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578 | ------------------------------------------------------------------------------
-- --
-- GLADE COMPONENTS --
-- --
-- S Y S T E M . G A R L I C . T A B L E --
-- --
-- B o d y --
-- --
-- Copyright (C) 1996-2020 Free Software Foundation, Inc. --
-- --
-- GARLIC 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 2, or (at your option) any later ver- --
-- sion. GARLIC is distributed in the hope that it will be useful, but --
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABI- --
-- LITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for more details. You should have received a copy of the GNU --
-- General Public License distributed with GARLIC; see file COPYING. If --
-- not, write to the Free Software Foundation, 59 Temple Place - Suite 330, --
-- Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
------------------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
with System.Garlic.Types; use System.Garlic.Types;
with System.Garlic.Name_Table; use System.Garlic.Name_Table;
with System.Garlic.Soft_Links; use System.Garlic.Soft_Links;
with System.Garlic.Debug; use System.Garlic.Debug;
package body System.Garlic.Table is
Private_Debug_Key : constant Debug_Key :=
Debug_Initialize ("S_GARTAB", "(s-gartab): ");
procedure D
(Message : String;
Key : Debug_Key := Private_Debug_Key)
renames Print_Debug_Info;
pragma Unreferenced (D);
-------------
-- Complex --
-------------
package body Complex is
type Component_Table_Type is
array (Index_Type range <>) of Component_Type;
type Component_Table_Access is access Component_Table_Type;
Table : Component_Table_Access;
Min_Pos : constant Integer := Integer (First_Index);
Max_Pos : Integer := Min_Pos + Initial_Size - 1;
Last_Pos : Integer := Min_Pos - 1;
Min : constant Index_Type := Index_Type (Min_Pos);
Max : Index_Type := Index_Type (Max_Pos);
type Usage_Type is record
Name : Name_Id;
Free : Boolean;
end record;
Null_Usage : constant Usage_Type := (Null_Name, True);
type Usage_Table_Type is array (Index_Type range <>) of Usage_Type;
type Usage_Table_Access is access Usage_Table_Type;
Usage : Usage_Table_Access;
function Allocate return Index_Type;
-- Allocate a new component.
procedure Free is
new Ada.Unchecked_Deallocation
(Component_Table_Type, Component_Table_Access);
procedure Free is
new Ada.Unchecked_Deallocation
(Usage_Table_Type, Usage_Table_Access);
procedure Validate (N : Index_Type);
Mutex : Mutex_Access;
Watcher : Watcher_Access;
-- This lock is used to block tasks until the table is
-- modified. This uses special behaviour of Types.Mutex_Record.
-- Basically, Local_Mutex.Leave (Postponed) lets the run-time know
-- that the mutex has been postponed and that it should be resumed
-- when a Local_Mutex.Leave (Modified) occurs.
-- Most of these subprograms are abort deferred. At the beginning of
-- them, the code enter a critical section. At the end, it leaves
-- the critical section. To avoid a premature abortion in the middle
-- of the critical section, the code is protected against abortion.
--------------
-- Allocate --
--------------
function Allocate return Index_Type
is
Old_Max : Index_Type;
Old_Table : Component_Table_Access;
Old_Usage : Usage_Table_Access;
begin
-- Try to allocate a free slot
for Index in Min .. Max loop
if Usage (Index).Free then
Usage (Index).Free := False;
return Index;
end if;
end loop;
-- Allocate new table
Old_Max := Max;
Old_Table := Table;
Old_Usage := Usage;
Max_Pos := Max_Pos + Increment_Size;
Max := Index_Type (Max_Pos);
Table := new Component_Table_Type (Min .. Max);
Usage := new Usage_Table_Type (Min .. Max);
-- Copy old table in new table
Table (Min .. Old_Max) := Old_Table (Min .. Old_Max);
Usage (Min .. Old_Max) := Old_Usage (Min .. Old_Max);
-- Intialize incremented part of new table
Table (Old_Max + 1 .. Max) := (others => Null_Component);
Usage (Old_Max + 1 .. Max) := (others => Null_Usage);
-- Release unused memory
Free (Old_Table);
Free (Old_Usage);
Usage (Old_Max + 1).Free := False;
return Old_Max + 1;
end Allocate;
------------
-- Differ --
------------
procedure Differ (Version : Types.Version_Id) is
begin
Differ (Watcher, Version);
end Differ;
-----------
-- Enter --
-----------
procedure Enter is
begin
Enter (Mutex);
end Enter;
-------------------
-- Get_Component --
-------------------
function Get_Component (N : Index_Type) return Component_Type
is
Component : Component_Type;
begin
Enter_Critical_Section;
Validate (N);
Component := Table (N);
Leave_Critical_Section;
return Component;
end Get_Component;
---------------
-- Get_Index --
---------------
function Get_Index (S : String) return Index_Type
is
Index : Index_Type;
Name : Name_Id;
Info : Integer;
begin
Enter_Critical_Section;
Name := Get (S);
Info := Get_Info (Name);
if Info = 0 then
-- Info is a null index. Create new component and set its
-- index as name info.
