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131 | ------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . T A G S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2023, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the HI-E version of this file. Some functionality has been
-- removed in order to simplify this run-time unit.
with System.Storage_Elements; use System.Storage_Elements;
package body Ada.Tags is
-----------------------
-- Local Subprograms --
-----------------------
function Length (Str : Cstring_Ptr) return Natural;
-- Length of string represented by the given pointer (treating the string
-- as a C-style string, which is Nul terminated).
-------------------
-- Expanded_Name --
-------------------
function Expanded_Name (T : Tag) return String is
Result : Cstring_Ptr;
TSD_Ptr : Addr_Ptr;
TSD : Type_Specific_Data_Ptr;
begin
if T = No_Tag then
raise Tag_Error;
end if;
TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
Result := TSD.Expanded_Name;
return Result (1 .. Length (Result));
end Expanded_Name;
------------------
-- External_Tag --
------------------
function External_Tag (T : Tag) return String is
Result : Cstring_Ptr;
TSD_Ptr : Addr_Ptr;
TSD : Type_Specific_Data_Ptr;
begin
if T = No_Tag then
raise Tag_Error;
end if;
TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
Result := TSD.External_Tag;
return Result (1 .. Length (Result));
end External_Tag;
------------
-- Length --
------------
function Length (Str : Cstring_Ptr) return Natural is
Len : Integer;
begin
Len := 1;
while Str (Len) /= ASCII.NUL loop
Len := Len + 1;
end loop;
return Len - 1;
end Length;
----------------
-- Parent_Tag --
----------------
function Parent_Tag (T : Tag) return Tag is
TSD_Ptr : Addr_Ptr;
TSD : Type_Specific_Data_Ptr;
begin
if T = No_Tag then
raise Tag_Error;
end if;
TSD_Ptr := To_Addr_Ptr (To_Address (T) - DT_Typeinfo_Ptr_Size);
TSD := To_Type_Specific_Data_Ptr (TSD_Ptr.all);
-- The Parent_Tag of a root-level tagged type is defined to be No_Tag.
-- The first entry in the Ancestors_Tags array will be null for such
-- a type, but it's better to be explicit about returning No_Tag in
-- this case.
if TSD.Idepth = 0 then
return No_Tag;
else
return TSD.Tags_Table (1);
end if;
end Parent_Tag;
end Ada.Tags;
|