|
358 |
|
|
(Unknown,
|
359 |
|
|
Valid_Signature,
|
360 |
|
|
Primary_DT,
|
361 |
|
|
Secondary_DT,
|
362 |
|
|
Abstract_Interface);
|
363 |
|
|
for Signature_Kind'Size use 8;
|
364 |
|
|
-- Kind of signature found in the header of the dispatch table. These
|
365 |
|
|
-- signatures are generated by the frontend and are used by the Check_XXX
|
366 |
|
|
-- routines to ensure that the kind of dispatch table managed by each of
|
367 |
|
|
-- the routines in this package is correct. This additional check is only
|
368 |
|
|
-- performed with this run-time package is compiled with assertions enabled
|
369 |
|
|
|
370 |
|
|
-- The signature is a sequence of two bytes. The first byte must have the
|
371 |
|
|
-- value Valid_Signature, and the second byte must have a value in the
|
372 |
|
|
-- range Primary_DT .. Abstract_Interface. The Unknown value is used by
|
373 |
|
|
-- the Check_XXX routines to indicate that the signature is wrong.
|
374 |
|
|
|
375 |
|
|
-- Unchecked Conversions
|
376 |
|
|
|
377 |
|
|
type Addr_Ptr is access System.Address;
|
378 |
|
|
type Tag_Ptr is access Tag;
|
379 |
|
|
|
380 |
|
|
type Signature_Values is
|
381 |
|
|
array (1 .. DT_Signature_Size) of Signature_Kind;
|
382 |
|
|
-- Type used to see the signature as a sequence of Signature_Kind values
|
383 |
|
|
|
384 |
|
|
function To_Addr_Ptr is
|
385 |
|
|
new Unchecked_Conversion (System.Address, Addr_Ptr);
|
386 |
|
|
|
387 |
|
|
function To_Type_Specific_Data_Ptr is
|
388 |
|
|
new Unchecked_Conversion (System.Address, Type_Specific_Data_Ptr);
|
389 |
|
|
|
390 |
|
|
function To_Address is
|
391 |
|
|
new Unchecked_Conversion (Interface_Tag, System.Address);
|
392 |
|
|
|
393 |
|
|
function To_Address is
|
394 |
|
|
new Unchecked_Conversion (Tag, System.Address);
|
395 |
|
|
|
396 |
|
|
function To_Address is
|
397 |
|
|
new Unchecked_Conversion (Type_Specific_Data_Ptr, System.Address);
|
398 |
|
|
|
399 |
|
|
function To_Object_Specific_Data_Ptr is
|
400 |
|
|
new Unchecked_Conversion (System.Address, Object_Specific_Data_Ptr);
|
401 |
|
|
|
402 |
|
|
function To_Select_Specific_Data_Ptr is
|
403 |
|
|
new Unchecked_Conversion (System.Address, Select_Specific_Data_Ptr);
|
404 |
|
|
|
405 |
|
|
function To_Signature_Values is
|
406 |
|
|
new Unchecked_Conversion (System.Storage_Elements.Storage_Offset,
|
407 |
|
|
Signature_Values);
|
408 |
|
|
|
409 |
|
|
function To_Tag_Ptr is
|
410 |
|
|
new Unchecked_Conversion (System.Address, Tag_Ptr);
|
411 |
|
|
|
412 |
|
|
-- Primitive dispatching operations are always inlined, to facilitate
|
413 |
|
|
-- use in a minimal/no run-time environment for high integrity use.
|
414 |
|
|
|
415 |
|
|
pragma Inline_Always (CW_Membership);
|
416 |
|
|
pragma Inline_Always (IW_Membership);
|
417 |
|
|
pragma Inline_Always (Get_Access_Level);
|
418 |
|
|
pragma Inline_Always (Get_Entry_Index);
|
419 |
|
|
pragma Inline_Always (Get_Offset_Index);
|
420 |
|
|
pragma Inline_Always (Get_Prim_Op_Address);
|
421 |
|
|
pragma Inline_Always (Get_Prim_Op_Kind);
|
422 |
|
|
pragma Inline_Always (Get_RC_Offset);
|
423 |
|
|
pragma Inline_Always (Get_Remotely_Callable);
|
424 |
|
|
pragma Inline_Always (Inherit_DT);
|
425 |
|
|
pragma Inline_Always (Inherit_TSD);
|
426 |
|
|
pragma Inline_Always (OSD);
|
427 |
|
|
pragma Inline_Always (Register_Interface_Tag);
|
428 |
|
|
pragma Inline_Always (Register_Tag);
|
429 |
|
|
pragma Inline_Always (Set_Access_Level);
|
430 |
|
|
pragma Inline_Always (Set_Entry_Index);
|
431 |
|
|
pragma Inline_Always (Set_Expanded_Name);
|
432 |
|
|
pragma Inline_Always (Set_External_Tag);
|
433 |
|
|
pragma Inline_Always (Set_Num_Prim_Ops);
|
434 |
|
|
pragma Inline_Always (Set_Offset_Index);
|
435 |
|
|
pragma Inline_Always (Set_Offset_To_Top);
|
436 |
|
|
pragma Inline_Always (Set_Prim_Op_Address);
|
437 |
|
|
pragma Inline_Always (Set_Prim_Op_Kind);
|
438 |
|
|
pragma Inline_Always (Set_RC_Offset);
|
439 |
|
|
pragma Inline_Always (Set_Remotely_Callable);
|
440 |
|
|
pragma Inline_Always (Set_OSD);
|
441 |
|
|
pragma Inline_Always (Set_SSD);
|
442 |
|
|
pragma Inline_Always (Set_TSD);
|
443 |
|
|
pragma Inline_Always (SSD);
|
444 |
|
|
pragma Inline_Always (TSD);
|
445 |
|
|
|
446 |
|
|
end Ada.Tags;
|