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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . F I N A L I Z A T I O N _ M A S T E R S -- -- -- -- S p e c -- -- -- -- Copyright (C) 2011, 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. -- -- -- ------------------------------------------------------------------------------ with Ada.Finalization; with System.Storage_Elements; with System.Storage_Pools; pragma Compiler_Unit; package System.Finalization_Masters is pragma Preelaborate; -- A reference to primitive Finalize_Address. The expander generates an -- implementation of this procedure for each controlled and class-wide -- type. Since controlled objects are simply viewed as addresses once -- allocated through a master, Finalize_Address provides a backward -- indirection from an address to a type-specific context. type Finalize_Address_Ptr is access procedure (Obj : System.Address); -- Heterogeneous collection type structure type FM_Node is private; type FM_Node_Ptr is access all FM_Node; pragma No_Strict_Aliasing (FM_Node_Ptr); -- A reference to any derivation from Root_Storage_Pool. Since this type -- may not be used to allocate objects, its storage size is zero. type Any_Storage_Pool_Ptr is access System.Storage_Pools.Root_Storage_Pool'Class; for Any_Storage_Pool_Ptr'Storage_Size use 0; -- Finalization master type structure. A unique master is associated with -- each access-to-controlled or access-to-class-wide type. Masters also act -- as components of subpools. By default, a master contains objects of the -- same designated type but it may also accomodate heterogeneous objects. type Finalization_Master is new Ada.Finalization.Limited_Controlled with private; -- A reference to a finalization master. Since this type may not be used -- to allocate objects, its storage size is zero. type Finalization_Master_Ptr is access all Finalization_Master; for Finalization_Master_Ptr'Storage_Size use 0; procedure Attach (N : not null FM_Node_Ptr; L : not null FM_Node_Ptr); -- Compiler interface, do not call from withing the run-time. Prepend a -- node to a specific finalization master. procedure Attach_Unprotected (N : not null FM_Node_Ptr; L : not null FM_Node_Ptr); -- Prepend a node to a specific finalization master procedure Delete_Finalize_Address_Unprotected (Obj : System.Address); -- Destroy the relation pair object - Finalize_Address from the internal -- hash table. procedure Detach (N : not null FM_Node_Ptr); -- Compiler interface, do not call from within the run-time. Remove a node -- from an arbitrary finalization master. procedure Detach_Unprotected (N : not null FM_Node_Ptr); -- Remove a node from an arbitrary finalization master overriding procedure Finalize (Master : in out Finalization_Master); -- Lock the master to prevent allocations during finalization. Iterate over -- the list of allocated controlled objects, finalizing each one by calling -- its specific Finalize_Address. In the end, deallocate the dummy head. function Finalize_Address (Master : Finalization_Master) return Finalize_Address_Ptr; -- Return a reference to the TSS primitive Finalize_Address associated with -- a master. function Finalize_Address_Unprotected (Obj : System.Address) return Finalize_Address_Ptr; -- Retrieve the Finalize_Address primitive associated with a particular -- object. function Finalization_Started (Master : Finalization_Master) return Boolean; -- Return the finalization status of a master function Header_Offset return System.Storage_Elements.Storage_Offset; -- Return the size of type FM_Node as Storage_Offset function Header_Size return System.Storage_Elements.Storage_Count; -- Return the size of type FM_Node as Storage_Count function Is_Homogeneous (Master : Finalization_Master) return Boolean; -- Return the behavior flag of a master function Objects (Master : Finalization_Master) return FM_Node_Ptr; -- Return the header of the doubly-linked list of controlled objects procedure Print_Master (Master : Finalization_Master); -- Debug routine, outputs the contents of a master procedure Set_Finalize_Address (Master : in out Finalization_Master; Fin_Addr_Ptr : Finalize_Address_Ptr); -- Compiler interface, do not call from within the run-time. Set the clean -- up routine of a finalization master procedure Set_Finalize_Address_Unprotected (Master : in out Finalization_Master; Fin_Addr_Ptr : Finalize_Address_Ptr); -- Set the clean up routine of a finalization master procedure Set_Heterogeneous_Finalize_Address_Unprotected (Obj : System.Address; Fin_Addr_Ptr : Finalize_Address_Ptr); -- Add a relation pair object - Finalize_Address to the internal hash -- table. This is done in the context of allocation on a heterogeneous -- finalization master where a single master services multiple anonymous -- access-to-controlled types. procedure Set_Is_Heterogeneous (Master : in out Finalization_Master); -- Mark the master as being a heterogeneous collection of objects private -- Heterogeneous collection type structure type FM_Node is record Prev : FM_Node_Ptr := null; Next : FM_Node_Ptr := null; end record; -- Finalization master type structure. A unique master is associated with -- each access-to-controlled or access-to-class-wide type. Masters also act -- as components of subpools. By default, a master contains objects of the -- same designated type but it may also accomodate heterogeneous objects. type Finalization_Master is new Ada.Finalization.Limited_Controlled with record Is_Homogeneous : Boolean := True; -- A flag which controls the behavior of the master. A value of False -- denotes a heterogeneous collection. Base_Pool : Any_Storage_Pool_Ptr := null; -- A reference to the pool which this finalization master services. This -- field is used in conjunction with the build-in-place machinery. Objects : aliased FM_Node; -- A doubly linked list which contains the headers of all controlled -- objects allocated in a [sub]pool. Finalize_Address : Finalize_Address_Ptr := null; -- A reference to the routine reponsible for object finalization. This -- is used only when the master is in homogeneous mode. Finalization_Started : Boolean := False; -- A flag used to detect allocations which occur during the finalization -- of a master. The allocations must raise Program_Error. This scenario -- may arise in a multitask environment. end record; -- Since RTSfind cannot contain names of the form RE_"+", the following -- routine serves as a wrapper around System.Storage_Elements."+". function Add_Offset_To_Address (Addr : System.Address; Offset : System.Storage_Elements.Storage_Offset) return System.Address; function Base_Pool (Master : Finalization_Master) return Any_Storage_Pool_Ptr; -- Return a reference to the underlying storage pool on which the master -- operates. overriding procedure Initialize (Master : in out Finalization_Master); -- Initialize the dummy head of a finalization master procedure Set_Base_Pool (Master : in out Finalization_Master; Pool_Ptr : Any_Storage_Pool_Ptr); -- Set the underlying pool of a finalization master end System.Finalization_Masters;
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