Index := Allocate;
Table (Index) := Null_Component;
Usage (Index).Name := Name;
Set_Info (Name, Integer (Index));
else
Index := Index_Type (Info);
end if;
Leave_Critical_Section;
return Index;
end Get_Index;
--------------
-- Get_Name --
--------------
function Get_Name (N : Index_Type) return String
is
Name : Name_Id;
begin
Enter_Critical_Section;
if Max < N or else Usage (N).Free then
Name := Null_Name;
else
Name := Usage (N).Name;
end if;
Leave_Critical_Section;
return Get (Name);
end Get_Name;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
Create (Mutex);
Create (Watcher);
Table := new Component_Table_Type'(Min .. Max => Null_Component);
Usage := new Usage_Table_Type '(Min .. Max => Null_Usage);
end Initialize;
----------
-- Last --
----------
function Last return Index_Type is
begin
return Index_Type (Last_Pos);
end Last;
-----------
-- Leave --
-----------
procedure Leave (Version : out Version_Id) is
begin
Lookup (Watcher, Version);
Leave (Mutex);
end Leave;
-----------
-- Leave --
-----------
procedure Leave is
begin
Leave (Mutex);
end Leave;
-------------------
-- Set_Component --
-------------------
procedure Set_Component
(N : Index_Type;
C : Component_Type) is
begin
Enter_Critical_Section;
Validate (N);
Table (N) := C;
Update (Watcher);
Leave_Critical_Section;
end Set_Component;
--------------
-- Set_Name --
--------------
procedure Set_Name (N : Index_Type; S : String)
is
begin
Enter_Critical_Section;
Validate (N);
Usage (N).Name := Get (S);
Set_Info (Usage (N).Name, Integer (N));
Leave_Critical_Section;
end Set_Name;
------------
-- Update --
------------
procedure Update is
begin
Update (Watcher);
end Update;
--------------
-- Validate --
--------------
procedure Validate (N : Index_Type) is
Dummy : Index_Type;
pragma Unreferenced (Dummy);
begin
pragma Assert (Min <= N);
while N > Max loop
Dummy := Allocate;
end loop;
if Last_Pos < Integer (N) then
Last_Pos := Integer (N);
end if;
end Validate;
end Complex;
------------
-- Medium --
------------
package body Medium is
type Component_Table_Type is
array (Index_Type range <>) of Component_Type;
type Component_Table_Access is access Component_Table_Type;
Table : Component_Table_Access;
Min_Pos : constant Integer := Integer (First_Index);
Max_Pos : Integer := Min_Pos + Initial_Size - 1;
Last_Pos : Integer := Min_Pos - 1;
Min : constant Index_Type := Index_Type (Min_Pos);
Max : Index_Type := Index_Type (Max_Pos);
function Allocate return Index_Type;
-- Allocate a new component.
procedure Free is
new Ada.Unchecked_Deallocation
(Component_Table_Type, Component_Table_Access);
procedure Validate (N : Index_Type);
Mutex : Mutex_Access;
Watcher : Watcher_Access;
-- This lock is used to block tasks until the table is
-- modified. This uses special behaviour of Types.Mutex_Record.
