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Diffstat (limited to 'gcc-4.4.0/gcc/ada/s-finroo.ads')
| -rw-r--r-- | gcc-4.4.0/gcc/ada/s-finroo.ads | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/gcc-4.4.0/gcc/ada/s-finroo.ads b/gcc-4.4.0/gcc/ada/s-finroo.ads new file mode 100644 index 000000000..da373f7c3 --- /dev/null +++ b/gcc-4.4.0/gcc/ada/s-finroo.ads @@ -0,0 +1,85 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . F I N A L I Z A T I O N _ R O O T -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2009, 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 unit provides the basic support for controlled (finalizable) types + +with Ada.Streams; +with Ada.Unchecked_Conversion; + +package System.Finalization_Root is + pragma Preelaborate; + + type Root_Controlled is tagged; + + type Finalizable_Ptr is access all Root_Controlled'Class; + + function To_Finalizable_Ptr is + new Ada.Unchecked_Conversion (Address, Finalizable_Ptr); + + function To_Addr is + new Ada.Unchecked_Conversion (Finalizable_Ptr, Address); + + type Empty_Root_Controlled is abstract tagged null record; + -- Just for the sake of Controlled equality (see Ada.Finalization) + + type Root_Controlled is new Empty_Root_Controlled with record + Prev, Next : Finalizable_Ptr; + end record; + subtype Finalizable is Root_Controlled'Class; + + procedure Initialize (Object : in out Root_Controlled); + procedure Finalize (Object : in out Root_Controlled); + procedure Adjust (Object : in out Root_Controlled); + + -- Stream-oriented attributes for Root_Controlled. These must be empty so + -- as to not copy the finalization chain pointers. They are declared in + -- a nested package so that they do not create primitive operations of + -- Root_Controlled. Otherwise this would add unwanted primitives to (the + -- full view of) Ada.Finalization.Limited_Controlled, which would cause + -- trouble in cases where a limited controlled type is used as the + -- designated type of a remote access-to-classwide type. + + package Stream_Attributes is + + procedure Write + (Stream : not null access Ada.Streams.Root_Stream_Type'Class; + Item : Root_Controlled) is null; + + procedure Read + (Stream : not null access Ada.Streams.Root_Stream_Type'Class; + Item : out Root_Controlled) is null; + + end Stream_Attributes; + + for Root_Controlled'Read use Stream_Attributes.Read; + for Root_Controlled'Write use Stream_Attributes.Write; + +end System.Finalization_Root; |