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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . D Y N A M I C _ H T A B L E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2006, AdaCore --
-- --
-- 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body GNAT.Dynamic_HTables is
-------------------
-- Static_HTable --
-------------------
package body Static_HTable is
type Table_Type is array (Header_Num) of Elmt_Ptr;
type Instance_Data is record
Table : Table_Type;
Iterator_Index : Header_Num;
Iterator_Ptr : Elmt_Ptr;
Iterator_Started : Boolean := False;
end record;
function Get_Non_Null (T : Instance) return Elmt_Ptr;
-- Returns Null_Ptr if Iterator_Started is False or if the Table is
-- empty. Returns Iterator_Ptr if non null, or the next non null
-- element in table if any.
---------
-- Get --
---------
function Get (T : Instance; K : Key) return Elmt_Ptr is
Elmt : Elmt_Ptr;
begin
if T = null then
return Null_Ptr;
end if;
Elmt := T.Table (Hash (K));
loop
if Elmt = Null_Ptr then
return Null_Ptr;
elsif Equal (Get_Key (Elmt), K) then
return Elmt;
else
Elmt := Next (Elmt);
end if;
end loop;
end Get;
---------------
-- Get_First --
---------------
function Get_First (T : Instance) return Elmt_Ptr is
begin
if T = null then
return Null_Ptr;
end if;
T.Iterator_Started := True;
T.Iterator_Index := T.Table'First;
T.Iterator_Ptr := T.Table (T.Iterator_Index);
return Get_Non_Null (T);
end Get_First;
--------------
-- Get_Next --
--------------
function Get_Next (T : Instance) return Elmt_Ptr is
begin
if T = null or else not T.Iterator_Started then
return Null_Ptr;
end if;
T.Iterator_Ptr := Next (T.Iterator_Ptr);
return Get_Non_Null (T);
end Get_Next;
------------------
-- Get_Non_Null --
------------------
function Get_Non_Null (T : Instance) return Elmt_Ptr is
begin
if T = null then
return Null_Ptr;
end if;
while T.Iterator_Ptr = Null_Ptr loop
if T.Iterator_Index = T.Table'Last then
T.Iterator_Started := False;
return Null_Ptr;
end if;
T.Iterator_Index := T.Iterator_Index + 1;
T.Iterator_Ptr := T.Table (T.Iterator_Index);
end loop;
return T.Iterator_Ptr;
end Get_Non_Null;
------------
-- Remove --
------------
procedure Remove (T : Instance; K : Key) is
Index : constant Header_Num := Hash (K);
Elmt : Elmt_Ptr;
Next_Elmt : Elmt_Ptr;
begin
if T = null then
return;
end if;
Elmt := T.Table (Index);
if Elmt = Null_Ptr then
return;
elsif Equal (Get_Key (Elmt), K) then
T.Table (Index) := Next (Elmt);
else
loop
Next_Elmt := Next (Elmt);
if Next_Elmt = Null_Ptr then
return;
elsif Equal (Get_Key (Next_Elmt), K) then
Set_Next (Elmt, Next (Next_Elmt));
return;
else
Elmt := Next_Elmt;
end if;
end loop;
end if;
end Remove;
-----------
-- Reset --
-----------
procedure Reset (T : in out Instance) is
procedure Free is
new Ada.Unchecked_Deallocation (Instance_Data, Instance);
begin
if T = null then
return;
end if;
for J in T.Table'Range loop
T.Table (J) := Null_Ptr;
end loop;
Free (T);
end Reset;
---------
-- Set --
---------
procedure Set (T : in out Instance; E : Elmt_Ptr) is
Index : Header_Num;
begin
if T = null then
T := new Instance_Data;
end if;
Index := Hash (Get_Key (E));
Set_Next (E, T.Table (Index));
T.Table (Index) := E;
end Set;
end Static_HTable;
-------------------
-- Simple_HTable --
-------------------
package body Simple_HTable is
---------
-- Get --
---------
function Get (T : Instance; K : Key) return Element is
Tmp : Elmt_Ptr;
begin
if T = Nil then
return No_Element;
end if;
Tmp := Tab.Get (Tab.Instance (T), K);
if Tmp = null then
return No_Element;
else
return Tmp.E;
end if;
end Get;
---------------
-- Get_First --
---------------
function Get_First (T : Instance) return Element is
Tmp : constant Elmt_Ptr := Tab.Get_First (Tab.Instance (T));
begin
if Tmp = null then
return No_Element;
else
return Tmp.E;
end if;
end Get_First;
-------------
-- Get_Key --
-------------
function Get_Key (E : Elmt_Ptr) return Key is
begin
return E.K;
end Get_Key;
--------------
-- Get_Next --
--------------
function Get_Next (T : Instance) return Element is
Tmp : constant Elmt_Ptr := Tab.Get_Next (Tab.Instance (T));
begin
if Tmp = null then
return No_Element;
else
return Tmp.E;
end if;
end Get_Next;
----------
-- Next --
----------
function Next (E : Elmt_Ptr) return Elmt_Ptr is
begin
return E.Next;
end Next;
------------
-- Remove --
------------
procedure Remove (T : Instance; K : Key) is
Tmp : Elmt_Ptr;
begin
Tmp := Tab.Get (Tab.Instance (T), K);
if Tmp /= null then
Tab.Remove (Tab.Instance (T), K);
Free (Tmp);
end if;
end Remove;
-----------
-- Reset --
-----------
procedure Reset (T : in out Instance) is
E1, E2 : Elmt_Ptr;
begin
E1 := Tab.Get_First (Tab.Instance (T));
while E1 /= null loop
E2 := Tab.Get_Next (Tab.Instance (T));
Free (E1);
E1 := E2;
end loop;
Tab.Reset (Tab.Instance (T));
end Reset;
---------
-- Set --
---------
procedure Set (T : in out Instance; K : Key; E : Element) is
Tmp : constant Elmt_Ptr := Tab.Get (Tab.Instance (T), K);
begin
if Tmp = null then
Tab.Set (Tab.Instance (T), new Element_Wrapper'(K, E, null));
else
Tmp.E := E;
end if;
end Set;
--------------
-- Set_Next --
--------------
procedure Set_Next (E : Elmt_Ptr; Next : Elmt_Ptr) is
begin
E.Next := Next;
end Set_Next;
end Simple_HTable;
end GNAT.Dynamic_HTables;
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