-- Basically, Local_Mutex.Leave (Postponed) lets the run-time know
-- that the mutex has been postponed and that it should be resumed
-- when a Local_Mutex.Leave (Modified) occurs.
-- Most of these subprograms are abort deferred. At the beginning of
-- them, the code enter a critical section. At the end, it leaves
-- the critical section. To avoid a premature abortion in the middle
-- of the critical section, the code is protected against abortion.
--------------
-- Allocate --
--------------
function Allocate return Index_Type
is
Old_Max : Index_Type;
Old_Table : Component_Table_Access;
begin
-- Allocate new table
Old_Max := Max;
Old_Table := Table;
Max_Pos := Max_Pos + Increment_Size;
Max := Index_Type (Max_Pos);
Table := new Component_Table_Type (Min .. Max);
-- Copy old table in new table
Table (Min .. Old_Max) := Old_Table (Min .. Old_Max);
-- Intialize incremented part of new table
Table (Old_Max + 1 .. Max) := (others => Null_Component);
-- Release unused memory
Free (Old_Table);
return Old_Max + 1;
end Allocate;
------------
-- Differ --
------------
procedure Differ (Version : Types.Version_Id) is
begin
Differ (Watcher, Version);
end Differ;
-----------
-- Enter --
-----------
procedure Enter is
begin
Enter (Mutex);
end Enter;
-------------------
-- Get_Component --
-------------------
function Get_Component (N : Index_Type) return Component_Type
is
Component : Component_Type;
begin
Enter_Critical_Section;
Validate (N);
Component := Table (N);
Leave_Critical_Section;
return Component;
end Get_Component;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
Create (Mutex);
Create (Watcher);
Table := new Component_Table_Type'(Min .. Max => Null_Component);
end Initialize;
----------
-- Last --
----------
function Last return Index_Type is
begin
return Index_Type (Last_Pos);
end Last;
-----------
-- Leave --
-----------
procedure Leave (Version : out Version_Id) is
begin
Lookup (Watcher, Version);
Leave (Mutex);
end Leave;
-----------
-- Leave --
-----------
procedure Leave is
begin
Leave (Mutex);
end Leave;
-------------------
-- Set_Component --
-------------------
procedure Set_Component
(N : Index_Type;
C : Component_Type) is
begin
Enter_Critical_Section;
Validate (N);
Table (N) := C;
Update (Watcher);
Leave_Critical_Section;
end Set_Component;
------------
-- Update --
------------
procedure Update is
begin
Update (Watcher);
end Update;
--------------
-- Validate --
--------------
procedure Validate (N : Index_Type) is
Dummy : Index_Type;
pragma Unreferenced (Dummy);
begin
pragma Assert (Min <= N);
while N > Max loop
Dummy := Allocate;
end loop;
if Last_Pos < Integer (N) then
Last_Pos := Integer (N);
end if;
end Validate;
end Medium;
------------
-- Simple --
------------
package body Simple is
Min_Pos : constant Integer := Integer (First_Index);
Max_Pos : Integer := Min_Pos + Initial_Size - 1;
Min : constant Index_Type := Index_Type (Min_Pos);
Max : Index_Type := Index_Type (Max_Pos);
Last : Index_Type := Index_Type (Min_Pos - 1);
procedure Free is
new Ada.Unchecked_Deallocation
(Component_Table_Type, Component_Table_Access);
--------------
-- Allocate --
--------------
function Allocate return Index_Type
is
Old : Component_Table_Access;
begin
if Last = Max then
Max_Pos := Max_Pos + Increment_Size;
Max := Index_Type (Max_Pos);
Old := Table;
Table := new Component_Table_Type (Min .. Max);
Table (Min .. Last) := Old (Min .. Last);
Table (Last + 1 .. Max) := (others => Null_Component);
Free (Old);
end if;
Last := Last + 1;
return Last;
end Allocate;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
Table := new Component_Table_Type'(Min .. Max => Null_Component);
end Initialize;
end Simple;
end System.Garlic.Table;
|